Merge pull request 'mesh-issues: a resolved issue ends its fix-stuck warning, and a closed issue's fix is never said stuck (hq issue 547)' (#239) from fix/547-resolved-ends-stuck into main

The shared-server check refused an adopted account for its own alias, and
counted Owl's, local folders' and feeds' identities as users of the default
server, though they never send by SMTP. The controller now judges an
upstream pin's host like any name, so each pin declares its vendor.

modules/artifact-store-tools/README.md

@@ -1,7 +1,8 @@
 # artifact-store-tools
 
 Tools that say what the mesh's artifact store holds, and what the controller's records say of it
-(novox/hq ADR 0251 §1–3, to-be 51). It declares no resources and changes nothing on its machine.
+(novox/hq ADR 0251 §1–3, to-be 51). It changes nothing on its machine; its only resources are its state
+directory and the file the mesh writes there from its setting `older-store-names`.
 
 ## Why a module beside the store
 
@@ -18,7 +19,7 @@ on that machine.
 |---|---|---|
 | `artifact_store_repositories` | r | every repository: tags and what each names, how many manifests (tagged or not), size |
 | `artifact_store_usage` | r | the store's size, the largest repositories, bytes shared between repositories, bytes no manifest marks (what the nightly collector frees next) |
-| `artifact_store_references` | r | what the controller's records say of each manifest, counted and sized by state and repository; each manifest listed when one repository is asked; what the records keep that the store does not hold |
+| `artifact_store_references` | r | what the controller's records and the catalogue's definitions say of each manifest, counted and sized by state and repository; each manifest listed when one repository is asked; what the records keep that the store does not hold |
 | `artifact_store_collect` | a | a dry run unless `dry_run` is false: what the controller would let go of, and the bytes the nightly collector would free then and now. A real run needs `why` and asks the controller's `collect` |
 
 ### How the store is read
@@ -43,6 +44,7 @@ it lists. The store's collector removes every blob no manifest marks, so these n
 | state | what | removable |
 |---|---|---|
 | `kept` | a definition names it, or one of the five most recent builds of a module the mesh holds; `why` says which | no |
+| `named-by-a-definition` | no record names it, and a definition in the catalogue pins it by digest, under the store's current name or an older one; `why` names the module (hq issue 323) | no |
 | `holder-of-kept-archive` | the manifest that keeps a kept archive's blob (hq issue 253) | no |
 | `eligible` | the mesh made it and keeps it for no reason | through the controller's `collect` |
 | `holder-of-eligible-archive` | the manifest that keeps an eligible archive's blob | with its archive |
@@ -56,6 +58,20 @@ its own right; the controller lets an index go with the platform manifests only
 counted as the index's. Two indexes naming one platform give it the more keeping state. An index no
 record names leaves its platform manifests unrecorded with it.
 
+**What the definitions pin** (hq issue 323). A definition may pin an image of the store the mesh did not
+make: pushed before the mesh built it, and pinned under the store's current name or a name it had before.
+No record of the controller names it, yet a machine runs it, so `artifact_store_references` reads every
+definition the catalogue holds (`mesh-catalog.catalog_modules`, then `catalog_module` for each, eight at
+a time and within twenty seconds) and finds every `<name>/<repository>@sha256:…` in any of its strings,
+under each of the store's names: `artifact-store://`, the store's address as the controller answers it,
+and the names it had before. Those are the mesh's setting `older-store-names` (space-separated, `none` by
+default, set with the controller's `settings`), which the mesh writes to the module's `store-names` file: a
+catalogue names no installation. When they cannot be read, the answer's first line says so. A manifest no record
+names that a definition pins is `named-by-a-definition`; one the records name keeps the records' state. A
+definition read at its commit is kept, so the next call asks only for the list. Definitions that could
+not be read are listed under `definitions.unread`, and the answer's first line says that what they pin
+reads as unrecorded until they are.
+
 **Unrecorded copies of upstream images** are listed in `unrecorded_mirrors`: each manifest at the top of
 a repository only the build's mirror writes (`upstream/<host>/<path>`, or a module's `<module>/on-<argument>`
 from before hq ADR 0257) that no record names, with what it and its platforms mark alone. They are the
@@ -88,6 +104,8 @@ with slashes, a cut listing refused), manifests read with one absent or unreadab
 digest never becoming a path outside the blobs, the mark (an index, a shared blob, a blob nothing marks),
 every state, what the records keep that the store lacks, bytes freed counting a blob shared with a kept
 manifest as kept, a dry run never confirming, a real run without `why` refused before anything is asked,
-the fall-back when the references let go of cannot be carried, escalation through `sudo -n`, and that the
-tools served are exactly the manifest's `tools` and its `invokes` exactly the two controller verbs.
+the fall-back when the references let go of cannot be carried, a manifest a definition pins under the
+store's current or an older name, a definition not read said first, escalation through `sudo -n`, and that the
+tools served are exactly the manifest's `tools` and its `invokes` exactly the two controller verbs and the
+catalogue's two tools.
 Any command other than the two read-only scripts fails the test.

modules/artifact-store-tools/cmd/artifact-store-tools/classify.go

@@ -7,12 +7,15 @@ import (
 
 // The states a manifest the store holds can be in, as the records see it (novox/hq to-be 51).
 const (
-	StateKept              = "kept"
-	StateHolderKept        = "holder-of-kept-archive"
-	StateEligible          = "eligible"
-	StateHolderEligible    = "holder-of-eligible-archive"
-	StateCollectedPresent  = "let-go-yet-present"
-	StateNamedDocument     = "named-document"
+	StateKept             = "kept"
+	StateHolderKept       = "holder-of-kept-archive"
+	StateEligible         = "eligible"
+	StateHolderEligible   = "holder-of-eligible-archive"
+	StateCollectedPresent = "let-go-yet-present"
+	StateNamedDocument    = "named-document"
+	// StateNamedByDefinition is a manifest no record names that a definition pins by digest, under the
+	// store's current name or an older one (novox/hq issue 323): a machine may run it, so it is kept.
+	StateNamedByDefinition = "named-by-a-definition"
 	StateUnrecorded        = "unrecorded"
 	collectionRemovesThese = "eligible and holder-of-eligible-archive, through the controller's collect; nothing else"
 )
@@ -45,8 +48,8 @@ var mirrorRepository = regexp.MustCompile(`^(upstream/[a-z0-9][a-z0-9._/-]*|[a-z
 // keeping orders the states a platform manifest may take from the indexes naming it: the most keeping
 // wins, so a platform two indexes name is as kept as the more kept of them.
 var keeping = map[string]int{
-	StateKept: 0, StateNamedDocument: 1, StateHolderKept: 2, StateEligible: 3, StateHolderEligible: 4,
-	StateCollectedPresent: 5,
+	StateKept: 0, StateNamedByDefinition: 1, StateNamedDocument: 2, StateHolderKept: 3, StateEligible: 4,
+	StateHolderEligible: 5, StateCollectedPresent: 6,
 }
 
 // recordIndex finds a record by repository and digest.
@@ -64,8 +67,9 @@ func indexRecords(r *Records) recordIndex {
 	return idx
 }
 
-// Classify gives every manifest the store holds one state.
-func Classify(v *View, recs *Records) []Entry {
+// Classify gives every manifest the store holds one state. A manifest no record names that a definition
+// pins is named by a definition; defs may be nil, when the definitions were not read.
+func Classify(v *View, recs *Records, defs *Definitions) []Entry {
 	idx := indexRecords(recs)
 	var out []Entry
 	for _, name := range v.L.RepoNames() {
@@ -99,6 +103,12 @@ func Classify(v *View, recs *Records) []Entry {
 					e.State = StateNamedDocument
 				}
 			}
+			if e.State == StateUnrecorded && defs != nil {
+				for _, p := range defs.Pins[Key(name, d)] {
+					e.State = StateNamedByDefinition
+					e.Why = append(e.Why, p.why())
+				}
+			}
 			out = append(out, e)
 		}
 	}

modules/artifact-store-tools/cmd/artifact-store-tools/definitions.go

@@ -0,0 +1,343 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"regexp"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+)
+
+// What the definitions pin in the store (novox/hq issue 323). A definition may pin an image of the store by
+// digest that the mesh did not make: one pushed before the mesh built it, pinned under the store's current
+// name or under a name the store had before. No record of the controller names such a manifest, and yet a
+// machine runs it, so it is said to be named by a definition and never unrecorded.
+
+// NamesFileEnv names the file the mesh writes from the setting older-store-names: a line `older=` with the
+// names the store had before, as a definition may still write them — host names, or host:port, separated by
+// spaces — or `none`. A catalogue names no installation, so the names are the mesh's setting, not the
+// manifest's.
+const NamesFileEnv = "MESH_ARTIFACT_STORE_NAMES_FILE"
+
+// CatalogueModules and CatalogueModule are the catalogue's tools these definitions are read through.
+const (
+	CatalogueModules = "mesh-catalog.catalog_modules"
+	CatalogueModule  = "mesh-catalog.catalog_module"
+)
+
+// DefinitionsTimeout bounds reading every definition, below the runtime's thirty-second call limit; what
+// was read is kept, so a call that runs out reads only the rest the next time.
+const DefinitionsTimeout = 20 * time.Second
+
+// definitionReaders is how many definitions are asked at once.
+const definitionReaders = 8
+
+// StoreNames are the names a definition may pin an image of the store under: the scheme the mesh writes
+// (artifact-store://), the store's address now, and the names it had before.
+type StoreNames struct {
+	Current []string
+	Older   []string
+}
+
+// NamesOf is the store's names: its address as the controller answers it, and the older ones given.
+func NamesOf(address, older string) StoreNames {
+	n := StoreNames{Current: []string{"artifact-store://"}}
+	if a := strings.Trim(strings.TrimSpace(address), "/"); a != "" {
+		n.Current = append(n.Current, a+"/")
+	}
+	for _, o := range strings.FieldsFunc(older, func(r rune) bool { return r == ',' || r == ' ' || r == '\n' || r == '\t' }) {
+		if o = strings.Trim(o, "/"); o != "" && o != "none" {
+			n.Older = append(n.Older, o+"/")
+		}
+	}
+	return n
+}
+
+// OlderNames reads the older names from the file the mesh writes, and says why when it cannot.
+func OlderNames() (string, string) {
+	path := os.Getenv(NamesFileEnv)
+	if path == "" {
+		return "", NamesFileEnv + " is not set, so no older name of the store was read"
+	}
+	raw, err := os.ReadFile(path)
+	if err != nil {
+		return "", "the store's older names could not be read: " + err.Error()
+	}
+	for _, line := range strings.Split(string(raw), "\n") {
+		if v, ok := strings.CutPrefix(strings.TrimSpace(line), "older="); ok {
+			return v, ""
+		}
+	}
+	return "", path + " holds no line older=, so no older name of the store was read"
+}
+
+// Pin is one definition pinning a manifest of the store by digest.
+type Pin struct {
+	Module string `json:"module"`
+	// Name is the store's name it is pinned under, as written: "artifact-store://", an address, or an older name.
+	Name  string `json:"name"`
+	Older bool   `json:"older,omitempty"`
+}
+
+// pinned is one pin found in a manifest: where in the store, and under which name.
+type pinned struct {
+	Repository, Digest, Name string
+	Older                    bool
+}
+
+var pinShapes sync.Map // name -> *regexp.Regexp
+
+// pinShape is `<name><repository>@sha256:<hex>`, the name standing on its own: not the tail of a longer host.
+func pinShape(name string) *regexp.Regexp {
+	if re, ok := pinShapes.Load(name); ok {
+		return re.(*regexp.Regexp)
+	}
+	re := regexp.MustCompile(`(?:^|[^A-Za-z0-9.-])` + regexp.QuoteMeta(name) +
+		`([a-z0-9][a-z0-9._/-]*)@(sha256:[0-9a-f]{64})`)
+	pinShapes.Store(name, re)
+	return re
+}
+
+// PinsIn finds every image of the store a manifest pins by digest, in any string it holds: a resource's
+// image, a build's base, a file's content.
+func PinsIn(manifest json.RawMessage, names StoreNames) []pinned {
+	var doc any
+	if json.Unmarshal(manifest, &doc) != nil {
+		return nil
+	}
+	seen := map[string]bool{}
+	var out []pinned
+	var walk func(any)
+	walk = func(x any) {
+		switch v := x.(type) {
+		case map[string]any:
+			for _, e := range v {
+				walk(e)
+			}
+		case []any:
+			for _, e := range v {
+				walk(e)
+			}
+		case string:
+			for _, group := range []struct {
+				names []string
+				older bool
+			}{{names.Current, false}, {names.Older, true}} {
+				for _, name := range group.names {
+					for _, m := range pinShape(name).FindAllStringSubmatch(v, -1) {
+						p := pinned{Repository: strings.Trim(m[1], "/"), Digest: m[2], Name: name, Older: group.older}
+						if k := p.Repository + "@" + p.Digest + " " + p.Name; !seen[k] {
+							seen[k] = true
+							out = append(out, p)
+						}
+					}
+				}
+			}
+		}
+	}
+	walk(doc)
+	return out
+}
+
+// Definitions is what the catalogue's definitions pin in the store, and what of them could not be read.
+type Definitions struct {
+	// Pins are by Key(repository, digest).
+	Pins map[string][]Pin
+	// Read is how many definitions were read; Unread says, per module, why its definition was not.
+	Read   int
+	Unread map[string]string
+	// NotAsked says why the catalogue could not be asked at all, when it could not.
+	NotAsked string
+	// NamesNotRead says why the store's older names could not be read, when they could not.
+	NamesNotRead string
+	Names        StoreNames
+}
+
+// Catalogue reads the definitions through the catalogue's tools, and keeps each definition it read by its
+// module and commit, which never change together.
+type Catalogue struct {
+	Ask Asking
+
+	mu   sync.Mutex
+	kept map[string][]pinned // "<module>@<commit>|<names>" -> its pins
+}
+
+type catalogueEntry struct {
+	Module string `json:"module"`
+	Commit string `json:"commit"`
+}
+
+// Read asks the catalogue for every module and reads each definition, bounded by DefinitionsTimeout.
+func (c *Catalogue) Read(ctx context.Context, names StoreNames) *Definitions {
+	defs := &Definitions{Pins: map[string][]Pin{}, Unread: map[string]string{}, Names: names}
+	if c == nil || c.Ask == nil {
+		defs.NotAsked = "this bundle has no way to ask the catalogue"
+		return defs
+	}
+	raw, err := c.Ask(CatalogueModules, map[string]any{})
+	if err != nil {
+		defs.NotAsked = "the catalogue's modules could not be asked: " + err.Error()
+		return defs
+	}
+	answer, output, ok := answerOf(raw)
+	if !ok {
+		defs.NotAsked = "the catalogue refused its modules: " + lastLine(output)
+		return defs
+	}
+	var list struct {
+		Modules []catalogueEntry `json:"modules"`
+		Error   string           `json:"error"`
+	}
+	if err := json.Unmarshal(answer, &list); err != nil || list.Error != "" || list.Modules == nil {
+		defs.NotAsked = "the catalogue's modules answer is not readable: " + firstOf(list.Error, errText(err), lastLine(output))
+		return defs
+	}
+	c.mu.Lock()
+	if c.kept == nil {
+		c.kept = map[string][]pinned{}
+	}
+	c.mu.Unlock()
+	nameKey := strings.Join(names.Current, ",") + ";" + strings.Join(names.Older, ",")
+
+	ctx, cancel := context.WithTimeout(ctx, DefinitionsTimeout)
+	defer cancel()
+	type result struct {
+		module string
+		pins   []pinned
+		why    string
+	}
+	results := make(chan result, len(list.Modules))
+	work := make(chan catalogueEntry)
+	var wg sync.WaitGroup
+	for i := 0; i < definitionReaders; i++ {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			for m := range work {
+				pins, why := c.definition(m, names, nameKey)
+				results <- result{m.Module, pins, why}
+			}
+		}()
+	}
+	go func() {
+		defer close(work)
+		for _, m := range list.Modules {
+			select {
+			case work <- m:
+			case <-ctx.Done():
+				return
+			}
+		}
+	}()
+	go func() { wg.Wait(); close(results) }()
+
+	got := map[string]bool{}
+collect:
+	for {
+		select {
+		case r, open := <-results:
+			if !open {
+				break collect
+			}
+			got[r.module] = true
+			if r.why != "" {
+				defs.Unread[r.module] = r.why
+				continue
+			}
+			defs.Read++
+			for _, p := range r.pins {
+				k := Key(p.Repository, p.Digest)
+				defs.Pins[k] = append(defs.Pins[k], Pin{Module: r.module, Name: p.Name, Older: p.Older})
+			}
+		case <-ctx.Done():
+			break collect
+		}
+	}
+	for _, m := range list.Modules {
+		if !got[m.Module] {
+			defs.Unread[m.Module] = fmt.Sprintf("not read within %d s", int(DefinitionsTimeout/time.Second))
+		}
+	}
+	for k := range defs.Pins {
+		sort.Slice(defs.Pins[k], func(i, j int) bool { return defs.Pins[k][i].Module < defs.Pins[k][j].Module })
+	}
+	return defs
+}
+
+// definition reads one module's definition, or answers it from what was read before.
+func (c *Catalogue) definition(m catalogueEntry, names StoreNames, nameKey string) ([]pinned, string) {
+	key := m.Module + "@" + m.Commit + "|" + nameKey
+	if m.Commit != "" {
+		c.mu.Lock()
+		pins, had := c.kept[key]
+		c.mu.Unlock()
+		if had {
+			return pins, ""
+		}
+	}
+	args := map[string]any{"module": m.Module}
+	if m.Commit != "" {
+		args["commit"] = m.Commit
+	}
+	raw, err := c.Ask(CatalogueModule, args)
+	if err != nil {
+		return nil, "could not be asked: " + err.Error()
+	}
+	answer, output, ok := answerOf(raw)
+	if !ok {
+		return nil, "refused: " + lastLine(output)
+	}
+	var one struct {
+		Module *struct {
+			Manifest json.RawMessage `json:"manifest"`
+		} `json:"module"`
+		Error string `json:"error"`
+	}
+	if err := json.Unmarshal(answer, &one); err != nil || one.Error != "" || one.Module == nil || len(one.Module.Manifest) == 0 {
+		return nil, "not readable: " + firstOf(one.Error, errText(err), "no manifest in the answer")
+	}
+	pins := PinsIn(one.Module.Manifest, names)
+	if m.Commit != "" {
+		c.mu.Lock()
+		c.kept[key] = pins
+		c.mu.Unlock()
+	}
+	return pins, ""
+}
+
+// why says which definitions name a manifest, and under which of the store's names.
+func (p Pin) why() string {
+	if p.Older {
+		return fmt.Sprintf("a definition names it: %s, under %s, an older name of the store", p.Module, shownName(p.Name))
+	}
+	return "a definition names it: " + p.Module
+}
+
+func firstOf(s ...string) string {
+	for _, x := range s {
+		if strings.TrimSpace(x) != "" {
+			return x
+		}
+	}
+	return ""
+}
+
+func errText(err error) string {
+	if err == nil {
+		return ""
+	}
+	return err.Error()
+}
+
+// shownName is a name of the store as a person reads it: a host without the slash a pin puts after it, the
+// scheme as written.
+func shownName(name string) string {
+	if strings.HasSuffix(name, "://") {
+		return name
+	}
+	return strings.TrimSuffix(name, "/")
+}

modules/artifact-store-tools/cmd/artifact-store-tools/definitions_test.go

@@ -0,0 +1,259 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"reflect"
+	"strings"
+	"testing"
+)
+
+// A definition may pin an image of the store the mesh did not make, under a name the store had before
+// (novox/hq issue 323): three apps the anchor runs are pinned so. No record names them; a definition does.
+
+const oldName = "registry-api.example.org"
+
+// container is a definition whose one container runs image.
+func container(image string) string {
+	return fmt.Sprintf(`{"module":"x","resources":[{"id":"server","type":"container","image":%q}]}`, image)
+}
+
+func TestAnImageADefinitionPinsUnderAnOlderNameOfTheStoreIsNamedByADefinition(t *testing.T) {
+	v := view(t, world())
+	names := NamesOf("store:5000", oldName)
+	defs := &Definitions{Pins: map[string][]Pin{}}
+	for module, manifest := range map[string]string{
+		// m-stranger: no record names it; the invoicing app pins it under the store's older name.
+		"invoicing": container(oldName + "/app/server@" + d("m-stranger")),
+		// m-old: the records say eligible; a definition pinning it does not change what the records say.
+		"website": container("store:5000/app/server@" + d("m-old")),
+	} {
+		for _, p := range PinsIn(json.RawMessage(manifest), names) {
+			defs.Pins[Key(p.Repository, p.Digest)] = append(defs.Pins[Key(p.Repository, p.Digest)], Pin{Module: module, Name: p.Name, Older: p.Older})
+		}
+	}
+	got := stateByName(Classify(v, withFill(records()), defs))
+	stranger := got["app/server "+d("m-stranger")]
+	if stranger.State != StateNamedByDefinition {
+		t.Fatalf("a manifest a definition pins under an older name reads %q, want %q", stranger.State, StateNamedByDefinition)
+	}
+	if want := []string{"a definition names it: invoicing, under " + oldName + ", an older name of the store"}; !reflect.DeepEqual(stranger.Why, want) {
+		t.Errorf("why %q, want %q", stranger.Why, want)
+	}
+	if s := got["app/server "+d("m-old")].State; s != StateEligible {
+		t.Errorf("a recorded manifest a definition pins reads %q: the records decide what the mesh made", s)
+	}
+	// Without the definitions it is what it was: unrecorded.
+	if s := stateByName(Classify(v, withFill(records()), nil))["app/server "+d("m-stranger")].State; s != StateUnrecorded {
+		t.Errorf("without definitions %q", s)
+	}
+}
+
+func TestPinsAreFoundInEveryStringAndOnlyUnderTheStoresNames(t *testing.T) {
+	names := NamesOf("store:5000", oldName+", older.example/")
+	manifest := `{"resources":[
+		{"type":"container","image":"` + oldName + `/team/www@` + d("www") + `"},
+		{"type":"file","content":"IMAGE=older.example/team/tool@` + d("tool") + `\n"},
+		{"type":"container","image":"artifact-store://mod/art@` + d("built") + `"},
+		{"type":"container","image":"store:5000/mod/art@` + d("addressed") + `"},
+		{"type":"container","image":"not` + oldName + `/team/www@` + d("lookalike") + `"},
+		{"type":"container","image":"docker.io/library/nginx@` + d("upstream") + `"},
+		{"type":"container","image":"` + oldName + `/team/www:latest"}],
+		"build":{"on":{"base":"` + oldName + `/team/www@` + d("www") + `"}}}`
+	var got []string
+	for _, p := range PinsIn(json.RawMessage(manifest), names) {
+		got = append(got, fmt.Sprintf("%s@%s %s %v", p.Repository, p.Digest, p.Name, p.Older))
+	}
+	want := map[string]bool{
+		"team/www@" + d("www") + " " + oldName + "/ true":    true,
+		"team/tool@" + d("tool") + " older.example/ true":    true,
+		"mod/art@" + d("built") + " artifact-store:// false": true,
+		"mod/art@" + d("addressed") + " store:5000/ false":   true,
+	}
+	if len(got) != len(want) {
+		t.Fatalf("found %d pins, want %d (one per image and name; not a longer host's tail, not another registry, not a tag): %v", len(got), len(want), got)
+	}
+	for _, g := range got {
+		if !want[g] {
+			t.Errorf("found %s", g)
+		}
+	}
+}
+
+func TestAPlatformTakesTheStateOfAnIndexADefinitionNames(t *testing.T) {
+	v := mirrorWorld()
+	defs := &Definitions{Pins: map[string][]Pin{
+		Key("route-proxy/on-go_base", d("i-pre")): {{Module: "route-proxy", Name: oldName + "/", Older: true}},
+	}}
+	got := stateByName(Classify(v, withFill(mirrorRecords()), defs))
+	for _, name := range []string{"i-pre", "p-pre"} {
+		if s := got["route-proxy/on-go_base "+d(name)].State; s != StateNamedByDefinition {
+			t.Errorf("%s reads %q, want %q", name, s, StateNamedByDefinition)
+		}
+	}
+	if e := got["route-proxy/on-go_base "+d("p-pre")]; e.Index != d("i-pre") {
+		t.Errorf("p-pre takes its state from %q", e.Index)
+	}
+	if s := got["route-proxy/on-go_base "+d("p-lost")].State; s != StateUnrecorded {
+		t.Errorf("a platform nothing names reads %q", s)
+	}
+	for _, um := range UnrecordedMirrors(v, Classify(v, withFill(mirrorRecords()), defs)) {
+		if strings.Contains(um.Reference, hexOf(d("i-pre"))) {
+			t.Errorf("a copy a definition names is offered to the mirrors verb: %v", um)
+		}
+	}
+}
+
+// olderNames writes the file the mesh writes from the setting older-store-names.
+func olderNames(t *testing.T, names string) {
+	t.Helper()
+	path := filepath.Join(t.TempDir(), "store-names")
+	if err := os.WriteFile(path, []byte("# written by the mesh\nolder="+names+"\n"), 0o600); err != nil {
+		t.Fatal(err)
+	}
+	t.Setenv(NamesFileEnv, path)
+}
+
+func TestTheOlderNamesAreReadFromTheFileTheMeshWrites(t *testing.T) {
+	olderNames(t, oldName+" older.example")
+	got, why := OlderNames()
+	if why != "" || !reflect.DeepEqual(NamesOf("", got).Older, []string{oldName + "/", "older.example/"}) {
+		t.Errorf("read %q (%s)", got, why)
+	}
+	olderNames(t, "none")
+	if got, why := OlderNames(); why != "" || len(NamesOf("", got).Older) != 0 {
+		t.Errorf("none read as %q (%s)", got, why)
+	}
+	t.Setenv(NamesFileEnv, filepath.Join(t.TempDir(), "absent"))
+	if _, why := OlderNames(); why == "" {
+		t.Error("an absent file was not said")
+	}
+}
+
+func TestOlderNamesNotReadAreSaidFirst(t *testing.T) {
+	t.Setenv(NamesFileEnv, "")
+	a := &asked{definitions: map[string]string{"invoicing": container(oldName + "/app/server@" + d("m-stranger"))}}
+	out, err := references(t, a)(map[string]any{"repository": "app/server"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m := out.(map[string]any)
+	if w := m["said"].([]string)[0]; !strings.Contains(w, NamesFileEnv) {
+		t.Errorf("first said %q", w)
+	}
+	if s := manifestsOf(t, out)["app/server "+d("m-stranger")].State; s != StateUnrecorded {
+		t.Errorf("m-stranger reads %q without the older names", s)
+	}
+}
+
+// references is one artifact_store_references tool, kept across calls as the runtime keeps the bundle.
+func references(t *testing.T, a *asked) func(map[string]any) (any, error) {
+	f := world()
+	s := &Store{Container: "mesh-registry", Run: f.run(t)}
+	for _, tl := range Tools(s, Controller{Ask: a.ask}, &Catalogue{Ask: a.ask}) {
+		if tl.Name == "artifact_store_references" {
+			return tl.Run
+		}
+	}
+	t.Fatal("no artifact_store_references")
+	return nil
+}
+
+func manifestsOf(t *testing.T, out any) map[string]Entry {
+	t.Helper()
+	entries, ok := out.(map[string]any)["manifests"].([]Entry)
+	if !ok {
+		t.Fatalf("no manifests in %v", out)
+	}
+	return stateByName(entries)
+}
+
+func TestReferencesReadTheDefinitionsUnderTheStoresOlderNames(t *testing.T) {
+	olderNames(t, oldName)
+	a := &asked{definitions: map[string]string{
+		"invoicing": container(oldName + "/app/server@" + d("m-stranger")),
+		"grafana":   container("grafana/grafana@" + d("upstream")),
+	}}
+	run := references(t, a)
+	out, err := run(map[string]any{"repository": "app/server"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	e := manifestsOf(t, out)["app/server "+d("m-stranger")]
+	if e.State != StateNamedByDefinition || len(e.Why) != 1 || !strings.Contains(e.Why[0], "invoicing") || !strings.Contains(e.Why[0], oldName) {
+		t.Errorf("m-stranger: %+v", e)
+	}
+	said := out.(map[string]any)["definitions"].(map[string]any)
+	if said["read"] != 2 || !reflect.DeepEqual(said["older_store_names"], []string{oldName}) ||
+		!reflect.DeepEqual(said["store_names"], []string{"artifact-store://", "store:5000"}) {
+		t.Errorf("definitions said %v", said)
+	}
+	if w := out.(map[string]any)["said"].([]string)[0]; strings.Contains(w, "could not be read") {
+		t.Errorf("a warning with every definition read: %s", w)
+	}
+	// A definition read at its commit is kept: the next call asks only for the list.
+	before := 0
+	for _, c := range a.calls {
+		if c == CatalogueModule {
+			before++
+		}
+	}
+	if _, err := run(map[string]any{"repository": "app/server"}); err != nil {
+		t.Fatal(err)
+	}
+	after := 0
+	for _, c := range a.calls {
+		if c == CatalogueModule {
+			after++
+		}
+	}
+	if before != 2 || after != 2 {
+		t.Errorf("asked catalog_module %d times, then %d: each definition at its commit is read once", before, after)
+	}
+}
+
+func TestADefinitionNotReadIsSaidFirstAndLeavesWhatItPinsUnrecorded(t *testing.T) {
+	olderNames(t, oldName)
+	a := &asked{
+		definitions: map[string]string{"invoicing": container(oldName + "/app/server@" + d("m-stranger")), "grafana": container("x")},
+		failing:     map[string]bool{"invoicing": true},
+	}
+	out, err := references(t, a)(map[string]any{"repository": "app/server"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m := out.(map[string]any)
+	if s := manifestsOf(t, out)["app/server "+d("m-stranger")].State; s != StateUnrecorded {
+		t.Errorf("m-stranger reads %q with its definition unread", s)
+	}
+	if w := m["said"].([]string)[0]; !strings.Contains(w, "1 definitions could not be read") {
+		t.Errorf("first said %q", w)
+	}
+	if u := m["definitions"].(map[string]any)["unread"].(map[string]string); u["invoicing"] == "" || len(u) != 1 {
+		t.Errorf("unread %v", u)
+	}
+
+	// The catalogue not answering at all: the records are still answered, and the warning stands first.
+	a = &asked{noCatalogue: true}
+	out, err = references(t, a)(map[string]any{})
+	if err != nil {
+		t.Fatal(err)
+	}
+	m = out.(map[string]any)
+	if w := m["said"].([]string)[0]; !strings.Contains(w, "the definitions could not be read") || !strings.Contains(w, "no responders") {
+		t.Errorf("first said %q", w)
+	}
+	if m["definitions"].(map[string]any)["not_asked"] == nil {
+		t.Errorf("definitions %v", m["definitions"])
+	}
+}
+
+func TestNoCatalogueIsSaidAndNothingIsAsked(t *testing.T) {
+	defs := (&Catalogue{}).Read(context.Background(), NamesOf("", ""))
+	if defs.NotAsked == "" || defs.Read != 0 {
+		t.Errorf("%+v", defs)
+	}
+}

modules/artifact-store-tools/cmd/artifact-store-tools/main.go

@@ -24,7 +24,7 @@ func main() {
 		UID:       os.Getuid(),
 	}
 	// An empty name serves as the module the runtime names (MESH_SERVED_MODULE): artifact-store-tools.
-	if err := stdio.Serve("", Tools(s, Controller{Ask: stdio.Ask})); err != nil {
+	if err := stdio.Serve("", Tools(s, Controller{Ask: stdio.Ask}, &Catalogue{Ask: stdio.Ask})); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}

modules/artifact-store-tools/cmd/artifact-store-tools/platforms_test.go

@@ -65,7 +65,7 @@ func TestAPlatformManifestTakesTheStateOfTheIndexNamingIt(t *testing.T) {
 	for i := range recs.References {
 		fill(&recs.References[i])
 	}
-	got := stateByName(Classify(v, recs))
+	got := stateByName(Classify(v, recs, nil))
 	up := "upstream/docker.io/library/golang "
 	for name, want := range map[string]string{
 		up + d("p-amd"):                         StateEligible, // only the eligible index names it
@@ -92,7 +92,7 @@ func TestAPlatformManifestTakesTheStateOfTheIndexNamingIt(t *testing.T) {
 	if len(mirrors) != 2 || !got["route-proxy/on-go_base "+d("i-pre")].Mirror || !got["route-proxy/on-go_base "+d("p-lost")].Mirror {
 		t.Errorf("offered as unrecorded copies: %v", mirrors)
 	}
-	um := UnrecordedMirrors(v, Classify(v, recs))
+	um := UnrecordedMirrors(v, Classify(v, recs, nil))
 	if len(um) != 2 || um[0].Reference != "artifact-store://route-proxy/on-go_base@"+d("i-pre") || um[0].OnlyTheir != 1+1+1000 {
 		t.Errorf("unrecorded copies: %+v", um)
 	}
@@ -104,7 +104,7 @@ func TestLettingAnIndexGoTakesItsOwnPlatformsAndSaysWhatStaysAndNamesOne(t *test
 	for i := range recs.References {
 		fill(&recs.References[i])
 	}
-	entries := Classify(v, recs)
+	entries := Classify(v, recs, nil)
 	old := "artifact-store://upstream/docker.io/library/golang@" + d("i-old")
 	gone := LetGoKeys(v, []string{old}, Spared(v, entries))
 	up := "upstream/docker.io/library/golang"

modules/artifact-store-tools/cmd/artifact-store-tools/store_test.go

@@ -215,7 +215,7 @@ func TestTheMarkIsTheCollectorsIncludingAnIndexAndSharedBlobs(t *testing.T) {
 func TestEveryStateIsGiven(t *testing.T) {
 	v := view(t, world())
 	got := map[string]string{}
-	for _, e := range Classify(v, withFill(records())) {
+	for _, e := range Classify(v, withFill(records()), nil) {
 		got[e.Repository+" "+e.Digest] = e.State
 	}
 	want := map[string]string{
@@ -239,7 +239,7 @@ func TestALetGoReferenceStillPresentIsSaidSo(t *testing.T) {
 	v := view(t, world())
 	r := records()
 	r.References = append(r.References, Record{Reference: "artifact-store://app/server@" + d("m-stranger"), State: "collected"})
-	for _, e := range Classify(v, withFill(r)) {
+	for _, e := range Classify(v, withFill(r), nil) {
 		if e.Digest == d("m-stranger") && e.State != StateCollectedPresent {
 			t.Errorf("state %s", e.State)
 		}
@@ -270,7 +270,7 @@ func TestBytesFreedCountASharedBlobAsKept(t *testing.T) {
 
 func TestOnlyTheirBytesLeaveOutWhatAnotherStateMarks(t *testing.T) {
 	v := view(t, world())
-	entries := Classify(v, withFill(records()))
+	entries := Classify(v, withFill(records()), nil)
 	sums := Summarise(v, entries, entries)
 	el := sums[StateEligible]
 	if el.OnlyTheirBytes != 500+v.L.Blobs[d("m-old")] {
@@ -284,6 +284,11 @@ type asked struct {
 	calls []string
 	args  []map[string]any
 	fail  map[string]bool
+	// definitions are the catalogue's modules and their manifests; failing, the modules whose
+	// definition cannot be read; noCatalogue, the catalogue not answering at all.
+	definitions map[string]string
+	failing     map[string]bool
+	noCatalogue bool
 }
 
 func (a *asked) ask(key string, body any) (json.RawMessage, error) {
@@ -299,6 +304,31 @@ func (a *asked) ask(key string, body any) (json.RawMessage, error) {
 	switch key {
 	case "seat:mesh-controller.artifacts":
 		answer = records()
+	case CatalogueModules:
+		if a.noCatalogue {
+			return nil, fmt.Errorf("no responders")
+		}
+		ms := []map[string]any{}
+		for name := range a.definitions {
+			ms = append(ms, map[string]any{"module": name, "commit": "c-" + name, "path": "modules/" + name})
+		}
+		answer = map[string]any{"modules": ms}
+	case CatalogueModule:
+		name, _ := args["module"].(string)
+		if a.failing[name] {
+			return nil, fmt.Errorf("no answer")
+		}
+		if args["commit"] != "c-"+name {
+			return nil, fmt.Errorf("asked %s at %v", name, args["commit"])
+		}
+		manifest, has := a.definitions[name]
+		if !has {
+			answer = map[string]any{"error": "the catalogue holds no " + name}
+			break
+		}
+		// The catalogue's tool answers through the runtime as the protocol's content list.
+		raw, _ := json.Marshal(map[string]any{"module": map[string]any{"module": name, "manifest": json.RawMessage(manifest)}})
+		return json.Marshal(map[string]any{"content": []map[string]any{{"type": "text", "text": string(raw)}}})
 	case "seat:mesh-controller.collect":
 		if args["confirm"] == "true" {
 			answer = CollectAnswer{LetGo: []string{"artifact-store://app/server@" + d("m-old")}}
@@ -315,7 +345,7 @@ func (a *asked) ask(key string, body any) (json.RawMessage, error) {
 func tool(t *testing.T, a *asked, name string) func(map[string]any) (any, error) {
 	f := world()
 	s := &Store{Container: "mesh-registry", Run: f.run(t)}
-	for _, tl := range Tools(s, Controller{Ask: a.ask}) {
+	for _, tl := range Tools(s, Controller{Ask: a.ask}, &Catalogue{Ask: a.ask}) {
 		if tl.Name == name {
 			return tl.Run
 		}
@@ -386,7 +416,7 @@ func TestTheToolsServedAreTheToolsTheManifestNames(t *testing.T) {
 		t.Fatal(err)
 	}
 	var served []string
-	for _, tl := range Tools(&Store{}, Controller{}) {
+	for _, tl := range Tools(&Store{}, Controller{}, &Catalogue{}) {
 		if !strings.HasPrefix(tl.Name, "artifact_store_") || tl.Description == "" || tl.Run == nil {
 			t.Errorf("tool %q", tl.Name)
 		}
@@ -398,7 +428,7 @@ func TestTheToolsServedAreTheToolsTheManifestNames(t *testing.T) {
 	if !reflect.DeepEqual(served, listed) {
 		t.Fatalf("served %v, manifest %v", served, listed)
 	}
-	want := []string{"seat:mesh-controller.artifacts", "seat:mesh-controller.collect"}
+	want := []string{"seat:mesh-controller.artifacts", "seat:mesh-controller.collect", CatalogueModules, CatalogueModule}
 	if !reflect.DeepEqual(m.Invokes, want) {
 		t.Errorf("invokes %v", m.Invokes)
 	}

modules/artifact-store-tools/cmd/artifact-store-tools/tools.go

@@ -13,7 +13,7 @@ import (
 
 // Tools are the artifact store's tools (novox/hq ADR 0251 §1). The first three only read; artifact_store_collect
 // only reads too, unless it is a real run, and then it asks the controller, which decides and deletes.
-func Tools(s *Store, c Controller) []stdio.Tool {
+func Tools(s *Store, c Controller, cat *Catalogue) []stdio.Tool {
 	ctx := context.Background()
 	repoArg := map[string]any{"type": "string", "description": "one repository, as the store names it (<module>/<artifact>)"}
 	return []stdio.Tool{
@@ -53,7 +53,9 @@ func Tools(s *Store, c Controller) []stdio.Tool {
 		{
 			Name: "artifact_store_references",
 			Description: "What the controller's records say of each manifest the artifact store holds: kept (a definition " +
-				"names it, or one of the five most recent builds of a module the mesh holds), the holder of a kept archive, " +
+				"names it, or one of the five most recent builds of a module the mesh holds), named by a definition (no " +
+				"record names it, and a definition in the catalogue pins it by digest, under the store's current name or " +
+				"an older one: the module is said), the holder of a kept archive, " +
 				"eligible (the mesh made it and keeps it for no reason), the holder of an eligible archive, let go yet present, " +
 				"a named document the controller keeps under a tag, or unrecorded — no record names it. A platform manifest " +
 				"takes the state of the recorded index naming it. Counted and sized by " +
@@ -67,11 +69,19 @@ func Tools(s *Store, c Controller) []stdio.Tool {
 				if err != nil {
 					return nil, err
 				}
+				// The definitions are read while the store is: each bounded below the runtime's call limit.
+				read := make(chan *Definitions, 1)
+				go func() {
+					older, why := OlderNames()
+					defs := cat.Read(ctx, NamesOf(recs.Store, older))
+					defs.NamesNotRead = why
+					read <- defs
+				}()
 				v, err := s.View(ctx)
 				if err != nil {
 					return nil, err
 				}
-				return References(v, recs, repo)
+				return References(v, recs, <-read, repo)
 			},
 		},
 		{
@@ -116,7 +126,7 @@ func Tools(s *Store, c Controller) []stdio.Tool {
 				if err != nil {
 					return map[string]any{"controller": answer, "bytes_not_worked_out": "the records could not be read: " + err.Error()}, nil
 				}
-				return Collected(v, answer, dry, Classify(v, recs)), nil
+				return Collected(v, answer, dry, Classify(v, recs, nil)), nil
 			},
 		},
 	}
@@ -225,11 +235,11 @@ func Usage(v *View, top int) map[string]any {
 }
 
 // References answers artifact_store_references.
-func References(v *View, recs *Records, only string) (map[string]any, error) {
+func References(v *View, recs *Records, defs *Definitions, only string) (map[string]any, error) {
 	if only != "" && v.L.Repos[only] == nil {
 		return nil, fmt.Errorf("the store holds no repository %q", only)
 	}
-	entries := Classify(v, recs)
+	entries := Classify(v, recs, defs)
 	byRepo := map[string][]Entry{}
 	for _, e := range entries {
 		byRepo[e.Repository] = append(byRepo[e.Repository], e)
@@ -243,7 +253,7 @@ func References(v *View, recs *Records, only string) (map[string]any, error) {
 	}
 	whole := Summarise(v, entries, entries)
 	said := []string{}
-	for _, state := range []string{StateKept, StateHolderKept, StateEligible, StateHolderEligible, StateCollectedPresent, StateNamedDocument, StateUnrecorded} {
+	for _, state := range []string{StateKept, StateNamedByDefinition, StateHolderKept, StateEligible, StateHolderEligible, StateCollectedPresent, StateNamedDocument, StateUnrecorded} {
 		if s := whole[state]; s != nil {
 			said = append(said, fmt.Sprintf("%s: %d manifests marking %s, %s of it marked by nothing else", state, s.Manifests, human(s.Bytes), human(s.OnlyTheirBytes)))
 		}
@@ -276,9 +286,57 @@ func References(v *View, recs *Records, only string) (map[string]any, error) {
 	if u := unreadNote(v); u != nil {
 		out["unread"] = u
 	}
+	out["definitions"] = definitionsSaid(defs)
+	if warn := definitionsWarning(defs); warn != "" {
+		// Said first: what it leaves out is a manifest a machine may run, read as unrecorded.
+		out["said"] = append([]string{warn}, said...)
+	}
 	return out, nil
 }
 
+// definitionsSaid is how the definitions were read: how many, under which names, and what was not read.
+func definitionsSaid(defs *Definitions) map[string]any {
+	if defs == nil {
+		return map[string]any{"read": 0, "not_asked": "the definitions were not read"}
+	}
+	var current, older []string
+	for _, n := range defs.Names.Current {
+		current = append(current, shownName(n))
+	}
+	for _, n := range defs.Names.Older {
+		older = append(older, shownName(n))
+	}
+	out := map[string]any{"read": defs.Read, "store_names": nonNil(current), "older_store_names": nonNil(older)}
+	if defs.NotAsked != "" {
+		out["not_asked"] = defs.NotAsked
+	}
+	if defs.NamesNotRead != "" {
+		out["older_store_names_not_read"] = defs.NamesNotRead
+	}
+	if len(defs.Unread) > 0 {
+		out["unread"] = defs.Unread
+	}
+	return out
+}
+
+// definitionsWarning says, when any definition was not read, that a manifest it pins reads as unrecorded.
+func definitionsWarning(defs *Definitions) string {
+	switch {
+	case defs == nil:
+		return ""
+	case defs.NotAsked != "":
+		return "the definitions could not be read (" + defs.NotAsked + "), so a manifest a definition pins " +
+			"and no record names reads as unrecorded here: ask again before reading unrecorded as unused"
+	case defs.NamesNotRead != "":
+		return defs.NamesNotRead + ", so a manifest a definition pins under an older name of the store and no " +
+			"record names reads as unrecorded here"
+	case len(defs.Unread) > 0:
+		return fmt.Sprintf("%d definitions could not be read (listed in definitions.unread), so a manifest one "+
+			"of them pins and no record names reads as unrecorded here: ask again — what was read is kept", len(defs.Unread))
+	}
+	return ""
+}
+
 // Collected answers artifact_store_collect: the controller's answer, and what the store's collector frees.
 func Collected(v *View, a *CollectAnswer, dry bool, entries []Entry) map[string]any {
 	refs := a.LetGo

modules/artifact-store-tools/module.json

@@ -3,7 +3,9 @@
   "version": "1",
   "invokes": [
     "seat:mesh-controller.artifacts",
-    "seat:mesh-controller.collect"
+    "seat:mesh-controller.collect",
+    "mesh-catalog.catalog_modules",
+    "mesh-catalog.catalog_module"
   ],
   "tools": [
     "artifact_store_repositories",
@@ -11,6 +13,29 @@
     "artifact_store_references",
     "artifact_store_collect"
   ],
+  "settings": {
+    "older-store-names": {
+      "kind": "preference",
+      "default": "none",
+      "why": "the names the artifact store had before, as a definition may still pin an image under them: host names or host:port, separated by spaces; none when it had no other. artifact_store_references reads every definition under these as well as under the store's current name, so an image a definition pins under one is said to be named by a definition (novox/hq issue 323)"
+    }
+  },
+  "resources": [
+    {
+      "id": "state",
+      "type": "directory",
+      "mode": "0700",
+      "place": "."
+    },
+    {
+      "id": "store-names",
+      "type": "file",
+      "path": "${dir:state}/store-names",
+      "mode": "0600",
+      "trusted": false,
+      "content": "# The names the artifact store had before, from the setting older-store-names, written by the mesh.\n# artifact_store_references reads every definition under these too (novox/hq issue 323).\n# Replaced on every push; change the setting, never this file.\nolder=${setting:older-store-names}\n"
+    }
+  ],
   "build": {
     "artifacts": [
       {
@@ -24,7 +49,8 @@
           "artifact-store-tools"
         ],
         "env": {
-          "MESH_ARTIFACT_STORE_CONTAINER": "mesh-registry"
+          "MESH_ARTIFACT_STORE_CONTAINER": "mesh-registry",
+          "MESH_ARTIFACT_STORE_NAMES_FILE": "${dir:state}/store-names"
         }
       }
     ]

modules/betterbird/README.md

@@ -1,8 +1,10 @@
 # betterbird
 
 Betterbird, the mail and calendar client of g14 and shanks (a Thunderbird fork, with the operator's
-Exchange calendar through the Owl add-on), as a module (novox/hq issue 345, ADR 0208). It requires
-`x11-display`, so it is assigned only where a display server is held on the same machine.
+Exchange calendar through the Owl add-on), as a module (novox/hq issue 345, ADR 0208, ADR 0316, ADR 0317,
+to-be 56). It requires `x11-display`, so it is assigned only where a display server is held on the same
+machine. It installs Betterbird from a pinned upstream release, ships Owl with it through Betterbird's
+enterprise policy, and declares the operator's mail accounts without their credentials.
 
 It exists because a symptom had no tools: on a workstation, a calendar reminder appeared as a
 transparent window with nothing in it (2026-10-09). Nothing in the mesh could say which window that
@@ -11,24 +13,57 @@ issue 345.
 
 ## Owns
 
-| what | where |
-|---|---|
-| the module's directory | `~/.config/betterbird/` |
-| the module's `user.js`, filled from the setting `prefs` | `~/.config/betterbird/user.js` |
+| what | where | class |
+|---|---|---|
+| Betterbird, the upstream release (`archive`, pinned by URL and sha256) | `/opt/betterbird` | owned, whole |
+| the enterprise policy (`install/distribution/policies.json`) | `/opt/betterbird/distribution` | owned, whole |
+| Owl's xpi (`owl`, pinned by the vendor's sha256) | `/opt/betterbird/owl` | owned, whole |
+| the spelling dictionaries' default (`install/defaults-pref/vendor-prefs.js`) | `/opt/betterbird/defaults/pref` | owned: its one file |
+| the tools' program, for the start's preparation | `/usr/local/lib/mesh-betterbird` | owned, whole |
+| the start | `/usr/local/bin/betterbird` | owned, whole |
+| the launcher entry | `/usr/local/share/applications/eu.betterbird.Betterbird.desktop` | owned, whole |
+| the module's directory, with its `user.js` (setting `prefs`), `accounts.json` (setting `accounts`) and the record of adopted and created accounts | `~/.config/betterbird/` | owned, whole |
+| the profile's `user.js`, placed by the tools | the profile | the module's, or never touched |
+| the account lists in the profile's `prefs.js` | the profile | written into: the module's keys only |
+| the profile: mail, address books, calendars, logins | `~/.thunderbird/` | found (ADR 0182) |
 
-Nothing else. It holds no seat and adds no start.
+**The community package `betterbird-bin` is declared absent** (ADR 0180), before anything is placed in
+`/opt/betterbird`: the node-engine removes it with `pacman -R`, then unpacks the release where the package
+had it. Betterbird chooses its profile by its installation's path, so the same profile opens after the
+switch. A package left in place (its removal failed) holds the path, and the release is refused there by
+the node-engine rather than mixed in. The module creates no link: the start, a launcher entry naming the
+icon in the installation, and the dictionaries as a default preference replace the package's links.
+
+**Every new build waits for the operator** (`upgrade: record`): the first push to a node removes the
+package and replaces what a running Betterbird has open, so the operator quits Betterbird, then pushes.
+An upgrade is a change to the pins, reviewed and delivered like any other (ADR 0316 §5).
+
+**The pins.** The release is `betterbird-153.4.0esr-bb10.en-US.linux-x86_64.tar.xz` (81,620,684 bytes) and
+Owl is 1.5.6.1 (430,201 bytes), each pinned by sha256 in `module.json`. The build seat fetches each once,
+refuses it when the digest differs, keeps it under its sha256, and packs it into the artifact store; a node
+receives the mesh's archive by digest and never asks the vendor. **Owl is never in this repository**: its
+licence forbids copying it to third parties, and its vendor serves only its newest version, at one
+address. Keeping the pinned copy in the mesh's private artifact store for the operator's own machines was
+the operator's call (2026-10-12, ADR 0316 §6).
+
+**Owl's range.** Owl declares which Betterbird versions it supports (`strict_min_version` to
+`strict_max_version`: 115 to 156 for 1.5.6.1). `owlSupports` in `manifest_test.go` holds the range read
+from each pinned xpi, and the module's tests refuse a Betterbird pin outside it: moving Owl's pin means
+reading the new range there (ADR 0316 §8).
+
+**The policy** turns Betterbird's own updater off (`DisableAppUpdate`, which Betterbird's update check
+honours) and installs Owl into every profile from `file:///opt/betterbird/owl/owl.xpi` as
+`force_installed`, with `updates_disabled`. A profile that already runs another Owl keeps it: the policy
+installs the pinned one where Owl is missing. A newer Owl in the profile (g14 runs 1.5.7) is said as a
+fact by `betterbird_status`; Owl installed by policy cannot be removed in Betterbird, so the remedy is
+moving the pin. An older one is a finding of `betterbird_check`, with the same remedy. **Owl's licence stays the person's**: the mesh holds no licence, key or payment (ADR 0316 §9).
+
+**No start of its own.** Betterbird is started by the operator from the launcher. The start
+(`/usr/local/bin/betterbird`) first runs `betterbird-tools prepare`, which, with no Betterbird of the
+account running, places the user.js and writes the created accounts into the account lists; then it
+starts Betterbird either way. `betterbird_restart` starts it as the transient user unit
+`mesh-betterbird`, so its output then goes to the journal.
 
-- **No package.** g14 and shanks both run `betterbird-bin` 153.1.0esr-1, installed explicitly from the
-  AUR: `pacman` counts it as foreign. The node-engine installs packages from the official
-  repositories only, so the module does not declare it, and **installing and upgrading Betterbird stay
-  the operator's** (an AUR helper). `betterbird_status` says the version and that it is from the AUR;
-  `betterbird_check` says when it is missing.
-- **No start.** Betterbird is started by the operator from the launcher (on the workstation measured,
-  it runs in the login session's scope, started by hand, with no autostart entry and no line in i3's
-  configuration). `betterbird_restart` starts it as the transient user unit `mesh-betterbird`, so its
-  output then goes to the journal.
-- **The profile is Betterbird's** (ADR 0182): `~/.thunderbird/` holds the mail, the address books,
-  the calendars' caches, the logins and the keys. The module declares none of it.
 
 ## The user.js: how a preference is declared
 
@@ -52,33 +87,104 @@ default, the one in use, is the other.
 what to do. The tools refuse a declared file that holds anything but comments and `user_pref`
 statements, or that sets a preference whose name can hold a credential.
 
-The file is **trusted** (it carries no `"trusted": false`): a preference can weaken how the mail client
-checks a server, so the setting is changed only at the controller's terminal, never through a verb
-(novox/hq issue 339).
+The file is **trusted** (`"trusted": true`): a preference can weaken how the mail client checks a server,
+so the setting is changed only at the controller's terminal or proposed and set on the operator's warrant
+(novox/hq issue 339, ADR 0277). An account's preferences (`mail.account.`, `mail.identity.`, `mail.server.`,
+`mail.smtpserver.` and the account lists) are refused in `prefs`: an account is declared in `accounts`, so
+it has one owner (ADR 0316 §11).
+## The accounts: declared without credentials (ADR 0316 §10–§16, ADR 0317)
+
+The setting `accounts` reaches the machine as `~/.config/betterbird/accounts.json`, a trusted mergeable
+file: a map of accounts by name, each with `address`, `from-name` and `label` (optional), `incoming` (`kind`
+imap or pop3, `host`, `port`, `security` tls, starttls or none, `sign-in` password, encrypted-password,
+oauth, kerberos, ntlm or tls-certificate, `user`) and `outgoing` (the same, without a kind; its sign-in may
+be none), and, only in a node's own layer, `key`. **Never a password or a token**: the whole file is
+refused when any key in it is shaped like one, and an account signs in at its first use, in Betterbird's
+own window, where Betterbird keeps the result in its login store. The work account through Owl is never
+declared: the person creates it in Owl's setup (ADR 0316 §13).
+
+At every apply (the start from the launcher, `betterbird_user_js` with apply, `betterbird_restart`), each
+declared account, in its place in the setting, is (ADR 0317 §1):
+
+1. **kept by its recorded keys**, when the module recorded it on this node for this profile;
+2. **its creation**, when it is under the module's own keys (`account_mesh_<name>`, `id_mesh_<name>`,
+   `server_mesh_<name>`, `smtp_mesh_<name>`);
+3. **adopted by the key a node's layer names** (`key`), when that account is in the list, its default
+   identity has the address and it is not Owl's;
+4. **adopted by its address**, when exactly one account's default identity has it: its keys (account,
+   default identity, incoming server, and the outgoing server that identity names) become the module's, and
+   the account lists are left as they are;
+5. **created** under the module's own keys when no account has it: its keys are added at the end of
+   `mail.accountmanager.accounts` and `mail.smtpservers` in `prefs.js`, every other key kept in its place,
+   only while Betterbird is not running.
+
+**Refused, for that account alone and with the remedy** (§7): two accounts with the address (remove the
+duplicate in Betterbird, or name the `key`), Owl's account at the address, a named key that does not
+qualify, an account of another kind than declared (never converted), an identity that names no outgoing
+server, and an outgoing server that another identity, neither adopted nor the module's, also uses
+(Betterbird lets identities share one, and the declared values would change that other account's sending;
+ADR 0317 §2 leaves the identity's server and the lists as they are, so the module refuses rather than give
+it a server of its own). A recorded adoption follows the identity's current outgoing server at every apply,
+under the same rule. The other accounts go ahead; the start and `betterbird_check` say it.
+`betterbird_user_js` answers an account's preferences by name with their values withheld.
+
+The declared fields are written in the user.js under the account's keys, so they win at every start; only
+the fields the setting names, never the account's directory, folders, filters, caches, mail or kept
+sign-in, so an adopted account keeps its sign-in (§5). The apply names, by preference name only, each one
+whose value it changed (§4). What was adopted or created is recorded in
+`~/.config/betterbird/accounts-record.json`. **Leaving the setting** releases an adopted account (its
+lines and its record go, the account stays the person's) and takes a created account's keys out of the
+lists (its mail stays in the profile).
+
+**The value is derived, not retyped** (§9): `betterbird_accounts` with `propose` builds `accounts` from the
+profile (every account but Owl's, no credential) and proposes it through the controller's settings verb;
+the operator reads it whole at their desk (`settings proposals <id>`) and approves on a channel that proves
+who answers. Its answer to its caller holds counts and kinds only.
+
+**A node with no profile yet.** The preparation needs the profile Betterbird makes at its first start: on a
+node set up from nothing, the declared accounts are written at the second start from the launcher (or at
+`betterbird_restart`).
+
 
 ## Tools
 
 They are served by the node's runtime as the operator account (ADR 0175). **No answer carries mail, a
-calendar entry, an account, an address or a credential.**
+calendar entry, an address, a host, an account's name or a credential**: accounts are said by count, place
+and key.
 
 | tool | does |
 |---|---|
-| `betterbird_status` (r) | whether it runs (pid, since, scope, children), the package and version and that it is from the AUR, where its output goes, the profile and how it was found, the user.js (declared, placed, in effect), the add-ons the operator installed (ids), and the preferences that decide how its windows and notifications look |
+| `betterbird_status` (r) | whether it runs (pid, since, scope, children); what is installed and from where (the mesh's release, or the community package before the switch), its version and build beside the newest published build (Betterbird's own `versions.txt`); the policy; Owl's version against the pin and whether it is active; where its output goes; the profile and how it was found; the user.js (declared, placed, in effect); the declared accounts by count and, per place, adopted, created or refused with their keys; the add-ons in the profile (ids, versions); the preferences that decide how its windows and notifications look |
 | `betterbird_prefs` (r) | named preferences or prefixes (ending in `.` or `*`, at most 200; an empty name, `*` or `.` is refused): value and source (user.js, prefs.js or the default). Withheld without its value: a name that can hold a credential (`password`, `token`, `oauth`, `signon`, …); one that names an account, server, calendar, recent folder or person (`mail.server.`, `mail.identity.`, `mail.last_msg…`, `messenger.account.`, `mail.cloud_files.`, `calendar.registry.`, …); and every `extensions.*` but the theme's id (`extensions.activeThemeID`). In every value answered, the home is `~`, and a mail address, a `user%40domain@host` URI and a host name are masked |
 | `betterbird_user_js` (r; a with `apply`) | the declared user.js against the profile's; `apply` places it |
 | `betterbird_log` (r) | the last lines of the journal of `mesh-betterbird` (or of the reminder test), addresses and credentials masked (the value after `password=`, `token:` and the like, and the token after `Bearer`/`Basic`). A Betterbird the module did not start prints elsewhere, and the answer says where |
 | `betterbird_restart` (a) | ends Betterbird (asked to quit, forced after 8 s), places the user.js where allowed, starts it as `mesh-betterbird`. **Refused while a composer window is open** (X instance `Msgcompose`, whatever its class), because the unsent message would be lost, unless `discard_unsent` is true, which only the operator's yes justifies. It answers within the runtime's 30 s: a start not yet seen after 4 s is said in `note`, and `betterbird_status` shows it |
-| `betterbird_check` (r) | installed; one running; profile found; the user.js on the machine, valid, placed, in effect; its output read |
+| `betterbird_check` (r) | installed from the mesh's release and not behind the newest published build; the policy placed; Owl at its pin and active; one running; profile found; the user.js on the machine, valid, placed, in effect; the declared accounts in the list, none refused, each signed in once; its output read |
+| `betterbird_accounts` (r; a with `propose`) | the profile's accounts by count and kind (declarable, Owl's, others); with `propose`, the setting `accounts` built from them and proposed to the operator (ADR 0317 §9) |
 | `betterbird_reminder_test` (a) | a reminder on demand without the operator's calendar (below) |
 
 ### A reminder on demand
 
+**It opens windows on the operator's screen**, and its description says so first, so a caller tells the
+operator before calling it. On 2026-10-12 at 12:05 a test Betterbird with an empty profile carrying the
+operator's theme looked like the operator's configuration lost; so the test is **visibly a test**: its
+profile carries a `userChrome.css` that frames every window of the test Betterbird in red and runs a red
+band reading MESH TEST across its top, and its event is called "MESH TEST reminder (a throw-away
+Betterbird of the mesh, not your calendar)". The reminder window itself is left unstyled, because how
+Betterbird draws it is what the test looks at; its title is the event's. A window title cannot be set by a
+preference, so the marking is the band, the frame and the event's name.
+
 `betterbird_reminder_test` starts a **second** Betterbird with `--no-remote` in a throw-away profile
 under `/run/user/<uid>/mesh-betterbird-reminder-test/`, as the user unit
 `mesh-betterbird-reminder-test` (ended after 10 minutes at most). The profile holds the module's
-user.js and one calendar: a local `.ics` file with one event, "Mesh reminder test", whose reminder is
+user.js (the setting `prefs`; never a declared account) and one calendar: a local `.ics` file with one
+event, "MESH TEST reminder", whose reminder is
 due `after` seconds from the call (default 40). `carry` copies named preferences of the operator's
-profile into it (a theme, a colour switch), under the same limits as `betterbird_prefs`. Then:
+profile into it (a theme, a colour switch), under the same limits as `betterbird_prefs`. The test's own
+preferences come last in its user.js, so nothing declared or carried overrides them; one of them turns
+Betterbird's update check off (`betterbird.update.checkIntervalDays` 0), because a fresh profile checks
+at its start and, when a newer build is published, opens the About window on the operator's screen
+(seen 2026-10-12). Then:
 
 - `xorg_windows` with class `Calendar` answers the reminder window: role `AlarmWindow`, type `Dialog`,
   its depth (32: a visual with alpha, which the compositor blends), its map state;
@@ -106,13 +212,19 @@ A window of depth 32 that its program has not drawn is transparent under a compo
 that is why the symptom looks the way it does. Why Betterbird did not draw it is hq issue 345's
 question.
 
-## What changes when it is assigned
+## What changes when it is pushed
 
-| | g14 | shanks |
-|---|---|---|
-| files | `~/.config/betterbird/` and its `user.js` (no preference) | the same |
-| the profile | untouched until `betterbird_user_js` with `apply` or `betterbird_restart` | the same; the profile has no user.js today, so `apply` may place one |
-| Betterbird | keeps running as started | keeps running as started (since 2026-10-04, its output on the session's pipe nobody reads: `betterbird_check` names it until `betterbird_restart`) |
+The module is assigned to shanks today (look-only, from issue 345's first part); g14 runs Betterbird
+outside the mesh. With this version, a push to a node (each waits for the operator: `upgrade: record`):
+
+| | on a node with the community package (g14, shanks) |
+|---|---|
+| the package | `betterbird-bin` removed (quit Betterbird first) |
+| `/opt/betterbird` | the mesh's 153.4.0esr-bb10, in the same place, so the same profile opens |
+| the policy, Owl | placed; Owl installed into the profile by Betterbird at its next start where it is missing |
+| `/usr/local` | the start, the launcher entry, the tools' program |
+| `~/.config/betterbird/` | `user.js`, `accounts.json` (no account until the setting `accounts` is approved) |
+| the profile | untouched until the next start from the launcher, `betterbird_user_js` with apply, or `betterbird_restart` |
 
 ## Relies on
 
@@ -120,3 +232,6 @@ question.
 - **`xorg`** for `xorg_windows` and `xorg_screenshot`, which look at Betterbird's windows. This module
   carries no window code of its own.
 - `systemd-run` and `journalctl` of the account's user manager.
+- The build seat's archive pinned by URL and sha256 (mesh-controller, ADR 0316 §2): a controller that does
+  not know it refuses this manifest.
+- The controller's `settings` verb, for `betterbird_accounts` with `propose` (`invokes`).

modules/betterbird/cmd/betterbird-tools/accounts.go

@@ -0,0 +1,811 @@
+package main
+
+// The operator's mail accounts, declared without credentials (novox/hq ADR 0316 §10–§14, to-be 56 §4).
+//
+// The setting `accounts` reaches the machine as ~/.config/betterbird/accounts.json, a file the node-engine
+// writes from the module's settings layers. Per account it names the address, the incoming server and the
+// outgoing server; never a password or a token, and the whole file is refused when any key in it is shaped
+// like one. Betterbird's accounts are preferences, so a declared account becomes:
+//
+//   - its declared fields as preferences in the user.js the module places, where they win at every start
+//     (§11): under the keys of the account the profile already holds at that address, which the module adopts
+//     (novox/hq ADR 0317), or, where the profile holds none, under keys of the module's own that end in
+//     mesh_<name> (account_mesh_<name>, id_mesh_<name>, server_mesh_<name>, smtp_mesh_<name>);
+//   - for an account the module created, its key in the account list (mail.accountmanager.accounts) and in the
+//     list of outgoing servers (mail.smtpservers) of the profile's prefs.js: written into, never owned, and
+//     only while Betterbird is not running, because it rewrites prefs.js when it quits (§12). Every other key
+//     keeps its place, and an adopted account's keys are in the lists already.
+//
+// Which account is adopted, created or refused is adoption.go's.
+//
+// Nobody's password passes through here: an account signs in at its first use, in Betterbird's own window,
+// and Betterbird keeps the result in its login store (§14). Of that store the module reads only the server
+// names each entry is kept for, which Betterbird writes in the clear, to count the declared accounts that
+// have not signed in yet (§16); never a user name or a password, which are encrypted there anyway.
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+
+	stdio "git.novox.be/novox/mesh-sdk/go"
+)
+
+// accountsFile is the setting accounts on the machine, written by the node-engine.
+const accountsFile = ".config/betterbird/accounts.json"
+
+// Account is one declared mail account, in the shape of the setting accounts: keyed by its name.
+type Account struct {
+	Address string `json:"address"`
+	// FromName is the name the account's mail is sent under. Absent: Betterbird's, none.
+	FromName string `json:"from-name,omitempty"`
+	// Label is what Betterbird shows the account as. Absent: its address.
+	Label    string `json:"label,omitempty"`
+	Incoming Server `json:"incoming"`
+	Outgoing Server `json:"outgoing"`
+	// Key is the profile's account key to adopt, given only in a node's own layer to settle an address the
+	// profile holds more than once (novox/hq ADR 0317 §8).
+	Key string `json:"key,omitempty"`
+}
+
+// Server is an account's incoming or outgoing server: never a password or a token.
+type Server struct {
+	// Kind is imap or pop3, for the incoming server; the outgoing one is smtp and says nothing.
+	Kind     string `json:"kind,omitempty"`
+	Host     string `json:"host"`
+	Port     int    `json:"port,omitempty"`
+	Security string `json:"security"`
+	SignIn   string `json:"sign-in"`
+	User     string `json:"user,omitempty"`
+}
+
+// The words a server's connection security and sign-in method are said in, and Betterbird's numbers for
+// them (socketType / try_ssl, authMethod).
+var (
+	securities = map[string]int{"none": 0, "starttls": 2, "tls": 3}
+	signIns    = map[string]int{"none": 1, "password": 3, "encrypted-password": 4, "kerberos": 5, "ntlm": 6,
+		"tls-certificate": 7, "oauth": 10}
+)
+
+func wordFor(words map[string]int, n int) string {
+	for w, v := range words {
+		if v == n {
+			return w
+		}
+	}
+	return ""
+}
+
+var (
+	accountName  = regexp.MustCompile(`^[a-z][a-z0-9]{0,30}$`)
+	addressShape = regexp.MustCompile(`^[^\s@"\\]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}$`)
+	hostShape    = regexp.MustCompile(`^[A-Za-z0-9](?:[A-Za-z0-9.\-]*[A-Za-z0-9])?$`)
+	profileKey   = regexp.MustCompile(`^[A-Za-z0-9_]{1,64}$`)
+	// plainText is a value written into a preference: no quote, backslash or line break.
+	plainText = regexp.MustCompile(`^[^"\\\n\r]*$`)
+	// secretKey is a key the accounts file may never carry, at any depth: the setting holds no credential.
+	secretKey = regexp.MustCompile(`(?i)(pass|secret|token|oauth.?refresh|refresh|credential|api.?key|private.?key|cookie|bearer)`)
+)
+
+// keysOf are the module's own keys for a declared account: each ends in mesh_<name>.
+func keysOf(name string) (account, identity, server, smtp string) {
+	return "account_mesh_" + name, "id_mesh_" + name, "server_mesh_" + name, "smtp_mesh_" + name
+}
+
+// ownKey is a key of an account list the module wrote, and the name it was declared under.
+var ownKey = regexp.MustCompile(`^(?:account|smtp)_mesh_([a-z][a-z0-9]{0,30})$`)
+
+// readAccounts reads the declared accounts. A missing file is no account (the module is older here); a file
+// that carries a key shaped like a credential, an unknown field or a value that cannot be written is refused
+// whole, naming the key and never a value.
+func (m *Machine) readAccounts() (map[string]Account, bool, error) {
+	raw, err := readBounded(m.home(accountsFile))
+	if errors.Is(err, os.ErrNotExist) {
+		return map[string]Account{}, false, nil
+	}
+	if err != nil {
+		return nil, false, err
+	}
+	accounts, err := parseAccounts(raw)
+	return accounts, true, err
+}
+
+func parseAccounts(raw []byte) (map[string]Account, error) {
+	var tree any
+	if err := json.Unmarshal(raw, &tree); err != nil {
+		return nil, fmt.Errorf("~/%s is not JSON: %v", accountsFile, err)
+	}
+	if where := secretKeyIn(tree, ""); where != "" {
+		// An account's name is said by nothing: its segment of the path is withheld.
+		if parts := strings.SplitN(where, ".", 3); len(parts) == 3 && parts[0] == "accounts" {
+			where = "accounts.<an account>." + parts[2]
+		}
+		return nil, fmt.Errorf("the setting accounts carries %s, a key shaped like a credential: an account is declared "+
+			"without its password or token, which it signs in with at its first use (novox/hq ADR 0316 §10, §14). "+
+			"Take it out at the controller's terminal", where)
+	}
+	var top map[string]json.RawMessage
+	if err := json.Unmarshal(raw, &top); err != nil {
+		return nil, fmt.Errorf("~/%s is not an object: %v", accountsFile, err)
+	}
+	accounts := map[string]Account{}
+	if body, ok := top["accounts"]; ok && string(body) != "null" {
+		dec := json.NewDecoder(bytes.NewReader(body))
+		dec.DisallowUnknownFields()
+		if err := dec.Decode(&accounts); err != nil {
+			return nil, fmt.Errorf("the setting accounts is not a map of accounts by name: %v", err)
+		}
+	}
+	var problems []string
+	names := sortedNames(accounts)
+	for i, name := range names {
+		problems = append(problems, accountProblems(fmt.Sprintf("declared account %d of %d", i+1, len(names)),
+			name, accounts[name])...)
+	}
+	if len(problems) > 0 {
+		return nil, fmt.Errorf("the setting accounts is refused: %s", strings.Join(problems, "; "))
+	}
+	return accounts, nil
+}
+
+// secretKeyIn is the path of the first key shaped like a credential in a JSON tree, or "".
+func secretKeyIn(node any, at string) string {
+	switch v := node.(type) {
+	case map[string]any:
+		keys := make([]string, 0, len(v))
+		for k := range v {
+			keys = append(keys, k)
+		}
+		sort.Strings(keys)
+		for _, k := range keys {
+			here := k
+			if at != "" {
+				here = at + "." + k
+			}
+			if secretKey.MatchString(k) {
+				return here
+			}
+			if w := secretKeyIn(v[k], here); w != "" {
+				return w
+			}
+		}
+	case []any:
+		for i, x := range v {
+			if w := secretKeyIn(x, fmt.Sprintf("%s[%d]", at, i)); w != "" {
+				return w
+			}
+		}
+	}
+	return ""
+}
+
+func sortedNames(accounts map[string]Account) []string {
+	names := make([]string, 0, len(accounts))
+	for n := range accounts {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	return names
+}
+
+// accountProblems is what is wrong with one declared account, said of it by its place (label) and never by a
+// value of it, its name included (novox/hq ADR 0316 §16).
+func accountProblems(label, name string, a Account) []string {
+	var out []string
+	say := func(format string, args ...any) { out = append(out, label+": "+fmt.Sprintf(format, args...)) }
+	if !accountName.MatchString(name) {
+		say("an account's name is lower-case letters and digits, starting with a letter (it names the module's keys, mesh_<name>)")
+	}
+	if !addressShape.MatchString(a.Address) {
+		say("the address is not a mail address")
+	}
+	if a.Key != "" && !profileKey.MatchString(a.Key) {
+		say("key is an account key of the profile, such as account2")
+	}
+	for field, v := range map[string]string{"from-name": a.FromName, "label": a.Label} {
+		if !plainText.MatchString(v) {
+			say("%s holds a quote, a backslash or a line break", field)
+		}
+	}
+	for side, s := range map[string]Server{"incoming": a.Incoming, "outgoing": a.Outgoing} {
+		switch {
+		case side == "incoming" && s.Kind != "imap" && s.Kind != "pop3":
+			say("the incoming server's kind is imap or pop3")
+		case side == "outgoing" && s.Kind != "" && s.Kind != "smtp":
+			say("the outgoing server is smtp")
+		}
+		if !hostShape.MatchString(s.Host) {
+			say("the %s server's host is not a host name", side)
+		}
+		if s.Port < 0 || s.Port > 65535 {
+			say("the %s server's port is not a port", side)
+		}
+		if _, ok := securities[s.Security]; !ok {
+			say("the %s server's security is tls, starttls or none", side)
+		}
+		if _, ok := signIns[s.SignIn]; !ok || (side == "incoming" && s.SignIn == "none") {
+			say("the %s server's sign-in is password, encrypted-password, oauth, kerberos, ntlm or tls-certificate%s",
+				side, map[bool]string{true: ", or none", false: ""}[side == "outgoing"])
+		}
+		if !plainText.MatchString(s.User) {
+			say("the %s server's user holds a quote, a backslash or a line break", side)
+		}
+	}
+	return out
+}
+
+// quoted is a preference's string value as user.js writes it.
+func quoted(s string) string { return strconv.Quote(s) }
+
+// declaredPrefs are a declared account's fields as preferences under the keys it resolved to, name to value
+// as user.js writes it, in a fixed order. Only the fields the setting names (novox/hq ADR 0317 §5): never
+// the account's directory, folders, filters or caches. An adopted account keeps its kind, the outgoing server
+// its identity names, and its own name and sender's name where the declaration says none; a created one
+// gets every field.
+func declaredPrefs(k keySet, a Account, adopted bool) [][2]string {
+	label := a.Label
+	if label == "" && !adopted {
+		label = a.Address
+	}
+	inPort := a.Incoming.Port
+	if inPort == 0 {
+		inPort = defaultPort(a.Incoming.Kind, a.Incoming.Security)
+	}
+	outPort := a.Outgoing.Port
+	if outPort == 0 {
+		outPort = defaultPort("smtp", a.Outgoing.Security)
+	}
+	var out [][2]string
+	add := func(key, value string) { out = append(out, [2]string{key, value}) }
+	if !adopted {
+		add("mail.account."+k.Account+".identities", quoted(k.Identity))
+		add("mail.account."+k.Account+".server", quoted(k.Server))
+	}
+	if a.FromName != "" || !adopted {
+		add("mail.identity."+k.Identity+".fullName", quoted(a.FromName))
+	}
+	add("mail.identity."+k.Identity+".useremail", quoted(a.Address))
+	if !adopted {
+		add("mail.identity."+k.Identity+".smtpServer", quoted(k.SMTP))
+		add("mail.identity."+k.Identity+".valid", "true")
+		add("mail.server."+k.Server+".type", quoted(a.Incoming.Kind))
+	}
+	add("mail.server."+k.Server+".hostname", quoted(a.Incoming.Host))
+	add("mail.server."+k.Server+".port", strconv.Itoa(inPort))
+	add("mail.server."+k.Server+".socketType", strconv.Itoa(securities[a.Incoming.Security]))
+	add("mail.server."+k.Server+".authMethod", strconv.Itoa(signIns[a.Incoming.SignIn]))
+	add("mail.server."+k.Server+".userName", quoted(a.Incoming.User))
+	if label != "" {
+		add("mail.server."+k.Server+".name", quoted(label))
+	}
+	add("mail.smtpserver."+k.SMTP+".hostname", quoted(a.Outgoing.Host))
+	add("mail.smtpserver."+k.SMTP+".port", strconv.Itoa(outPort))
+	add("mail.smtpserver."+k.SMTP+".try_ssl", strconv.Itoa(securities[a.Outgoing.Security]))
+	add("mail.smtpserver."+k.SMTP+".authMethod", strconv.Itoa(signIns[a.Outgoing.SignIn]))
+	add("mail.smtpserver."+k.SMTP+".username", quoted(a.Outgoing.User))
+	if label != "" {
+		add("mail.smtpserver."+k.SMTP+".description", quoted(label))
+	}
+	return out
+}
+
+// defaultPort is the port a server listens on when the declaration says none.
+func defaultPort(kind, security string) int {
+	switch {
+	case kind == "imap" && security == "tls":
+		return 993
+	case kind == "imap":
+		return 143
+	case kind == "pop3" && security == "tls":
+		return 995
+	case kind == "pop3":
+		return 110
+	case security == "tls":
+		return 465
+	case security == "starttls":
+		return 587
+	}
+	return 25
+}
+
+// composeUserJS is the user.js the module places in the profile: the declared file (the setting prefs), then
+// each adopted or created account's declared fields under its keys. A refused account has none.
+func composeUserJS(declaredText string, accounts map[string]Account, resolved []resolvedAccount) string {
+	var lines []string
+	for _, r := range resolved {
+		if r.How == refused {
+			continue
+		}
+		lines = append(lines, fmt.Sprintf("// declared account %d: %s under %s", r.Place, r.How, r.Keys.Account))
+		for _, p := range declaredPrefs(r.Keys, accounts[r.name], r.How == adopted) {
+			lines = append(lines, fmt.Sprintf("user_pref(%s, %s);", quoted(p[0]), p[1]))
+		}
+	}
+	if len(lines) == 0 {
+		return declaredText
+	}
+	return strings.TrimRight(declaredText, "\n") + "\n\n" +
+		"// The accounts the setting accounts declares (novox/hq ADR 0316 §11, ADR 0317): the fields it names, under\n" +
+		"// the keys of the account adopted or created. No password or token: an account signs in at its first use.\n" +
+		strings.Join(lines, "\n") + "\n"
+}
+
+// profileAccount is one account the profile holds, as its preferences say it.
+type profileAccount struct {
+	Key, Server, Kind string
+	// Identities are its identities, the default first, and Addresses their addresses in that order.
+	Identities []string
+	Addresses  []string
+	Owl, Ours  bool
+}
+
+// profileAccounts reads the accounts the profile's list names, from prefs.js and user.js (user.js wins).
+func profileAccounts(prefs map[string]string) []profileAccount {
+	var out []profileAccount
+	for _, key := range listOf(prefs["mail.accountmanager.accounts"]) {
+		a := profileAccount{Key: key, Server: unquote(prefs["mail.account."+key+".server"])}
+		a.Kind = unquote(prefs["mail.server."+a.Server+".type"])
+		a.Owl = strings.HasPrefix(a.Kind, "owl")
+		a.Ours = ownKey.MatchString(key)
+		for _, id := range listOf(prefs["mail.account."+key+".identities"]) {
+			a.Identities = append(a.Identities, id)
+			a.Addresses = append(a.Addresses, unquote(prefs["mail.identity."+id+".useremail"]))
+		}
+		out = append(out, a)
+	}
+	return out
+}
+
+// mergedPrefs are a profile's preferences as Betterbird starts with them: prefs.js, then user.js over it.
+func mergedPrefs(profile string) map[string]string {
+	prefsJS, _ := readBounded(filepath.Join(profile, "prefs.js"))
+	userJS, _ := readBounded(filepath.Join(profile, "user.js"))
+	out := readPrefs(prefsJS)
+	for k, v := range readPrefs(userJS) {
+		out[k] = v
+	}
+	return out
+}
+
+// listOf reads a comma-separated list preference's value.
+func listOf(v string) []string {
+	var out []string
+	for _, k := range strings.Split(unquote(v), ",") {
+		if k = strings.TrimSpace(k); k != "" {
+			out = append(out, k)
+		}
+	}
+	return out
+}
+
+// unquote is a preference's string value without its quotes; any other value as written.
+func unquote(v string) string {
+	if s, err := strconv.Unquote(v); err == nil {
+		return s
+	}
+	return v
+}
+
+// writeAccountLists writes the module's keys into the profile's account list and list of outgoing servers
+// (§12): the declared accounts' keys added at the end, the module's keys of accounts no longer declared taken
+// out, every other key and line kept as it was. Only while Betterbird is not running. Says what changed.
+func (m *Machine) writeAccountLists(profile string, resolved []resolvedAccount) (string, error) {
+	if ps := m.mainProcs(); len(ps) > 0 {
+		return "", fmt.Errorf("Betterbird is running (pid %d), and it rewrites prefs.js when it quits: the account "+
+			"list is written at its next start from the launcher, or by betterbird_restart", ps[0].PID)
+	}
+	path := filepath.Join(profile, "prefs.js")
+	raw, err := readBounded(path)
+	if err != nil && !errors.Is(err, os.ErrNotExist) {
+		return "", err
+	}
+	var wantAccounts, wantSMTP []string
+	for _, r := range resolved {
+		if r.How == created {
+			wantAccounts, wantSMTP = append(wantAccounts, r.Keys.Account), append(wantSMTP, r.Keys.SMTP)
+		}
+	}
+	out, changed := withListed(string(raw), map[string][]string{
+		"mail.accountmanager.accounts": wantAccounts, "mail.smtpservers": wantSMTP})
+	if !changed {
+		return "unchanged", nil
+	}
+	mode := os.FileMode(0o600)
+	if st, err := os.Stat(path); err == nil {
+		mode = st.Mode().Perm()
+	}
+	tmp := path + ".mesh-new"
+	if err := os.WriteFile(tmp, []byte(out), mode); err != nil {
+		return "", err
+	}
+	if err := os.Rename(tmp, path); err != nil {
+		os.Remove(tmp)
+		return "", err
+	}
+	return fmt.Sprintf("written: %d account(s) the module created in the account list", len(wantAccounts)), nil
+}
+
+// withListed is prefs.js with each list preference holding the module's wanted keys: its own keys that are
+// not wanted taken out, the wanted ones not there added at its end, everything else as it was. A list the
+// file does not hold yet is added as a line, when anything is wanted in it.
+func withListed(text string, want map[string][]string) (string, bool) {
+	changed := false
+	done := map[string]bool{}
+	var lines []string
+	s := bufio.NewScanner(strings.NewReader(text))
+	s.Buffer(make([]byte, 64<<10), 4<<20)
+	for s.Scan() {
+		line := s.Text()
+		if mm := prefLine.FindStringSubmatch(line); mm != nil {
+			if keys, ok := want[mm[1]]; ok && !done[mm[1]] {
+				done[mm[1]] = true
+				next := listedWith(listOf(mm[2]), keys)
+				if next != strings.Join(listOf(mm[2]), ",") {
+					line = fmt.Sprintf("user_pref(%s, %s);", quoted(mm[1]), quoted(next))
+					changed = true
+				}
+			}
+		}
+		lines = append(lines, line)
+	}
+	names := make([]string, 0, len(want))
+	for n := range want {
+		names = append(names, n)
+	}
+	sort.Strings(names)
+	for _, n := range names {
+		if !done[n] && len(want[n]) > 0 {
+			lines = append(lines, fmt.Sprintf("user_pref(%s, %s);", quoted(n), quoted(strings.Join(want[n], ","))))
+			changed = true
+		}
+	}
+	out := strings.Join(lines, "\n")
+	if text == "" || strings.HasSuffix(text, "\n") {
+		out += "\n"
+	}
+	return out, changed
+}
+
+// listedWith is a list with the module's own keys made the wanted ones, every other key in its place.
+func listedWith(have, wanted []string) string {
+	want := map[string]bool{}
+	for _, k := range wanted {
+		want[k] = true
+	}
+	var out []string
+	there := map[string]bool{}
+	for _, k := range have {
+		if ownKey.MatchString(k) && !want[k] {
+			continue
+		}
+		out = append(out, k)
+		there[k] = true
+	}
+	for _, k := range wanted {
+		if !there[k] {
+			out = append(out, k)
+		}
+	}
+	return strings.Join(out, ",")
+}
+
+// AccountCount is what status and check say of the accounts: numbers, places and keys, never an address, a
+// host or a name (novox/hq ADR 0316 §16, ADR 0317 §3).
+type AccountCount struct {
+	Declared int `json:"declared"`
+	// InList are the declared accounts the profile's account list names, adopted or created.
+	InList int `json:"declared_in_the_list"`
+	// Others are the accounts the profile holds that no declaration names (the work account in Owl among them).
+	Others int `json:"other_accounts"`
+	// WithoutSignIn are the declared accounts with no sign-in kept in Betterbird's login store yet.
+	WithoutSignIn int `json:"declared_without_a_sign_in,omitempty"`
+	// Each is every declared account by its place in the setting: adopted, created or refused, and its keys.
+	Each    []resolvedAccount `json:"each,omitempty"`
+	Problem string            `json:"problem,omitempty"`
+}
+
+// countAccounts counts the declared accounts against the profile's.
+func (m *Machine) countAccounts(profile, profileDir string) AccountCount {
+	var c AccountCount
+	accounts, _, err := m.readAccounts()
+	if err != nil {
+		c.Problem = err.Error()
+		return c
+	}
+	c.Declared = len(accounts)
+	prefs := mergedPrefs(profile)
+	have := profileAccounts(prefs)
+	c.Each = resolveAccounts(accounts, prefs, m.readRecord(profileDir))
+	mine := map[string]bool{}
+	refusedN := 0
+	for _, r := range c.Each {
+		if r.How == refused {
+			refusedN++
+			continue
+		}
+		mine[r.Keys.Account] = true
+	}
+	for _, a := range have {
+		switch {
+		case mine[a.Key]:
+			c.InList++
+		case a.Kind != "none":
+			c.Others++
+		}
+	}
+	if refusedN > 0 {
+		c.Problem = fmt.Sprintf("%d declared account(s) are refused: each says why and what to do", refusedN)
+	}
+	c.WithoutSignIn = len(withoutSignIn(accounts, keptSignIns(profile)))
+	return c
+}
+
+// keptSignIns are the server names Betterbird's login store keeps a sign-in for: the `hostname` of each
+// entry of logins.json, which Betterbird writes in the clear. Nothing else of the file is read.
+func keptSignIns(profile string) map[string]bool {
+	raw, err := readBounded(filepath.Join(profile, "logins.json"))
+	out := map[string]bool{}
+	if err != nil {
+		return out
+	}
+	var store struct {
+		Logins []struct {
+			Hostname string `json:"hostname"`
+		} `json:"logins"`
+	}
+	if json.Unmarshal(raw, &store) != nil {
+		return out
+	}
+	for _, l := range store.Logins {
+		out[strings.ToLower(l.Hostname)] = true
+	}
+	return out
+}
+
+// oauthIssuers are the sign-in services of the providers whose servers sign in through OAuth, by a suffix of
+// the server's host: their kept sign-in is under the service's name, not the server's.
+var oauthIssuers = map[string]string{"gmail.com": "oauth://accounts.google.com",
+	"googlemail.com": "oauth://accounts.google.com", "office365.com": "oauth://login.microsoftonline.com",
+	"outlook.com": "oauth://login.microsoftonline.com"}
+
+// withoutSignIn are the declared accounts whose incoming server has no sign-in kept yet. A server signed in
+// to without a password (none, kerberos, ntlm, a certificate) keeps nothing and is never counted.
+func withoutSignIn(accounts map[string]Account, kept map[string]bool) []string {
+	var out []string
+	for _, name := range sortedNames(accounts) {
+		in := accounts[name].Incoming
+		switch in.SignIn {
+		case "password", "encrypted-password":
+			if !kept[strings.ToLower(in.Kind+"://"+in.Host)] {
+				out = append(out, name)
+			}
+		case "oauth":
+			issuer := ""
+			for suffix, i := range oauthIssuers {
+				if strings.HasSuffix(strings.ToLower(in.Host), suffix) {
+					issuer = i
+				}
+			}
+			found := false
+			for k := range kept {
+				if (issuer != "" && k == issuer) || (issuer == "" && strings.HasPrefix(k, "oauth://")) {
+					found = true
+				}
+			}
+			if !found {
+				out = append(out, name)
+			}
+		}
+	}
+	return out
+}
+
+// AccountsAnswer is what betterbird_accounts answers its caller: counts and kinds, never an address, a host or
+// a name (novox/hq ADR 0317 §9). The value itself goes only to the operator, in a proposal they read at
+// their own desk.
+type AccountsAnswer struct {
+	Profile string `json:"profile"`
+	// Declarable are the profile's mail accounts a declaration can hold (IMAP and POP3), by kind.
+	Declarable map[string]int `json:"declarable"`
+	// KeptByOwl are the accounts Owl keeps (the work account through Exchange): never declared (ADR 0316 §13).
+	KeptByOwl int `json:"kept_by_owl"`
+	// NotDeclarable are accounts of another kind (local folders, feeds, news, chat), by kind.
+	NotDeclarable map[string]int `json:"not_declarable,omitempty"`
+	// AlreadyDeclared are the declarable accounts under the module's own keys.
+	AlreadyDeclared int `json:"under_the_modules_keys"`
+	// Proposed is the controller's answer to the proposal, with every address and host masked.
+	Proposed string `json:"proposed,omitempty"`
+	Note     string `json:"note"`
+}
+
+// profileDeclarable reads the profile's accounts: the value a declaration of them would be, by name, and
+// what is answered of them.
+func (m *Machine) profileDeclarable() (map[string]Account, AccountsAnswer, error) {
+	p, err := m.profile()
+	if err != nil {
+		return nil, AccountsAnswer{}, err
+	}
+	prefs := mergedPrefs(p.path)
+	a := AccountsAnswer{Profile: p.Dir, Declarable: map[string]int{}, NotDeclarable: map[string]int{}}
+	value := map[string]Account{}
+	used := map[string]bool{}
+	for _, pa := range profileAccounts(prefs) {
+		switch {
+		case pa.Owl:
+			a.KeptByOwl++
+			continue
+		case pa.Kind != "imap" && pa.Kind != "pop3":
+			kind := pa.Kind
+			if kind == "none" {
+				kind = "local folders"
+			}
+			a.NotDeclarable[kind]++
+			continue
+		}
+		a.Declarable[pa.Kind]++
+		if pa.Ours {
+			a.AlreadyDeclared++
+		}
+		address := ""
+		if len(pa.Addresses) > 0 {
+			address = pa.Addresses[0]
+		}
+		name := nameFor(pa, address, used)
+		used[name] = true
+		value[name] = readAccount(prefs, pa)
+	}
+	if len(a.NotDeclarable) == 0 {
+		a.NotDeclarable = nil
+	}
+	return value, a, nil
+}
+
+// asker calls a verb of the mesh as this module, through the runtime: a variable so a test answers.
+var asker = stdio.Ask
+
+// ProfileAccounts says, by count and kind, which accounts the profile in use holds; with propose it builds
+// the setting accounts from them (every account but Owl's, without any credential) and proposes it through
+// the controller's settings verb for the operator's Approve (novox/hq ADR 0317 §9, ADR 0277). The value
+// never comes back to the caller: the operator reads it whole at their desk (`settings proposals <id>`) and
+// checks the fingerprint the ask shows.
+func (m *Machine) ProfileAccounts(propose bool) (AccountsAnswer, error) {
+	value, a, err := m.profileDeclarable()
+	if err != nil {
+		return a, err
+	}
+	a.Note = "counts and kinds only: no address, host or name leaves through this answer. With propose, the " +
+		"setting accounts is built from these accounts (never Owl's, never a password or token) and proposed to " +
+		"the operator, who reads it whole at their desk before approving (novox/hq ADR 0317 §9)"
+	if !propose {
+		return a, nil
+	}
+	if len(value) == 0 {
+		return a, errors.New("the profile holds no IMAP or POP3 account to declare: nothing was proposed")
+	}
+	var problems []string
+	for i, name := range sortedNames(value) {
+		if p := accountProblems("", name, value[name]); len(p) > 0 {
+			problems = append(problems, fmt.Sprintf("account %d of %d: %d field(s) cannot be declared as the profile "+
+				"holds them", i+1, len(value), len(p)))
+		}
+	}
+	if len(problems) > 0 {
+		return a, fmt.Errorf("nothing was proposed: %s; betterbird_prefs shows the account's preferences by name",
+			strings.Join(problems, "; "))
+	}
+	body, err := json.Marshal(map[string]any{"accounts": value})
+	if err != nil {
+		return a, err
+	}
+	raw, err := asker("seat:mesh-controller.settings", map[string]any{"module": "betterbird", "values": string(body),
+		"propose": "true"})
+	if err != nil {
+		return a, fmt.Errorf("the controller's settings verb did not answer: %v", err)
+	}
+	said, ok := verbSaid(raw)
+	a.Proposed = m.maskValue(said)
+	if !ok {
+		return a, fmt.Errorf("the controller did not take the proposal: %s", a.Proposed)
+	}
+	return a, nil
+}
+
+// verbSaid is a verb's words and whether it went ahead, whatever wraps them: the controller's {ok, output},
+// or the protocol's content list.
+func verbSaid(raw json.RawMessage) (string, bool) {
+	var s string
+	if json.Unmarshal(raw, &s) == nil {
+		return verbSaid(json.RawMessage(s))
+	}
+	var m map[string]json.RawMessage
+	if json.Unmarshal(raw, &m) != nil {
+		return string(raw), true
+	}
+	if content, has := m["content"]; has {
+		var items []struct {
+			Text string `json:"text"`
+		}
+		var e struct {
+			IsError bool `json:"isError"`
+		}
+		_ = json.Unmarshal(raw, &e)
+		if json.Unmarshal(content, &items) == nil && len(items) > 0 {
+			out, ok := verbSaid(json.RawMessage(items[0].Text))
+			return out, ok && !e.IsError
+		}
+	}
+	if okRaw, has := m["ok"]; has {
+		var ok bool
+		_ = json.Unmarshal(okRaw, &ok)
+		var output string
+		_ = json.Unmarshal(m["output"], &output)
+		return output, ok
+	}
+	return string(raw), true
+}
+
+// readAccount reads one profile account's preferences into the shape of the setting.
+func readAccount(prefs map[string]string, pa profileAccount) Account {
+	num := func(key string, def int) int {
+		if n, err := strconv.Atoi(prefs[key]); err == nil {
+			return n
+		}
+		return def
+	}
+	text := func(key string) string { return unquote(prefs[key]) }
+	srv := "mail.server." + pa.Server + "."
+	acc := Account{Incoming: Server{Kind: pa.Kind, Host: text(srv + "hostname"), User: text(srv + "userName"),
+		Security: wordFor(securities, num(srv+"socketType", 0)), SignIn: wordFor(signIns, num(srv+"authMethod", 3))}}
+	acc.Incoming.Port = num(srv+"port", defaultPort(pa.Kind, acc.Incoming.Security))
+	ids := listOf(prefs["mail.account."+pa.Key+".identities"])
+	if len(ids) > 0 {
+		id := "mail.identity." + ids[0] + "."
+		acc.Address, acc.FromName = text(id+"useremail"), text(id+"fullName")
+		smtp := text(id + "smtpServer")
+		if smtp == "" {
+			smtp = text("mail.smtp.defaultserver")
+		}
+		if smtp != "" {
+			s := "mail.smtpserver." + smtp + "."
+			acc.Outgoing = Server{Host: text(s + "hostname"), User: text(s + "username"),
+				Security: wordFor(securities, num(s+"try_ssl", 0)), SignIn: wordFor(signIns, num(s+"authMethod", 3))}
+			acc.Outgoing.Port = num(s+"port", defaultPort("smtp", acc.Outgoing.Security))
+		}
+	}
+	if label := text(srv + "name"); label != "" && label != acc.Address {
+		acc.Label = label
+	}
+	return acc
+}
+
+// nameFor is the name a profile account is answered under: its own name when the module declared it, else
+// the first label of its address's domain, made unique.
+func nameFor(pa profileAccount, address string, used map[string]bool) string {
+	if mm := ownKey.FindStringSubmatch(pa.Key); mm != nil {
+		return mm[1]
+	}
+	base := "account"
+	if _, domain, ok := strings.Cut(address, "@"); ok {
+		label, _, _ := strings.Cut(strings.ToLower(domain), ".")
+		label = regexp.MustCompile(`[^a-z0-9]`).ReplaceAllString(label, "")
+		if label != "" && label[0] >= 'a' && label[0] <= 'z' {
+			base = label
+		}
+	}
+	if len(base) > 28 {
+		base = base[:28]
+	}
+	name := base
+	for i := 2; used[name]; i++ {
+		name = base + strconv.Itoa(i)
+	}
+	return name
+}

modules/betterbird/cmd/betterbird-tools/accounts_test.go

@@ -0,0 +1,518 @@
+package main
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+)
+
+// The setting accounts (novox/hq ADR 0316 §10–§16, ADR 0317 §9 for betterbird_accounts): declared without
+// credentials, written under the module's own keys, the account list written into and never owned, refused
+// rather than duplicated, and said by count.
+
+const personal = `{"accounts": {
+  "personal": {"address": "me@mail.example.org", "from-name": "Me",
+    "incoming": {"kind": "imap", "host": "imap.example.org", "security": "tls", "sign-in": "password", "user": "me"},
+    "outgoing": {"host": "smtp.example.org", "port": 587, "security": "starttls", "sign-in": "password", "user": "me"}}
+}}`
+
+// profileWithAccounts is a profile holding an account of the person's at another address, Owl's work account,
+// local folders, and an account list in that order.
+func (f *fake) profileWithAccounts() {
+	f.betterbird()
+	f.write(profileDir+"/prefs.js", "// Mozilla User Preferences\n"+
+		`user_pref("mail.account.account1.server", "server1");`+"\n"+
+		`user_pref("mail.account.account1.identities", "id1");`+"\n"+
+		`user_pref("mail.account.account2.server", "server2");`+"\n"+
+		`user_pref("mail.account.account3.server", "server3");`+"\n"+
+		`user_pref("mail.account.account3.identities", "id3");`+"\n"+
+		`user_pref("mail.accountmanager.accounts", "account1,account3,account2");`+"\n"+
+		`user_pref("mail.identity.id1.useremail", "other@mail.example.org");`+"\n"+
+		`user_pref("mail.identity.id1.fullName", "Other");`+"\n"+
+		`user_pref("mail.identity.id1.smtpServer", "smtp1");`+"\n"+
+		`user_pref("mail.identity.id3.useremail", "work@corp.example.com");`+"\n"+
+		`user_pref("mail.server.server1.type", "imap");`+"\n"+
+		`user_pref("mail.server.server1.hostname", "imap.example.org");`+"\n"+
+		`user_pref("mail.server.server1.socketType", 3);`+"\n"+
+		`user_pref("mail.server.server1.authMethod", 10);`+"\n"+
+		`user_pref("mail.server.server1.userName", "other");`+"\n"+
+		`user_pref("mail.server.server1.directory", "/home/operator/.thunderbird/x/ImapMail/imap.example.org");`+"\n"+
+		`user_pref("mail.server.server2.type", "none");`+"\n"+
+		`user_pref("mail.server.server3.type", "owl-ews");`+"\n"+
+		`user_pref("mail.smtpserver.smtp1.hostname", "smtp.example.org");`+"\n"+
+		`user_pref("mail.smtpserver.smtp1.try_ssl", 3);`+"\n"+
+		`user_pref("mail.smtpserver.smtp1.authMethod", 10);`+"\n"+
+		`user_pref("mail.smtpserver.smtp1.username", "other");`+"\n"+
+		`user_pref("mail.smtpservers", "smtp1");`+"\n"+
+		`user_pref("mailnews.tags.version", 2);`+"\n")
+}
+
+func (f *fake) declareAccounts(body string) {
+	f.write(testHome+"/"+accountsFile, body)
+}
+
+func (f *fake) read(path string) string {
+	f.t.Helper()
+	raw, err := os.ReadFile(filepath.Join(f.Root, path))
+	if err != nil {
+		f.t.Fatal(err)
+	}
+	return string(raw)
+}
+
+func TestAnAccountsValueCarryingAPasswordLikeFieldIsRefusedWithoutItsValue(t *testing.T) {
+	for _, body := range []string{
+		`{"accounts": {"personal": {"address": "me@mail.example.org", "password": "hunter2"}}}`,
+		`{"accounts": {"personal": {"incoming": {"oauth_refresh": "1//hunter2"}}}}`,
+		`{"token": "hunter2", "accounts": {}}`,
+	} {
+		_, err := parseAccounts([]byte(body))
+		if err == nil || !strings.Contains(err.Error(), "shaped like a credential") || strings.Contains(err.Error(), "hunter2") {
+			t.Errorf("%s: %v", body, err)
+		}
+	}
+	// An unknown field is refused too, and a value that cannot be declared, said by the account's place.
+	if _, err := parseAccounts([]byte(`{"accounts": {"personal": {"address": "me@mail.example.org", "keychain": 1}}}`)); err == nil {
+		t.Error("an unknown field was taken")
+	}
+	_, err := parseAccounts([]byte(strings.Replace(personal, `"security": "tls"`, `"security": "maybe"`, 1)))
+	if err == nil || !strings.Contains(err.Error(), "declared account 1 of 1") || strings.Contains(err.Error(), "personal") ||
+		strings.Contains(err.Error(), "example.org") {
+		t.Errorf("a bad value is said by the account's place, never its name or a value: %v", err)
+	}
+}
+
+func TestTheSettingPrefsRefusesAnAccountsPreferences(t *testing.T) {
+	for _, name := range []string{"mail.account.account1.server", "mail.identity.id1.useremail", "mail.server.server1.hostname",
+		"mail.smtpserver.smtp1.hostname", "mail.accountmanager.accounts", "mail.smtpservers"} {
+		err := validUserJS(mark + ")\nuser_pref(\"" + name + "\", \"x\");\n")
+		if err == nil || !strings.Contains(err.Error(), "setting accounts") {
+			t.Errorf("%s was taken in prefs: %v", name, err)
+		}
+	}
+	if err := validUserJS(mark + ")\nuser_pref(\"calendar.alarms.show\", true);\n"); err != nil {
+		t.Fatal(err)
+	}
+}
+
+// noPackage answers pacman as a machine without the community package.
+func (f *fake) noPackage() {
+	f.answer = func(name string, args []string) Output {
+		if name == "pacman" {
+			return Output{Code: 1}
+		}
+		return Output{}
+	}
+}
+
+// userPrefLines are the user_pref lines of a user.js, by preference name.
+func userPrefLines(t *testing.T, text string) map[string]string {
+	t.Helper()
+	out := map[string]string{}
+	for _, line := range strings.Split(text, "\n") {
+		if !strings.HasPrefix(line, "user_pref(") {
+			continue
+		}
+		if !statement.MatchString(line) {
+			t.Errorf("not a statement Betterbird reads as one: %s", line)
+		}
+		out[line[len(`user_pref("`):strings.Index(line, `",`)]] = line
+	}
+	return out
+}
+
+func TestADeclaredAccountTheProfileDoesNotHoldIsCreatedUnderTheModulesKeysAndListed(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare("// none")
+	f.declareAccounts(personal)
+	// Betterbird is running: the user.js is placed, the list waits for its next start.
+	u, err := f.userJS(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !strings.HasPrefix(u.Lists, "not written") || !strings.Contains(u.Lists, "running") {
+		t.Fatalf("the list is never written while Betterbird runs: %+v", u)
+	}
+	if len(u.Each) != 1 || u.Each[0].How != created || u.Each[0].Keys != (keySet{"account_mesh_personal", "id_mesh_personal",
+		"server_mesh_personal", "smtp_mesh_personal"}) {
+		t.Fatalf("%+v", u.Each)
+	}
+	placed := f.read(profileDir + "/user.js")
+	for name := range userPrefLines(t, placed) {
+		if key := strings.Split(name, ".")[2]; !strings.HasSuffix(key, "mesh_personal") {
+			t.Errorf("a created account's preference outside the module's keys: %s", name)
+		}
+		if strings.Contains(strings.ToLower(name), "password") || strings.Contains(name, "directory") {
+			t.Errorf("the module writes no credential and none of Betterbird's own preferences: %s", name)
+		}
+	}
+	for _, want := range []string{`user_pref("mail.server.server_mesh_personal.port", 993);`,
+		`user_pref("mail.server.server_mesh_personal.socketType", 3);`,
+		`user_pref("mail.smtpserver.smtp_mesh_personal.try_ssl", 2);`,
+		`user_pref("mail.identity.id_mesh_personal.useremail", "me@mail.example.org");`} {
+		if !strings.Contains(placed, want) {
+			t.Errorf("the user.js lacks %s:\n%s", want, placed)
+		}
+	}
+
+	// Quit: the list gains the module's keys at its end, every other line as it was.
+	before := f.read(profileDir + "/prefs.js")
+	os.RemoveAll(filepath.Join(f.Root, "proc", "4000"))
+	if err := f.Prepare(); err != nil {
+		t.Fatal(err)
+	}
+	after := f.read(profileDir + "/prefs.js")
+	if !strings.Contains(after, `user_pref("mail.accountmanager.accounts", "account1,account3,account2,account_mesh_personal");`) ||
+		!strings.Contains(after, `user_pref("mail.smtpservers", "smtp1,smtp_mesh_personal");`) {
+		t.Fatalf("the lists:\n%s", after)
+	}
+	bl, al := strings.Split(before, "\n"), strings.Split(after, "\n")
+	if len(bl) != len(al) {
+		t.Fatalf("lines were added or lost: %d then %d", len(bl), len(al))
+	}
+	for i := range bl {
+		if bl[i] != al[i] && !strings.Contains(bl[i], "mail.accountmanager.accounts") && !strings.Contains(bl[i], "mail.smtpservers") {
+			t.Errorf("line %d changed: %q to %q", i+1, bl[i], al[i])
+		}
+	}
+
+	// The record lost: an account under the module's own keys is still its creation, never adopted.
+	os.Remove(filepath.Join(f.Root, testHome, recordFile))
+	u, err = f.userJS(true)
+	if err != nil || u.Each[0].How != created {
+		t.Fatalf("without the record, the module's keys still say created: %+v %v", u.Each, err)
+	}
+
+	// The account leaves the setting: only the module's keys go, the mail stays in the profile.
+	f.declareAccounts(`{"accounts": {}}`)
+	if err := f.Prepare(); err != nil {
+		t.Fatal(err)
+	}
+	if got := f.read(profileDir + "/prefs.js"); got != before {
+		t.Fatalf("removing the module's keys left the file otherwise as it was:\n%s", got)
+	}
+}
+
+// adoptable is a declaration of the profile's account1 (other@mail.example.org): equal but for its outgoing
+// port, said explicitly, and its incoming user.
+const adoptable = `{"accounts": {
+  "mail": {"address": "Other@mail.example.org",
+    "incoming": {"kind": "imap", "host": "imap.example.org", "security": "tls", "sign-in": "oauth", "user": "other2"},
+    "outgoing": {"host": "smtp.example.org", "port": 465, "security": "tls", "sign-in": "oauth", "user": "other"}}}}`
+
+func TestADeclaredAccountTheProfileHoldsIsAdoptedUnderItsOwnKeysAndTheListIsLeftAlone(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare("// none")
+	f.declareAccounts(adoptable)
+	os.RemoveAll(filepath.Join(f.Root, "proc", "4000"))
+	before := f.read(profileDir + "/prefs.js")
+	u, err := f.userJS(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(u.Each) != 1 || u.Each[0].How != adopted || u.Each[0].Keys != (keySet{"account1", "id1", "server1", "smtp1"}) {
+		t.Fatalf("adopted under the profile's keys: %+v", u.Each)
+	}
+	// The address's case and the user name differ; the default port declared explicitly is no change. Names
+	// only, no value.
+	if strings.Join(u.Each[0].Changed, ",") != "mail.identity.id1.useremail,mail.server.server1.userName" {
+		t.Fatalf("the changed preferences, by name: %v", u.Each[0].Changed)
+	}
+	if f.read(profileDir+"/prefs.js") != before || u.Lists != "unchanged" {
+		t.Fatalf("an adopted account's keys are in the lists already: nothing written to prefs.js (%s)", u.Lists)
+	}
+	lines := userPrefLines(t, f.read(profileDir+"/user.js"))
+	for name := range lines {
+		key := strings.Split(name, ".")[2]
+		if key != "account1" && key != "id1" && key != "server1" && key != "smtp1" {
+			t.Errorf("an adopted account's preference outside its keys: %s", name)
+		}
+		for _, never := range []string{"directory", ".type", "smtpServer", "identities", ".server"} {
+			if strings.HasSuffix(name, never) {
+				t.Errorf("the module wrote %s, which is Betterbird's or the account's own", name)
+			}
+		}
+	}
+	if !strings.Contains(lines["mail.server.server1.userName"], `"other2"`) {
+		t.Fatalf("the declared value wins at every start: %v", lines)
+	}
+	// The status says it by place and keys, never by address, host or name.
+	s, err := f.Status()
+	if err != nil {
+		t.Fatal(err)
+	}
+	raw, _ := json.Marshal(s.Accounts)
+	if s.Accounts.InList != 1 || s.Accounts.Others != 1 || strings.Contains(string(raw), "example") ||
+		strings.Contains(string(raw), `"mail"`) || !strings.Contains(string(raw), `"account1"`) {
+		t.Fatalf("%s", raw)
+	}
+
+	// Leaving the setting releases it: its lines and its record go, the account and the lists stay.
+	f.declareAccounts(`{"accounts": {}}`)
+	if err := f.Prepare(); err != nil {
+		t.Fatal(err)
+	}
+	if f.read(profileDir+"/prefs.js") != before || strings.Contains(f.read(profileDir+"/user.js"), "server1") ||
+		strings.Contains(f.read(testHome+"/"+recordFile), "account1") {
+		t.Fatal("a released account stays the person's, with no line or record of the module's")
+	}
+}
+
+func TestAnAmbiguousOwlsOrOtherKindOfMatchIsRefusedForThatAccountAlone(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare("// none")
+	os.RemoveAll(filepath.Join(f.Root, "proc", "4000"))
+	// A second account with account1's address.
+	prefs := f.read(profileDir + "/prefs.js")
+	prefs = strings.Replace(prefs, `"account1,account3,account2"`, `"account1,account3,account2,account4"`, 1) +
+		`user_pref("mail.account.account4.server", "server4");` + "\n" +
+		`user_pref("mail.account.account4.identities", "id4");` + "\n" +
+		`user_pref("mail.identity.id4.useremail", "other@mail.example.org");` + "\n" +
+		`user_pref("mail.identity.id4.smtpServer", "smtp4");` + "\n" +
+		`user_pref("mail.smtpserver.smtp4.hostname", "smtp.example.org");` + "\n" +
+		`user_pref("mail.server.server4.type", "imap");` + "\n"
+	f.write(profileDir+"/prefs.js", prefs)
+	both := strings.Replace(adoptable, `{"accounts": {`, `{"accounts": {
+  "zz": {"address": "new@mail.example.org",
+    "incoming": {"kind": "imap", "host": "imap.example.org", "security": "tls", "sign-in": "password"},
+    "outgoing": {"host": "smtp.example.org", "security": "tls", "sign-in": "password"}},`, 1)
+	f.declareAccounts(both)
+	err := f.Prepare()
+	if err == nil || !strings.Contains(err.Error(), "declared account 1 of 2: 2 accounts in the profile have its address (account1, account4)") ||
+		!strings.Contains(err.Error(), "key") || strings.Contains(err.Error(), "example.org") {
+		t.Fatalf("refused by place, with the matches' keys and the remedy, never the address: %v", err)
+	}
+	u, _ := f.userJS(false)
+	if u.Each[0].How != refused || u.Each[1].How != created {
+		t.Fatalf("the other declared account goes ahead: %+v", u.Each)
+	}
+	if strings.Contains(f.read(profileDir+"/user.js"), "server1") || strings.Contains(f.read(profileDir+"/user.js"), "server4") {
+		t.Fatal("a refused account gets no line")
+	}
+
+	// The node's layer names the key: that one is adopted.
+	f.declareAccounts(strings.Replace(both, `"address": "Other@mail.example.org",`, `"address": "Other@mail.example.org", "key": "account4",`, 1))
+	if err := f.Prepare(); err != nil {
+		t.Fatalf("%v", err)
+	}
+	if u, _ := f.userJS(false); u.Each[0].How != adopted || u.Each[0].Keys.Account != "account4" {
+		t.Fatalf("%+v", u.Each)
+	}
+	os.Remove(filepath.Join(f.Root, testHome, recordFile))
+	for key, want := range map[string]string{"account9": "not in the profile's account list", "account3": "Owl's",
+		"account2": "another address"} {
+		f.declareAccounts(strings.Replace(adoptable, `"address": "Other@mail.example.org",`, `"address": "Other@mail.example.org", "key": "`+key+`",`, 1))
+		if err := f.Prepare(); err == nil || !strings.Contains(err.Error(), want) {
+			t.Errorf("key %s: %v", key, err)
+		}
+	}
+
+	// Owl's account at the address, and an account of another kind than declared.
+	f.declareAccounts(`{"accounts": {"work": {"address": "work@corp.example.com",
+	  "incoming": {"kind": "imap", "host": "outlook.example.com", "security": "tls", "sign-in": "oauth"},
+	  "outgoing": {"host": "smtp.example.com", "security": "tls", "sign-in": "oauth"}}}}`)
+	if err := f.Prepare(); err == nil || !strings.Contains(err.Error(), "Owl's") {
+		t.Errorf("Owl's account is never adopted: %v", err)
+	}
+	f.write(profileDir+"/prefs.js", strings.Replace(prefs, `"mail.server.server4.type", "imap"`, `"mail.server.server4.type", "pop3"`, 1))
+	f.declareAccounts(strings.Replace(adoptable, `"address": "Other@mail.example.org",`, `"address": "Other@mail.example.org", "key": "account4",`, 1))
+	if err := f.Prepare(); err == nil || !strings.Contains(err.Error(), "never converts") {
+		t.Errorf("an account of another kind is refused, not converted: %v", err)
+	}
+}
+
+func TestDeclaredAccountsWithoutASignInAreCountedFromTheServerNamesAlone(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	links(t, nil)
+	f.declareAccounts(`{"accounts": {
+	  "personal": {"address": "me@mail.example.org", "incoming": {"kind": "imap", "host": "imap.example.org", "security": "tls", "sign-in": "password"},
+	    "outgoing": {"host": "smtp.example.org", "security": "tls", "sign-in": "password"}},
+	  "google": {"address": "me@gmail.com", "incoming": {"kind": "imap", "host": "imap.gmail.com", "security": "tls", "sign-in": "oauth"},
+	    "outgoing": {"host": "smtp.gmail.com", "security": "tls", "sign-in": "oauth"}},
+	  "lan": {"address": "me@lan.example.org", "incoming": {"kind": "pop3", "host": "pop.example.org", "security": "tls", "sign-in": "kerberos"},
+	    "outgoing": {"host": "smtp.example.org", "security": "tls", "sign-in": "none"}}}}`)
+	// The username and password fields are encrypted and never read; a fixture holding junk there proves it.
+	f.write(profileDir+"/logins.json", `{"logins": [
+	  {"hostname": "imap://imap.example.org", "httpRealm": "imap://imap.example.org", "encryptedUsername": "MEIE...", "encryptedPassword": "MDoE..."},
+	  {"hostname": "smtp://smtp.example.org", "encryptedUsername": "x", "encryptedPassword": "y"}]}`)
+	c := f.countAccounts(filepath.Join(f.Root, profileDir), "~/.thunderbird/60016jsp.default-default")
+	if c.Declared != 3 || c.WithoutSignIn != 1 || c.Others != 2 || c.InList != 0 {
+		t.Fatalf("three declared, the OAuth one not signed in, the person's and Owl's other (local folders not counted): %+v", c)
+	}
+	raw, _ := json.Marshal(c)
+	if strings.Contains(string(raw), "example") || strings.Contains(string(raw), "gmail") {
+		t.Fatalf("a count names nothing: %s", raw)
+	}
+}
+
+func TestBetterbirdAccountsAnswersCountsAndProposesTheValueWithoutOwlOrACredential(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	links(t, nil)
+	a, err := f.ProfileAccounts(false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if a.Declarable["imap"] != 1 || a.KeptByOwl != 1 || a.NotDeclarable["local folders"] != 1 || a.Proposed != "" {
+		t.Fatalf("%+v", a)
+	}
+	raw, _ := json.Marshal(a)
+	for _, never := range []string{"example", "other", "Other", "work@", "smtp1"} {
+		if strings.Contains(string(raw), never) {
+			t.Errorf("the answer to the caller names %q: %s", never, raw)
+		}
+	}
+
+	var asked map[string]any
+	asker = func(key string, body any) (json.RawMessage, error) {
+		if key != "seat:mesh-controller.settings" {
+			t.Fatalf("asked %s", key)
+		}
+		asked = body.(map[string]any)
+		return json.RawMessage(`{"ok": true, "output": "proposed p-17 for betterbird on the whole mesh: accounts (other@mail.example.org); fingerprint ab12"}`), nil
+	}
+	t.Cleanup(func() { asker = nil })
+	a, err = f.ProfileAccounts(true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if asked["module"] != "betterbird" || asked["propose"] != "true" || asked["node"] != nil {
+		t.Fatalf("proposed for the whole mesh, never set: %v", asked)
+	}
+	value, err := parseAccounts([]byte(asked["values"].(string)))
+	if err != nil {
+		t.Fatalf("the proposed value is one the module takes: %v", err)
+	}
+	other, ok := value["mail"]
+	if len(value) != 1 || !ok || other.Address != "other@mail.example.org" || other.Incoming.SignIn != "oauth" ||
+		other.Incoming.Port != 993 || other.Outgoing.Security != "tls" || other.Outgoing.Port != 465 {
+		t.Fatalf("the value holds the person's account and not Owl's: %+v", value)
+	}
+	if strings.Contains(a.Proposed, "other@") || !strings.Contains(a.Proposed, "p-17") {
+		t.Fatalf("the controller's words come back with every address masked: %s", a.Proposed)
+	}
+}
+
+func TestAnAdoptedAccountNeverWritesIntoAnOutgoingServerAnotherIdentityUses(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare("// none")
+	os.RemoveAll(filepath.Join(f.Root, "proc", "4000"))
+	// A second account of the person's, not declared, sends through smtp1 too.
+	prefs := strings.Replace(f.read(profileDir+"/prefs.js"), `"account1,account3,account2"`, `"account1,account3,account2,account5"`, 1) +
+		`user_pref("mail.account.account5.server", "server5");` + "\n" +
+		`user_pref("mail.account.account5.identities", "id5");` + "\n" +
+		`user_pref("mail.identity.id5.useremail", "fifth@mail.example.org");` + "\n" +
+		`user_pref("mail.identity.id5.smtpServer", "smtp1");` + "\n" +
+		`user_pref("mail.server.server5.type", "imap");` + "\n"
+	f.write(profileDir+"/prefs.js", prefs)
+	f.declareAccounts(adoptable)
+	err := f.Prepare()
+	if err == nil || !strings.Contains(err.Error(), "also used by identity id5") || strings.Contains(err.Error(), "example.org") {
+		t.Fatalf("refused with the remedy, by keys: %v", err)
+	}
+	if user, _ := os.ReadFile(filepath.Join(f.Root, profileDir, "user.js")); strings.Contains(string(user), "smtpserver.smtp1") {
+		t.Fatal("the shared outgoing server was written")
+	}
+
+	// Recorded adoption, then the person moves the identity to a server of its own: the module follows it.
+	f.write(profileDir+"/prefs.js", strings.Replace(prefs, `"mail.identity.id5.smtpServer", "smtp1"`, `"mail.identity.id5.smtpServer", "smtp5"`, 1))
+	if err := f.Prepare(); err != nil {
+		t.Fatal(err)
+	}
+	moved := strings.Replace(f.read(profileDir+"/prefs.js"), `"mail.identity.id1.smtpServer", "smtp1"`, `"mail.identity.id1.smtpServer", "smtp9"`, 1) +
+		`user_pref("mail.smtpserver.smtp9.hostname", "smtp.example.org");` + "\n"
+	f.write(profileDir+"/prefs.js", moved)
+	u, err := f.userJS(true)
+	if err != nil || u.Each[0].How != adopted || u.Each[0].Keys.SMTP != "smtp9" {
+		t.Fatalf("the identity's current outgoing server is followed: %+v %v", u.Each, err)
+	}
+	user := f.read(profileDir + "/user.js")
+	if strings.Contains(user, "smtpserver.smtp1.") || !strings.Contains(user, "smtpserver.smtp9.hostname") {
+		t.Fatalf("never the old one:\n%s", user)
+	}
+	// And the move back onto a shared server is refused again.
+	f.write(profileDir+"/prefs.js", strings.Replace(moved, `"mail.identity.id5.smtpServer", "smtp5"`, `"mail.identity.id5.smtpServer", "smtp9"`, 1))
+	if err := f.Prepare(); err == nil || !strings.Contains(err.Error(), "also used by identity id5") {
+		t.Fatalf("%v", err)
+	}
+}
+
+func TestTheUserJSAnswerWithholdsTheAccountsValues(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare(`user_pref("mail.compose.default_to", "x");`)
+	f.declareAccounts(personal)
+	u, err := f.userJS(false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for _, never := range []string{"example.org", `"me"`, `"Me"`} {
+		if strings.Contains(u.Content, never) {
+			t.Errorf("the answer carries %s:\n%s", never, u.Content)
+		}
+	}
+	if !strings.Contains(u.Content, `user_pref("mail.server.server_mesh_personal.hostname", "<withheld>");`) {
+		t.Fatalf("an account's preference is named and its value withheld:\n%s", u.Content)
+	}
+	// What is placed in the profile keeps the values: only the answer withholds them.
+	if f.read(testHome+"/"+accountsFile) == "" {
+		t.Fatal("no declaration")
+	}
+}
+
+func TestACredentialRefusalNamesNoAccount(t *testing.T) {
+	_, err := parseAccounts([]byte(`{"accounts": {"personal": {"incoming": {"password": "hunter2"}}}}`))
+	if err == nil || strings.Contains(err.Error(), "personal") || !strings.Contains(err.Error(), "accounts.<an account>.incoming.password") {
+		t.Fatalf("%v", err)
+	}
+}
+
+func TestAnAccountsOwnAliasesAndNonMailIdentitiesDoNotShareItsOutgoingServer(t *testing.T) {
+	f := newFake(t)
+	f.profileWithAccounts()
+	f.noPackage()
+	links(t, nil)
+	f.declare("// none")
+	os.RemoveAll(filepath.Join(f.Root, "proc", "4000"))
+	// account1 has an alias identity on smtp1; smtp1 is the default server; Owl's account and local folders
+	// have identities that name no outgoing server.
+	prefs := strings.Replace(f.read(profileDir+"/prefs.js"), `"mail.account.account1.identities", "id1"`, `"mail.account.account1.identities", "id1,id1b"`, 1)
+	prefs = strings.Replace(prefs, `"mail.account.account2.server", "server2");`, `"mail.account.account2.server", "server2");`+"\n"+
+		`user_pref("mail.account.account2.identities", "id2");`, 1) +
+		`user_pref("mail.identity.id1b.useremail", "alias@mail.example.org");` + "\n" +
+		`user_pref("mail.identity.id1b.smtpServer", "smtp1");` + "\n" +
+		`user_pref("mail.identity.id2.useremail", "local@mail.example.org");` + "\n" +
+		`user_pref("mail.smtp.defaultserver", "smtp1");` + "\n"
+	f.write(profileDir+"/prefs.js", prefs)
+	f.declareAccounts(adoptable)
+	if err := f.Prepare(); err != nil {
+		t.Fatalf("an account's own alias, and identities that do not send by SMTP, are no sharing: %v", err)
+	}
+	// An identity of another mail account naming no server does use the default one.
+	f.write(profileDir+"/prefs.js", strings.Replace(prefs, `"account1,account3,account2"`, `"account1,account3,account2,account6"`, 1)+
+		`user_pref("mail.account.account6.server", "server6");`+"\n"+
+		`user_pref("mail.account.account6.identities", "id6");`+"\n"+
+		`user_pref("mail.identity.id6.useremail", "six@mail.example.org");`+"\n"+
+		`user_pref("mail.server.server6.type", "pop3");`+"\n")
+	os.Remove(filepath.Join(f.Root, testHome, recordFile))
+	if err := f.Prepare(); err == nil || !strings.Contains(err.Error(), "also used by identity id6") {
+		t.Fatalf("%v", err)
+	}
+}

modules/betterbird/cmd/betterbird-tools/adoption.go

@@ -0,0 +1,330 @@
+package main
+
+// Which account of the profile a declared account is (novox/hq ADR 0317): adopted, created or refused.
+//
+// At every apply, per declared account in its place in the setting (§1):
+//
+//  1. an account the module recorded on this node for this profile, adopted or created, is kept by its
+//     recorded keys without matching again, while its account key is still in the profile's account list;
+//  2. otherwise an account under the module's own mesh_<name> keys is the module's creation;
+//  3. otherwise a node's layer may name the key to adopt (§8): adopted only when it is in the account list,
+//     its default identity has the declared address and it is not Owl's;
+//  4. otherwise the profile's accounts whose default identity has the declared address: one is adopted, none
+//     means the account is created under mesh_<name> keys (ADR 0316 §11).
+//
+// Refused, with the remedy, for that account alone (§7): two or more accounts with the address, the one that
+// has it being Owl's, a named key that does not qualify, an account of another kind than the declaration says
+// (the module never converts one: the review of ADR 0317), and an identity that names no outgoing server. The
+// other declared accounts go ahead.
+//
+// Adopting takes the account's keys as the module's (§2): its account key, its default identity, its incoming
+// server and the outgoing server that identity names. The account lists are left as they are, because the keys
+// are in them already; the declared fields are written under those keys (§4, §5). What was adopted or created
+// is recorded in the module's directory in the home, by the tools and never by a setting (§3); leaving the
+// setting releases an adopted account (its lines and its record go, the account stays the person's, §6).
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+// recordFile is where the module records, per profile, what it adopted or created (ADR 0317 §3).
+const recordFile = ".config/betterbird/accounts-record.json"
+
+// How a declared account resolved.
+const (
+	adopted = "adopted"
+	created = "created"
+	refused = "refused"
+)
+
+// keySet are an account's four keys.
+type keySet struct {
+	Account  string `json:"account"`
+	Identity string `json:"identity"`
+	Server   string `json:"server"`
+	SMTP     string `json:"smtp"`
+}
+
+// resolvedAccount is one declared account as it resolved, said by its place and keys, never its name, address
+// or host (ADR 0316 §16, ADR 0317 §3).
+type resolvedAccount struct {
+	Place int    `json:"place"`
+	How   string `json:"how"`
+	Keys  keySet `json:"keys,omitempty"`
+	// Why is a refusal's reason and its remedy.
+	Why string `json:"why,omitempty"`
+	// Changed are the preferences an apply changed for it, by name only (ADR 0317 §4).
+	Changed []string `json:"changed,omitempty"`
+	name    string
+}
+
+// record is what the module adopted or created, per profile (its directory as the tools say it), per
+// declared account's name.
+type record map[string]map[string]recorded
+
+type recorded struct {
+	How  string `json:"how"`
+	Keys keySet `json:"keys"`
+}
+
+func (m *Machine) readRecord(profileDir string) map[string]recorded {
+	raw, err := readBounded(m.home(recordFile))
+	if err != nil {
+		return map[string]recorded{}
+	}
+	var r record
+	if json.Unmarshal(raw, &r) != nil || r[profileDir] == nil {
+		return map[string]recorded{}
+	}
+	return r[profileDir]
+}
+
+// writeRecord keeps what this apply resolved for the profile: a refused account is not recorded, and an
+// account no longer declared is dropped (§6).
+func (m *Machine) writeRecord(profileDir string, resolved []resolvedAccount) error {
+	r := record{}
+	if raw, err := readBounded(m.home(recordFile)); err == nil {
+		_ = json.Unmarshal(raw, &r)
+	}
+	mine := map[string]recorded{}
+	for _, a := range resolved {
+		if a.How != refused {
+			mine[a.name] = recorded{How: a.How, Keys: a.Keys}
+		}
+	}
+	if len(mine) == 0 {
+		delete(r, profileDir)
+	} else {
+		r[profileDir] = mine
+	}
+	body, err := json.MarshalIndent(r, "", "  ")
+	if err != nil {
+		return err
+	}
+	path := m.home(recordFile)
+	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
+		return err
+	}
+	tmp := path + ".mesh-new"
+	if err := os.WriteFile(tmp, append(body, '\n'), 0o600); err != nil {
+		return err
+	}
+	if err := os.Rename(tmp, path); err != nil {
+		os.Remove(tmp)
+		return err
+	}
+	return nil
+}
+
+// resolveAccounts resolves every declared account, in its place in the setting (the file's order, by name).
+func resolveAccounts(accounts map[string]Account, prefs map[string]string, rec map[string]recorded) []resolvedAccount {
+	have := profileAccounts(prefs)
+	inList := map[string]profileAccount{}
+	for _, a := range have {
+		inList[a.Key] = a
+	}
+	names := sortedNames(accounts)
+	taken := map[string]bool{}
+	var out []resolvedAccount
+	for i, name := range names {
+		r := resolveOne(i+1, len(names), name, accounts[name], prefs, have, inList, rec, taken)
+		r.name = name
+		if r.How != refused {
+			taken[r.Keys.Account] = true
+		}
+		out = append(out, r)
+	}
+	return refuseSharedOutgoing(out, prefs, have)
+}
+
+// refuseSharedOutgoing refuses an adopted account whose outgoing server another identity uses that is neither
+// adopted nor the module's (review 34 of mesh-catalog #232): Betterbird lets identities share an outgoing
+// server, and the declared values written into it would change that other account's sending at every start.
+// ADR 0317 §2 adopts the outgoing server the identity names and leaves the lists as they are, so the module
+// does not give the identity a server of its own; it refuses, with the remedy.
+func refuseSharedOutgoing(resolved []resolvedAccount, prefs map[string]string, have []profileAccount) []resolvedAccount {
+	// Every identity of an adopted or created account is its own, its aliases too (review 36).
+	accountOf := map[string]profileAccount{}
+	kindOf := map[string]string{}
+	for _, a := range have {
+		accountOf[a.Key] = a
+		for _, id := range a.Identities {
+			kindOf[id] = a.Kind
+		}
+	}
+	ours := map[string]bool{}
+	for _, r := range resolved {
+		if r.How == refused {
+			continue
+		}
+		ours[r.Keys.Identity] = true
+		for _, id := range accountOf[r.Keys.Account].Identities {
+			ours[id] = true
+		}
+	}
+	defaultServer := unquote(prefs["mail.smtp.defaultserver"])
+	users := map[string][]string{}
+	seen := map[string]bool{}
+	use := func(id string) {
+		if seen[id] || ours[id] {
+			return
+		}
+		seen[id] = true
+		server := unquote(prefs["mail.identity."+id+".smtpServer"])
+		// Only a mail account's identity sends through the default server when it names none: Owl's, local
+		// folders and feeds do not send by SMTP (review 36).
+		if server == "" && (kindOf[id] == "imap" || kindOf[id] == "pop3") {
+			server = defaultServer
+		}
+		if server != "" {
+			users[server] = append(users[server], id)
+		}
+	}
+	for _, a := range have {
+		for _, id := range a.Identities {
+			use(id)
+		}
+	}
+	for k := range prefs {
+		if strings.HasPrefix(k, "mail.identity.") && strings.HasSuffix(k, ".smtpServer") {
+			use(strings.TrimSuffix(strings.TrimPrefix(k, "mail.identity."), ".smtpServer"))
+		}
+	}
+	for i, r := range resolved {
+		if r.How != adopted {
+			continue
+		}
+		if others := users[r.Keys.SMTP]; len(others) > 0 {
+			sort.Strings(others)
+			resolved[i] = resolvedAccount{Place: r.Place, How: refused, name: r.name, Why: fmt.Sprintf(
+				"declared account %d of %d: the outgoing server %s of the profile's account %s is also used by "+
+					"identity %s, whose sending the declared values would change: give the account an outgoing "+
+					"server of its own in Betterbird's account settings, then start Betterbird again",
+				r.Place, len(resolved), r.Keys.SMTP, r.Keys.Account, strings.Join(others, ", "))}
+		}
+	}
+	return resolved
+}
+
+func resolveOne(place, of int, name string, a Account, prefs map[string]string, have []profileAccount,
+	inList map[string]profileAccount, rec map[string]recorded, taken map[string]bool) resolvedAccount {
+	r := resolvedAccount{Place: place}
+	refuse := func(format string, args ...any) resolvedAccount {
+		r.How, r.Keys = refused, keySet{}
+		r.Why = fmt.Sprintf("declared account %d of %d: ", place, of) + fmt.Sprintf(format, args...)
+		return r
+	}
+	// 1. Recorded, while its account is still in the list.
+	if was, ok := rec[name]; ok {
+		if _, there := inList[was.Keys.Account]; there || was.How == created {
+			r.How, r.Keys = was.How, was.Keys
+			if was.How == adopted {
+				// The identity's outgoing server as it is now: a person may have moved it since.
+				smtpKey := unquote(prefs["mail.identity."+was.Keys.Identity+".smtpServer"])
+				if smtpKey == "" {
+					return refuse("the profile's account %s has an identity that names no outgoing server: choose one "+
+						"for it in Betterbird's account settings, then start Betterbird again", was.Keys.Account)
+				}
+				r.Keys.SMTP = smtpKey
+			}
+			return r
+		}
+	}
+	// 2. Under the module's own keys: its creation.
+	account, identity, server, smtp := keysOf(name)
+	own := keySet{account, identity, server, smtp}
+	if _, there := inList[account]; there {
+		r.How, r.Keys = created, own
+		return r
+	}
+	adopt := func(pa profileAccount) resolvedAccount {
+		if pa.Kind != a.Incoming.Kind {
+			return refuse("the profile's account %s is of kind %s and the declaration says %s: the module never "+
+				"converts an account. Declare the kind the account has, or remove the account in Betterbird",
+				pa.Key, pa.Kind, a.Incoming.Kind)
+		}
+		smtpKey := unquote(prefs["mail.identity."+pa.Identities[0]+".smtpServer"])
+		if smtpKey == "" {
+			return refuse("the profile's account %s has an identity that names no outgoing server: choose one for it "+
+				"in Betterbird's account settings, then start Betterbird again", pa.Key)
+		}
+		r.How, r.Keys = adopted, keySet{pa.Key, pa.Identities[0], pa.Server, smtpKey}
+		return r
+	}
+	matchesDefault := func(pa profileAccount) bool {
+		return len(pa.Addresses) > 0 && strings.EqualFold(pa.Addresses[0], a.Address)
+	}
+	// 3. The key a node's layer names.
+	if a.Key != "" {
+		pa, there := inList[a.Key]
+		switch {
+		case !there:
+			return refuse("the key %s this node's layer names is not in the profile's account list", a.Key)
+		case pa.Owl:
+			return refuse("the key %s this node's layer names is Owl's account, which is never declared "+
+				"(novox/hq ADR 0316 §13)", a.Key)
+		case !matchesDefault(pa):
+			return refuse("the key %s this node's layer names is an account whose default identity has another "+
+				"address", a.Key)
+		case taken[pa.Key]:
+			return refuse("the key %s is already another declared account's", a.Key)
+		}
+		return adopt(pa)
+	}
+	// 4. By the default identity's address.
+	var matches []profileAccount
+	for _, pa := range have {
+		if !pa.Ours && !taken[pa.Key] && matchesDefault(pa) {
+			matches = append(matches, pa)
+		}
+	}
+	switch {
+	case len(matches) == 0:
+		r.How, r.Keys = created, own
+		return r
+	case len(matches) > 1:
+		var keys []string
+		for _, pa := range matches {
+			keys = append(keys, pa.Key)
+		}
+		return refuse("%d accounts in the profile have its address (%s): remove the duplicate in Betterbird, or "+
+			"give the one to adopt as key in this node's layer of the setting accounts (novox/hq ADR 0317 §7, §8)",
+			len(matches), strings.Join(keys, ", "))
+	case matches[0].Owl:
+		return refuse("the profile's account with its address, %s, is Owl's, which is never declared (novox/hq "+
+			"ADR 0316 §13): take it out of the setting accounts", matches[0].Key)
+	}
+	return adopt(matches[0])
+}
+
+// changedPrefs are the preferences of a resolved account whose declared value differs from the profile's
+// saved one (prefs.js), by name only (ADR 0317 §4). A preference prefs.js does not hold is changed unless the
+// declared value is what Betterbird reads in its place.
+func changedPrefs(r resolvedAccount, a Account, saved map[string]string) []string {
+	defaults := map[string]string{}
+	if r.How == adopted {
+		// What Betterbird reads when prefs.js holds no value: the same defaults betterbird_accounts reads with.
+		pa := profileAccount{Key: r.Keys.Account, Server: r.Keys.Server, Kind: a.Incoming.Kind,
+			Identities: []string{r.Keys.Identity}}
+		view := readAccount(saved, pa)
+		for _, p := range declaredPrefs(r.Keys, view, true) {
+			defaults[p[0]] = p[1]
+		}
+	}
+	var out []string
+	for _, p := range declaredPrefs(r.Keys, a, r.How == adopted) {
+		have, ok := saved[p[0]]
+		if !ok {
+			have, ok = defaults[p[0]]
+		}
+		if !ok || have != p[1] {
+			out = append(out, p[0])
+		}
+	}
+	return out
+}

modules/betterbird/cmd/betterbird-tools/betterbird.go

@@ -10,19 +10,23 @@ package main
 //     (passwordSecret, accountPrefix);
 //   - the profile's extensions.json, for the add-ons' ids and whether each is on;
 //   - the module's declared user.js (~/.config/betterbird/user.js), which the node-engine writes from
-//     the module's setting `prefs`.
+//     the module's setting `prefs`, and its declared accounts (~/.config/betterbird/accounts.json, the
+//     setting `accounts`, accounts.go);
+//   - of logins.json, only the server name each kept sign-in is for, which Betterbird keeps in the clear,
+//     to count the declared accounts that have not signed in yet (novox/hq ADR 0316 §16).
 //
-// Never read: the mail store, the address books, logins.json, key4.db, cert9.db, cookies, the
-// calendar's caches. Nothing of the operator's mail, calendar or accounts is answered.
+// Never read: the mail store, the address books, a user name or password in logins.json, key4.db,
+// cert9.db, cookies, the calendar's caches. Nothing of the operator's mail or calendar is answered, and of
+// their accounts only counts and kinds.
 //
-// The one file a tool writes in the profile is user.js, and only the module's own: the declared file,
-// copied whole (betterbird_user_js with apply, betterbird_restart). A user.js that is not the module's
-// is never overwritten.
+// The files a tool writes in the profile are user.js, and only the module's own (the declared file and
+// the declared accounts' preferences, betterbird_user_js with apply, betterbird_restart, and the start
+// from the launcher), and the module's own keys in the account lists of prefs.js, only while Betterbird is
+// not running (accounts.go). A user.js that is not the module's is never overwritten.
 
 import (
 	"bufio"
 	"bytes"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"os"
@@ -35,8 +39,12 @@ import (
 )
 
 const (
-	mainComm   = "betterbird-bin"
-	startBin   = "/usr/bin/betterbird"
+	mainComm = "betterbird-bin"
+	// startBin is Betterbird itself, where the mesh's release and the community package both put it. The
+	// module's start (/usr/local/bin/betterbird) runs the preparation first; a tool that starts Betterbird
+	// prepares itself and starts this.
+	startBin = installDir + "/betterbird"
+	// packageFor is the community package the mesh's release replaces (novox/hq ADR 0316 §4).
 	packageFor = "betterbird-bin"
 	appIni     = "/opt/betterbird/application.ini"
 	restartAs  = "mesh-betterbird"
@@ -262,6 +270,11 @@ var (
 	allowedExtensions = map[string]bool{"extensions.activeThemeID": true}
 )
 
+// accountOwned are the preferences of an account and of the account lists: the setting accounts' alone, so
+// the setting prefs refuses them and an account has one owner (novox/hq ADR 0316 §11).
+var accountOwned = []string{"mail.account.", "mail.identity.", "mail.server.", "mail.smtpserver.",
+	"mail.accountmanager.", "mail.smtpservers", "mail.smtp.defaultserver"}
+
 // withheld says why a preference's value is never answered, or "" when it may be.
 func withheld(name string) string {
 	if strings.HasPrefix(name, "extensions.") && !allowedExtensions[name] {
@@ -392,6 +405,12 @@ func validUserJS(text string) error {
 			if passwordSecret.MatchString(name) {
 				return fmt.Errorf("line %d sets %s, a preference that can hold a credential: not through the mesh", i+1, name)
 			}
+			for _, p := range accountOwned {
+				if strings.HasPrefix(name, p) {
+					return fmt.Errorf("line %d sets %s, an account's preference: an account is declared in the setting "+
+						"accounts, never in prefs (novox/hq ADR 0316 §11)", i+1, name)
+				}
+			}
 		}
 	}
 	return nil
@@ -433,13 +452,35 @@ type UserJS struct {
 	Effective string `json:"effective,omitempty"`
 	Content   string `json:"content,omitempty"`
 	Applied   bool   `json:"applied,omitempty"`
+	// Accounts are how many accounts the setting accounts declares, and what is wrong with them.
+	Accounts        int    `json:"declared_accounts"`
+	AccountsProblem string `json:"accounts_problem,omitempty"`
+	// Each is every declared account by its place: adopted, created or refused (with why), its keys, and the
+	// preferences an apply changed for it, by name (novox/hq ADR 0317 §3, §4).
+	Each []resolvedAccount `json:"accounts,omitempty"`
+	// Lists says whether the keys of the accounts the module created were written into the account lists.
+	Lists string `json:"account_lists,omitempty"`
 }
 
-// userJS compares the declared user.js with the profile's; apply places the declared one when the
-// profile has none or the module's.
+// refusedAccounts are the reasons of the declared accounts that were refused.
+func (u UserJS) refusedAccounts() []string {
+	var out []string
+	for _, r := range u.Each {
+		if r.How == refused {
+			out = append(out, r.Why)
+		}
+	}
+	return out
+}
+
+// userJS compares the user.js the module places — the declared file, then the declared accounts' fields under
+// the keys each was adopted or created under (adoption.go) — with the profile's; apply places it when the
+// profile has none or the module's, records what was adopted or created, and writes the keys of the accounts
+// it created into the profile's account lists when Betterbird is not running. A refused account gets nothing;
+// the others go ahead (novox/hq ADR 0317 §7).
 func (m *Machine) userJS(apply bool) (UserJS, error) {
 	a := UserJS{Declared: "~/" + declared}
-	want, err := readBounded(m.home(declared))
+	declaredText, err := readBounded(m.home(declared))
 	a.Present = err == nil
 	p, perr := m.profile()
 	if perr != nil {
@@ -447,11 +488,21 @@ func (m *Machine) userJS(apply bool) (UserJS, error) {
 	}
 	target := filepath.Join(p.path, "user.js")
 	a.Profile = m.tilde(strings.TrimPrefix(target, m.Root))
+	accounts, _, aerr := m.readAccounts()
+	if aerr != nil {
+		a.AccountsProblem = aerr.Error()
+		accounts = nil
+	} else {
+		a.Accounts = len(accounts)
+		a.Each = resolveAccounts(accounts, mergedPrefs(p.path), m.readRecord(p.Dir))
+	}
+	var want []byte
 	if a.Present {
-		if verr := validUserJS(string(want)); verr != nil {
+		if verr := validUserJS(string(declaredText)); verr != nil {
 			a.Valid = verr.Error()
 		}
-		a.Content = string(want)
+		want = []byte(composeUserJS(string(declaredText), accounts, a.Each))
+		a.Content = m.answeredUserJS(string(want))
 		for _, line := range strings.Split(string(want), "\n") {
 			for _, st := range splitStatements(strings.TrimSpace(line)) {
 				if statement.MatchString(st) {
@@ -477,6 +528,17 @@ func (m *Machine) userJS(apply bool) (UserJS, error) {
 			return a, fmt.Errorf("the module's user.js is not on this machine (~/%s): the module is not pushed here yet", declared)
 		case a.Valid != "":
 			return a, fmt.Errorf("the module's user.js is refused: %s; change the setting prefs", a.Valid)
+		case a.AccountsProblem != "":
+			return a, fmt.Errorf("nothing was placed: %s", a.AccountsProblem)
+		}
+		saved, _ := readBounded(filepath.Join(p.path, "prefs.js"))
+		savedPrefs := readPrefs(saved)
+		for i, r := range a.Each {
+			if r.How != refused {
+				a.Each[i].Changed = changedPrefs(r, accounts[r.name], savedPrefs)
+			}
+		}
+		switch {
 		case herr == nil && !bytes.HasPrefix(have, []byte(mark)):
 			return a, fmt.Errorf("%s is not the module's: move it aside (its preferences belong in the setting prefs), then apply again", a.Profile)
 		}
@@ -491,6 +553,14 @@ func (m *Machine) userJS(apply bool) (UserJS, error) {
 			}
 		}
 		a.Applied, a.Placed = true, "the module's, as declared"
+		if err := m.writeRecord(p.Dir, a.Each); err != nil {
+			return a, fmt.Errorf("the user.js is placed, and what was adopted or created could not be recorded: %v", err)
+		}
+		if lists, err := m.writeAccountLists(p.path, a.Each); err != nil {
+			a.Lists = "not written: " + err.Error()
+		} else {
+			a.Lists = lists
+		}
 	}
 	if ps := m.mainProcs(); len(ps) > 0 {
 		if st, err := os.Stat(target); err == nil {
@@ -504,27 +574,74 @@ func (m *Machine) userJS(apply bool) (UserJS, error) {
 	return a, nil
 }
 
+// answeredUserJS is the user.js as a tool answers it (novox/hq ADR 0316 §16, ADR 0317 §9): an account's
+// preferences with their values withheld, every other value masked as betterbird_prefs masks it.
+func (m *Machine) answeredUserJS(text string) string {
+	lines := strings.Split(text, "\n")
+	for i, line := range lines {
+		for _, st := range splitStatements(strings.TrimSpace(line)) {
+			mm := prefLine.FindStringSubmatch(st)
+			if mm == nil {
+				continue
+			}
+			value := m.maskValue(mm[2])
+			if why := withheld(mm[1]); why != "" {
+				value = `"<withheld>"`
+			}
+			lines[i] = fmt.Sprintf("user_pref(%s, %s);", quoted(mm[1]), value)
+		}
+	}
+	return strings.Join(lines, "\n")
+}
+
+// Prepare is what the module's start runs before Betterbird (`betterbird-tools prepare`): with no Betterbird
+// of this account running, the user.js placed and the declared accounts written into the account lists. With
+// one running it does nothing, since the start then only hands over to it. Its error is said by the start,
+// which starts Betterbird either way.
+func (m *Machine) Prepare() error {
+	if len(m.mainProcs()) > 0 {
+		return nil
+	}
+	u, err := m.userJS(true)
+	if err != nil {
+		return err
+	}
+	var problems []string
+	if strings.HasPrefix(u.Lists, "not written") {
+		problems = append(problems, "the account lists were "+u.Lists)
+	}
+	problems = append(problems, u.refusedAccounts()...)
+	if len(problems) > 0 {
+		return fmt.Errorf("%s", strings.Join(problems, "; "))
+	}
+	return nil
+}
+
 // Status is what betterbird_status answers.
 type Status struct {
-	Running   []Proc   `json:"running"`
-	Children  int      `json:"children"`
-	Installed string   `json:"installed,omitempty"`
+	Running  []Proc `json:"running"`
+	Children int    `json:"children"`
+	// Installation is what is installed and from where, the policy and Owl (novox/hq ADR 0316 §16).
+	Installation Installation `json:"installation"`
+	// Installed is the community package's version, while it is still there.
+	Installed string   `json:"community_package,omitempty"`
 	Foreign   bool     `json:"from_the_aur,omitempty"`
-	Version   string   `json:"version,omitempty"`
-	Build     string   `json:"build,omitempty"`
 	Profile   *Profile `json:"profile,omitempty"`
 	Problem   string   `json:"profile_problem,omitempty"`
 	Output    []Stream `json:"output,omitempty"`
 	UserJS    *UserJS  `json:"user_js,omitempty"`
-	AddOns    []AddOn  `json:"add_ons,omitempty"`
+	// Accounts are counts: the declared, those in the profile's list, the others, those without a sign-in.
+	Accounts *AccountCount `json:"accounts,omitempty"`
+	AddOns   []AddOn       `json:"add_ons,omitempty"`
 	// Display are the preferences that decide how its windows and notifications look.
 	Display []Pref `json:"display_prefs,omitempty"`
 }
 
 // AddOn is one add-on the operator installed: its id, and whether it is on.
 type AddOn struct {
-	ID     string `json:"id"`
-	Active bool   `json:"active"`
+	ID      string `json:"id"`
+	Version string `json:"version,omitempty"`
+	Active  bool   `json:"active"`
 }
 
 // displayPrefs are the preferences betterbird_status answers: the reminder dialog, the theme, the
@@ -550,39 +667,24 @@ func (m *Machine) Status() (Status, error) {
 	if v, err := m.installed(packageFor); err == nil && v != "" {
 		s.Installed, s.Foreign = v, m.foreign(packageFor)
 	}
-	if raw, err := readBounded(m.path(appIni)); err == nil {
-		_, sec := iniSections(raw)
-		s.Version, s.Build = sec["App"]["Version"], sec["App"]["BuildID"]
-	}
 	if len(s.Running) > 0 {
 		s.Output = m.streams(s.Running[0].PID)
 	}
 	p, err := m.profile()
 	if err != nil {
+		s.Installation = m.installation("")
 		s.Problem = err.Error()
 		return s, nil
 	}
 	s.Profile = &p
+	s.Installation = m.installation(p.path)
 	if u, err := m.userJS(false); err == nil {
 		u.Content = ""
 		s.UserJS = &u
 	}
-	if raw, err := readBounded(filepath.Join(p.path, "extensions.json")); err == nil {
-		var ext struct {
-			Addons []struct {
-				ID       string `json:"id"`
-				Active   bool   `json:"active"`
-				Location string `json:"location"`
-			} `json:"addons"`
-		}
-		if json.Unmarshal(raw, &ext) == nil {
-			for _, a := range ext.Addons {
-				if a.Location == "app-profile" {
-					s.AddOns = append(s.AddOns, AddOn{a.ID, a.Active})
-				}
-			}
-		}
-	}
+	c := m.countAccounts(p.path, p.Dir)
+	s.Accounts = &c
+	s.AddOns = addOns(p.path)
 	if got, err := m.Prefs(displayPrefs); err == nil {
 		s.Display = got["prefs"].([]Pref)
 	}
@@ -711,7 +813,8 @@ func (m *Machine) Restart(discard bool) (RestartAnswer, error) {
 	if u, err := m.userJS(true); err != nil {
 		a.UserJS = "not placed: " + err.Error()
 	} else {
-		a.UserJS = fmt.Sprintf("placed: %d preference(s) from ~/%s", u.Statements, declared)
+		a.UserJS = fmt.Sprintf("placed: %d preference(s) from ~/%s, %d declared account(s); account lists %s",
+			u.Statements, declared, u.Accounts, u.Lists)
 	}
 	// As detach does, with shorter bounds: the worst case of the whole call (3 s for the window tree,
 	// 8 s to quit, 3 + 5 s to start, 4 s to see it) stays under the runtime's 30 s.
@@ -750,12 +853,56 @@ type CheckAnswer struct {
 func (m *Machine) Check() (CheckAnswer, error) {
 	a := CheckAnswer{Findings: []Finding{}}
 	add := func(what, do string) { a.Findings = append(a.Findings, Finding{what, do}) }
-	v, err := m.installed(packageFor)
-	if err != nil {
+	if _, err := m.installed(packageFor); err != nil {
 		return a, err
 	}
-	if v == "" {
-		add("Betterbird ("+packageFor+") is not installed", "install it from the AUR: the node-engine installs packages from the official repositories only, so the module does not")
+	p, perr := m.profile()
+	profilePath := ""
+	if perr == nil {
+		profilePath = p.path
+	}
+	in := m.installation(profilePath)
+	switch {
+	case in.From == "not installed":
+		add("Betterbird is not installed in "+installDir, "the module's push places the mesh's release; it waits for the operator's push (upgrade policy record)")
+	case in.From != "the mesh":
+		add("Betterbird is "+in.From, "quit Betterbird, then push the module to this node: the push removes the community package and places the mesh's release")
+	}
+	if in.Behind {
+		add("Betterbird "+in.Version+" (build "+in.Build+") is behind the newest published build "+in.Newest,
+			"move the module's pin in a reviewed change (novox/hq ADR 0316 §5)")
+	}
+	if in.From == "the mesh" && !strings.HasPrefix(in.Policy, "placed:") {
+		add("the enterprise policy is "+in.Policy, "push the module to this node")
+	}
+	switch {
+	case in.From != "the mesh":
+	case in.Owl == nil || in.Owl.Pinned == "":
+		add("Owl's xpi is not placed ("+owlFile+")", "push the module to this node")
+	case in.Owl.InProfile == "":
+		add("Owl is not installed in the profile yet", "Betterbird installs it from the policy at its next start")
+	case !in.Owl.AtThePin && !newerVersion(in.Owl.InProfile, in.Owl.Pinned):
+		add("Owl "+in.Owl.InProfile+" runs in the profile, older than the mesh's pin "+in.Owl.Pinned,
+			"Owl is installed by policy and cannot be removed in Betterbird: move the module's Owl pin in a reviewed change (novox/hq ADR 0316 §6)")
+	case !in.Owl.Active:
+		add("Owl is installed and not active", "turn it on in Betterbird's add-ons")
+	}
+	if perr == nil {
+		c := m.countAccounts(p.path, p.Dir)
+		for _, r := range c.Each {
+			if r.How == refused {
+				add("refused: "+r.Why, "as it says; the other declared accounts go ahead")
+			}
+		}
+		switch {
+		case c.InList < c.Declared:
+			add(fmt.Sprintf("%d of %d declared account(s) are not in the profile's account list yet", c.Declared-c.InList, c.Declared),
+				"quit Betterbird and start it from the launcher, or betterbird_restart")
+		}
+		if c.WithoutSignIn > 0 {
+			add(fmt.Sprintf("%d declared account(s) have not signed in yet", c.WithoutSignIn),
+				"a person signs in once, in Betterbird's own window, when it asks (novox/hq ADR 0316 §14)")
+		}
 	}
 	ps := m.mainProcs()
 	switch {
@@ -772,6 +919,8 @@ func (m *Machine) Check() (CheckAnswer, error) {
 		add("the module's user.js is not on this machine (~/"+declared+")", "the module is not pushed here: the controller's push")
 	case u.Valid != "":
 		add("the module's user.js is refused: "+u.Valid, "change the module's setting prefs")
+	case u.AccountsProblem != "":
+		add("the module's user.js is not placed: "+u.AccountsProblem, "change the module's setting accounts at the controller's terminal, or propose it (betterbird_accounts)")
 	case !strings.HasPrefix(u.Placed, "the module's, as declared"):
 		add("the profile's user.js is "+u.Placed, "betterbird_user_js with apply, then betterbird_restart")
 	case strings.HasPrefix(u.Effective, "not yet"):

modules/betterbird/cmd/betterbird-tools/betterbird_test.go

@@ -161,7 +161,7 @@ func TestStatusSaysWhatRunsTheProfileTheAddOnsAndTheDisplayPrefs(t *testing.T) {
 		t.Fatal(err)
 	}
 	if len(s.Running) != 1 || s.Running[0].PID != 4000 || s.Children != 1 || s.Installed != "153.1.0esr-1" || !s.Foreign ||
-		s.Version != "153.1.0" || s.Profile == nil || len(s.AddOns) != 1 || s.AddOns[0].ID != "owl@beonex.com" {
+		s.Installation.Version != "153.1.0" || s.Profile == nil || len(s.AddOns) != 1 || s.AddOns[0].ID != "owl@beonex.com" {
 		t.Fatalf("%+v", s)
 	}
 	if !s.Output[0].Dead {
@@ -238,6 +238,13 @@ func TestTheReminderTestTouchesNothingOfTheOperatorsProfile(t *testing.T) {
 		!strings.Contains(string(user), "file:///run/user/1000/"+testUnit+"/test.ics") || strings.Contains(string(user), "someone@") {
 		t.Fatalf("%s", user)
 	}
+	// Betterbird's update check stays off, so no About window opens on the operator's screen, and the
+	// test's own preferences come last, so nothing carried or declared overrides them.
+	if !strings.Contains(string(user), `"betterbird.update.checkIntervalDays", 0`) ||
+		strings.Index(string(user), "extensions.activeThemeID") > strings.Index(string(user), "calendar.registry.meshtest.uri") ||
+		strings.Index(string(user), `"calendar.alarms.show"`) > strings.Index(string(user), "calendar.registry.meshtest.uri") {
+		t.Fatalf("%s", user)
+	}
 	// The event starts 10 minutes after the reminder, which is due 40 s from now.
 	if !strings.Contains(string(cal), "DTSTART:20270115T081040Z") || !strings.Contains(string(cal), "TRIGGER:-PT10M") ||
 		a.Due != "2027-01-15T08:00:40Z" {

modules/betterbird/cmd/betterbird-tools/install.go

@@ -0,0 +1,253 @@
+package main
+
+// What the mesh installs (novox/hq ADR 0316 §1–§9, to-be 56 §1–§3): Betterbird from its pinned upstream release
+// in /opt/betterbird, where the community package betterbird-bin put it, so Betterbird keeps choosing the same
+// profile; the enterprise policy in its distribution directory, which turns Betterbird's own updater off and
+// installs Owl into every profile from the xpi the mesh placed beside it; and a defaults file naming the
+// system's spelling dictionaries. The tools read these files and say what they find: the version against the
+// pin and the newest published build, whether the policy is placed, Owl's version against its pin.
+//
+// **The pin on the machine is what the mesh placed.** The manifest pins the release and the xpi by sha256; the
+// node-engine places exactly those bytes, so the version in /opt/betterbird/application.ini (when the mesh
+// placed it) and the version in the placed xpi are the pins. The community package's own copy is said as
+// such, and the switch from it waits for the operator (ADR 0316 §4).
+
+import (
+	"archive/zip"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+const (
+	installDir = "/opt/betterbird"
+	// policyFile is the enterprise policy the module places (ADR 0316 §7).
+	policyFile = installDir + "/distribution/policies.json"
+	// owlFile is Owl's xpi as the mesh placed it, and the URL the policy installs it from.
+	owlFile = installDir + "/owl/owl.xpi"
+	owlID   = "owl@beonex.com"
+	// preparation is the tools' program as the module places it for its start (betterbird-tools prepare).
+	preparation = "/usr/local/lib/mesh-betterbird/betterbird-tools"
+	// versionsURL is where Betterbird publishes its newest build per major version: what its own updater
+	// reads (MailGlue's BetterbirdUpdateCheck), and what the status compares the installed build with.
+	versionsURL = "https://www.betterbird.eu/start/versions.txt"
+)
+
+// publishedBuilds fetches Betterbird's list of newest builds: a variable so a test answers.
+var publishedBuilds = func() (string, error) {
+	client := &http.Client{Timeout: 5 * time.Second}
+	resp, err := client.Get(versionsURL)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return "", fmt.Errorf("%s answered %s", versionsURL, resp.Status)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 1<<20))
+	return string(body), err
+}
+
+// Installation is what is installed, and from where.
+type Installation struct {
+	// From is the mesh, the community package (betterbird-bin, before the switch), or nothing.
+	From    string `json:"from"`
+	Version string `json:"version,omitempty"`
+	Build   string `json:"build,omitempty"`
+	// Newest is the newest build Betterbird published for this major version, and whether this one is behind.
+	Newest string `json:"newest_published_build,omitempty"`
+	Behind bool   `json:"behind,omitempty"`
+	// Policy says whether the module's enterprise policy is placed, and what it does.
+	Policy string `json:"policy"`
+	// Owl is the add-on's version as the mesh placed it (the pin), and as the profile runs it.
+	Owl *OwlState `json:"owl,omitempty"`
+}
+
+// OwlState is Owl against its pin.
+type OwlState struct {
+	Pinned    string `json:"pinned,omitempty"`
+	InProfile string `json:"in_profile,omitempty"`
+	Active    bool   `json:"active"`
+	AtThePin  bool   `json:"at_the_pin"`
+	// Note says, as a fact, a profile running an Owl newer than the pin: the policy's install keeps a newer
+	// version, and Owl installed by policy cannot be removed in Betterbird.
+	Note string `json:"note,omitempty"`
+}
+
+// newerVersion says whether version a is newer than b, comparing dotted numbers.
+func newerVersion(a, b string) bool {
+	if a == "" || b == "" {
+		return false
+	}
+	pa, pb := strings.Split(a, "."), strings.Split(b, ".")
+	for i := 0; i < len(pa) || i < len(pb); i++ {
+		var x, y int
+		if i < len(pa) {
+			fmt.Sscanf(pa[i], "%d", &x)
+		}
+		if i < len(pb) {
+			fmt.Sscanf(pb[i], "%d", &y)
+		}
+		if x != y {
+			return x > y
+		}
+	}
+	return false
+}
+
+// installation reads what is installed. profile may be empty when none is found yet.
+func (m *Machine) installation(profile string) Installation {
+	var in Installation
+	community, _ := m.installed(packageFor)
+	raw, err := readBounded(m.path(appIni))
+	switch {
+	case community != "":
+		in.From = "the community package " + packageFor + " " + community + ": the switch to the mesh's release waits for the operator's push, with Betterbird quit (novox/hq ADR 0316 §4)"
+	case err == nil:
+		in.From = "the mesh"
+	default:
+		in.From = "not installed"
+	}
+	if err == nil {
+		_, sec := iniSections(raw)
+		in.Version, in.Build = sec["App"]["Version"], sec["App"]["BuildID"]
+		in.Newest, in.Behind = newestBuild(in.Version, in.Build)
+	}
+	in.Policy = m.policyState()
+	pinned := xpiVersion(m.path(owlFile))
+	owl := &OwlState{Pinned: pinned}
+	if profile != "" {
+		for _, a := range addOns(profile) {
+			if a.ID == owlID {
+				owl.InProfile, owl.Active = a.Version, a.Active
+			}
+		}
+	}
+	owl.AtThePin = owl.Pinned != "" && owl.Pinned == owl.InProfile
+	if newerVersion(owl.InProfile, owl.Pinned) {
+		owl.Note = "the profile runs Owl " + owl.InProfile + ", newer than the mesh's pin " + owl.Pinned + ": the policy " +
+			"keeps a newer version and installs the pin only where Owl is missing. To run the same Owl everywhere, " +
+			"move the module's pin in a reviewed change"
+	}
+	if owl.Pinned != "" || owl.InProfile != "" {
+		in.Owl = owl
+	}
+	return in
+}
+
+// newestBuild is the newest build Betterbird published for a version's major, and whether build is older.
+func newestBuild(version, build string) (string, bool) {
+	major, _, _ := strings.Cut(version, ".")
+	if major == "" || build == "" {
+		return "", false
+	}
+	list, err := publishedBuilds()
+	if err != nil {
+		return "unknown: " + err.Error(), false
+	}
+	for _, l := range strings.Split(list, "\n") {
+		f := strings.Split(strings.TrimSpace(l), ",")
+		if len(f) == 3 && f[0] == "Linux" && f[1] == major {
+			return f[2], f[2] > build
+		}
+	}
+	return "unknown: " + versionsURL + " names no build for " + major, false
+}
+
+// policyState says whether the module's policy is placed and does what ADR 0316 §5 and §7 say.
+func (m *Machine) policyState() string {
+	raw, err := readBounded(m.path(policyFile))
+	if err != nil {
+		return "not placed: " + policyFile + " is missing"
+	}
+	if why := policyProblem(raw); why != "" {
+		return "placed, and " + why
+	}
+	return "placed: Betterbird's updater off, Owl installed into every profile from the mesh's xpi, its updates off"
+}
+
+// policyProblem is what the policy fails to say of what ADR 0316 asks, or "".
+func policyProblem(raw []byte) string {
+	var p struct {
+		Policies struct {
+			DisableAppUpdate  bool `json:"DisableAppUpdate"`
+			ExtensionSettings map[string]struct {
+				Mode     string `json:"installation_mode"`
+				URL      string `json:"install_url"`
+				Disabled bool   `json:"updates_disabled"`
+			} `json:"ExtensionSettings"`
+		} `json:"policies"`
+	}
+	if err := json.Unmarshal(raw, &p); err != nil {
+		return "it is not JSON: " + err.Error()
+	}
+	owl, ok := p.Policies.ExtensionSettings[owlID]
+	switch {
+	case !p.Policies.DisableAppUpdate:
+		return "it does not turn Betterbird's updater off (DisableAppUpdate)"
+	case !ok || owl.Mode != "force_installed":
+		return "it does not install Owl into every profile (force_installed)"
+	case owl.URL != "file://"+owlFile:
+		return "it installs Owl from " + owl.URL + ", not from the mesh's xpi"
+	case !owl.Disabled:
+		return "it leaves Owl's updates on"
+	}
+	return ""
+}
+
+// xpiVersion is the version an add-on's manifest.json says, or "" when it cannot be read.
+func xpiVersion(path string) string {
+	r, err := zip.OpenReader(path)
+	if err != nil {
+		return ""
+	}
+	defer r.Close()
+	for _, f := range r.File {
+		if f.Name != "manifest.json" {
+			continue
+		}
+		rc, err := f.Open()
+		if err != nil {
+			return ""
+		}
+		defer rc.Close()
+		var mf struct {
+			Version string `json:"version"`
+		}
+		if json.NewDecoder(io.LimitReader(rc, 1<<20)).Decode(&mf) != nil {
+			return ""
+		}
+		return mf.Version
+	}
+	return ""
+}
+
+// addOns reads a profile's extensions.json: each add-on's id, version, whether it is on, and where from.
+func addOns(profile string) []AddOn {
+	raw, err := readBounded(filepath.Join(profile, "extensions.json"))
+	if err != nil {
+		return nil
+	}
+	var ext struct {
+		Addons []struct {
+			ID       string `json:"id"`
+			Version  string `json:"version"`
+			Active   bool   `json:"active"`
+			Location string `json:"location"`
+		} `json:"addons"`
+	}
+	if json.Unmarshal(raw, &ext) != nil {
+		return nil
+	}
+	var out []AddOn
+	for _, a := range ext.Addons {
+		if a.Location == "app-profile" {
+			out = append(out, AddOn{ID: a.ID, Version: a.Version, Active: a.Active})
+		}
+	}
+	return out
+}

modules/betterbird/cmd/betterbird-tools/install_test.go

@@ -0,0 +1,174 @@
+package main
+
+import (
+	"archive/zip"
+	"encoding/json"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+)
+
+// What the mesh installs, as the tools say it (novox/hq ADR 0316 §16): the version against the pin and the
+// newest published build, the policy, Owl against its pin; and the reminder test, visibly a test.
+
+func (f *fake) xpi(path, version string) {
+	f.t.Helper()
+	full := filepath.Join(f.Root, path)
+	if err := os.MkdirAll(filepath.Dir(full), 0o755); err != nil {
+		f.t.Fatal(err)
+	}
+	out, err := os.Create(full)
+	if err != nil {
+		f.t.Fatal(err)
+	}
+	w := zip.NewWriter(out)
+	m, _ := w.Create("manifest.json")
+	m.Write([]byte(`{"version": "` + version + `", "browser_specific_settings": {"gecko": {"id": "owl@beonex.com"}}}`))
+	w.Close()
+	out.Close()
+}
+
+// placedByTheMesh is a node after the switch: the release, the policy and Owl's xpi in /opt/betterbird, and
+// the profile running Owl at the pin.
+func (f *fake) placedByTheMesh() {
+	f.noPackage()
+	f.write(appIni, "[App]\nVendor=Betterbird Project\nVersion=153.4.0\nBuildID=20260929222610\n")
+	raw, err := os.ReadFile(filepath.Join("..", "..", "install", "distribution", "policies.json"))
+	if err != nil {
+		f.t.Fatal(err)
+	}
+	f.write(policyFile, string(raw))
+	f.xpi(owlFile, "1.5.6.1")
+	f.write(profileDir+"/extensions.json", `{"addons":[{"id":"owl@beonex.com","version":"1.5.6.1","active":true,"location":"app-profile"}]}`)
+}
+
+func TestTheStatusSaysTheInstallationAgainstThePinTheNewestBuildThePolicyAndOwl(t *testing.T) {
+	f := newFake(t)
+	f.betterbird()
+	f.placedByTheMesh()
+	links(t, nil)
+	publishedBuilds = func() (string, error) {
+		return "blocklist,{}\nLinux,153,20261101000000\nLinux,140,20260829111240\n", nil
+	}
+	t.Cleanup(func() { publishedBuilds = func() (string, error) { return "", os.ErrDeadlineExceeded } })
+	s, err := f.Status()
+	if err != nil {
+		t.Fatal(err)
+	}
+	in := s.Installation
+	if in.From != "the mesh" || in.Version != "153.4.0" || in.Newest != "20261101000000" || !in.Behind ||
+		!strings.HasPrefix(in.Policy, "placed:") || in.Owl == nil || in.Owl.Pinned != "1.5.6.1" || !in.Owl.AtThePin || !in.Owl.Active {
+		t.Fatalf("%+v %+v", in, in.Owl)
+	}
+	c, err := f.Check()
+	if err != nil {
+		t.Fatal(err)
+	}
+	found := false
+	for _, x := range c.Findings {
+		found = found || strings.Contains(x.What, "behind the newest published build 20261101000000")
+	}
+	if !found {
+		t.Fatalf("a release left behind is said: %+v", c.Findings)
+	}
+}
+
+func TestTheCommunityPackageAPolicyThatIsNotTheModulesAndAnOwlOffItsPinAreSaid(t *testing.T) {
+	f := newFake(t)
+	f.betterbird()
+	f.placedByTheMesh()
+	links(t, nil)
+	f.write(policyFile, `{"policies": {"ExtensionSettings": {"owl@beonex.com": {"installation_mode": "force_installed",
+	  "install_url": "https://vendor.example/owl.xpi", "updates_disabled": true}}}}`)
+	f.write(profileDir+"/extensions.json", `{"addons":[{"id":"owl@beonex.com","version":"1.5.7","active":true,"location":"app-profile"}]}`)
+	in := f.installation(filepath.Join(f.Root, profileDir))
+	if !strings.Contains(in.Policy, "DisableAppUpdate") || in.Owl.AtThePin || in.Owl.InProfile != "1.5.7" {
+		t.Fatalf("%+v %+v", in, in.Owl)
+	}
+	// A newer Owl than the pin is a fact with the real remedy, never a finding to remove it.
+	if !strings.Contains(in.Owl.Note, "move the module's pin") {
+		t.Fatalf("%+v", in.Owl)
+	}
+	f.write(policyFile, `{"policies": {"DisableAppUpdate": true, "ExtensionSettings": {"owl@beonex.com": {"installation_mode": "force_installed",
+	  "install_url": "file:///opt/betterbird/owl/owl.xpi", "updates_disabled": true}}}}`)
+	c, _ := f.Check()
+	for _, x := range c.Findings {
+		if strings.Contains(x.What, "Owl") {
+			t.Errorf("a newer Owl is not a finding: %+v", x)
+		}
+	}
+	f.write(profileDir+"/extensions.json", `{"addons":[{"id":"owl@beonex.com","version":"1.5.5","active":true,"location":"app-profile"}]}`)
+	c, _ = f.Check()
+	found := false
+	for _, x := range c.Findings {
+		found = found || (strings.Contains(x.What, "older than the mesh's pin") && strings.Contains(x.Do, "move the module's Owl pin"))
+	}
+	if !found {
+		t.Fatalf("an older Owl is a finding whose remedy is the pin: %+v", c.Findings)
+	}
+	f.write(policyFile, `{"policies": {"DisableAppUpdate": true, "ExtensionSettings": {"owl@beonex.com": {"installation_mode": "force_installed",
+	  "install_url": "https://vendor.example/owl.xpi", "updates_disabled": true}}}}`)
+	if in := f.installation(""); !strings.Contains(in.Policy, "not from the mesh's xpi") {
+		t.Fatalf("%s", in.Policy)
+	}
+	f.answer = func(name string, args []string) Output {
+		if name == "pacman" && args[0] == "-Q" {
+			return Output{Stdout: "betterbird-bin 153.1.0esr-1\n"}
+		}
+		return Output{}
+	}
+	in = f.installation("")
+	if !strings.HasPrefix(in.From, "the community package betterbird-bin 153.1.0esr-1") || !strings.Contains(in.From, "operator") {
+		t.Fatalf("%s", in.From)
+	}
+	raw, _ := json.Marshal(in)
+	if strings.Contains(string(raw), "example.org") {
+		t.Fatalf("%s", raw)
+	}
+}
+
+func TestTheReminderTestIsVisiblyATestAndSaysItOpensAWindow(t *testing.T) {
+	f := newFake(t)
+	f.desktopSession()
+	f.betterbird()
+	links(t, nil)
+	f.declare("// none")
+	f.declareAccounts(personal)
+	a, err := f.ReminderTest(40*time.Second, nil, false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dir := filepath.Join("/run/user/1000", testUnit)
+	css := f.read(dir + "/profile/chrome/userChrome.css")
+	user := f.read(dir + "/profile/user.js")
+	cal := f.read(dir + "/test.ics")
+	if !strings.Contains(css, "MESH TEST") || !strings.Contains(css, `:root:not([windowtype="Calendar:AlarmWindow"])`) {
+		t.Fatalf("the test's windows but the reminder carry a MESH TEST band: %s", css)
+	}
+	if !strings.Contains(user, `user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);`) ||
+		strings.Contains(user, "mesh_personal") || strings.Contains(user, "example.org") {
+		t.Fatalf("the test profile reads its userChrome.css and holds no declared account: %s", user)
+	}
+	if !strings.Contains(cal, "SUMMARY:MESH TEST reminder") || !strings.Contains(a.OnScreen, "operator's screen") {
+		t.Fatalf("the event and the answer say it is a test on the operator's screen: %s %+v", cal, a)
+	}
+	if !f.called("systemd-run --user --collect --quiet --unit="+testUnit) || !strings.Contains(strings.Join(f.calls, "\n"), startBin+" --no-remote") {
+		t.Fatalf("the test starts Betterbird itself, never the module's start: %v", f.calls)
+	}
+	for _, tool := range tools() {
+		if tool.Name == "betterbird_reminder_test" && !strings.HasPrefix(tool.Description, "OPENS WINDOWS ON THE OPERATOR'S SCREEN") {
+			t.Fatalf("the description says first that a window opens on the operator's screen: %s", tool.Description)
+		}
+	}
+}
+
+func TestTheUserJSDescriptionSaysAdoption(t *testing.T) {
+	for _, tool := range tools() {
+		if tool.Name == "betterbird_user_js" && (!strings.Contains(tool.Description, "adopted under its own keys") ||
+			strings.Contains(tool.Description, "refuses the apply")) {
+			t.Fatalf("%s", tool.Description)
+		}
+	}
+}

modules/betterbird/cmd/betterbird-tools/main.go

@@ -16,6 +16,15 @@ import (
 )
 
 func main() {
+	// The module's start runs this before Betterbird (novox/hq ADR 0316 §11, §12): the user.js placed and the
+	// declared accounts written into the account lists, while no Betterbird of this account runs.
+	if len(os.Args) == 2 && os.Args[1] == "prepare" {
+		if err := machine.Prepare(); err != nil {
+			fmt.Fprintln(os.Stderr, "betterbird: "+err.Error())
+			os.Exit(1)
+		}
+		return
+	}
 	if err := stdio.Serve("", tools()); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
@@ -29,10 +38,13 @@ func tools() []stdio.Tool {
 		{
 			Name: "betterbird_status",
 			Description: "Betterbird: whether it runs (the main process's pid, since, and the scope it runs in; how " +
-				"many child processes), the installed package and version and whether it is from the AUR, where its " +
-				"output goes, the profile it uses and how that was found, the module's user.js (declared, placed, in " +
-				"effect), the add-ons the operator installed, and the preferences that decide how its windows and " +
-				"notifications look (reminder dialog, theme, renderer, system notifications). (r)",
+				"many child processes); what is installed in /opt/betterbird and from where (the mesh's pinned release, " +
+				"or the community package before the switch), its version and build beside the newest published build; " +
+				"whether the enterprise policy is placed; Owl's version against the mesh's pin and whether it is active; " +
+				"where its output goes; the profile it uses and how that was found; the module's user.js (declared, " +
+				"placed, in effect); the declared accounts by count (in the profile's list, other accounts, not signed " +
+				"in yet), never an address, host or name; the add-ons in the profile; and the preferences that decide " +
+				"how its windows and notifications look. (r)",
 			Run: func(map[string]any) (any, error) { return machine.Status() },
 		},
 		{
@@ -55,11 +67,15 @@ func tools() []stdio.Tool {
 		},
 		{
 			Name: "betterbird_user_js",
-			Description: "The module's user.js — the preferences the module declares, from its setting prefs, written by " +
-				"the mesh to ~/.config/betterbird/user.js — against the profile's user.js: whether it is placed, and " +
-				"whether the running Betterbird started after it was. With apply, place it in the profile (only where " +
-				"the profile has no user.js or the module's own; an operator's file is never overwritten). Betterbird " +
-				"reads it at its next start: betterbird_restart. (r; a with apply)",
+			Description: "The module's user.js — the preferences the module declares (setting prefs), then the declared " +
+				"accounts' preferences under the module's own keys (setting accounts) — against the profile's user.js: " +
+				"whether it is placed, and whether the running Betterbird started after it was. With apply, place it in " +
+				"the profile (only where the profile has no user.js or the module's own; an operator's file is never " +
+				"overwritten). A declared account the profile already holds at its address is adopted under its own keys; " +
+				"one it does not hold is created under the module's keys, which are added to the account lists when " +
+				"Betterbird is not running; an ambiguous one is refused alone, with the remedy (novox/hq ADR 0317). " +
+				"Accounts' values are withheld in the answer. Betterbird reads it at its next start: betterbird_restart. " +
+				"(r; a with apply)",
 			Input: map[string]any{
 				"apply": map[string]any{"type": "boolean", "description": "place the declared user.js in the profile (default false)"},
 			},
@@ -118,19 +134,43 @@ func tools() []stdio.Tool {
 		},
 		{
 			Name: "betterbird_check",
-			Description: "Check what the module promises: Betterbird is installed; one runs; its profile is found; the " +
-				"module's user.js is on the machine, valid, placed in the profile and in effect; its output is read " +
-				"(a pipe nobody reads loses what it prints). Answers ok and each finding with what to do. (r)",
+			Description: "Check what the module promises: Betterbird installed from the mesh's pinned release and not " +
+				"behind the newest published build; the enterprise policy placed; Owl at its pin and active; one " +
+				"Betterbird runs; its profile is found; the module's user.js on the machine, valid, placed and in " +
+				"effect; the declared accounts in the profile's list, none refused, each signed in once; its output " +
+				"read. Answers ok and each finding with what to do, never an address, host or name. (r)",
 			Run: func(map[string]any) (any, error) { return machine.Check() },
 		},
+		{
+			Name: "betterbird_accounts",
+			Description: "The accounts of the profile Betterbird uses, by count and kind: the IMAP and POP3 accounts a " +
+				"declaration can hold, the accounts Owl keeps (never declared), and the rest. Never an address, a host " +
+				"or a name, and never anything of the login store. With propose, it builds the module's setting " +
+				"accounts from them (every account but Owl's, without any password or token) and proposes it through " +
+				"the controller's settings verb for the operator's Approve on a channel that proves who answers " +
+				"(novox/hq ADR 0317, ADR 0277): nothing changes until then, and the operator reads the value whole at " +
+				"their desk. (r; a with propose)",
+			Input: map[string]any{
+				"propose": map[string]any{"type": "boolean", "description": "build the setting accounts from the profile and propose it to the operator (default false)"},
+			},
+			Run: func(args map[string]any) (any, error) {
+				propose, err := flag(args, "propose", false)
+				if err != nil {
+					return nil, err
+				}
+				return machine.ProfileAccounts(propose)
+			},
+		},
 		{
 			Name: "betterbird_reminder_test",
-			Description: "Show a calendar reminder without touching the operator's calendar: a second Betterbird in a " +
-				"throw-away profile under the runtime directory (--no-remote, unit mesh-betterbird-reminder-test, at most " +
-				"10 minutes), with the module's user.js and one local calendar file holding one event whose reminder is " +
-				"due after `after` seconds. carry copies named preferences of the operator's profile (a theme, a " +
-				"colour switch) into it, never a credential or an account. Then xorg_windows (class Calendar) and " +
-				"xorg_screenshot show the reminder window. stop ends it and removes the profile. (a)",
+			Description: "OPENS WINDOWS ON THE OPERATOR'S SCREEN: tell the operator before calling it. Shows a calendar " +
+				"reminder without touching the operator's calendar: a second Betterbird in a throw-away profile under " +
+				"the runtime directory (--no-remote, unit mesh-betterbird-reminder-test, at most 10 minutes), its main " +
+				"window marked MESH TEST in red, with the module's user.js (no accounts) and one local calendar file " +
+				"holding one event, \"MESH TEST reminder\", whose reminder is due after `after` seconds. carry copies " +
+				"named preferences of the operator's profile (a theme, a colour switch) into it, never a credential or " +
+				"an account. Then xorg_windows (class Calendar) and xorg_screenshot show the reminder window. stop ends " +
+				"it and removes the profile. (a)",
 			Input: map[string]any{
 				"after": map[string]any{"type": "integer", "description": "seconds until the reminder is due (default 40, 15 to 300)"},
 				"carry": map[string]any{"type": "array", "items": map[string]any{"type": "string"},

modules/betterbird/cmd/betterbird-tools/manifest_test.go

@@ -2,25 +2,32 @@ package main
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"reflect"
+	"regexp"
+	"strconv"
 	"strings"
 	"testing"
 )
 
-// betterbird's shape (novox/hq issue 345, ADR 0208): no package (Betterbird comes from the AUR, and the
-// node-engine installs from the official repositories only), no seat, no start of its own (the operator
-// starts it from the launcher); the X display on its own machine; one directory and one file of its own,
-// the user.js the setting prefs fills; and the Go bundle serving exactly the listed betterbird_ tools.
+// betterbird's shape (novox/hq issue 345, ADR 0208, ADR 0316): the X display on its own machine; its directory
+// in the home with the user.js the setting prefs fills and the accounts file the setting accounts fills, both
+// trusted; the community package declared absent before anything is placed in /opt/betterbird; Betterbird from
+// its pinned upstream release, Owl pinned by its vendor's digest, the policy and the dictionaries' default
+// unpacked into the installation; the tools' program for the start's preparation, the start and the launcher;
+// every new build waiting for the operator's push; and the Go bundle serving exactly the listed tools.
 
 type manifest struct {
-	Module    string           `json:"module"`
-	Version   string           `json:"version"`
-	Requires  []string         `json:"requires"`
-	Settings  map[string]any   `json:"settings"`
-	Tools     []string         `json:"tools"`
-	Resources []map[string]any `json:"resources"`
+	Module    string            `json:"module"`
+	Version   string            `json:"version"`
+	Upgrade   map[string]string `json:"upgrade"`
+	Requires  []string          `json:"requires"`
+	Invokes   []string          `json:"invokes"`
+	Settings  map[string]any    `json:"settings"`
+	Tools     []string          `json:"tools"`
+	Resources []map[string]any  `json:"resources"`
 	Build     struct {
 		Artifacts []map[string]any `json:"artifacts"`
 	} `json:"build"`
@@ -41,43 +48,216 @@ func readManifest(t *testing.T) (manifest, string) {
 	return m, string(raw)
 }
 
-func TestItOwnsTheUserJSAndNothingOfTheProfile(t *testing.T) {
+func resource(t *testing.T, m manifest, id string) map[string]any {
+	t.Helper()
+	for _, r := range m.Resources {
+		if r["id"] == id {
+			return r
+		}
+	}
+	t.Fatalf("module.json has no resource %s", id)
+	return nil
+}
+
+func artifact(t *testing.T, m manifest, name string) map[string]any {
+	t.Helper()
+	for _, a := range m.Build.Artifacts {
+		if a["name"] == name {
+			return a
+		}
+	}
+	t.Fatalf("module.json builds no artifact %s", name)
+	return nil
+}
+
+func TestItPlacesBetterbirdWhereTheCommunityPackageDidAndOnlyAfterItIsGone(t *testing.T) {
 	m, raw := readManifest(t)
 	if m.Module != "betterbird" || !reflect.DeepEqual(m.Requires, []string{"x11-display"}) {
 		t.Fatalf("%+v", m)
 	}
+	// Every new build waits for a person's push: the switch removes a package and replaces what a running
+	// Betterbird has open (ADR 0316 §4).
+	if m.Upgrade["policy"] != "record" || strings.TrimSpace(m.Upgrade["why"]) == "" {
+		t.Fatalf("the module is marked for a person's approval, with why: %v", m.Upgrade)
+	}
 	var ids []string
 	for _, r := range m.Resources {
 		ids = append(ids, r["id"].(string))
-		if r["type"] == "package" {
-			t.Errorf("betterbird-bin is the AUR's: a package resource asks the node-engine for what it cannot install")
-		}
-		if p, _ := r["path"].(string); !strings.HasPrefix(p, "${machine:account-home}/.config/betterbird") {
-			t.Errorf("a path outside the module's directory: %s", p)
-		}
 	}
-	if strings.Join(ids, ",") != "configuration-dir,user-js" {
-		t.Fatalf("%v", ids)
+	want := "configuration-dir,user-js,accounts,community-package,installation,owl,policies,spelling,preparation,start,launcher"
+	if strings.Join(ids, ",") != want {
+		t.Fatalf("the resources, in the order the node-engine applies them: %v, want %s", ids, want)
+	}
+	pkg := resource(t, m, "community-package")
+	if pkg["type"] != "package" || pkg["package"] != packageFor || pkg["absent"] != true {
+		t.Fatalf("the community package is declared absent (ADR 0180): %v", pkg)
+	}
+	places := map[string]string{"installation": installDir, "owl": filepath.Dir(owlFile),
+		"policies": filepath.Dir(policyFile), "spelling": installDir + "/defaults/pref", "preparation": filepath.Dir(preparation)}
+	arts := map[string]string{"installation": "archive", "owl": "owl", "policies": "distribution", "spelling": "defaults", "preparation": "tools"}
+	for id, path := range places {
+		r := resource(t, m, id)
+		if r["type"] != "archive" || r["path"] != path || r["artifact"] != arts[id] || r["owner"] != nil {
+			t.Errorf("%s is the %s archive unpacked at %s, root's: %v", id, arts[id], path, r)
+		}
 	}
 	for _, never := range []string{".thunderbird", "prefs.js", "logins.json", "key4.db"} {
 		if strings.Contains(raw, never) {
+			t.Errorf("module.json names %q: the profile is Betterbird's", never)
+		}
+	}
+	s := strings.ToLower(raw)
+	for _, never := range []string{"/home/", "jochen", "g14", "shanks", "novox.be", "http://", "mediahuis"} {
+		if strings.Contains(s, never) {
 			t.Errorf("module.json names %q", never)
 		}
 	}
-	file := m.Resources[1]
+}
+
+func TestTheUserJSAndTheAccountsAreTrustedFilesOfTheModulesOwn(t *testing.T) {
+	m, _ := readManifest(t)
+	file := resource(t, m, "user-js")
 	content := file["content"].(string)
-	if !strings.HasPrefix(content, mark) || !strings.Contains(content, "${setting:prefs}") || file["trusted"] != nil {
-		t.Fatalf("the user.js begins with the mark, holds the setting, and stays trusted (only the terminal sets it): %v", file)
+	if !strings.HasPrefix(content, mark) || !strings.Contains(content, "${setting:prefs}") || file["trusted"] != true {
+		t.Fatalf("the user.js begins with the mark, holds the setting, and is trusted (only the terminal or the operator's warrant sets it): %v", file)
 	}
 	// The default is a comment, so a machine without the setting places a valid, empty user.js.
 	def := m.Settings["prefs"].(map[string]any)["default"].(string)
 	if err := validUserJS(strings.ReplaceAll(content, "${setting:prefs}", def)); err != nil {
 		t.Fatal(err)
 	}
+	acc := resource(t, m, "accounts")
+	if acc["path"] != "${machine:account-home}/"+accountsFile || acc["merge"] != "json" || acc["trusted"] != true ||
+		acc["mode"] != "0600" || acc["owner"] != "${machine:account}" {
+		t.Fatalf("the setting accounts reaches the machine as a trusted mergeable file of the account's (ADR 0316 §10, §15): %v", acc)
+	}
+	got, err := parseAccounts([]byte(acc["content"].(string)))
+	if err != nil || len(got) != 0 {
+		t.Fatalf("its default declares no account: %v %v", got, err)
+	}
+	if _, declared := m.Settings["accounts"]; declared {
+		t.Fatal("accounts is the operator's value and has no default in the definition (ADR 0262)")
+	}
+}
+
+func TestBothPinsAreAURLAVersionAndASha256AndOwlIsNeverInTheRepository(t *testing.T) {
+	m, _ := readManifest(t)
+	sha := regexp.MustCompile(`^[0-9a-f]{64}$`)
+	for _, name := range []string{"archive", "owl"} {
+		a := artifact(t, m, name)
+		u, _ := a["url"].(string)
+		if a["kind"] != "archive" || !strings.HasPrefix(u, "https://") || !sha.MatchString(fmt.Sprint(a["sha256"])) ||
+			strings.TrimSpace(fmt.Sprint(a["version"])) == "" || a["from"] != nil {
+			t.Errorf("%s is pinned by URL, version and sha256, and copied from nowhere in the repository: %v", name, a)
+		}
+	}
+	if a := artifact(t, m, "archive"); a["within"] != "betterbird" {
+		t.Errorf("the release unpacks into betterbird/, whose content is the installation: %v", a)
+	}
+	if a := artifact(t, m, "owl"); a["file"] != filepath.Base(owlFile) {
+		t.Errorf("Owl's xpi is kept whole as %s: %v", filepath.Base(owlFile), a)
+	}
+	// Owl's licence forbids copying it to third parties: no xpi anywhere in the module's tree.
+	filepath.Walk(filepath.Join("..", ".."), func(p string, info os.FileInfo, err error) error {
+		if err == nil && strings.HasSuffix(strings.ToLower(p), ".xpi") {
+			t.Errorf("%s is in the repository", p)
+		}
+		return nil
+	})
+}
+
+// owlSupports is the range of Betterbird versions each pinned Owl declares in its manifest.json
+// (browser_specific_settings.gecko strict_min_version, strict_max_version), read from the vendor's xpi
+// when its pin was taken. Moving Owl's pin means reading the new xpi's range into here.
+var owlSupports = map[string][2]string{
+	"1.5.6.1": {"115.0", "156.*"},
+}
+
+// owlAccepts says why a Betterbird version is outside the range an Owl version declares, or nil.
+func owlAccepts(owl, betterbird string) error {
+	r, known := owlSupports[owl]
+	if !known {
+		return fmt.Errorf("Owl %s's supported range is not recorded in owlSupports: read it from the xpi's manifest.json", owl)
+	}
+	major := func(v string) int {
+		head, _, _ := strings.Cut(v, ".")
+		n, err := strconv.Atoi(head)
+		if err != nil {
+			return -1
+		}
+		return n
+	}
+	b, lo, hi := major(betterbird), major(r[0]), major(r[1])
+	if b < 0 || b < lo || b > hi {
+		return fmt.Errorf("Betterbird %s is outside the range Owl %s supports (%s to %s): a Betterbird Owl does not support "+
+			"waits for Owl's pin to move (novox/hq ADR 0316 §8)", betterbird, owl, r[0], r[1])
+	}
+	return nil
+}
+
+func TestABetterbirdOwlDoesNotSupportIsRefused(t *testing.T) {
+	m, _ := readManifest(t)
+	owl, bb := fmt.Sprint(artifact(t, m, "owl")["version"]), fmt.Sprint(artifact(t, m, "archive")["version"])
+	if err := owlAccepts(owl, bb); err != nil {
+		t.Fatal(err)
+	}
+	for _, outside := range []string{"157.0esr-bb1", "102.15.1esr-bb4"} {
+		if err := owlAccepts(owl, outside); err == nil {
+			t.Errorf("Betterbird %s was accepted with Owl %s", outside, owl)
+		}
+	}
+	if err := owlAccepts("9.9", bb); err == nil {
+		t.Error("an Owl whose range nobody read was accepted")
+	}
+}
+
+func TestThePolicyTurnsTheUpdaterOffAndInstallsTheMeshsOwlEverywhere(t *testing.T) {
+	m, _ := readManifest(t)
+	if a := artifact(t, m, "distribution"); a["kind"] != "archive" || a["from"] != "install/distribution" {
+		t.Fatalf("%v", a)
+	}
+	raw, err := os.ReadFile(filepath.Join("..", "..", "install", "distribution", "policies.json"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if why := policyProblem(raw); why != "" {
+		t.Fatalf("the module's policies.json: %s", why)
+	}
+	entries, _ := os.ReadDir(filepath.Join("..", "..", "install", "distribution"))
+	if len(entries) != 1 {
+		t.Fatalf("the distribution directory holds the policy alone: %v", entries)
+	}
+	if a := artifact(t, m, "defaults"); a["kind"] != "archive" || a["from"] != "install/defaults-pref" {
+		t.Fatalf("%v", a)
+	}
+	prefs, err := os.ReadFile(filepath.Join("..", "..", "install", "defaults-pref", "vendor-prefs.js"))
+	if err != nil || !strings.Contains(string(prefs), `pref("spellchecker.dictionary_path", "/usr/share/hunspell");`) {
+		t.Fatalf("the dictionaries are named as a default, in place of a link: %s %v", prefs, err)
+	}
+}
+
+func TestTheStartPreparesThenStartsBetterbirdAndTheLauncherUsesIt(t *testing.T) {
+	m, _ := readManifest(t)
+	start := resource(t, m, "start")
+	content := start["content"].(string)
+	if start["path"] != "/usr/local/bin/betterbird" || start["mode"] != "0755" ||
+		!strings.Contains(content, "\n"+preparation+" prepare ||") || !strings.HasSuffix(content, "\nexec "+startBin+" \"$@\"\n") {
+		t.Fatalf("the start runs the preparation, says when it did not complete, and starts Betterbird either way: %v", start)
+	}
+	launcher := resource(t, m, "launcher")
+	lc := launcher["content"].(string)
+	if launcher["path"] != "/usr/local/share/applications/eu.betterbird.Betterbird.desktop" ||
+		!strings.Contains(lc, "\nExec=/usr/local/bin/betterbird %u\n") || !strings.Contains(lc, "\nIcon="+installDir+"/") ||
+		!strings.Contains(lc, "\nStartupWMClass=eu.betterbird.Betterbird\n") {
+		t.Fatalf("the launcher starts the module's start and names the icon in the installation: %v", launcher)
+	}
+	if b := artifact(t, m, "tools"); filepath.Base(preparation) != b["binary"] {
+		t.Fatalf("the preparation runs the tools' binary: %v", b)
+	}
 }
 
 func TestTheToolsAgreeWithTheManifest(t *testing.T) {
-	m, raw := readManifest(t)
+	m, _ := readManifest(t)
 	served := map[string]bool{}
 	for _, tool := range tools() {
 		served[tool.Name] = true
@@ -94,17 +274,12 @@ func TestTheToolsAgreeWithTheManifest(t *testing.T) {
 	for name := range served {
 		t.Errorf("the bundle serves %s, which module.json does not list", name)
 	}
-	if len(m.Build.Artifacts) != 1 {
-		t.Fatalf("%v", m.Build.Artifacts)
-	}
-	b := m.Build.Artifacts[0]
+	b := artifact(t, m, "tools")
 	if b["kind"] != "bundle" || b["language"] != "go" || b["from"] != "cmd/betterbird-tools" || b["binary"] != "betterbird-tools" {
 		t.Errorf("the Go tools bundle: %v", b)
 	}
-	s := strings.ToLower(raw)
-	for _, never := range []string{"/home/", "jochen", "g14", "shanks", "novox.be", "http"} {
-		if strings.Contains(s, never) {
-			t.Errorf("module.json names %q", never)
-		}
+	// betterbird_accounts proposes the setting accounts through the controller's settings verb (ADR 0317 §9).
+	if !reflect.DeepEqual(m.Invokes, []string{"seat:mesh-controller.settings"}) {
+		t.Errorf("the module invokes the controller's settings verb and nothing else: %v", m.Invokes)
 	}
 }

modules/betterbird/cmd/betterbird-tools/reminder.go

@@ -10,6 +10,13 @@ package main
 // module declares. A theme or another preference of the operator's profile can be carried over by
 // name (carry), within the same limits as betterbird_prefs: never a credential, never an account.
 //
+// **It is visibly a test** (the operator, 2026-10-12): on 2026-10-12 at 12:05 a test Betterbird with an empty
+// profile carrying the operator's theme looked like the operator's configuration lost. So the test profile
+// carries a userChrome.css that marks its main window with a red band reading MESH TEST, and the event is
+// called "MESH TEST reminder". The reminder window itself is left as Betterbird draws it, because how it is
+// drawn is what the test looks at. The tool's description says a window opens on the operator's screen, so
+// a caller tells the operator first.
+//
 // It lives for at most ten minutes (the unit's RuntimeMaxSec), and stop ends it early and removes the
 // profile. The reminder window is then found with xorg_windows (class Calendar, role AlarmWindow) and
 // looked at with xorg_screenshot.
@@ -41,6 +48,7 @@ type ReminderAnswer struct {
 	Carried  []string `json:"carried,omitempty"`
 	Withheld []string `json:"withheld,omitempty"`
 	Look     string   `json:"look"`
+	OnScreen string   `json:"on_screen,omitempty"`
 	Stopped  bool     `json:"stopped,omitempty"`
 }
 
@@ -50,11 +58,38 @@ func ics(now time.Time, after time.Duration, stamp string) string {
 	start := now.Add(after + 10*time.Minute)
 	return strings.Join([]string{"BEGIN:VCALENDAR", "VERSION:2.0", "PRODID:-//novox mesh//betterbird reminder test//EN",
 		"BEGIN:VEVENT", "UID:mesh-reminder-test-" + stamp + "@mesh", "DTSTAMP:" + f(now), "DTSTART:" + f(start),
-		"DTEND:" + f(start.Add(30*time.Minute)), "SUMMARY:Mesh reminder test", "BEGIN:VALARM", "ACTION:DISPLAY",
-		"DESCRIPTION:Mesh reminder test", "TRIGGER:-PT10M", "END:VALARM", "END:VEVENT", "END:VCALENDAR", ""}, "\r\n")
+		"DTEND:" + f(start.Add(30*time.Minute)), "SUMMARY:" + testTitle, "BEGIN:VALARM", "ACTION:DISPLAY",
+		"DESCRIPTION:" + testTitle, "TRIGGER:-PT10M", "END:VALARM", "END:VEVENT", "END:VCALENDAR", ""}, "\r\n")
 }
 
+// testTitle is the test event's title: what the reminder window shows.
+const testTitle = "MESH TEST reminder (a throw-away Betterbird of the mesh, not your calendar)"
+
+// testChrome is the test profile's userChrome.css: a red band reading MESH TEST across the top of every
+// Betterbird window but the reminder (windowtype Calendar:AlarmWindow), and a red frame around it, so the test
+// Betterbird is never taken for the operator's.
+const testChrome = `/* The mesh's reminder test (module betterbird, novox/hq issue 345): a throw-away Betterbird, not yours. */
+:root:not([windowtype="Calendar:AlarmWindow"]) {
+  outline: 6px solid #d00000 !important;
+  outline-offset: -6px !important;
+}
+:root:not([windowtype="Calendar:AlarmWindow"]) > body::before {
+  content: "MESH TEST \2014  a throw-away Betterbird started by the mesh for a reminder test; your mail and calendar are not here. It ends by itself within 10 minutes.";
+  display: block !important;
+  background: #d00000 !important;
+  color: #ffffff !important;
+  font: bold 15px sans-serif !important;
+  padding: 6px 12px !important;
+  text-align: center !important;
+}
+`
+
 // testPrefs are the test profile's own preferences: its one calendar, and no first-run questions.
+//
+// betterbird.update.checkIntervalDays 0 is Betterbird's own switch for its update check (MailGlue): a
+// fresh profile has never checked, so Betterbird checks at its start and, when betterbird.eu publishes a
+// newer build than the installed one, opens the About window on the operator's screen and gives it the
+// focus (seen on the workstation 2026-10-12, novox/hq issue 345). The test is about the reminder only.
 func testPrefs(calendar string) string {
 	return strings.Join([]string{
 		`user_pref("calendar.registry.meshtest.type", "ics");`,
@@ -68,7 +103,9 @@ func testPrefs(calendar string) string {
 		`user_pref("datareporting.policy.dataSubmissionEnabled", false);`,
 		`user_pref("toolkit.telemetry.reportingpolicy.firstRun", false);`,
 		`user_pref("app.update.auto", false);`,
+		`user_pref("betterbird.update.checkIntervalDays", 0);`,
 		`user_pref("mail.rights.version", 1);`,
+		`user_pref("toolkit.legacyUserProfileCustomizations.stylesheets", true);`,
 		"",
 	}, "\n")
 }
@@ -125,14 +162,22 @@ func (m *Machine) ReminderTest(after time.Duration, carry []string, stop bool) (
 	if err := os.WriteFile(calendar, []byte(ics(now, after, strconv.FormatInt(now.Unix(), 10))), 0o600); err != nil {
 		return a, err
 	}
-	user := testPrefs(strings.TrimPrefix(calendar, m.Root))
+	// The module's user.js first, then what is carried, then the test's own preferences: the last
+	// statement wins, so neither can take the test's calendar or its quiet start away.
+	user := ""
 	if mine, err := readBounded(m.home(declared)); err == nil && validUserJS(string(mine)) == nil {
-		user = string(mine) + "\n" + user
+		user = string(mine) + "\n"
 	}
-	user += strings.Join(carried, "\n") + "\n"
+	user += strings.Join(carried, "\n") + "\n" + testPrefs(strings.TrimPrefix(calendar, m.Root))
 	if err := os.WriteFile(filepath.Join(dir, "profile", "user.js"), []byte(user), 0o600); err != nil {
 		return a, err
 	}
+	if err := os.MkdirAll(filepath.Join(dir, "profile", "chrome"), 0o700); err != nil {
+		return a, err
+	}
+	if err := os.WriteFile(filepath.Join(dir, "profile", "chrome", "userChrome.css"), []byte(testChrome), 0o600); err != nil {
+		return a, err
+	}
 	// The unit removes the profile when it ends, however it ends: at its 10 minutes, on stop, or when the
 	// test Betterbird is closed.
 	call := []string{"--user", "--collect", "--quiet", "--unit=" + testUnit, "-p", "RuntimeMaxSec=600",
@@ -146,7 +191,9 @@ func (m *Machine) ReminderTest(after time.Duration, carry []string, stop bool) (
 	if err := failed(m.cmd(8*time.Second, s.Env(), "systemd-run", call...), "systemd-run", call...); err != nil {
 		return a, err
 	}
-	a.Event = "Mesh reminder test, in a calendar file of the test profile only"
+	a.Event = testTitle + ", in a calendar file of the test profile only"
+	a.OnScreen = "a second Betterbird's window is now on the operator's screen, marked MESH TEST in red; its reminder " +
+		"window follows when the reminder is due. Both go when the test ends (stop, or 10 minutes)"
 	a.Due = now.Add(after).UTC().Format(time.RFC3339)
 	return a, nil
 }

modules/betterbird/cmd/betterbird-tools/setup_test.go

@@ -0,0 +1,16 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+	"os"
+	"testing"
+)
+
+// No test reaches the network or the mesh: Betterbird's list of published builds and the controller's
+// settings verb answer from here, and a test that needs them says what they answer.
+func TestMain(m *testing.M) {
+	publishedBuilds = func() (string, error) { return "", errors.New("no network in tests") }
+	asker = func(string, any) (json.RawMessage, error) { return nil, errors.New("no mesh in tests") }
+	os.Exit(m.Run())
+}

modules/betterbird/install/defaults-pref/vendor-prefs.js

@@ -0,0 +1,3 @@
+// Written by the mesh (module betterbird, novox/hq ADR 0316 §3): the system's spelling dictionaries, named
+// as a default preference in place of the link the community package made.
+pref("spellchecker.dictionary_path", "/usr/share/hunspell");

modules/betterbird/install/distribution/policies.json

@@ -0,0 +1,12 @@
+{
+  "policies": {
+    "DisableAppUpdate": true,
+    "ExtensionSettings": {
+      "owl@beonex.com": {
+        "installation_mode": "force_installed",
+        "install_url": "file:///opt/betterbird/owl/owl.xpi",
+        "updates_disabled": true
+      }
+    }
+  }
+}

modules/betterbird/module.json

@@ -1,14 +1,21 @@
 {
   "module": "betterbird",
   "version": "1",
+  "upgrade": {
+    "policy": "record",
+    "why": "a new build may remove the community package betterbird-bin and replaces the installation in /opt/betterbird, which a running Betterbird has open: the switch on each node and every upgrade wait for the operator, who quits Betterbird first and then pushes (novox/hq ADR 0316 §4, §5)"
+  },
   "requires": [
     "x11-display"
   ],
+  "invokes": [
+    "seat:mesh-controller.settings"
+  ],
   "settings": {
     "prefs": {
       "kind": "preference",
       "default": "// none",
-      "why": "Betterbird runs with its own defaults until a machine's assignment names a preference: one line of user_pref(\"name\", value); statements, which the module's user.js holds and Betterbird reads at its start (novox/hq issue 345)"
+      "why": "Betterbird runs with its own defaults until a machine's assignment names a preference: one line of user_pref(\"name\", value); statements, which the module's user.js holds and Betterbird reads at its start (novox/hq issue 345). An account's preferences (mail.account., mail.identity., mail.server., mail.smtpserver. and the account lists) are refused here: an account is declared in the setting accounts, so it has one owner (novox/hq ADR 0316 §11)"
     }
   },
   "tools": [
@@ -18,6 +25,7 @@
     "betterbird_log",
     "betterbird_restart",
     "betterbird_check",
+    "betterbird_accounts",
     "betterbird_reminder_test"
   ],
   "resources": [
@@ -34,7 +42,68 @@
       "path": "${machine:account-home}/.config/betterbird/user.js",
       "owner": "${machine:account}",
       "mode": "0644",
-      "content": "// Betterbird's user.js (module betterbird, novox/hq issue 345). Owned by the mesh: the node-engine\n// writes it here at every push, and the module's tools copy it whole into Betterbird's profile\n// (betterbird_user_js with apply, betterbird_restart), where Betterbird reads it at its start and lets it\n// win over the preferences Betterbird saves itself. Change the module's setting prefs, never this file or the profile's copy.\n//\n// Only comments and user_pref(\"name\", value); statements; the tools refuse anything else, and any\n// preference whose name can hold a credential.\n${setting:prefs}\n"
+      "content": "// Betterbird's user.js (module betterbird, novox/hq issue 345). Owned by the mesh: the node-engine\n// writes it here at every push, and the module's tools copy it whole into Betterbird's profile\n// (betterbird_user_js with apply, betterbird_restart), where Betterbird reads it at its start and lets it\n// win over the preferences Betterbird saves itself. Change the module's setting prefs, never this file or the profile's copy.\n//\n// Only comments and user_pref(\"name\", value); statements; the tools refuse anything else, and any\n// preference whose name can hold a credential.\n${setting:prefs}\n",
+      "trusted": true
+    },
+    {
+      "id": "accounts",
+      "type": "file",
+      "path": "${machine:account-home}/.config/betterbird/accounts.json",
+      "owner": "${machine:account}",
+      "mode": "0600",
+      "merge": "json",
+      "content": "{\n  \"accounts\": {}\n}\n",
+      "trusted": true
+    },
+    {
+      "id": "community-package",
+      "type": "package",
+      "package": "betterbird-bin",
+      "absent": true
+    },
+    {
+      "id": "installation",
+      "type": "archive",
+      "path": "/opt/betterbird",
+      "artifact": "archive"
+    },
+    {
+      "id": "owl",
+      "type": "archive",
+      "path": "/opt/betterbird/owl",
+      "artifact": "owl"
+    },
+    {
+      "id": "policies",
+      "type": "archive",
+      "path": "/opt/betterbird/distribution",
+      "artifact": "distribution"
+    },
+    {
+      "id": "spelling",
+      "type": "archive",
+      "path": "/opt/betterbird/defaults/pref",
+      "artifact": "defaults"
+    },
+    {
+      "id": "preparation",
+      "type": "archive",
+      "path": "/usr/local/lib/mesh-betterbird",
+      "artifact": "tools"
+    },
+    {
+      "id": "start",
+      "type": "file",
+      "path": "/usr/local/bin/betterbird",
+      "mode": "0755",
+      "content": "#!/bin/sh\n# Betterbird's start, written by the mesh (module betterbird, novox/hq ADR 0316). Replaced at every push.\n#\n# Before Betterbird starts, the module's tools place its user.js in the profile (the setting prefs, and the\n# accounts the setting accounts declares) and add the declared accounts to the profile's account list. They do\n# it only while no Betterbird of this account runs, because Betterbird rewrites its saved preferences when it quits; a\n# second start while one runs only hands over to it. What the preparation could not do it says here, and\n# betterbird_check says it too. Betterbird starts either way: its configuration never holds the mail back.\n/usr/local/lib/mesh-betterbird/betterbird-tools prepare || echo \"betterbird: the mesh's preparation did not complete; betterbird_check says why\" >&2\nexec /opt/betterbird/betterbird \"$@\"\n"
+    },
+    {
+      "id": "launcher",
+      "type": "file",
+      "path": "/usr/local/share/applications/eu.betterbird.Betterbird.desktop",
+      "mode": "0644",
+      "content": "[Desktop Entry]\nVersion=1.0\nType=Application\nName=Betterbird\nGenericName=Mail Client\nComment=Send and receive mail with Betterbird\nExec=/usr/local/bin/betterbird %u\nIcon=/opt/betterbird/chrome/icons/default/default128.png\nTerminal=false\nCategories=Network;Email;\nMimeType=message/rfc822;x-scheme-handler/mailto;application/x-xpinstall;application/x-extension-ics;text/calendar;text/vcard;text/x-vcard;x-scheme-handler/webcal;x-scheme-handler/webcals;x-scheme-handler/mid;\nStartupNotify=true\nStartupWMClass=eu.betterbird.Betterbird\nKeywords=Email;E-mail;Calendar;Thunderbird;\nActions=ComposeMessage;OpenAddressBook;\n# Written by the mesh (module betterbird, novox/hq ADR 0316 §3), in place of the community package's entry:\n# it starts Betterbird through the module's start, and names the icon in the installation, with no link.\n\n[Desktop Action ComposeMessage]\nName=Write new message\nExec=/usr/local/bin/betterbird -compose\n\n[Desktop Action OpenAddressBook]\nName=Open address book\nExec=/usr/local/bin/betterbird -addressbook\n"
     }
   ],
   "build": {
@@ -49,6 +118,38 @@
         "loads": [
           "betterbird-tools"
         ]
+      },
+      {
+        "name": "archive",
+        "kind": "archive",
+        "url": "https://www.betterbird.eu/downloads/LinuxArchive/betterbird-153.4.0esr-bb10.en-US.linux-x86_64.tar.xz",
+        "sha256": "38dd24890a66b4cf9a45bc24e15192e00c26b929e1bb8df7974c16a4539129e2",
+        "version": "153.4.0esr-bb10",
+        "within": "betterbird",
+        "names-on-purpose": {
+          "www.betterbird.eu": "Betterbird's project publishes its Linux release there; the build seat fetches it once, by its pinned sha256 (novox/hq ADR 0316 §2)"
+        }
+      },
+      {
+        "name": "owl",
+        "kind": "archive",
+        "url": "https://www.beonex.com/owl/owl.xpi",
+        "sha256": "a54cc3d52113b34f97942ee19190947dee23561e2217f18db3d80ac023991221",
+        "version": "1.5.6.1",
+        "file": "owl.xpi",
+        "names-on-purpose": {
+          "www.beonex.com": "Owl's vendor publishes its xpi there; the build seat fetches it once, by its pinned sha256 (novox/hq ADR 0316 §6)"
+        }
+      },
+      {
+        "name": "distribution",
+        "kind": "archive",
+        "from": "install/distribution"
+      },
+      {
+        "name": "defaults",
+        "kind": "archive",
+        "from": "install/defaults-pref"
       }
     ]
   }

modules/mesh-delivery/cmd/mesh-delivery/effects.go

@@ -104,6 +104,9 @@ func statusOf(d *Delivery) (string, string) {
 	case Superseded:
 		return "warning", clip("superseded: "+why, 140)
 	case Stopped:
+		if d.coveredStop() {
+			return "success", clip(d.coveredStopSaid(), 140) // its change reached the machines (novox/hq issue 480)
+		}
 		return "error", clip("stopped: "+why, 140)
 	case Retired:
 		return "success", "history: merged before this owner delivered anything, never walked"
@@ -124,6 +127,9 @@ const viewMarker = "<!-- mesh-delivery:view -->"
 func ViewBody(d *Delivery, g *Group) string {
 	var b strings.Builder
 	fmt.Fprintf(&b, "%s\n**Delivery** `%s` — **%s** since %s\n\n", viewMarker, d.ID, d.State, d.Since.UTC().Format(time.RFC3339))
+	if d.coveredStop() {
+		fmt.Fprintf(&b, "**Covered** after its stop: a later merge that contains it was delivered: %s\n\n", d.CoveredBy)
+	}
 	if d.HeldWhy != "" && d.State == Held {
 		fmt.Fprintf(&b, "Held for a person: %s — `mesh-delivery.release` with why lets it go on.\n\n", d.HeldWhy)
 	}
@@ -278,6 +284,16 @@ func (h *Holder) Flush() {
 			d.Owed = owed(d.Owed)
 			h.keep(d)
 		}
+		// Counted for delivery_status, so a window's writes can be judged against its tries (novox/hq issue 407).
+		h.tried.last = h.Now()
+		switch {
+		case err == nil:
+			h.tried.done++
+		case dropped != "":
+			h.tried.givenUp++
+		default:
+			h.tried.failed++
+		}
 		if dropped != "" {
 			h.refuse(fmt.Errorf("%s: its owed %s given up — %s: %v", j.id, j.e.Kind, dropped, err))
 		}

modules/mesh-delivery/cmd/mesh-delivery/holder.go

@@ -67,6 +67,16 @@ type Holder struct {
 	// leaveRefused is, by walk, what the controller answered when it refused both to leave a stopped merge out and
 	// to stop the walk whole.
 	leaveRefused map[string]string
+	// tried counts the owed effects Flush tried since this owner started, by how each ended (novox/hq issue 407).
+	tried owedTries
+}
+
+// owedTries is how many owed effects were tried since this owner started, and when the last was: three numbers
+// and a time, however many were tried. Not kept: a restarted owner counts from its start, and says since when, so a
+// window's count is the difference of two readings in the same run (novox/hq issue 407).
+type owedTries struct {
+	done, failed, givenUp int
+	last                  time.Time
 }
 
 // unmatched is a walk no delivery is known for yet: its merge not heard, or merged before this owner held.
@@ -953,12 +963,16 @@ func (h *Holder) plan() []func() {
 	// grace, it is stopped saying so — never left waiting for a start that cannot come.
 	for _, d := range h.deliveries {
 		ended := d.endedUnstarted()
+		if d.coveredStop() && !d.CoverTold {
+			h.tellCovered(d, now) // covered before this holder told it, or before a restart (novox/hq issue 480)
+			continue
+		}
 		if strandedUncovered(d) {
 			// Stopped and final, but still read for a later merge that delivered its modules: until one did,
 			// `stalled` keeps listing it (review of novox/hq issue 474).
 			var ask []string
 			if d.CoveredBy, ask = h.coverOf(d); d.CoveredBy != "" {
-				h.keep(d)
+				h.tellCovered(d, now)
 			}
 			for _, in := range ask {
 				if a := h.askContains(d, in, now); a != nil {
@@ -1103,6 +1117,25 @@ func (h *Holder) laterOnItsWay(d *Delivery) string {
 	return ""
 }
 
+// tellCovered tells the forge that a stop is covered since, once: its status says covered and by which merge, its view
+// says so, and its note keeps the line on its head and its merge commit (novox/hq issue 480). No transition: the stop
+// stays final, and the bus's transition event is not said again.
+func (h *Holder) tellCovered(d *Delivery, now time.Time) {
+	d.CoverTold = true
+	line := oneLine(fmt.Sprintf("%s delivery %s: stopped, %s", now.UTC().Format(time.RFC3339), d.ID, d.coveredStopSaid()))
+	d.Owed = append(d.Owed, Effect{Kind: EffectNote, Commit: d.Commit, Line: line, Since: now})
+	if d.MergedAs != "" && !sameCommit(d.MergedAs, d.Commit) {
+		d.Owed = append(d.Owed, Effect{Kind: EffectNote, Commit: d.MergedAs, Line: line, Since: now})
+	}
+	if d.shownOnItsPullRequest() {
+		d.owe(Effect{Kind: EffectView, Since: now})
+		state, desc := statusOf(d)
+		d.owe(Effect{Kind: EffectStatus, Commit: d.Commit, Context: "mesh/delivery", State: state, Line: desc, Since: now})
+	}
+	h.Logf("[mesh-delivery] %s: stopped, %s", d.ID, d.coveredStopSaid())
+	h.keep(d)
+}
+
 // strandedUncovered is whether a delivery stopped because its ended walk delivered nothing is still uncovered: a
 // merged change that never reached the machines, which `stalled` keeps listing until a later delivered merge
 // carries its modules (review of novox/hq issue 474).

modules/mesh-delivery/cmd/mesh-delivery/issue407_test.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"testing"
+	"time"
+)
+
+// triedSaid is delivery_status's count of owed effects tried (novox/hq issue 407), read as a test reads it.
+func triedSaid(t *testing.T, w *world) map[string]any {
+	t.Helper()
+	got, ok := w.h.Status("listening")["owed-tried"].(map[string]any)
+	if !ok {
+		t.Fatalf("delivery_status says no owed-tried: %v", w.h.Status("listening"))
+	}
+	return got
+}
+
+func countOf(t *testing.T, m map[string]any, key string) int {
+	t.Helper()
+	n, ok := m[key].(int)
+	if !ok {
+		t.Fatalf("owed-tried has no count %q: %v", key, m)
+	}
+	return n
+}
+
+// novox/hq issue 407: delivery_status says how many owed effects were tried since this owner started, how
+// many were done, failed to be tried again, or were given up, and when the last was tried — so a window's
+// writes can be checked against the tries made in it (issue 326's rule) by reading it at both ends.
+func TestDeliveryStatusCountsTheOwedEffectsTried(t *testing.T) {
+	w := newWorld(t)
+	start := w.now
+	tried := triedSaid(t, w)
+	if countOf(t, tried, "tried") != 0 || countOf(t, tried, "done") != 0 || countOf(t, tried, "failed") != 0 ||
+		countOf(t, tried, "given-up") != 0 {
+		t.Fatalf("a holder that tried nothing says %v", tried)
+	}
+	if tried["since"] != start.Format(time.RFC3339) {
+		t.Fatalf("its count is since %v, the holder started %s", tried["since"], start.Format(time.RFC3339))
+	}
+	if _, there := tried["last"]; there {
+		t.Fatalf("nothing tried, yet a last try is said: %v", tried)
+	}
+
+	// A head seen: its event and its note are owed and done.
+	w.h.PullUpdated(pr("novox/app", 7, head, "feat/x", "src/a.go"))
+	w.settleAll()
+	tried = triedSaid(t, w)
+	done := countOf(t, tried, "done")
+	if done < len(w.said)+len(w.forge.notesOn(head)) || done == 0 {
+		t.Fatalf("said %d and noted %d, yet done counts %d", len(w.said), len(w.forge.notesOn(head)), done)
+	}
+	if countOf(t, tried, "tried") != done || countOf(t, tried, "failed") != 0 {
+		t.Fatalf("every try succeeded, yet %v", tried)
+	}
+	if tried["last"] != w.now.Format(time.RFC3339) {
+		t.Fatalf("last try said %v, tried at %s", tried["last"], w.now.Format(time.RFC3339))
+	}
+
+	// The forge away: its effects fail and are counted failed; quiet passes try nothing more.
+	w.forge.down = true
+	w.later(time.Minute)
+	w.h.Checked(verdict("novox/app", 7, head, "pass"))
+	w.h.Flush()
+	tried = triedSaid(t, w)
+	failed := countOf(t, tried, "failed")
+	if failed == 0 {
+		t.Fatalf("the forge away failed nothing: %v", tried)
+	}
+	if countOf(t, tried, "tried") != countOf(t, tried, "done")+failed+countOf(t, tried, "given-up") {
+		t.Fatalf("tries do not add up: %v", tried)
+	}
+	if tried["last"] != w.now.Format(time.RFC3339) {
+		t.Fatalf("last try said %v, tried at %s", tried["last"], w.now.Format(time.RFC3339))
+	}
+	before := countOf(t, tried, "tried")
+	w.h.Flush() // before each failure's next try: nothing is tried
+	if n := countOf(t, triedSaid(t, w), "tried"); n != before {
+		t.Fatalf("a pass before any next try tried %d", n-before)
+	}
+
+	// The forge back, past every next try: the failed effects are done.
+	w.forge.down = false
+	w.later(time.Hour)
+	w.h.Flush()
+	tried = triedSaid(t, w)
+	if countOf(t, tried, "tried") != before+failed || countOf(t, tried, "done") <= done {
+		t.Fatalf("the forge back: tried %d (was %d, %d failed), %v", countOf(t, tried, "tried"), before, failed, tried)
+	}
+}
+
+// The count is this run's: a restarted holder says it counts since its own start, from nothing.
+func TestOwedTriedCountsSinceTheStart(t *testing.T) {
+	w := newWorld(t)
+	w.h.PullUpdated(pr("novox/app", 7, head, "feat/x", "src/a.go"))
+	w.settleAll()
+	if countOf(t, triedSaid(t, w), "tried") == 0 {
+		t.Fatal("nothing counted before the restart")
+	}
+	again := newWorldOver(t, w.store, w.ctl, w.forge, w.now.Add(time.Minute))
+	tried := triedSaid(t, again)
+	if countOf(t, tried, "tried") != 0 || tried["since"] != again.now.Format(time.RFC3339) {
+		t.Fatalf("a restarted holder says %v", tried)
+	}
+}

modules/mesh-delivery/cmd/mesh-delivery/issue451_test.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"encoding/json"
+	"strings"
+	"testing"
+	"time"
+)
+
+// **An unanswered line says the state of the delivery it holds, as data** (novox/hq issue 451): for a delivery in
+// ready or rejected, whose check answered once, the controller advises a recheck rather than the build queue, and
+// it reads that state from the line, never from its words. A head with no delivery held says none.
+func TestAnUnansweredLineNamesTheStateOfItsDelivery(t *testing.T) {
+	at := time.Date(2026, 10, 11, 0, 43, 0, 0, time.UTC)
+	for _, c := range []struct {
+		gate string
+		want State
+	}{{"pass", Ready}, {"fail", Rejected}} {
+		w := newWorldOver(t, newMemStore(), newFakeController(), newFakeForge(), at)
+		id := heldIn(t, w, c.gate, c.want)
+		w.forge.open = openPullsOf(t, readyRepoCheckPending)
+		w.h.SeeOpenPulls()
+		w.later(Bounds[Proposed].For + time.Minute)
+		w.h.SeeOpenPulls()
+		lines := w.h.Stalled()
+		if len(lines) != 1 || lines[0].ID != id || lines[0].State != Unanswered || lines[0].Held != c.want {
+			t.Fatalf("a %s delivery's unanswered line does not say its state as data: %+v", c.want, lines)
+		}
+		raw, _ := json.Marshal(lines[0])
+		if !strings.Contains(string(raw), `"held":"`+string(c.want)+`"`) {
+			t.Fatalf("the line the controller reads carries no held state: %s", raw)
+		}
+	}
+
+	// The same head with no delivery held here: unanswered, and no state to say.
+	w := newWorldOver(t, newMemStore(), newFakeController(), newFakeForge(), at)
+	w.forge.open = openPullsOf(t, readyRepoCheckPending)
+	w.h.SeeOpenPulls()
+	w.later(Bounds[Proposed].For + time.Minute)
+	w.h.SeeOpenPulls()
+	lines := w.h.Stalled()
+	if len(lines) != 1 || lines[0].State != Unanswered || lines[0].Held != "" {
+		t.Fatalf("a head with no delivery held says a state: %+v", lines)
+	}
+	if raw, _ := json.Marshal(lines[0]); strings.Contains(string(raw), `"held"`) {
+		t.Fatalf("a line with no delivery held carries a held field: %s", raw)
+	}
+}

modules/mesh-delivery/cmd/mesh-delivery/issue480_test.go

@@ -0,0 +1,134 @@
+package main
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+// novox/hq issue 480: a delivery stopped because its walk ended done before its word without building its modules
+// (issue 474) is still read for a later merge that delivers them, and kept CoveredBy once one did. Its state stays
+// stopped — a final state never moves, as for a covered superseded member (issue 442) — but the forge's status, its
+// view, its note and `show` went on saying "stopped" for a change that reached every machine. Once covered they say
+// covered, and by which merge. And while `stalled` lists such a stop, `deliveries` lists it too, past a day.
+
+// strandedNight is theNight with #215 stopped, its walk past the grace with nothing later carrying build-agent.
+func strandedNight(t *testing.T) (*world, string) {
+	w := theNight(t)
+	id := IDOf(ctl474, head215)
+	w.later(strandedAfter + 5*time.Minute)
+	w.settleAll()
+	if d := w.delivery(id); d.State != Stopped || d.Stranded == "" {
+		t.Fatalf("#215 is %s, stranded %q", d.State, d.Stranded)
+	}
+	return w, id
+}
+
+func TestAStopALaterMergeCoversReadsCoveredByThatMerge(t *testing.T) {
+	w, id := strandedNight(t)
+	if got := statusOn(w, ctl474, head215); !strings.HasPrefix(got, "error stopped: ") {
+		t.Fatalf("stopped, its status says %q", got)
+	}
+	w.forge.contains[merge215+" in "+merge219] = true
+	by := deliverLater(w, ctl474, 219, "main", head219, merge219, w.now, walkDone, "build-agent")
+	w.later(2 * time.Minute)
+	w.settleAll()
+	d := w.delivery(id)
+	if d.State != Stopped || !strings.Contains(d.CoveredBy, by) {
+		t.Fatalf("after #219 it is %s, covered by %q", d.State, d.CoveredBy)
+	}
+	got := statusOn(w, ctl474, head215)
+	if !strings.HasPrefix(got, "success covered") || !strings.Contains(got, by) {
+		t.Fatalf("covered by %s, its status still says %q", by, got)
+	}
+	shown, err := w.h.Show(id)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if reads, _ := shown.(map[string]any)["reads"].(string); !strings.HasPrefix(reads, "covered") || !strings.Contains(reads, by) {
+		t.Fatalf("show reads %q", reads)
+	}
+	view := w.forge.views[ctl474+"#215"]
+	if !strings.Contains(view, "Covered") || !strings.Contains(view, by) {
+		t.Fatalf("its view does not say it was covered by %s:\n%s", by, view)
+	}
+	noted := false
+	for _, l := range w.forge.notesOn(merge215) {
+		noted = noted || strings.Contains(l, "covered") && strings.Contains(l, by)
+	}
+	if !noted {
+		t.Fatalf("its merge's note does not say it was covered: %v", w.forge.notesOn(merge215))
+	}
+	// Told once: further ticks owe nothing more.
+	w.later(time.Hour)
+	w.settleAll()
+	if d := w.delivery(id); len(d.Owed) != 0 || !d.CoverTold {
+		t.Fatalf("still owes %+v, told %v", d.Owed, d.CoverTold)
+	}
+}
+
+// A stop covered before this was built (CoveredBy kept, nothing told) is told after a restart, from what was kept.
+func TestACoveredStopKeptBeforeIsToldAfterARestart(t *testing.T) {
+	w, id := strandedNight(t)
+	w.h.mu.Lock()
+	d := w.h.deliveries[id]
+	d.CoveredBy = IDOf(ctl474, head219) + " (merged as " + merge219[:8] + ")"
+	if err := w.store.PutDelivery(d); err != nil {
+		t.Fatal(err)
+	}
+	w.h.mu.Unlock()
+	again := newWorldOver(t, w.store, w.ctl, w.forge, w.now.Add(time.Hour))
+	again.settleAll()
+	if got := statusOn(again, ctl474, head215); !strings.HasPrefix(got, "success covered") ||
+		!strings.Contains(got, IDOf(ctl474, head219)) {
+		t.Fatalf("after a restart its status says %q", got)
+	}
+	if d := again.delivery(id); d.State != Stopped || len(d.Transitions) != len(w.delivery(id).Transitions) {
+		t.Fatalf("a restart moved it: %s", d.State)
+	}
+}
+
+// Only a stop for a walk that never built its modules reads covered: a person's stop, or one the cover test has
+// not answered, keeps its error.
+func TestOnlyACoveredStrandedStopReadsCovered(t *testing.T) {
+	for _, d := range []*Delivery{
+		{State: Stopped, CoveredBy: "x"},            // a person's stop, with a cover found while it was held
+		{State: Stopped, Stranded: "never reached"}, // stranded, not covered
+	} {
+		if state, _ := statusOf(d); state != "error" {
+			t.Fatalf("%+v reads %s", d, state)
+		}
+		if d.coveredStop() {
+			t.Fatalf("%+v reads as a covered stop", d)
+		}
+	}
+}
+
+func TestAStopStalledListsStaysInDeliveries(t *testing.T) {
+	w, id := strandedNight(t)
+	w.later(30 * time.Hour)
+	w.settleAll()
+	listed := func() *Line {
+		for _, l := range w.h.Deliveries("", "", "", false) {
+			if l.ID == id {
+				return &l
+			}
+		}
+		return nil
+	}
+	if len(w.h.Stalled()) != 1 {
+		t.Fatalf("stalled lists %+v", w.h.Stalled())
+	}
+	l := listed()
+	if l == nil || !l.Stalled || !strings.Contains(l.Waits, "build-agent") {
+		t.Fatalf("listed by stalled, deliveries shows %+v", l)
+	}
+	// Covered, it ends like any final delivery: a day after its stop.
+	w.forge.contains[merge215+" in "+merge219] = true
+	deliverLater(w, ctl474, 219, "main", head219, merge219, w.now, walkDone, "build-agent")
+	w.later(2 * time.Minute)
+	w.settleAll()
+	if len(w.h.Stalled()) != 0 || listed() != nil {
+		t.Fatalf("covered, stalled lists %+v and deliveries %+v", w.h.Stalled(), listed())
+	}
+}

modules/mesh-delivery/cmd/mesh-delivery/main.go

@@ -192,7 +192,7 @@ func tools(h *Holder, l *listening) []stdio.Tool {
 	seat := "mesh-delivery."
 	return []stdio.Tool{
 		{Name: seat + "deliveries",
-			Description: "Every delivery not final, and those that ended in the last day, one line each: its id " +
+			Description: "Every delivery not final, those that ended in the last day, and any stop `stalled` still lists, one line each: its id " +
 				"(owner/repository@commit), its state, its group, what it waits for and since when. Narrowed by state, " +
 				"repository or group.",
 			Input: map[string]any{"type": "object", "properties": map[string]any{"state": str("one state"),
@@ -347,7 +347,8 @@ func tools(h *Holder, l *listening) []stdio.Tool {
 			}},
 		{Name: "delivery_status",
 			Description: "Whether this owner works: how many deliveries in each state, the groups, what is owed to " +
-				"the forge and the bus and not yet done, walks with no delivery yet, whether its events arrive, when " +
+				"the forge and the bus and not yet done, how many owed effects were tried since it started (done, failed " +
+				"and tried again, given up) and when the last was, walks with no delivery yet, whether its events arrive, when " +
 				"the controller's walks were last read or why they could not be, and the last refusals.",
 			Run: func(map[string]any) (any, error) { return h.Status(l.get()), nil }},
 	}

modules/mesh-delivery/cmd/mesh-delivery/model.go

@@ -68,6 +68,9 @@ type Delivery struct {
 	// Stranded says why a merge whose walk ended done before its word, without moving every module it moves, is
 	// stopped: nothing later delivered them either (novox/hq issue 474). Set once the cover test says no.
 	Stranded string `json:"stranded,omitempty"`
+	// CoverTold is whether the forge was told that such a stop was covered since: its status, its view and its note
+	// (novox/hq issue 480). Kept, so a restart tells it once, and a stop covered before this was built is told too.
+	CoverTold bool `json:"cover_told,omitempty"`
 	// TurnAwaits says, for a group member whose turn waits for a later merge to carry a superseded member before it,
 	// which merges and until when; TurnAwaitsUntil is that moment, which bounds the wait (ADR 0276 decision 9,
 	// novox/hq issue 445). `show` shows both, and `stalled` says them past that moment.
@@ -248,6 +251,20 @@ func (d *Delivery) FromForgesWord() bool {
 
 // shownOnItsPullRequest is whether its view and status are kept on its pull request: not for history, whose
 // pull request the forge may no longer hold — or holds under its number another one.
+// coveredStop is whether a delivery stopped because its walk ended done before its word without building its modules
+// (novox/hq issue 474) was covered since: a later merge into its trunk that contains it was delivered, carrying every
+// module it moves to every machine running it (ADR 0270's cover test, kept as CoveredBy). Its state stays stopped —
+// final, as a covered superseded member stays superseded (issue 442) — and it reads covered, by that merge (novox/hq
+// issue 480). A stop for any other reason never reads covered.
+func (d *Delivery) coveredStop() bool {
+	return d.State == Stopped && d.Stranded != "" && d.CoveredBy != ""
+}
+
+// coveredStopSaid is how a covered stop reads: on the forge's status, in its view and note, and in `show`.
+func (d *Delivery) coveredStopSaid() string {
+	return "covered after its stop: a later merge that contains it was delivered: " + d.CoveredBy
+}
+
 func (d *Delivery) shownOnItsPullRequest() bool {
 	return d.Number > 0 && d.History == "" && d.State != Retired
 }

modules/mesh-delivery/cmd/mesh-delivery/unchecked.go

@@ -250,8 +250,8 @@ func (h *Holder) uncheckedLines(now time.Time) []StalledLine {
 			h2 = "none: its delivery is " + string(u.held) + ", a state the operator moves — the operator's"
 		}
 		out = append(out, StalledLine{ID: id, Number: u.pull.Number, State: state, For: now.Sub(u.first).Round(time.Second).String(),
-			Bound: u.bound().String(),
-			H2:    h2, Says: says, Waiting: waiting})
+			Bound: u.bound().String(), Held: u.held,
+			H2: h2, Says: says, Waiting: waiting})
 	}
 	return out
 }

modules/mesh-delivery/cmd/mesh-delivery/verbs.go

@@ -71,6 +71,11 @@ func (h *Holder) waitsFor(d *Delivery) string {
 		if d.Walk != nil {
 			return "its walk: " + clip(d.Walk.Note, 120)
 		}
+	case Stopped:
+		if strandedUncovered(d) {
+			return "a later delivered merge to carry " + strings.Join(d.notMovedBy(), ", ") + ": it is stopped, and " +
+				"listed by stalled until one does (novox/hq issue 480)"
+		}
 	}
 	return ""
 }
@@ -86,7 +91,8 @@ func (h *Holder) Deliveries(state, repository, group string, all bool) []Line {
 			group != "" && d.Group != group {
 			continue
 		}
-		if d.State.Final() && !all && now.Sub(d.Since) > 24*time.Hour {
+		// A final delivery `stalled` still lists stays, however old: the two never disagree (novox/hq issue 480).
+		if d.State.Final() && !all && now.Sub(d.Since) > 24*time.Hour && !strandedUncovered(d) {
 			continue
 		}
 		l := Line{ID: d.ID, State: d.State, Since: d.Since.UTC().Format(time.RFC3339), For: now.Sub(d.Since).Round(time.Second).String(),
@@ -97,7 +103,7 @@ func (h *Holder) Deliveries(state, repository, group string, all bool) []Line {
 		if d.Walk != nil {
 			l.Walk = d.Walk.ID
 		}
-		l.Stalled = pastBound(d, now)
+		l.Stalled = pastBound(d, now) || strandedUncovered(d)
 		out = append(out, l)
 	}
 	sort.Slice(out, func(i, j int) bool {
@@ -115,6 +121,9 @@ func (h *Holder) Show(id string) (any, error) {
 	defer h.mu.Unlock()
 	if d := h.deliveries[id]; d != nil {
 		out := map[string]any{"delivery": d, "waits": h.waitsFor(d)}
+		if d.coveredStop() {
+			out["reads"] = d.coveredStopSaid() // stopped, and its change reached the machines (novox/hq issue 480)
+		}
 		if g := h.groups[d.Group]; g != nil {
 			state, why := GroupState(g, h.membersOf(g))
 			out["group"] = map[string]any{"group": g, "state": state, "why": why}
@@ -190,10 +199,14 @@ type StalledLine struct {
 	// the operator's own zone, which it cannot do inside a finished sentence (novox/hq issue 443). Waiting stays
 	// beside them for a controller that does not read them yet.
 	Checks []WaitingCheck `json:"checks,omitempty"`
-	For    string         `json:"for"`
-	Bound  string         `json:"bound"`
-	H2     string         `json:"h2"`
-	Says   string         `json:"says"`
+	// Held is the state of the delivery a line of the state Unanswered is about, ready or rejected, when one is held
+	// here (novox/hq issues 441, 451): its check answered once, so the controller advises a recheck of it rather than
+	// the build queue, reading the state here and never from Says. Empty for a head with no delivery.
+	Held  State  `json:"held,omitempty"`
+	For   string `json:"for"`
+	Bound string `json:"bound"`
+	H2    string `json:"h2"`
+	Says  string `json:"says"`
 }
 
 // Stalled is the `stalled` verb: what the controller's self-check raises as `delivery.<id>.stalled`.
@@ -635,6 +648,15 @@ func (h *Holder) Status(listening string) map[string]any {
 	out := map[string]any{"deliveries": byState, "groups": len(h.groups), "owed": owed, "unkept": len(h.dirty),
 		"walks-unmatched": len(h.unmatched), "events": listening, "started": h.started.Format(time.RFC3339),
 		"seat-on-record": h.held}
+	// The owed effects tried since this owner started (novox/hq issue 407): done, failed and to be tried again,
+	// or given up, and when the last was tried. A count since the start, said with that start: two readings in
+	// one run give a window's tries.
+	tried := map[string]any{"since": h.started.Format(time.RFC3339), "done": h.tried.done, "failed": h.tried.failed,
+		"given-up": h.tried.givenUp, "tried": h.tried.done + h.tried.failed + h.tried.givenUp}
+	if !h.tried.last.IsZero() {
+		tried["last"] = h.tried.last.Format(time.RFC3339)
+	}
+	out["owed-tried"] = tried
 	// Each held delivery by name, with why and the verb that releases it (novox/hq issue 529): a count alone
 	// pointed a reader at nothing.
 	var held []string

modules/mesh-issues/README.md

@@ -134,9 +134,12 @@ carries `abandoned` on `get` and its `list` row, beside its `worker`. A move by
 `take-over`'s reason, as any stale worker; the answer, the note and the `moved` event say it was abandoned
 (`abandoned`).
 
-Every five minutes the module looks for a fix merged and not delivered after `stuck-after` (default `2h`): it is
-said once — a note on the issue and a warning on the operator's channel (`seat:operator-channel.notify`, key
-`issue-tracker.fix-stuck.<number>`), cleared there when every fix of the issue is delivered. A module that runs only
+Every five minutes the module looks for a fix merged and not delivered after `stuck-after` (default `2h`) of an
+issue not closed: it is said once — a note on the issue and a warning on the operator's channel
+(`seat:operator-channel.notify`, key `issue-tracker.fix-stuck.<number>`), cleared there when every fix of the issue
+is delivered or the issue is closed. Resolved is the end of the warning as wontfix is: its worker proved the
+acceptance live, so a fix whose own walk failed and that a later merge carried is not waited for (hq issue 547). An
+issue resolved or wontfix is never said stuck. A module that runs only
 its bundle cannot raise a controller condition (hq ADR 0240 rule 8, ADR 0256), so the warning is the channel's, not the controller's.
 
 ## The import of hq's issues (slice 3)

modules/mesh-issues/cmd/mesh-issues/delivery.go

@@ -266,9 +266,11 @@ func (t *Tracker) afterFix(n uint64) error {
 }
 
 // stillStuck says whether an issue has a fix said stuck that is still named, not delivered, and the issue not
-// closed as wontfix.
+// closed. A closed issue is the end of its warning: resolved means its worker proved the acceptance live, so a fix
+// the tracker never heard delivered is not waited for any more (a failed walk that a later merge carried stays
+// failed, novox/hq issue 547), and wontfix waits for nothing.
 func stillStuck(is *Issue) bool {
-	if is.Status == StatusWontfix {
+	if closedStatus(is.Status) {
 		return false
 	}
 	named := liveFixes(is)
@@ -281,19 +283,30 @@ func stillStuck(is *Issue) bool {
 }
 
 // clearStuck clears the warning said for an issue on the operator's channel once nothing it was said for is
-// stuck — delivered, no longer named, or the issue closed as wontfix; one that fails is tried again at the next
-// sweep.
+// stuck — delivered, no longer named, or the issue closed (resolved or wontfix); one that fails is tried again at
+// the next sweep.
 func (t *Tracker) clearStuck(is *Issue) error {
 	if !is.StuckOpen || stillStuck(is) || t.Notify == nil {
 		return nil
 	}
-	if err := t.Notify(stuckKey(is.Number), "", "", "", "", "the fix of issue "+keyOf(is.Number)+" is delivered or no longer waited for", true); err != nil {
+	if err := t.Notify(stuckKey(is.Number), "", "", "", "", stuckEnded(is), true); err != nil {
 		return err
 	}
 	_, err := t.change(is.Number, Act{Op: "warned", By: Seat}, func(i *Issue) error { i.StuckOpen = false; return nil })
 	return err
 }
 
+// stuckEnded is what the operator's channel says when a stuck warning ends.
+func stuckEnded(is *Issue) string {
+	switch is.Status {
+	case StatusResolved:
+		return "resolved: issue " + keyOf(is.Number) + " was proven live by its worker"
+	case StatusWontfix:
+		return "issue " + keyOf(is.Number) + " was closed as wontfix: its fix is no longer waited for"
+	}
+	return "the fix of issue " + keyOf(is.Number) + " is delivered or no longer waited for"
+}
+
 func stuckKey(n uint64) string { return "issue-tracker.fix-stuck." + keyOf(n) }
 
 func prKey(repository string, number int) string {
@@ -453,7 +466,7 @@ func (t *Tracker) stuckAfter() time.Duration {
 	return DefaultStuckAfter
 }
 
-// Sweep says every fix merged and not delivered past the bound: a note on its issue and a warning on the
+// Sweep says every fix of an issue not closed merged and not delivered past the bound: a note on its issue and a warning on the
 // operator's channel, once; and every issue in fixing whose fixes were all delivered past its own bound and is not
 // resolved (novox/hq issue 483). First it asks the delivery of a few fixes never heard of. It answers how many
 // warnings it said. Run every few minutes.
@@ -474,15 +487,13 @@ func (t *Tracker) Sweep() (int, error) {
 		} else if ok {
 			said++
 		}
-		if is.Status == StatusWontfix {
-			if err := t.clearStuck(is); err != nil {
-				t.Logf("[mesh-issues] the stuck fix of %d could not be cleared on the operator's channel: %v", n, err)
-			}
-			continue
-		}
 		if err := t.clearStuck(is); err != nil {
 			t.Logf("[mesh-issues] the stuck fix of %d could not be cleared on the operator's channel: %v", n, err)
 		}
+		if closedStatus(is.Status) {
+			// A resolved or wontfix issue waits for no fix: never said stuck (novox/hq issue 547).
+			continue
+		}
 		named := liveFixes(is)
 		for _, f := range is.Fixes {
 			if !contains(named, f.PullRequest) || contains(is.Delivered, f.PullRequest) || !f.Merged || f.MergedAt == nil ||

modules/mesh-issues/cmd/mesh-issues/delivery_test.go

@@ -11,10 +11,22 @@ import (
 )
 
 type notified struct {
-	mu    sync.Mutex
-	said  []string
-	clear []string
-	err   error
+	mu       sync.Mutex
+	said     []string
+	clear    []string
+	resolved []string
+	err      error
+}
+
+// fixedAtFixing names a fix while the issue stays at fixing, as an agent does when the fix merges (ADR 0281 §3,
+// ADR 0284): a fix stuck is said only for an issue not closed (issue 547).
+func fixedAtFixing(t *testing.T, h *harness, n uint64, fixedBy ...string) {
+	t.Helper()
+	h.fixing(t, n)
+	if _, err := h.Move(MoveAsk{Number: n, Status: StatusFixing, By: "fix@g14", LocatedIn: []string{"mesh-catalog modules/records"},
+		FixedBy: fixedBy}); err != nil {
+		t.Fatal(err)
+	}
 }
 
 func (n *notified) notify(key, severity, summary, headline, explanation, resolved string, clear bool) error {
@@ -25,6 +37,7 @@ func (n *notified) notify(key, severity, summary, headline, explanation, resolve
 	}
 	if clear {
 		n.clear = append(n.clear, key)
+		n.resolved = append(n.resolved, resolved)
 	} else {
 		n.said = append(n.said, key+" "+severity+" "+summary)
 	}
@@ -121,7 +134,7 @@ func TestAnIssueKnowsWhetherItsFixIsDelivered(t *testing.T) {
 func TestAStuckFixIsSaidOnceAndClearedWhenDelivered(t *testing.T) {
 	h := newHarness(t)
 	n := h.open(t, "the counter skips a number")
-	resolve(t, h, n, "mesh-catalog#9")
+	fixedAtFixing(t, h, n, "mesh-catalog#9")
 	note := &notified{}
 	h.Notify = note.notify
 	merged := time.Date(2026, 10, 10, 9, 0, 0, 0, time.UTC) // three hours before the harness's clock
@@ -152,7 +165,7 @@ func TestAStuckFixIsSaidOnceAndClearedWhenDelivered(t *testing.T) {
 	// Under the bound nothing is said.
 	h2 := newHarness(t)
 	m := h2.open(t, "y")
-	resolve(t, h2, m, "mesh-catalog#9")
+	fixedAtFixing(t, h2, m, "mesh-catalog#9")
 	n2 := &notified{}
 	h2.Notify = n2.notify
 	transition(t, h2, 9, "delivering", "", "abc", time.Date(2026, 10, 10, 11, 30, 0, 0, time.UTC))
@@ -194,7 +207,8 @@ func TestAFixIsNamedWhileTheIssueStaysLocated(t *testing.T) {
 func TestDeliveredStaysDeliveredAndClearsAreRetried(t *testing.T) {
 	h := newHarness(t)
 	n := h.open(t, "x")
-	resolve(t, h, n, "mesh-catalog#9")
+	fixedAtFixing(t, h, n, "mesh-catalog#9")
+	h.settings.DeliveredNotResolvedAfter = "24h" // only the stuck warning is under test here
 	note := &notified{}
 	h.Notify = note.notify
 	merged := time.Date(2026, 10, 10, 9, 0, 0, 0, time.UTC)
@@ -244,3 +258,78 @@ func TestDeliveredStaysDeliveredAndClearsAreRetried(t *testing.T) {
 		t.Fatalf("%d asks, %q", asks, v.Delivery)
 	}
 }
+
+// A resolved issue is the end of its stuck warning, as wontfix is: resolving clears it on the operator's channel,
+// saying so, and the sweep never says a fix stuck for an issue resolved or wontfix, even one whose delivery failed
+// and never reads delivered (issue 547).
+func TestAResolvedIssueEndsItsStuckWarningAndIsNeverSaidStuck(t *testing.T) {
+	merged := time.Date(2026, 10, 10, 9, 0, 0, 0, time.UTC) // three hours before the harness's clock
+	moved := func(t *testing.T, h *harness, n uint64) {
+		t.Helper()
+		raw, _ := json.Marshal(map[string]any{"number": n})
+		if err := h.OnMoved(stdio.Envelope{Body: raw}); err != nil {
+			t.Fatal(err)
+		}
+	}
+	for _, to := range []string{StatusResolved, StatusWontfix} {
+		t.Run(to, func(t *testing.T) {
+			h := newHarness(t)
+			n := h.open(t, "the counter skips a number")
+			fixedAtFixing(t, h, n, "mesh-catalog#9")
+			note := &notified{}
+			h.Notify = note.notify
+			transition(t, h, 9, "failed", "the gate failed on one machine", "abc", merged)
+			if said, err := h.Sweep(); err != nil || said != 1 || len(note.said) != 1 {
+				t.Fatalf("not said stuck: %d %v %q", said, err, note.said)
+			}
+			ask := MoveAsk{Number: n, Status: to, FixedBy: []string{"mesh-catalog#9"}, ReplayNone: "proven live"}
+			if to == StatusWontfix {
+				ask = MoveAsk{Number: n, Status: to, Reason: "not worth it"}
+			}
+			if _, err := h.Move(ask); err != nil {
+				t.Fatal(err)
+			}
+			moved(t, h, n)
+			if len(note.clear) != 1 || note.clear[0] != stuckKey(n) || get(t, h, n).StuckOpen {
+				t.Fatalf("not cleared at the move: %q", note.clear)
+			}
+			if to == StatusResolved && !strings.HasPrefix(note.resolved[0], "resolved: ") {
+				t.Fatalf("%q", note.resolved)
+			}
+			if said, _ := h.Sweep(); said != 0 || len(note.said) != 1 || len(note.clear) != 1 {
+				t.Fatalf("said again after %s: %d %q, cleared %q", to, said, note.said, note.clear)
+			}
+		})
+	}
+	// A warning left open by a tracker that kept it for a resolved issue is cleared at the first sweep, and an
+	// issue resolved before its fix was ever said stuck is never said stuck.
+	h := newHarness(t)
+	n := h.open(t, "x")
+	fixedAtFixing(t, h, n, "mesh-catalog#9")
+	note := &notified{err: errStuck}
+	h.Notify = note.notify
+	transition(t, h, 9, "failed", "the gate failed", "abc", merged)
+	if _, err := h.change(n, Act{Op: "warned", By: Seat}, func(i *Issue) error {
+		i.Fixes[0].StuckSaid, i.StuckOpen = true, true
+		return nil
+	}); err != nil {
+		t.Fatal(err)
+	}
+	if _, err := h.Move(MoveAsk{Number: n, Status: StatusResolved, FixedBy: []string{"mesh-catalog#9"}}); err != nil {
+		t.Fatal(err)
+	}
+	moved(t, h, n) // the channel does not answer: kept open, tried at the sweep
+	note.err = nil
+	if said, _ := h.Sweep(); said != 0 || len(note.clear) != 1 || get(t, h, n).StuckOpen {
+		t.Fatalf("said %d, cleared %q", said, note.clear)
+	}
+	m := h.open(t, "y")
+	fixedAtFixing(t, h, m, "mesh-catalog#10")
+	transition(t, h, 10, "failed", "the gate failed", "abc", merged)
+	if _, err := h.Move(MoveAsk{Number: m, Status: StatusResolved, FixedBy: []string{"mesh-catalog#10"}}); err != nil {
+		t.Fatal(err)
+	}
+	if said, _ := h.Sweep(); said != 0 || len(note.said) != 0 {
+		t.Fatalf("a resolved issue said stuck: %q", note.said)
+	}
+}

modules/mesh-knowledge/README.md

@@ -23,7 +23,7 @@ operator, it is accepted only on the operator's Approve, given on a channel that
 | `reserve` | `kind`, `for` | the next decision or research number, asked of the issue tracker (`issue-tracker.reserve`); spent whether or not its record is accepted |
 | `propose` | the record whole | proposed, or refused naming every rule it breaks; an accepted record changes only by a progressive insight (`insight`). Each version proposed is then reviewed by the knowledge base itself (below) |
 | `import` | `dry-run`, `commit` | hq's decision records and research efforts at the commit the records module stands at, each whole at its own number |
-| `return` | `number`, `reason` | drafted clauses sent back to be drafted again |
+| `return` | `number`, `reason` | drafted clauses sent back to be drafted again; refused for a record whose clauses another record changed or links by number |
 
 `ask`, `get`, `holds` and `history` stay within `bound` bytes (4096 unless asked for, at most 65536) and say what they cut
 and how to read the rest. The module's own tool `knowledge_health` answers its health (below).
@@ -78,7 +78,7 @@ as text. `get` serves each, and any other field a record of hq wrote under `fiel
    - 25 on the structure: kind, reserved number, title, topic, date, deciders, research status, at least one
      clause, clause numbering, bold lead, clause size, the Context, Consequences and "How it is checked" sections,
      a research effort's overview, link kind, link target, link fit, no link to itself, what it extends, what it
-     supersedes or changes is accepted, a changed clause is in force, a superseded record cited beside its
+     supersedes or changes is accepted, a changed clause is in force or changed (a drafted one too), a superseded record cited beside its
      superseder, a graduated effort says what it became, and the links in its text resolve;
    - 4 on the prose: no word the glossary retired, no daemon's line, a deferral names its tracking issue, and a
      progressive insight in the dated, marked form.
@@ -178,6 +178,12 @@ the older clause marked `changed`. When every prose record of a topic has been t
 operator is told once (`operator-channel.notify`, a warning) with the counts. `return` sends a record back to be
 drafted again.
 
+A drafted clause may be changed by a later record (`changes 0281 §9`, novox/hq issue 494, ADR 0321): on its acceptance the
+clause is marked `changed` with the change named, keeps its number and stays `drafted`, so it is still never served
+as in force, and `get` says both. A redraft numbers a record's clauses anew, so `return` refuses a record any of
+whose clauses another record changed or links by number, served or proposed, naming each link: a link never comes
+to point at another clause.
+
 ## Where it keeps its records
 
 In a database in the store: the module requires a `postgres-database` provision named `knowledge`, as

modules/mesh-knowledge/cmd/mesh-knowledge/answers.go

@@ -70,6 +70,13 @@ func held(r *Record, c Clause) string {
 		if c.Unconfirmed != "" {
 			s += " (the second judgement did not confirm it: " + c.Unconfirmed + ")"
 		}
+		if len(c.ChangedBy) > 0 {
+			if c.Status == ClauseSuperseded {
+				s += "; superseded by " + strings.Join(c.ChangedBy, ", ")
+			} else {
+				s += "; changed by " + strings.Join(c.ChangedBy, ", ") + ": read both"
+			}
+		}
 		return s
 	case r.Status == StatusProposed || c.Status == ClauseProposed:
 		return "proposed: not in force"

modules/mesh-knowledge/cmd/mesh-knowledge/draft.go

@@ -503,6 +503,15 @@ func (k *KB) Return(caller string, key Key, reason string) (map[string]any, erro
 	if r.Drafting == nil {
 		return nil, fmt.Errorf("%s's clauses were written by its author, not drafted: a written clause is changed by a new record", key)
 	}
+	all, err := k.Store.All(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if held := clauseHolds(r, all); len(held) > 0 {
+		return nil, fmt.Errorf("%s is not returned: drafting it again would number its clauses anew, and these hold them to their numbers: %s. "+
+			"A clause keeps its number once another record links it (novox/hq issue 494). To say a drafted clause is wrong "+
+			"or no longer holds, propose a record that changes it (changes %s §N)", key, strings.Join(held, "; "), strings.TrimPrefix(key.String(), "ADR "))
+	}
 	r.Clauses = nil
 	r.Drafting = &Drafting{State: DraftWaiting, Returned: reason, At: k.now()}
 	why := "returned to be drafted again: " + reason
@@ -512,3 +521,36 @@ func (k *KB) Return(caller string, key Key, reason string) (map[string]any, erro
 	k.emit(EventReturned, r, caller, why, e.Versions+1)
 	return map[string]any{"record": key.String(), "says": fmt.Sprintf("%s's clauses are taken back and will be drafted again, with your reason; until then it serves none.", key)}, nil
 }
+
+// clauseHolds is what holds a record's clauses to their numbers: each clause another record changed or superseded,
+// and each link of another record, served or proposed, that names one of its clauses. A redraft numbers the clauses
+// anew, so a record any of these name is never returned: its links would point at other clauses.
+func clauseHolds(r *Record, all []*Entry) []string {
+	var out []string
+	for _, c := range r.Clauses {
+		if len(c.ChangedBy) > 0 && (c.Status == ClauseChanged || c.Status == ClauseSuperseded) {
+			out = append(out, fmt.Sprintf("§%d is %s by %s", c.N, c.Status, strings.Join(c.ChangedBy, ", ")))
+		}
+	}
+	key := r.Key()
+	seen := map[string]bool{}
+	for _, e := range all {
+		for _, v := range []*Record{e.Current, e.Pending} {
+			if v == nil || v.Key() == key || v.Status == StatusWithdrawn {
+				continue
+			}
+			for _, l := range v.Links {
+				to, ok := l.To.Record()
+				if !ok || to != key || l.To.Clause == 0 {
+					continue
+				}
+				s := fmt.Sprintf("%s (%s) %s §%d", v.Key(), v.Status, l.Kind, l.To.Clause)
+				if !seen[s] {
+					seen[s] = true
+					out = append(out, s)
+				}
+			}
+		}
+	}
+	return out
+}

modules/mesh-knowledge/cmd/mesh-knowledge/issue494_test.go

@@ -0,0 +1,108 @@
+package main
+
+import (
+	"context"
+	"strings"
+	"testing"
+)
+
+// novox/hq issue 494: a record may change a clause the knowledge base holds only as drafted, and a record whose
+// clauses another record links by number is never drafted again, so no link ever points at another clause.
+
+// draftedNotConfirmed drafts 0240 and has the second judgement reject its first clause: it stays drafted.
+func draftedNotConfirmed(t *testing.T, w *world) Key {
+	t.Helper()
+	k := Key{KindDecision, 240}
+	draftUntil(t, w, k, DraftDrafted)
+	e := mustGet(t, w.k.Store, k)
+	r := e.Current.Clone()
+	r.Clauses[0].Text += " NOT EXACT"
+	if err := w.k.Store.Save(context.Background(), Version{By: "test", Why: "a draft the checker will reject", Record: r}, true, false, e.Revision); err != nil {
+		t.Fatal(err)
+	}
+	r = draftUntil(t, w, k, DraftDone)
+	if r.Clauses[0].Source != SourceDrafted || !r.Accepted() {
+		t.Fatalf("0240 §1 is not a drafted clause of an accepted record: %s %+v", r.Status, r.Clauses[0])
+	}
+	return k
+}
+
+func TestARecordMayChangeAClauseHeldOnlyAsDrafted(t *testing.T) {
+	eachStore(t, func(t *testing.T, s Store) {
+		w := imported(t, s)
+		k := draftedNotConfirmed(t, w)
+		n := w.reserved(t, "author@test")
+		p := valid(n)
+		p.Links = append(p.Links, LinkAsk{Kind: LinkChanges, To: "0240 §1", From: 2})
+		if _, err := w.k.Propose("author@test", p); err != nil {
+			t.Fatalf("a change of a drafted clause was refused: %v", err)
+		}
+		w.reviewAll(t)
+		if e := mustGet(t, s, Key{KindDecision, n}); !e.Current.Accepted() {
+			t.Fatalf("not accepted: %s", e.Current.Status)
+		}
+		// The drafted clause is changed by it, keeps its number and stays drafted: still never served as in force.
+		r := mustGet(t, s, k).Current
+		c := r.Clause(1)
+		want := itoa4(n) + " §2"
+		if c == nil || c.Status != ClauseChanged || c.Source != SourceDrafted || len(c.ChangedBy) != 1 || !strings.HasSuffix(c.ChangedBy[0], want) {
+			t.Fatalf("0240 §1 after the change: %+v", c)
+		}
+		if Served(r, *c) {
+			t.Fatal("a drafted clause that was changed is served as holding")
+		}
+		g, err := w.k.Get(GetAsk{Kind: KindDecision, Number: 240})
+		if err != nil {
+			t.Fatal(err)
+		}
+		if h := g.Clauses[0].Holds; !strings.HasPrefix(h, "drafted, not confirmed") || !strings.Contains(h, "changed by ADR "+want) {
+			t.Fatalf("get says of 0240 §1: %q", h)
+		}
+		// The whole-set rules find nothing wrong with the change.
+		f, _ := s.Findings(context.Background())
+		for _, x := range f {
+			if x.Rule == "partial" {
+				t.Fatalf("a whole-set finding: %+v", x)
+			}
+		}
+	})
+}
+
+func TestARecordWhoseClausesAreLinkedByNumberIsNeverReturned(t *testing.T) {
+	eachStore(t, func(t *testing.T, s Store) {
+		w := imported(t, s)
+		k := draftedNotConfirmed(t, w)
+		// A proposed record cites 0240 §2: returning 0240 would point it at whatever is drafted second next time.
+		n := w.reserved(t, "author@test")
+		p := valid(n)
+		p.Links = append(p.Links, LinkAsk{Kind: LinkCites, To: "0240 §2", From: 1})
+		w.judge.review = `{"verdict":"changes","findings":["not yet"]}`
+		if _, err := w.k.Propose("author@test", p); err != nil {
+			t.Fatal(err)
+		}
+		w.reviewAll(t)
+		before := mustGet(t, s, k)
+		_, err := w.k.Return("operator@shanks", k, "clause 1 says more than the section")
+		if err == nil {
+			t.Fatal("a record a proposed record links by clause was returned")
+		}
+		if !strings.Contains(err.Error(), "ADR "+itoa4(n)+" (proposed) cites §2") || !strings.Contains(err.Error(), "changes 0240 §N") {
+			t.Fatalf("the refusal does not say what holds the clauses or the way forward: %v", err)
+		}
+		after := mustGet(t, s, k)
+		if after.Versions != before.Versions || len(after.Current.Clauses) != len(before.Current.Clauses) || len(w.said.of(EventReturned)) != 0 {
+			t.Fatalf("a refused return changed 0240: %d versions (was %d), %d clauses", after.Versions, before.Versions, len(after.Current.Clauses))
+		}
+
+		// A clause another record changed holds the record to its numbers too, with no link left to scan.
+		w2 := imported(t, newMemStore())
+		k2 := draftedNotConfirmed(t, w2)
+		n2 := w2.reserved(t, "author@test")
+		p2 := valid(n2)
+		p2.Links = append(p2.Links, LinkAsk{Kind: LinkChanges, To: "0240 §1", From: 2})
+		w2.accepted(t, "author@test", p2)
+		if _, err := w2.k.Return("operator@shanks", k2, "again"); err == nil || !strings.Contains(err.Error(), "§1 is changed by ADR "+itoa4(n2)+" §2") {
+			t.Fatalf("a record with a changed clause was returned, or the refusal does not name the change: %v", err)
+		}
+	})
+}

modules/mesh-knowledge/cmd/mesh-knowledge/main.go

@@ -1010,7 +1010,8 @@ func Tools(k *KB, caller func(map[string]any) string) []stdio.Tool {
 		{Name: Seat + ".return",
 			Description: "Send the clauses drafted from a prose decision back to be drafted again, with your reason, which the next " +
 				"drafting reads. Until they are drafted and confirmed again the record serves none. Refused: a record whose clauses its " +
-				"author wrote, an empty reason.",
+				"author wrote, an empty reason, and a record whose clauses another record changed or links by number (a redraft " +
+				"numbers them anew; a record that changes the drafted clause says it is wrong instead).",
 			Input: schema([]string{"number", "reason"}, map[string]any{"kind": kindArg(), "number": integer("the record's number"),
 				"reason": text("what is wrong with the drafted clauses")}),
 			Run: func(m map[string]any) (any, error) {

modules/mesh-knowledge/cmd/mesh-knowledge/rules.go

@@ -48,7 +48,7 @@ var PerRecordRules = []Rule{
 	{"self-link", "no link points at the record itself", "records.py supersession"},
 	{"rests-on", "a record it extends is accepted or proposed, never superseded or withdrawn", "records.py rests-on"},
 	{"supersedes-accepted", "a record it supersedes or changes is accepted", "records.py supersession, partial-supersession"},
-	{"changes-in-force", "a clause it changes is in force or changed, never superseded, proposed or drafted", "records.py partial-supersession"},
+	{"changes-in-force", "a clause it changes is in force or changed, never superseded or proposed; a drafted one may be changed", "records.py partial-supersession"},
 	{"live-citation", "a superseded record it cites is cited beside the record that replaced it", "records.py live-citation"},
 	{"became", "a graduated research effort names what it became", "cycle.py research"},
 	{"text-links", "every link its text writes to a decision record or research effort names one the knowledge base holds", "records.py links"},
@@ -261,8 +261,10 @@ func JudgeRecord(r *Record, held *Entry, lookup Lookup, ref *Reference) []Refusa
 			if !target.Accepted() || target.Status == StatusSuperseded {
 				refuse("supersedes-accepted", "%s changes %s, which is %s, not accepted", self, to, target.Status)
 			} else if c := target.Clause(l.To.Clause); c != nil {
-				if (c.Status != ClauseInForce && c.Status != ClauseChanged) || c.Source == SourceDrafted {
-					refuse("changes-in-force", "%s changes %s §%d, which is %s (%s)", self, to, l.To.Clause, c.Status, c.Source)
+				// A drafted clause may be changed (novox/hq issue 494, ADR 0321): the change is recorded against the clause the
+				// knowledge base holds, by its number, which nothing renumbers once another record links it (Return).
+				if c.Status != ClauseInForce && c.Status != ClauseChanged {
+					refuse("changes-in-force", "%s changes %s §%d, which is %s", self, to, l.To.Clause, c.Status)
 				}
 			}
 		case LinkCites:

modules/mesh-reads/README.md

@@ -1,52 +0,0 @@
-# mesh-reads
-
-A node's files and accounts, read through the mesh (novox/hq ADR 0310, extending ADR 0268 §5; hq to-be 41
-WP8; issue 418). It holds the node seat `node-reads` on every node, the control-node included, so reading a
-file, searching one, listing a directory, the owner and mode of each component of a path and looking up an
-account or a group never go through the login shell's `execute`, and an approval is asked for an act, never
-for a read.
-
-## Who it reads as
-
-The account `mesh-reads`, which this module makes on every node (`runs-as`, ADR 0259 §8): no login shell, a
-home of its own under `/var/lib`, and no group beside its own. The tool runner serves it in a runtime of its
-own, on its own bus credential, never the machine's runtime, which runs as the operator's account. So the
-node's file modes bound what it sees: a file only the operator, root or a module's own account may read is
-refused by its mode, and the answer says so. It refuses every read when it finds itself running as root.
-
-## What it refuses by name
-
-Before any read, whatever the file modes would allow (ADR 0310 §5):
-
-- **The places the mesh keeps a secret on this node**, which the controller composes from the manifests
-  and gives it as `MESH_SECRET_PLACES`: the directory of every module's own secret (its bus credential
-  among them), every credential file and grant directory, the vault's directories, and where the
-  operator-sealed secrets are kept. Without that list the module does not start.
-- **The known credential files of a machine's programs** (`refuse.go`): an account's `.ssh`, `.gnupg`,
-  `.aws`, `.kube`; the agent's `.credentials.json`, `.netrc`, `.pgpass`, `.git-credentials`; private key
-  names (`id_ed25519`, `*.key`, `ssh_host_*_key`); `/etc/shadow`; `/etc/ssl/private`, `/etc/wireguard`
-  and the network manager's connections.
-
-A link is judged by where it leads as well as by its name. `stat` and `readlink` say a secret place's owner
-and mode, and mark it, because those are not its content; `list`, `read` and `search` refuse it.
-
-## The content rule
-
-Every answer passes the content rule's secret class, from `mesh-sdk`'s `outward` package (ADR 0310 §4): a
-line of a file or a matching line shaped like a secret is withheld and its number said, as is a link target
-or an account's words. A path and an entry's name are not judged: they are what the caller named or what the
-file system calls a thing, and the rule would take a temporary directory's or a container layer's name for a
-token.
-
-## Its verbs and their bounds
-
-| verb | replaces | bounds |
-|---|---|---|
-| `stat` | `stat`, `ls -ld`, `namei -l`, `findmnt -T` | 200 paths, 64 components each; links followed only with `follow` |
-| `readlink` | `readlink`, `readlink -f`, `realpath` | one path |
-| `list` | `ls`, `ls -la` | 2000 entries, cut and said |
-| `read` | `cat`, `head`, `tail`, `less` | 64 KiB, or up to 256 KiB when asked; cut at a line and said; text only |
-| `search` | `grep`, `grep -r`, `grep -F` | a fixed string; 100 matches (500 asked), 4 deep (8 asked), 5000 files, 4 MiB a file, 20 seconds; the bound met is said |
-| `account` | `getent passwd`, `getent group`, `id`, `groups` | 2000 accounts and groups; never a password field |
-
-No answer is larger than 1 MiB. Nothing here writes a file.

modules/mesh-reads/cmd/mesh-reads/main.go

@@ -1,204 +0,0 @@
-// mesh-reads (novox/hq ADR 0310, to-be 41 WP8): the holder of node-reads. A node's files and accounts read
-// through the mesh — the owner and mode of each component of a path, a link, a directory, a text file, a search
-// by fixed string, an account or a group — so these reads never go through the login shell's execute.
-//
-// It runs as an account of its own, mesh-reads, served by the tool runner in a runtime of its own (ADR 0259
-// §8): in no group that holds a secret, with no login shell and no home of the operator's, so the node's file
-// modes bound what it sees. On top, it refuses by name the places a secret is kept (refuse.go) and withholds
-// any piece of an answer shaped like a secret (mesh-sdk's outward). Read-only: nothing here writes a file.
-//
-// stdout is the MCP channel; what this module says, it says on stderr.
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"strconv"
-	"strings"
-
-	stdio "git.novox.be/novox/mesh-sdk/go"
-)
-
-// Seat is the role this module holds.
-const Seat = "node-reads"
-
-// PlacesWord is where the controller names this node's secret places (novox/hq ADR 0310 §5).
-const PlacesWord = "MESH_SECRET_PLACES"
-
-func main() {
-	places, err := placesFrom(os.Getenv(PlacesWord))
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "[mesh-reads] %v\n", err)
-		os.Exit(1)
-	}
-	if err := stdio.Serve("", tools(newReader(places))); err != nil {
-		fmt.Fprintf(os.Stderr, "[mesh-reads] %v\n", err)
-		os.Exit(1)
-	}
-}
-
-// placesFrom reads the controller's list. Absent is refused: without it, a module's own-secret directory
-// would be read wherever the account's modes allow, and a refusal the decision promises would be silent.
-func placesFrom(raw string) ([]string, error) {
-	if strings.TrimSpace(raw) == "" {
-		return nil, fmt.Errorf("%s is not given, so this node's secret places are unknown and nothing would be "+
-			"refused by them (novox/hq ADR 0310 §5): a controller that knows node-reads composes it", PlacesWord)
-	}
-	var places []string
-	if err := json.Unmarshal([]byte(raw), &places); err != nil {
-		return nil, fmt.Errorf("%s is not a list of paths: %v", PlacesWord, err)
-	}
-	return places, nil
-}
-
-func str(description string) map[string]any {
-	return map[string]any{"type": "string", "description": description}
-}
-
-func arg(a map[string]any, k string) string {
-	switch v := a[k].(type) {
-	case string:
-		return strings.TrimSpace(v)
-	case float64:
-		return strconv.FormatFloat(v, 'f', -1, 64)
-	case bool:
-		return strconv.FormatBool(v)
-	}
-	return ""
-}
-
-func number(a map[string]any, k string) (int, error) {
-	s := arg(a, k)
-	if s == "" {
-		return 0, nil
-	}
-	n, err := strconv.Atoi(s)
-	if err != nil {
-		return 0, fmt.Errorf("%s is a whole number, and %q was given", k, s)
-	}
-	return n, nil
-}
-
-// pathsArg is the paths given, one per line — or, from a caller that sends a list, the list.
-func pathsArg(a map[string]any) []string {
-	var raw []string
-	switch v := a["paths"].(type) {
-	case string:
-		raw = strings.Split(v, "\n")
-	case []any:
-		for _, p := range v {
-			if s, ok := p.(string); ok {
-				raw = append(raw, s)
-			}
-		}
-	}
-	var out []string
-	for _, p := range raw {
-		if p = strings.TrimSpace(p); p != "" {
-			out = append(out, p)
-		}
-	}
-	return out
-}
-
-// bounded is the last bound (novox/hq ADR 0310): whatever a verb made, no answer is larger than MaxAnswer.
-func bounded(answer any, err error) (any, error) {
-	if err != nil {
-		return nil, err
-	}
-	body, err := json.Marshal(answer)
-	if err != nil {
-		return nil, err
-	}
-	if len(body) > MaxAnswer {
-		return nil, fmt.Errorf("the answer is %d bytes, and an answer of node-reads is at most %d: ask for less", len(body), MaxAnswer)
-	}
-	return answer, nil
-}
-
-// verb is one of the seat's verbs: listed as `<seat>.<verb>`, so the runtime serves it on the seat's subject.
-// The descriptions are the controller's (internal/catalogue/reads.go), said again here for a caller of the
-// module's own address.
-func verb(name, description string, input map[string]any, run func(a map[string]any) (any, error)) stdio.Tool {
-	return stdio.Tool{Name: Seat + "." + name, Description: description, Input: input,
-		Run: func(a map[string]any) (any, error) { return bounded(run(a)) }}
-}
-
-func object(props map[string]any, required ...string) map[string]any {
-	if required == nil {
-		required = []string{}
-	}
-	return map[string]any{"type": "object", "properties": props, "required": required}
-}
-
-func tools(r Reader) []stdio.Tool {
-	return []stdio.Tool{
-		verb("stat", "Each component of one path or several, from / down: its type, owner and group (name and "+
-			"number), mode, whether it is a link and to what, and whether it is a mount point and of which file "+
-			"system. A link is not followed unless follow is \"true\". Read as the account mesh-reads, which holds no "+
-			"secret: a component it may not reach says so. At most 200 paths in one call.",
-			object(map[string]any{"paths": str("one absolute path, or several separated by line breaks"),
-				"follow": str("\"true\": also say where the path leads once every link is followed")}, "paths"),
-			func(a map[string]any) (any, error) { return r.Stat(pathsArg(a), arg(a, "follow") == "true") }),
-		verb("readlink", "What one link points to, as written, and where the path leads once every link is "+
-			"followed, and whether that exists.",
-			object(map[string]any{"path": str("an absolute path")}, "path"),
-			func(a map[string]any) (any, error) { return r.Readlink(arg(a, "path")) }),
-		verb("list", "Every entry of one directory with its type, owner, group, mode, size and, for a link, its "+
-			"target. At most 2000 entries; a longer directory is cut and says so. A place a secret is kept is "+
-			"refused by name.",
-			object(map[string]any{"path": str("an absolute path to a directory")}, "path"),
-			func(a map[string]any) (any, error) { return r.List(arg(a, "path")) }),
-		verb("read", "One text file, or a part of it by line: at most 256 KiB in one answer (64 KiB unless more "+
-			"is asked), cut at a line and said so. A negative from counts from the end, as tail does. A binary file "+
-			"is refused; a place a secret is kept, or a known credential file, is refused by name; a line shaped "+
-			"like a secret is withheld and its number said. /proc and /sys are read as far as mesh-reads may.",
-			object(map[string]any{"path": str("an absolute path to a file"),
-				"from":  str("the first line to answer, counted from 1; negative: that many lines from the end (optional)"),
-				"lines": str("how many lines to answer (optional)"),
-				"bytes": str("the most bytes to answer, up to 262144 (optional, 65536 unless given)")}, "path"),
-			func(a map[string]any) (any, error) {
-				var ask ReadAsk
-				var err error
-				if ask.From, err = number(a, "from"); err != nil {
-					return nil, err
-				}
-				if ask.Lines, err = number(a, "lines"); err != nil {
-					return nil, err
-				}
-				if ask.Bytes, err = number(a, "bytes"); err != nil {
-					return nil, err
-				}
-				return r.Read(arg(a, "path"), ask)
-			}),
-		verb("search", "Find a fixed string (never a pattern) in one file or under one directory: every matching "+
-			"line with its file and number. Bounded: at most 500 matches (100 unless more is asked), 8 directories "+
-			"deep (4 unless more is asked), 5000 files, 4 MiB per file and 20 seconds; links are not followed and "+
-			"binary files are skipped. A place a secret is kept is skipped and named; a matching line shaped like "+
-			"a secret is withheld. The answer says which bound it met.",
-			object(map[string]any{"text": str("the fixed string to find"),
-				"path":    str("an absolute path to a file or a directory"),
-				"depth":   str("how many directories deep, up to 8 (optional)"),
-				"matches": str("the most matches to answer, up to 500 (optional)"),
-				"case":    str("\"false\": match whatever the case (optional)")}, "text", "path"),
-			func(a map[string]any) (any, error) {
-				text, _ := a["text"].(string) // as given: a space at either end is part of what is found
-				ask := SearchAsk{Text: text, Path: arg(a, "path"), CaseInsensitive: arg(a, "case") == "false"}
-				var err error
-				if ask.Depth, err = number(a, "depth"); err != nil {
-					return nil, err
-				}
-				if ask.Matches, err = number(a, "matches"); err != nil {
-					return nil, err
-				}
-				return r.Search(ask)
-			}),
-		verb("account", "One account or group by name or number, as this node's account files say: an account's "+
-			"number, group, home, shell and every group it is in; a group's number and members. With neither, every "+
-			"account and group. Never a password field.",
-			object(map[string]any{"name": str("an account's name or number (optional)"),
-				"group": str("a group's name or number (optional)")}),
-			func(a map[string]any) (any, error) { return r.Account(arg(a, "name"), arg(a, "group")) }),
-	}
-}

modules/mesh-reads/cmd/mesh-reads/manifest_test.go

@@ -1,59 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"os"
-	"strings"
-	"testing"
-)
-
-// ADR 0310 §3: the account the reads run as is the module's own, made by the mesh, with no login shell, no
-// home of the operator's and no group beside its own, and the module runs as it.
-func TestTheAccountHoldsNoSecretsGroupAndNoLogin(t *testing.T) {
-	raw, err := os.ReadFile("../../module.json")
-	if err != nil {
-		t.Fatal(err)
-	}
-	var m struct {
-		RunsAs       string           `json:"runs-as"`
-		SecretsOwner string           `json:"secrets-owner"`
-		Claims       []map[string]any `json:"claims"`
-		Resources    []map[string]any `json:"resources"`
-	}
-	if err := json.Unmarshal(raw, &m); err != nil {
-		t.Fatal(err)
-	}
-	if m.RunsAs != "mesh-reads" || m.SecretsOwner != "mesh-reads" {
-		t.Errorf("runs as %q, secrets owned by %q", m.RunsAs, m.SecretsOwner)
-	}
-	if len(m.Claims) != 1 || m.Claims[0]["name"] != Seat {
-		t.Errorf("claims %v", m.Claims)
-	}
-	found := false
-	for _, r := range m.Resources {
-		if r["type"] != "user" {
-			continue
-		}
-		found = true
-		if r["name"] != m.RunsAs {
-			t.Errorf("a user other than its own: %v", r)
-		}
-		if r["shell"] != "/usr/bin/nologin" {
-			t.Errorf("the account has a login shell: %v", r["shell"])
-		}
-		if home, _ := r["home"].(string); !strings.HasPrefix(home, "/var/lib/") {
-			t.Errorf("the account's home is %q, not one of the mesh's", home)
-		}
-		if _, grouped := r["groups"]; grouped {
-			t.Errorf("the account is put in groups: %v", r["groups"])
-		}
-	}
-	if !found {
-		t.Error("the module makes no account of its own")
-	}
-	for _, r := range m.Resources {
-		if r["type"] != "user" && r["type"] != "directory" {
-			t.Errorf("a read-only holder declares a %v: %v", r["type"], r)
-		}
-	}
-}

modules/mesh-reads/cmd/mesh-reads/reads.go

@@ -1,926 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"io/fs"
-	"os"
-	"path/filepath"
-	"sort"
-	"strconv"
-	"strings"
-	"syscall"
-	"time"
-)
-
-// The bounds (novox/hq ADR 0310, Consequences: set by the build and stated in each verb's description). Every
-// answer stays under MaxAnswer, which the tools check once more after an answer is made.
-const (
-	MaxAnswer       = 1 << 20   // no answer of this module is larger, whatever the bounds below allow
-	MaxPaths        = 200       // paths one stat answers
-	MaxComponents   = 64        // components of one path
-	MaxEntries      = 2000      // entries one list answers
-	DefaultReadSize = 64 << 10  // bytes a read answers unless more is asked
-	MaxReadSize     = 256 << 10 // bytes a read answers at most
-	MaxScan         = 64 << 20  // bytes a read passes over to reach the lines asked
-	DefaultMatches  = 100
-	MaxMatches      = 500
-	DefaultDepth    = 4
-	MaxDepth        = 8
-	MaxFiles        = 5000    // files one search opens
-	MaxFileScan     = 4 << 20 // bytes one search reads of one file
-	MaxLine         = 300     // characters of one matching line answered
-	SearchTime      = 20 * time.Second
-	MaxAccounts     = 2000
-)
-
-// Reader reads one node's files and accounts as the account it runs as.
-type Reader struct {
-	Refuser
-	// Passwd, Group and MountInfo are the files accounts, groups and mount points are read from.
-	Passwd, Group, MountInfo string
-	// Euid is the account this runs as; never root (ADR 0310 §3).
-	Euid func() int
-	// Now is the clock a search is bounded by.
-	Now func() time.Time
-}
-
-func newReader(places []string) Reader {
-	return Reader{Refuser: Refuser{Places: places}, Passwd: "/etc/passwd", Group: "/etc/group",
-		MountInfo: "/proc/self/mountinfo", Euid: os.Geteuid, Now: time.Now}
-}
-
-// asItsOwn refuses every read when this runs as root: what it may see is bounded by its account's file
-// modes, and root's are none (novox/hq ADR 0310 §3). Loud, never a silent widening.
-func (r Reader) asItsOwn() error {
-	if r.Euid() == 0 {
-		return errors.New("mesh-reads runs as root here, and its reads are bounded by an account of its own that " +
-			"holds no secret (novox/hq ADR 0310 §3): it answers nothing until it runs as mesh-reads")
-	}
-	return nil
-}
-
-func absolute(path string) (string, error) {
-	path = strings.TrimSpace(path)
-	if !strings.HasPrefix(path, "/") {
-		return "", fmt.Errorf("%q is not an absolute path: name it from /", path)
-	}
-	return filepath.Clean(path), nil
-}
-
-// why turns a file error into the words an answer says: what stopped the read, never a Go error's text.
-func why(err error) string {
-	switch {
-	case errors.Is(err, fs.ErrNotExist):
-		return "it does not exist"
-	case errors.Is(err, fs.ErrPermission):
-		return "the account mesh-reads may not reach it (its file modes refuse it)"
-	case errors.Is(err, syscall.ELOOP):
-		return "its links loop"
-	case errors.Is(err, syscall.ENOTDIR):
-		return "a component of it is not a directory"
-	}
-	var pe *fs.PathError
-	if errors.As(err, &pe) {
-		return pe.Err.Error()
-	}
-	return err.Error()
-}
-
-// ---- stat ----
-
-// Component is one component of a path as lstat sees it.
-type Component struct {
-	Path     string `json:"path"`
-	Type     string `json:"type,omitempty"`
-	Owner    string `json:"owner,omitempty"`
-	UID      *int   `json:"uid,omitempty"`
-	Group    string `json:"group,omitempty"`
-	GID      *int   `json:"gid,omitempty"`
-	Mode     string `json:"mode,omitempty"`  // octal, with the setuid, setgid and sticky bits
-	Perms    string `json:"perms,omitempty"` // as ls shows them
-	Size     *int64 `json:"size,omitempty"`
-	Link     string `json:"link,omitempty"` // what a link points to, as written
-	Mount    *Mount `json:"mount,omitempty"`
-	Secret   string `json:"secret-place,omitempty"` // why a read under it is refused
-	Unreachd string `json:"unreachable,omitempty"`
-}
-
-// Mount is a mount point: its file system and source.
-type Mount struct {
-	FS     string `json:"fs"`
-	Source string `json:"source"`
-}
-
-// PathStat is one path's components, from / down, and where it leads once every link is followed.
-type PathStat struct {
-	Path       string      `json:"path"`
-	Components []Component `json:"components"`
-	LeadsTo    string      `json:"leads-to,omitempty"`
-	Leads      *Component  `json:"there,omitempty"`
-	Stopped    string      `json:"stopped,omitempty"`
-}
-
-// StatAnswer is what stat answers.
-type StatAnswer struct {
-	Paths    []PathStat `json:"paths"`
-	Withheld []Withheld `json:"withheld,omitempty"`
-}
-
-func (r Reader) Stat(paths []string, follow bool) (StatAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return StatAnswer{}, err
-	}
-	if len(paths) == 0 {
-		return StatAnswer{}, errors.New("name a path to stat")
-	}
-	if len(paths) > MaxPaths {
-		return StatAnswer{}, fmt.Errorf("%d paths asked, and one stat answers at most %d: ask in parts", len(paths), MaxPaths)
-	}
-	names := r.names()
-	mounts := r.mounts()
-	var out StatAnswer
-	for _, raw := range paths {
-		path, err := absolute(raw)
-		if err != nil {
-			return StatAnswer{}, err
-		}
-		ps := PathStat{Path: path}
-		walk := []string{"/"}
-		acc := ""
-		for _, part := range strings.Split(strings.TrimPrefix(path, "/"), "/") {
-			if part == "" {
-				continue
-			}
-			acc += "/" + part
-			walk = append(walk, acc)
-		}
-		if len(walk) > MaxComponents {
-			return StatAnswer{}, fmt.Errorf("%s has %d components, and a stat answers at most %d", path, len(walk), MaxComponents)
-		}
-		for _, p := range walk {
-			c := r.component(p, names, mounts)
-			ps.Components = append(ps.Components, c)
-			if c.Unreachd != "" {
-				ps.Stopped = c.Path + ": " + c.Unreachd
-				break
-			}
-		}
-		if follow && ps.Stopped == "" {
-			if leads, err := filepath.EvalSymlinks(path); err != nil {
-				ps.Stopped = "following its links: " + why(err)
-			} else {
-				ps.LeadsTo = leads
-				if leads != path {
-					c := r.component(leads, names, mounts)
-					ps.Leads = &c
-				}
-			}
-		}
-		out.Paths = append(out.Paths, ps)
-	}
-	out.Withheld = cleanStat(&out)
-	return out, nil
-}
-
-func (r Reader) component(p string, names accounts, mounts map[string]Mount) Component {
-	c := Component{Path: p}
-	info, err := os.Lstat(p)
-	if err != nil {
-		c.Unreachd = why(err)
-		return c
-	}
-	c.Type = typeOf(info.Mode())
-	c.Perms = info.Mode().String()
-	if st, ok := info.Sys().(*syscall.Stat_t); ok {
-		uid, gid := int(st.Uid), int(st.Gid)
-		c.UID, c.GID = &uid, &gid
-		c.Owner, c.Group = names.user(uid), names.group(gid)
-		c.Mode = fmt.Sprintf("%04o", st.Mode&07777)
-	}
-	if info.Mode().IsRegular() {
-		size := info.Size()
-		c.Size = &size
-	}
-	if info.Mode()&fs.ModeSymlink != 0 {
-		if target, err := os.Readlink(p); err == nil {
-			c.Link = target
-		}
-	}
-	if m, ok := mounts[p]; ok {
-		c.Mount = &m
-	}
-	if why := r.Refused(p); why != "" {
-		c.Secret = why
-	}
-	return c
-}
-
-func typeOf(m fs.FileMode) string {
-	switch {
-	case m.IsDir():
-		return "directory"
-	case m&fs.ModeSymlink != 0:
-		return "link"
-	case m.IsRegular():
-		return "file"
-	case m&fs.ModeNamedPipe != 0:
-		return "fifo"
-	case m&fs.ModeSocket != 0:
-		return "socket"
-	case m&fs.ModeCharDevice != 0:
-		return "character device"
-	case m&fs.ModeDevice != 0:
-		return "block device"
-	}
-	return "other"
-}
-
-func cleanStat(a *StatAnswer) []Withheld {
-	var w []Withheld
-	cleanC := func(c *Component) {
-		for _, f := range []*string{&c.Link} {
-			if s, what := clean(*f); what != "" {
-				w = append(w, Withheld{At: "a link's target", Class: what})
-				*f = s
-			}
-		}
-		if c.Mount != nil {
-			if s, what := clean(c.Mount.Source); what != "" {
-				w = append(w, Withheld{At: "a mount's source", Class: what})
-				c.Mount.Source = s
-			}
-		}
-	}
-	for i := range a.Paths {
-		p := &a.Paths[i]
-		for j := range p.Components {
-			cleanC(&p.Components[j])
-		}
-		if p.Leads != nil {
-			cleanC(p.Leads)
-		}
-	}
-	return w
-}
-
-// ---- readlink ----
-
-// LinkAnswer is what readlink answers.
-type LinkAnswer struct {
-	Path     string     `json:"path"`
-	Link     string     `json:"link,omitempty"` // as written; empty when the path is not a link
-	IsLink   bool       `json:"is-link"`
-	LeadsTo  string     `json:"leads-to,omitempty"`
-	Exists   bool       `json:"exists"`
-	Stopped  string     `json:"stopped,omitempty"`
-	Withheld []Withheld `json:"withheld,omitempty"`
-}
-
-func (r Reader) Readlink(raw string) (LinkAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return LinkAnswer{}, err
-	}
-	path, err := absolute(raw)
-	if err != nil {
-		return LinkAnswer{}, err
-	}
-	a := LinkAnswer{Path: path}
-	info, err := os.Lstat(path)
-	if err != nil {
-		a.Stopped = why(err)
-		return a, nil
-	}
-	if info.Mode()&fs.ModeSymlink != 0 {
-		a.IsLink = true
-		if a.Link, err = os.Readlink(path); err != nil {
-			a.Stopped = why(err)
-		}
-	}
-	if leads, err := filepath.EvalSymlinks(path); err == nil {
-		a.LeadsTo, a.Exists = leads, true
-	} else if a.Stopped == "" {
-		a.Stopped = "following its links: " + why(err)
-	}
-	for _, f := range []*string{&a.Link} {
-		if s, what := clean(*f); what != "" {
-			a.Withheld = append(a.Withheld, Withheld{At: "a link's target", Class: what})
-			*f = s
-		}
-	}
-	return a, nil
-}
-
-// ---- list ----
-
-// Entry is one entry of a directory.
-type Entry struct {
-	Name  string `json:"name"`
-	Type  string `json:"type"`
-	Owner string `json:"owner,omitempty"`
-	Group string `json:"group,omitempty"`
-	Mode  string `json:"mode,omitempty"`
-	Size  *int64 `json:"size,omitempty"`
-	Link  string `json:"link,omitempty"`
-}
-
-// ListAnswer is what list answers.
-type ListAnswer struct {
-	Path     string     `json:"path"`
-	Entries  []Entry    `json:"entries"`
-	Count    int        `json:"count"`
-	Cut      string     `json:"cut,omitempty"`
-	Withheld []Withheld `json:"withheld,omitempty"`
-}
-
-// refusedRead is a refusal by name, before any read: the path asked and where it leads are both judged, so a
-// link to a secret place is refused as the place is.
-func (r Reader) refusedRead(path string) error {
-	if why := r.Refused(path); why != "" {
-		return fmt.Errorf("%s is refused by name: %s (novox/hq ADR 0310 §5)", path, why)
-	}
-	if leads, err := filepath.EvalSymlinks(path); err == nil && leads != path {
-		if why := r.Refused(leads); why != "" {
-			return fmt.Errorf("%s leads to %s, which is refused by name: %s (novox/hq ADR 0310 §5)", path, leads, why)
-		}
-	}
-	return nil
-}
-
-func (r Reader) List(raw string) (ListAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return ListAnswer{}, err
-	}
-	path, err := absolute(raw)
-	if err != nil {
-		return ListAnswer{}, err
-	}
-	if err := r.refusedRead(path); err != nil {
-		return ListAnswer{}, err
-	}
-	entries, err := os.ReadDir(path)
-	if err != nil {
-		return ListAnswer{}, fmt.Errorf("%s cannot be listed: %s", path, why(err))
-	}
-	names := r.names()
-	a := ListAnswer{Path: path, Count: len(entries), Entries: []Entry{}}
-	if len(entries) > MaxEntries {
-		a.Cut = fmt.Sprintf("cut at %d of %d entries (the bound of one list), in name order", MaxEntries, len(entries))
-		entries = entries[:MaxEntries]
-	}
-	for _, e := range entries {
-		en := Entry{Name: e.Name(), Type: typeOf(e.Type())}
-		if info, err := e.Info(); err == nil {
-			en.Type = typeOf(info.Mode())
-			if st, ok := info.Sys().(*syscall.Stat_t); ok {
-				en.Owner, en.Group = names.user(int(st.Uid)), names.group(int(st.Gid))
-				en.Mode = fmt.Sprintf("%04o", st.Mode&07777)
-			}
-			if info.Mode().IsRegular() {
-				size := info.Size()
-				en.Size = &size
-			}
-			if info.Mode()&fs.ModeSymlink != 0 {
-				en.Link, _ = os.Readlink(filepath.Join(path, e.Name()))
-			}
-		}
-		for _, f := range []*string{&en.Link} {
-			if s, what := clean(*f); what != "" {
-				a.Withheld = append(a.Withheld, Withheld{At: "a link's target", Class: what})
-				*f = s
-			}
-		}
-		a.Entries = append(a.Entries, en)
-	}
-	return a, nil
-}
-
-// ---- read ----
-
-// ReadAnswer is what read answers.
-type ReadAnswer struct {
-	Path     string `json:"path"`
-	Size     int64  `json:"size"` // as the file says; 0 for most of /proc and /sys
-	From     int    `json:"from"` // the first line answered, counted from 1
-	Lines    int    `json:"lines"`
-	Text     string `json:"text"`
-	Cut      string `json:"cut,omitempty"`
-	Withheld []int  `json:"withheld-lines,omitempty"`
-	Why      string `json:"withheld-because,omitempty"`
-}
-
-// ReadAsk is what a read asks: the lines from From (1 is the first; a negative From counts from the end, as
-// tail does), at most Lines of them (0: as many as fit), and at most Bytes bytes.
-type ReadAsk struct {
-	From, Lines, Bytes int
-}
-
-func (r Reader) Read(raw string, ask ReadAsk) (ReadAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return ReadAnswer{}, err
-	}
-	path, err := absolute(raw)
-	if err != nil {
-		return ReadAnswer{}, err
-	}
-	if err := r.refusedRead(path); err != nil {
-		return ReadAnswer{}, err
-	}
-	bound := ask.Bytes
-	switch {
-	case bound <= 0:
-		bound = DefaultReadSize
-	case bound > MaxReadSize:
-		return ReadAnswer{}, fmt.Errorf("%d bytes asked, and one read answers at most %d", bound, MaxReadSize)
-	}
-	if ask.Lines < 0 {
-		return ReadAnswer{}, errors.New("lines is a count: name how many, or none for as many as fit")
-	}
-	// Non-blocking, so a fifo answers rather than waits; and judged by what was opened, not by its name.
-	f, err := os.OpenFile(path, os.O_RDONLY|syscall.O_NONBLOCK, 0)
-	if err != nil {
-		return ReadAnswer{}, fmt.Errorf("%s cannot be read: %s", path, why(err))
-	}
-	defer f.Close()
-	info, err := f.Stat()
-	if err != nil {
-		return ReadAnswer{}, fmt.Errorf("%s cannot be read: %s", path, why(err))
-	}
-	if !info.Mode().IsRegular() {
-		return ReadAnswer{}, fmt.Errorf("%s is a %s, not a file: list a directory, stat anything else", path, typeOf(info.Mode()))
-	}
-	a := ReadAnswer{Path: path, Size: info.Size()}
-	lines, cut, err := pick(io.LimitReader(f, MaxScan), ask, bound)
-	if err != nil {
-		return ReadAnswer{}, fmt.Errorf("%s: %v", path, err)
-	}
-	a.Cut = cut
-	if len(lines) > 0 {
-		a.From = lines[0].n
-	}
-	var text strings.Builder
-	for _, l := range lines {
-		s, what := clean(l.text)
-		if what != "" {
-			a.Withheld = append(a.Withheld, l.n)
-			a.Why = "a line shaped like a secret is withheld by the content rule (novox/hq ADR 0310 §4)"
-		}
-		text.WriteString(s)
-		if l.newline {
-			text.WriteByte('\n')
-		}
-	}
-	a.Text, a.Lines = text.String(), len(lines)
-	return a, nil
-}
-
-type line struct {
-	n       int
-	text    string
-	newline bool
-	size    int
-}
-
-// pick reads lines and keeps the ones asked, within bound bytes. A NUL byte is a binary file, refused.
-func pick(in io.Reader, ask ReadAsk, bound int) ([]line, string, error) {
-	br := bufio.NewReaderSize(in, 64<<10)
-	var kept []line
-	size, n := 0, 0
-	from := ask.From
-	if from == 0 {
-		from = 1
-	}
-	for {
-		raw, err := br.ReadString('\n')
-		if raw == "" && err != nil {
-			if err == io.EOF {
-				break
-			}
-			return nil, "", err
-		}
-		n++
-		if strings.IndexByte(raw, 0) >= 0 {
-			return nil, "", errors.New("it is a binary file, and read answers text")
-		}
-		l := line{n: n, text: strings.TrimSuffix(raw, "\n"), newline: strings.HasSuffix(raw, "\n"), size: len(raw)}
-		if from > 0 {
-			if n < from {
-				continue
-			}
-			if ask.Lines > 0 && len(kept) == ask.Lines {
-				break
-			}
-			if size+len(raw) > bound {
-				return kept, fmt.Sprintf("cut at line %d: the answer holds at most %d bytes", n, bound), nil
-			}
-			kept = append(kept, l)
-			size += len(raw)
-		} else {
-			// From the end, as tail does: the last -from lines, kept as they pass.
-			kept = append(kept, l)
-			size += len(raw)
-			for len(kept) > -from || size > bound {
-				size -= kept[0].size
-				kept = kept[1:]
-			}
-		}
-		if err == io.EOF {
-			break
-		}
-	}
-	if from > 0 && n < from && n > 0 {
-		return nil, "", fmt.Errorf("it has %d lines, and line %d was asked", n, from)
-	}
-	if from < 0 && ask.Lines > 0 && len(kept) > ask.Lines {
-		kept = kept[:ask.Lines]
-	}
-	return kept, "", nil
-}
-
-// ---- search ----
-
-// Match is one matching line.
-type Match struct {
-	File string `json:"file"`
-	Line int    `json:"line"`
-	Text string `json:"text"`
-}
-
-// SearchAnswer is what search answers.
-type SearchAnswer struct {
-	Text       string     `json:"text"`
-	Path       string     `json:"path"`
-	Matches    []Match    `json:"matches"`
-	Files      int        `json:"files-read"`
-	Bound      string     `json:"bound-met,omitempty"`
-	Skipped    []string   `json:"refused-by-name,omitempty"`
-	Unreadable int        `json:"unreadable,omitempty"`
-	Binary     int        `json:"binary-skipped,omitempty"`
-	Withheld   []Withheld `json:"withheld,omitempty"`
-}
-
-// SearchAsk is what a search asks.
-type SearchAsk struct {
-	Text, Path      string
-	Depth, Matches  int
-	CaseInsensitive bool
-}
-
-var errBound = errors.New("bound met")
-
-func (r Reader) Search(ask SearchAsk) (SearchAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return SearchAnswer{}, err
-	}
-	if ask.Text == "" {
-		return SearchAnswer{}, errors.New("name the text to find")
-	}
-	if strings.ContainsAny(ask.Text, "\n\x00") {
-		return SearchAnswer{}, errors.New("the text is found within one line: it may not hold a line break")
-	}
-	root, err := absolute(ask.Path)
-	if err != nil {
-		return SearchAnswer{}, err
-	}
-	if err := r.refusedRead(root); err != nil {
-		return SearchAnswer{}, err
-	}
-	depth, matches := ask.Depth, ask.Matches
-	switch {
-	case depth == 0:
-		depth = DefaultDepth
-	case depth < 0 || depth > MaxDepth:
-		return SearchAnswer{}, fmt.Errorf("depth %d asked; a search goes at most %d directories deep", depth, MaxDepth)
-	}
-	switch {
-	case matches == 0:
-		matches = DefaultMatches
-	case matches < 0 || matches > MaxMatches:
-		return SearchAnswer{}, fmt.Errorf("%d matches asked; a search answers at most %d", matches, MaxMatches)
-	}
-	needle := ask.Text
-	if ask.CaseInsensitive {
-		needle = strings.ToLower(needle)
-	}
-	a := SearchAnswer{Text: ask.Text, Path: root, Matches: []Match{}}
-	deadline := r.Now().Add(SearchTime)
-	base := strings.Count(root, "/")
-	if root == "/" {
-		base = 0
-	}
-	err = filepath.WalkDir(root, func(p string, d fs.DirEntry, err error) error {
-		if r.Now().After(deadline) {
-			a.Bound = fmt.Sprintf("time: a search runs at most %s", SearchTime)
-			return errBound
-		}
-		if err != nil {
-			a.Unreadable++
-			if d != nil && d.IsDir() {
-				return fs.SkipDir
-			}
-			return nil
-		}
-		if p != root {
-			if why := r.Refused(p); why != "" {
-				a.Skipped = append(a.Skipped, p)
-				if d.IsDir() {
-					return fs.SkipDir
-				}
-				return nil
-			}
-		}
-		if d.IsDir() {
-			if p != root && strings.Count(p, "/")-base > depth {
-				return fs.SkipDir
-			}
-			return nil
-		}
-		if !d.Type().IsRegular() {
-			return nil // links are not followed; a device, a fifo or a socket is not text
-		}
-		if a.Files >= MaxFiles {
-			a.Bound = fmt.Sprintf("files: a search reads at most %d files", MaxFiles)
-			return errBound
-		}
-		a.Files++
-		return r.searchFile(p, needle, ask.CaseInsensitive, matches, &a)
-	})
-	if err != nil && !errors.Is(err, errBound) {
-		return SearchAnswer{}, fmt.Errorf("%s cannot be searched: %s", root, why(err))
-	}
-	return a, nil
-}
-
-func (r Reader) searchFile(p, needle string, fold bool, bound int, a *SearchAnswer) error {
-	f, err := os.OpenFile(p, os.O_RDONLY|syscall.O_NONBLOCK, 0)
-	if err != nil {
-		a.Unreadable++
-		return nil
-	}
-	defer f.Close()
-	br := bufio.NewReaderSize(io.LimitReader(f, MaxFileScan), 64<<10)
-	if head, _ := br.Peek(8 << 10); bytes.IndexByte(head, 0) >= 0 {
-		a.Binary++
-		return nil
-	}
-	n := 0
-	for {
-		raw, err := br.ReadString('\n')
-		if raw == "" && err != nil {
-			return nil
-		}
-		n++
-		hay := raw
-		if fold {
-			hay = strings.ToLower(hay)
-		}
-		if strings.Contains(hay, needle) {
-			if len(a.Matches) >= bound {
-				a.Bound = fmt.Sprintf("matches: %d answered, as asked or the default", bound)
-				return errBound
-			}
-			text := strings.TrimRight(raw, "\r\n")
-			if r := []rune(text); len(r) > MaxLine {
-				text = string(r[:MaxLine]) + "…"
-			}
-			file := p
-			for _, f := range []*string{&text} {
-				if s, what := clean(*f); what != "" {
-					a.Withheld = append(a.Withheld, Withheld{At: "a matching line", Class: what})
-					*f = s
-				}
-			}
-			a.Matches = append(a.Matches, Match{File: file, Line: n, Text: text})
-		}
-		if err != nil {
-			return nil
-		}
-	}
-}
-
-// ---- accounts ----
-
-// Account is one account as the account file says it, never its password field.
-type Account struct {
-	Name   string   `json:"name"`
-	UID    int      `json:"uid"`
-	GID    int      `json:"gid"`
-	Group  string   `json:"group,omitempty"`
-	Gecos  string   `json:"gecos,omitempty"`
-	Home   string   `json:"home"`
-	Shell  string   `json:"shell"`
-	Groups []string `json:"groups,omitempty"`
-}
-
-// GroupEntry is one group.
-type GroupEntry struct {
-	Name    string   `json:"name"`
-	GID     int      `json:"gid"`
-	Members []string `json:"members"`
-}
-
-// AccountAnswer is what account answers.
-type AccountAnswer struct {
-	Accounts []Account    `json:"accounts,omitempty"`
-	Groups   []GroupEntry `json:"groups,omitempty"`
-	Source   string       `json:"source"`
-	Cut      string       `json:"cut,omitempty"`
-	Withheld []Withheld   `json:"withheld,omitempty"`
-}
-
-type accounts struct {
-	users  []Account
-	groups []GroupEntry
-}
-
-func (a accounts) user(uid int) string {
-	for _, u := range a.users {
-		if u.UID == uid {
-			return u.Name
-		}
-	}
-	return ""
-}
-
-func (a accounts) group(gid int) string {
-	for _, g := range a.groups {
-		if g.GID == gid {
-			return g.Name
-		}
-	}
-	return ""
-}
-
-// names reads the account files; a file it cannot read gives no names, and a component says only numbers.
-func (r Reader) names() accounts {
-	var a accounts
-	if raw, err := os.ReadFile(r.Passwd); err == nil {
-		for _, l := range strings.Split(string(raw), "\n") {
-			f := strings.Split(l, ":")
-			if len(f) < 7 || strings.HasPrefix(l, "#") {
-				continue
-			}
-			uid, e1 := strconv.Atoi(f[2])
-			gid, e2 := strconv.Atoi(f[3])
-			if e1 != nil || e2 != nil {
-				continue
-			}
-			a.users = append(a.users, Account{Name: f[0], UID: uid, GID: gid, Gecos: f[4], Home: f[5], Shell: f[6]})
-		}
-	}
-	if raw, err := os.ReadFile(r.Group); err == nil {
-		for _, l := range strings.Split(string(raw), "\n") {
-			f := strings.Split(l, ":")
-			if len(f) < 4 || strings.HasPrefix(l, "#") {
-				continue
-			}
-			gid, err := strconv.Atoi(f[2])
-			if err != nil {
-				continue
-			}
-			members := []string{}
-			for _, m := range strings.Split(f[3], ",") {
-				if m = strings.TrimSpace(m); m != "" {
-					members = append(members, m)
-				}
-			}
-			a.groups = append(a.groups, GroupEntry{Name: f[0], GID: gid, Members: members})
-		}
-	}
-	return a
-}
-
-func (r Reader) Account(name, group string) (AccountAnswer, error) {
-	if err := r.asItsOwn(); err != nil {
-		return AccountAnswer{}, err
-	}
-	all := r.names()
-	if len(all.users) == 0 {
-		return AccountAnswer{}, fmt.Errorf("%s gave no account: it is unreadable or empty", r.Passwd)
-	}
-	out := AccountAnswer{Source: r.Passwd + ", " + r.Group + " (an account kept elsewhere, such as a directory " +
-		"service or systemd's dynamic accounts, is not here)"}
-	complete := func(u Account) Account {
-		u.Group = all.group(u.GID)
-		for _, g := range all.groups {
-			if g.GID == u.GID {
-				u.Groups = append(u.Groups, g.Name)
-				continue
-			}
-			for _, m := range g.Members {
-				if m == u.Name {
-					u.Groups = append(u.Groups, g.Name)
-				}
-			}
-		}
-		return u
-	}
-	name, group = strings.TrimSpace(name), strings.TrimSpace(group)
-	switch {
-	case name != "":
-		for _, u := range all.users {
-			if u.Name == name || strconv.Itoa(u.UID) == name {
-				out.Accounts = append(out.Accounts, complete(u))
-			}
-		}
-		if len(out.Accounts) == 0 {
-			return AccountAnswer{}, fmt.Errorf("no account %q on this node", name)
-		}
-	case group != "":
-		for _, g := range all.groups {
-			if g.Name == group || strconv.Itoa(g.GID) == group {
-				// Its members as getent says them, and every account whose own group it is.
-				for _, u := range all.users {
-					if u.GID == g.GID && !contains(g.Members, u.Name) {
-						g.Members = append(g.Members, u.Name)
-					}
-				}
-				out.Groups = append(out.Groups, g)
-			}
-		}
-		if len(out.Groups) == 0 {
-			return AccountAnswer{}, fmt.Errorf("no group %q on this node", group)
-		}
-	default:
-		for _, u := range all.users {
-			out.Accounts = append(out.Accounts, complete(u))
-		}
-		out.Groups = all.groups
-		if len(out.Accounts) > MaxAccounts {
-			out.Cut = fmt.Sprintf("cut at %d of %d accounts", MaxAccounts, len(out.Accounts))
-			out.Accounts = out.Accounts[:MaxAccounts]
-		}
-		if len(out.Groups) > MaxAccounts {
-			out.Cut = strings.TrimPrefix(out.Cut+"; ", "; ") + fmt.Sprintf("cut at %d of %d groups", MaxAccounts, len(out.Groups))
-			out.Groups = out.Groups[:MaxAccounts]
-		}
-	}
-	for i := range out.Accounts {
-		u := &out.Accounts[i]
-		for _, f := range []*string{&u.Gecos, &u.Home, &u.Shell} {
-			if s, what := clean(*f); what != "" {
-				out.Withheld = append(out.Withheld, Withheld{At: "account " + u.Name, Class: what})
-				*f = s
-			}
-		}
-	}
-	sort.SliceStable(out.Accounts, func(i, j int) bool { return out.Accounts[i].UID < out.Accounts[j].UID })
-	return out, nil
-}
-
-func contains(list []string, s string) bool {
-	for _, x := range list {
-		if x == s {
-			return true
-		}
-	}
-	return false
-}
-
-// ---- mounts ----
-
-// mounts reads the mount points this process sees, by path. /proc/self/mountinfo is readable by every account.
-func (r Reader) mounts() map[string]Mount {
-	out := map[string]Mount{}
-	raw, err := os.ReadFile(r.MountInfo)
-	if err != nil {
-		return out
-	}
-	for _, l := range strings.Split(string(raw), "\n") {
-		f := strings.Fields(l)
-		dash := -1
-		for i, x := range f {
-			if x == "-" {
-				dash = i
-				break
-			}
-		}
-		if len(f) < 5 || dash < 0 || dash+2 >= len(f) {
-			continue
-		}
-		out[unescape(f[4])] = Mount{FS: f[dash+1], Source: unescape(f[dash+2])}
-	}
-	return out
-}
-
-// unescape reads mountinfo's octal escapes (\040 for a space).
-func unescape(s string) string {
-	if !strings.Contains(s, `\`) {
-		return s
-	}
-	var b strings.Builder
-	for i := 0; i < len(s); i++ {
-		if s[i] == '\\' && i+3 < len(s) {
-			if v, err := strconv.ParseUint(s[i+1:i+4], 8, 8); err == nil {
-				b.WriteByte(byte(v))
-				i += 3
-				continue
-			}
-		}
-		b.WriteByte(s[i])
-	}
-	return b.String()
-}

modules/mesh-reads/cmd/mesh-reads/reads_test.go

@@ -1,452 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"os"
-	"path/filepath"
-	"sort"
-	"strings"
-	"syscall"
-	"testing"
-	"time"
-)
-
-// A token shaped as a secret, written into files the tests read.
-const aToken = "ghp_abcdefghijklmnopqrstuvwxyz0123456789"
-
-func testReader(t *testing.T, places ...string) (Reader, string) {
-	t.Helper()
-	dir := t.TempDir()
-	passwd := filepath.Join(dir, "passwd")
-	group := filepath.Join(dir, "group")
-	mountinfo := filepath.Join(dir, "mountinfo")
-	write(t, passwd, "root:x:0:0::/root:/usr/bin/bash\nops:x:1000:1000:The Operator:/home/ops:/usr/bin/zsh\n"+
-		"mesh-reads:x:961:961::/var/lib/mesh-reads:/usr/bin/nologin\n")
-	write(t, group, "root:x:0:\nwheel:x:998:ops\nops:x:1000:\nmesh-reads:x:961:\ndocker:x:970:ops,builder\n")
-	data := filepath.Join(dir, "data")
-	write(t, mountinfo, "22 1 0:21 / / rw,relatime - btrfs /dev/nvme0n1p2 rw\n"+
-		"40 22 0:40 / "+strings.ReplaceAll(data, " ", `\040`)+" rw - nfs4 home-server:/tank/data rw\n")
-	r := Reader{Refuser: Refuser{Places: places}, Passwd: passwd, Group: group, MountInfo: mountinfo,
-		Euid: func() int { return 961 }, Now: time.Now}
-	return r, dir
-}
-
-func write(t *testing.T, path, content string) {
-	t.Helper()
-	if err := os.MkdirAll(filepath.Dir(path), 0o755); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.WriteFile(path, []byte(content), 0o644); err != nil {
-		t.Fatal(err)
-	}
-}
-
-// ADR 0310 §3: run as root, every read is refused, loudly — its bound is an account of its own.
-func TestEveryReadIsRefusedAsRoot(t *testing.T) {
-	r, dir := testReader(t)
-	r.Euid = func() int { return 0 }
-	write(t, filepath.Join(dir, "f"), "x\n")
-	if _, err := r.Read(filepath.Join(dir, "f"), ReadAsk{}); err == nil || !strings.Contains(err.Error(), "root") {
-		t.Errorf("a read as root: %v", err)
-	}
-	if _, err := r.Stat([]string{dir}, false); err == nil {
-		t.Error("a stat as root was answered")
-	}
-	if _, err := r.Account("ops", ""); err == nil {
-		t.Error("an account lookup as root was answered")
-	}
-}
-
-// ADR 0310 §5: without the controller's list of secret places it does not start: a refusal it promises would be
-// silent.
-func TestItDoesNotStartWithoutTheNodesSecretPlaces(t *testing.T) {
-	if _, err := placesFrom(""); err == nil || !strings.Contains(err.Error(), PlacesWord) {
-		t.Errorf("no places: %v", err)
-	}
-	if p, err := placesFrom(`["/var/lib/mesh-vault"]`); err != nil || len(p) != 1 {
-		t.Errorf("a list: %v %v", p, err)
-	}
-	if p, err := placesFrom(`[]`); err != nil || len(p) != 0 {
-		t.Errorf("an empty list is a node with no secret place: %v %v", p, err)
-	}
-}
-
-// ADR 0310 §5: a path under the vault's directory, a module's own-secret directory and a known credential file
-// are each refused by name before any read — though the account's modes would allow it — and a link to one is
-// refused as the place is.
-func TestSecretPlacesAreRefusedByNameBeforeAnyRead(t *testing.T) {
-	r0, dir := testReader(t)
-	vault := filepath.Join(dir, "var/lib/mesh-vault")
-	own := filepath.Join(dir, "var/lib/desk-channel")
-	r, _ := r0, dir
-	r.Places = []string{vault, own}
-	for _, p := range []string{
-		filepath.Join(vault, "ledger/entries.json"),
-		filepath.Join(own, "broker"),
-		filepath.Join(own, "settings.json"),
-		filepath.Join(dir, "home/ops/.claude/.credentials.json"),
-		filepath.Join(dir, "home/ops/.ssh/config"),
-		filepath.Join(dir, "home/ops/.pgpass"),
-		filepath.Join(dir, "etc/ssh/ssh_host_ed25519_key"),
-		filepath.Join(dir, "etc/shadow"),
-		filepath.Join(dir, "srv/tls/server.key"),
-	} {
-		write(t, p, "harmless words\n")
-		if _, err := r.Read(p, ReadAsk{}); err == nil || !strings.Contains(err.Error(), "refused by name") {
-			t.Errorf("%s was read: %v", p, err)
-		}
-	}
-	if _, err := r.List(vault); err == nil || !strings.Contains(err.Error(), "refused by name") {
-		t.Errorf("the vault's directory was listed: %v", err)
-	}
-	link := filepath.Join(dir, "tmp/innocent")
-	write(t, filepath.Join(dir, "tmp/x"), "")
-	if err := os.Symlink(filepath.Join(own, "broker"), link); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := r.Read(link, ReadAsk{}); err == nil || !strings.Contains(err.Error(), "leads to") {
-		t.Errorf("a link to a secret place was read: %v", err)
-	}
-	// A search under a directory holding a secret place skips it and names it.
-	write(t, filepath.Join(dir, "home/ops/notes.txt"), "harmless words\n")
-	a, err := r.Search(SearchAsk{Text: "harmless", Path: filepath.Join(dir, "home"), Depth: 8})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(a.Matches) != 1 || !strings.HasSuffix(a.Matches[0].File, "notes.txt") || len(a.Skipped) != 3 {
-		t.Errorf("search: matches %v, skipped %v", a.Matches, a.Skipped)
-	}
-	// What a public key or a certificate is, is not refused.
-	for _, p := range []string{filepath.Join(dir, "etc/ssh/ssh_host_ed25519_key.pub"), filepath.Join(dir, "etc/ssl/certs/ca.pem")} {
-		write(t, p, "harmless words\n")
-		if _, err := r.Read(p, ReadAsk{}); err != nil {
-			t.Errorf("%s was refused: %v", p, err)
-		}
-	}
-}
-
-// ADR 0310 §3: what the account's file modes refuse is refused — the first bound, below the names.
-func TestAFileTheAccountMayNotReadIsRefusedByItsMode(t *testing.T) {
-	if os.Geteuid() == 0 {
-		t.Skip("run as root, a file's mode refuses nothing")
-	}
-	r, dir := testReader(t)
-	p := filepath.Join(dir, "operators-only")
-	write(t, p, "the operator's words\n")
-	if err := os.Chmod(p, 0o000); err != nil {
-		t.Fatal(err)
-	}
-	if _, err := r.Read(p, ReadAsk{}); err == nil || !strings.Contains(err.Error(), "may not reach it") {
-		t.Errorf("a file of mode 0000: %v", err)
-	}
-	closed := filepath.Join(dir, "closed")
-	write(t, filepath.Join(closed, "inside"), "x")
-	if err := os.Chmod(closed, 0o700&^0o100); err != nil {
-		t.Fatal(err)
-	}
-	defer os.Chmod(closed, 0o755)
-	a, err := r.Stat([]string{filepath.Join(closed, "inside")}, false)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if got := a.Paths[0]; !strings.Contains(got.Stopped, "may not reach") {
-		t.Errorf("a path through a directory it may not search: %+v", got)
-	}
-}
-
-// ADR 0310 §2 and the bounds: a read over the size bound is cut at a line and says so; more than the most is
-// refused; lines and a tail are answered as asked.
-func TestAReadIsBounded(t *testing.T) {
-	r, dir := testReader(t)
-	p := filepath.Join(dir, "big")
-	var b strings.Builder
-	for i := 1; i <= 20000; i++ {
-		fmt.Fprintf(&b, "line %d of the file\n", i)
-	}
-	write(t, p, b.String())
-	a, err := r.Read(p, ReadAsk{})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(a.Text) > DefaultReadSize || !strings.Contains(a.Cut, fmt.Sprint(DefaultReadSize)) || a.From != 1 {
-		t.Errorf("a default read: %d bytes, cut %q", len(a.Text), a.Cut)
-	}
-	if _, err := r.Read(p, ReadAsk{Bytes: MaxReadSize + 1}); err == nil {
-		t.Error("more than the most a read answers was answered")
-	}
-	a, err = r.Read(p, ReadAsk{From: 10, Lines: 2})
-	if err != nil || a.Text != "line 10 of the file\nline 11 of the file\n" || a.From != 10 || a.Cut != "" {
-		t.Errorf("lines 10 and 11: %+v %v", a, err)
-	}
-	a, err = r.Read(p, ReadAsk{From: -2})
-	if err != nil || a.Text != "line 19999 of the file\nline 20000 of the file\n" || a.From != 19999 {
-		t.Errorf("the last two lines: %q from %d, %v", a.Text, a.From, err)
-	}
-	if _, err := r.Read(p, ReadAsk{From: 30000}); err == nil || !strings.Contains(err.Error(), "20000 lines") {
-		t.Errorf("a line past the end: %v", err)
-	}
-}
-
-// A binary file, a directory and a fifo are refused, and the fifo without waiting for a writer.
-func TestOnlyATextFileIsRead(t *testing.T) {
-	r, dir := testReader(t)
-	bin := filepath.Join(dir, "bin")
-	write(t, bin, "ELF\x00\x01\x02")
-	if _, err := r.Read(bin, ReadAsk{}); err == nil || !strings.Contains(err.Error(), "binary") {
-		t.Errorf("a binary file: %v", err)
-	}
-	if _, err := r.Read(dir, ReadAsk{}); err == nil || !strings.Contains(err.Error(), "directory") {
-		t.Errorf("a directory: %v", err)
-	}
-	fifo := filepath.Join(dir, "fifo")
-	if err := syscall.Mkfifo(fifo, 0o644); err != nil {
-		t.Fatal(err)
-	}
-	done := make(chan error, 1)
-	go func() { _, err := r.Read(fifo, ReadAsk{}); done <- err }()
-	select {
-	case err := <-done:
-		if err == nil || !strings.Contains(err.Error(), "fifo") {
-			t.Errorf("a fifo: %v", err)
-		}
-	case <-time.After(5 * time.Second):
-		t.Fatal("a read of a fifo waits for a writer")
-	}
-}
-
-// ADR 0310 §4: a line shaped like a secret is withheld, its number said, and the rest is answered.
-func TestALineShapedLikeASecretIsWithheld(t *testing.T) {
-	r, dir := testReader(t)
-	p := filepath.Join(dir, "app.conf")
-	write(t, p, "listen = /run/app.sock\ntoken = "+aToken+"\nuser = app\n")
-	a, err := r.Read(p, ReadAsk{})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if strings.Contains(a.Text, aToken) || !strings.Contains(a.Text, "user = app") ||
-		!strings.Contains(a.Text, "listen = /run/app.sock") || fmt.Sprint(a.Withheld) != "[2]" {
-		t.Errorf("read: %q withheld %v", a.Text, a.Withheld)
-	}
-	m, err := r.Search(SearchAsk{Text: "token", Path: dir})
-	if err != nil {
-		t.Fatal(err)
-	}
-	body, _ := json.Marshal(m)
-	if strings.Contains(string(body), aToken) || len(m.Matches) != 1 || len(m.Withheld) != 1 {
-		t.Errorf("search: %s", body)
-	}
-}
-
-// The bounds of a search: matches, depth, the most asked, and time — each met is said.
-func TestASearchIsBounded(t *testing.T) {
-	r, dir := testReader(t)
-	for i := 0; i < 30; i++ {
-		write(t, filepath.Join(dir, fmt.Sprintf("f%02d", i)), "needle\nneedle\n")
-	}
-	a, err := r.Search(SearchAsk{Text: "needle", Path: dir, Matches: 7})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(a.Matches) != 7 || !strings.HasPrefix(a.Bound, "matches") {
-		t.Errorf("seven matches asked: %d, bound %q", len(a.Matches), a.Bound)
-	}
-	if _, err := r.Search(SearchAsk{Text: "needle", Path: dir, Matches: MaxMatches + 1}); err == nil {
-		t.Error("more matches than the most were asked and answered")
-	}
-	if _, err := r.Search(SearchAsk{Text: "needle", Path: dir, Depth: MaxDepth + 1}); err == nil {
-		t.Error("deeper than the most was asked and answered")
-	}
-	deep := t.TempDir()
-	write(t, filepath.Join(deep, "a/b/c/shallow"), "needle\n")
-	write(t, filepath.Join(deep, "a/b/c/d/e/deep"), "needle\n")
-	a, err = r.Search(SearchAsk{Text: "needle", Path: deep, Depth: 3})
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(a.Matches) != 1 || !strings.HasSuffix(a.Matches[0].File, "shallow") {
-		t.Errorf("three deep: %+v", a.Matches)
-	}
-	// Case: as asked.
-	write(t, filepath.Join(deep, "case"), "NEEDLE\n")
-	if a, _ := r.Search(SearchAsk{Text: "needle", Path: filepath.Join(deep, "case")}); len(a.Matches) != 0 {
-		t.Error("a match whatever the case, unasked")
-	}
-	if a, _ := r.Search(SearchAsk{Text: "needle", Path: filepath.Join(deep, "case"), CaseInsensitive: true}); len(a.Matches) != 1 {
-		t.Error("no match whatever the case, asked")
-	}
-	// Time: a clock past the bound stops the walk and says so.
-	start := time.Now()
-	calls := 0
-	r.Now = func() time.Time { calls++; return start.Add(time.Duration(calls) * SearchTime / 3) }
-	a, err = r.Search(SearchAsk{Text: "needle", Path: dir})
-	if err != nil || !strings.HasPrefix(a.Bound, "time") {
-		t.Errorf("the time bound: %q %v", a.Bound, err)
-	}
-	// A fixed string: a pattern's characters are themselves.
-	write(t, filepath.Join(deep, "pattern"), "a.c\nabc\n")
-	if a, _ := r.Search(SearchAsk{Text: "a.c", Path: filepath.Join(deep, "pattern")}); len(a.Matches) != 1 || a.Matches[0].Line != 1 {
-		t.Errorf("a.c as a fixed string: %+v", a.Matches)
-	}
-}
-
-// The survey issue 418 was asked for: each component of a path with its owner, group, mode, whether it is a
-// link and to what, and whether it is a mount point — the link not followed unless asked.
-func TestStatSaysEachComponent(t *testing.T) {
-	r, dir := testReader(t)
-	data := filepath.Join(dir, "data")
-	write(t, filepath.Join(data, "real/file"), "x")
-	if err := os.Chmod(filepath.Join(data, "real"), os.ModeSetgid|0o750); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Symlink("real", filepath.Join(data, "link")); err != nil {
-		t.Fatal(err)
-	}
-	a, err := r.Stat([]string{filepath.Join(data, "link"), filepath.Join(data, "real/file")}, false)
-	if err != nil {
-		t.Fatal(err)
-	}
-	link := a.Paths[0]
-	last := link.Components[len(link.Components)-1]
-	if link.Components[0].Path != "/" || last.Type != "link" || last.Link != "real" || link.LeadsTo != "" {
-		t.Errorf("the link, not followed: %+v", link)
-	}
-	var dataC, realC Component
-	for _, c := range a.Paths[1].Components {
-		switch c.Path {
-		case data:
-			dataC = c
-		case filepath.Join(data, "real"):
-			realC = c
-		}
-	}
-	if dataC.Mount == nil || dataC.Mount.FS != "nfs4" {
-		t.Errorf("the mount point is not said: %+v", dataC)
-	}
-	if realC.Mode != "2750" || realC.Type != "directory" || realC.UID == nil || realC.Perms == "" {
-		t.Errorf("a component's mode: %+v", realC)
-	}
-	if uid := *realC.UID; uid == 1000 && realC.Owner != "ops" {
-		t.Errorf("owner %d named %q", uid, realC.Owner)
-	}
-	a, err = r.Stat([]string{filepath.Join(data, "link")}, true)
-	if err != nil {
-		t.Fatal(err)
-	}
-	if a.Paths[0].LeadsTo != filepath.Join(data, "real") || a.Paths[0].Leads == nil || a.Paths[0].Leads.Type != "directory" {
-		t.Errorf("followed: %+v", a.Paths[0])
-	}
-	a, err = r.Stat([]string{filepath.Join(dir, "missing/deeper")}, false)
-	if err != nil || !strings.Contains(a.Paths[0].Stopped, "does not exist") {
-		t.Errorf("a missing path: %+v %v", a, err)
-	}
-	if _, err := r.Stat([]string{"relative/path"}, false); err == nil {
-		t.Error("a relative path was answered")
-	}
-	many := make([]string, MaxPaths+1)
-	for i := range many {
-		many[i] = "/"
-	}
-	if _, err := r.Stat(many, false); err == nil {
-		t.Error("more paths than the most were answered")
-	}
-}
-
-func TestReadlinkSaysTheTargetAndWhereItLeads(t *testing.T) {
-	r, dir := testReader(t)
-	write(t, filepath.Join(dir, "target"), "")
-	if err := os.Symlink("target", filepath.Join(dir, "l1")); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Symlink("l1", filepath.Join(dir, "l2")); err != nil {
-		t.Fatal(err)
-	}
-	if err := os.Symlink("nowhere", filepath.Join(dir, "dangling")); err != nil {
-		t.Fatal(err)
-	}
-	a, err := r.Readlink(filepath.Join(dir, "l2"))
-	if err != nil || !a.IsLink || a.Link != "l1" || a.LeadsTo != filepath.Join(dir, "target") || !a.Exists {
-		t.Errorf("l2: %+v %v", a, err)
-	}
-	a, err = r.Readlink(filepath.Join(dir, "dangling"))
-	if err != nil || !a.IsLink || a.Exists || !strings.Contains(a.Stopped, "does not exist") {
-		t.Errorf("dangling: %+v %v", a, err)
-	}
-}
-
-func TestListSaysEveryEntry(t *testing.T) {
-	r, dir := testReader(t)
-	write(t, filepath.Join(dir, "d/a"), "abc")
-	if err := os.Symlink("a", filepath.Join(dir, "d/b")); err != nil {
-		t.Fatal(err)
-	}
-	a, err := r.List(filepath.Join(dir, "d"))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if a.Count != 2 || a.Entries[0].Name != "a" || *a.Entries[0].Size != 3 || a.Entries[1].Type != "link" || a.Entries[1].Link != "a" {
-		t.Errorf("list: %+v", a)
-	}
-	for i := 0; i < MaxEntries+5; i++ {
-		write(t, filepath.Join(dir, "many", fmt.Sprintf("e%05d", i)), "")
-	}
-	a, err = r.List(filepath.Join(dir, "many"))
-	if err != nil || len(a.Entries) != MaxEntries || a.Count != MaxEntries+5 || a.Cut == "" {
-		t.Errorf("a long directory: %d of %d, cut %q, %v", len(a.Entries), a.Count, a.Cut, err)
-	}
-}
-
-// getent passwd, getent group and id: an account with every group it is in, a group with its members, never a
-// password field.
-func TestAccountAndGroupLookup(t *testing.T) {
-	r, _ := testReader(t)
-	a, err := r.Account("ops", "")
-	if err != nil {
-		t.Fatal(err)
-	}
-	u := a.Accounts[0]
-	sort.Strings(u.Groups)
-	if u.UID != 1000 || u.Group != "ops" || u.Shell != "/usr/bin/zsh" || fmt.Sprint(u.Groups) != "[docker ops wheel]" {
-		t.Errorf("ops: %+v", u)
-	}
-	if a, err := r.Account("961", ""); err != nil || a.Accounts[0].Name != "mesh-reads" {
-		t.Errorf("by number: %+v %v", a, err)
-	}
-	g, err := r.Account("", "docker")
-	if err != nil || g.Groups[0].GID != 970 || fmt.Sprint(g.Groups[0].Members) != "[ops builder]" {
-		t.Errorf("docker: %+v %v", g, err)
-	}
-	if _, err := r.Account("nobody-here", ""); err == nil {
-		t.Error("a missing account was answered")
-	}
-	all, err := r.Account("", "")
-	if err != nil || len(all.Accounts) != 3 || len(all.Groups) != 5 {
-		t.Errorf("all: %+v %v", all, err)
-	}
-	body, _ := json.Marshal(all)
-	if strings.Contains(string(body), `"x"`) || strings.Contains(string(body), "password") {
-		t.Errorf("a password field is answered: %s", body)
-	}
-}
-
-// No answer is larger than the bound, whatever a verb made.
-func TestNoAnswerIsLargerThanTheBound(t *testing.T) {
-	if _, err := bounded(strings.Repeat("x", MaxAnswer+1), nil); err == nil {
-		t.Error("an answer over the bound was given")
-	}
-	if _, err := bounded("small", nil); err != nil {
-		t.Error(err)
-	}
-}
-
-// The seat's six verbs, as the controller defines them (mesh-controller internal/catalogue/reads.go).
-func TestItServesTheSeatsVerbs(t *testing.T) {
-	r, _ := testReader(t)
-	var names []string
-	for _, tool := range tools(r) {
-		names = append(names, tool.Name)
-	}
-	if fmt.Sprint(names) != "[node-reads.stat node-reads.readlink node-reads.list node-reads.read node-reads.search node-reads.account]" {
-		t.Errorf("verbs: %v", names)
-	}
-}

modules/mesh-reads/cmd/mesh-reads/refuse.go

@@ -1,109 +0,0 @@
-package main
-
-import (
-	"path/filepath"
-	"strings"
-
-	"git.novox.be/novox/mesh-sdk/go/outward"
-)
-
-// What is refused by name, before any read (novox/hq ADR 0310 §5), and what an answer withholds (§4).
-//
-// **Two lists of places.** The places the mesh knows a secret is kept on this node — every module's own-secret
-// directory, every credential file and grant directory, the vault's directories — come from the controller,
-// which composes them from the manifests (MESH_SECRET_PLACES). The known credential files of the programs
-// on a machine are this module's list, below: the mesh does not write them, so nothing else names them. Both
-// hold whatever the account's file modes would allow: the file modes are the first bound, the names the second.
-
-// knownDirs are directories that hold nothing but credentials, wherever they are: an account's keys.
-var knownDirs = map[string]bool{
-	".ssh": true, ".gnupg": true, ".password-store": true, ".aws": true, ".kube": true, ".azure": true,
-}
-
-// knownNames are file names that are a credential whatever directory they are in.
-var knownNames = map[string]bool{
-	".credentials.json": true, // the agent's credentials (Claude Code)
-	".netrc":            true, ".pgpass": true, ".git-credentials": true, ".npmrc": true, ".pypirc": true,
-	".my.cnf": true, ".vault-token": true, "credentials": true, "credentials.json": true,
-	"id_rsa": true, "id_dsa": true, "id_ecdsa": true, "id_ed25519": true, "id_ecdsa_sk": true, "id_ed25519_sk": true,
-	"shadow": true, "gshadow": true, "shadow-": true, "gshadow-": true, "opasswd": true,
-	"broker": true, // the mesh's name for a module's bus credential
-}
-
-// knownSuffixes are file name endings a credential has.
-var knownSuffixes = []string{".key", ".p12", ".pfx", ".jks", ".keystore", ".creds", ".nk", ".kdbx", "_key"}
-
-// knownPaths are the places on a machine that hold credentials and are not a module's.
-var knownPaths = []string{
-	"/etc/ssl/private", "/etc/wireguard", "/etc/NetworkManager/system-connections", "/etc/ipsec.d/private",
-	"/var/lib/iwd", "/etc/docker/key.json", "/root/.docker/config.json", "/var/lib/sss/secrets",
-}
-
-// Refuser says whether a path is a place a secret is kept.
-type Refuser struct {
-	// Places are the mesh's, from the controller: refused with everything beneath them.
-	Places []string
-}
-
-// Refused says why a path may not be read, or "" when it may. The path is clean and absolute.
-func (r Refuser) Refused(path string) string {
-	path = filepath.Clean(path)
-	for _, p := range r.Places {
-		if within(path, p) {
-			return "it is a place the mesh keeps a secret (" + p + ")"
-		}
-	}
-	for _, p := range knownPaths {
-		if within(path, p) {
-			return "it is a place a machine keeps credentials (" + p + ")"
-		}
-	}
-	parts := strings.Split(strings.TrimPrefix(path, "/"), "/")
-	for i, part := range parts {
-		if knownDirs[part] {
-			return "it is in " + part + ", which holds an account's credentials"
-		}
-		if i == len(parts)-1 {
-			if knownNames[part] {
-				return part + " is a known credential file"
-			}
-			for _, s := range knownSuffixes {
-				if strings.HasSuffix(part, s) && len(part) > len(s) {
-					return part + " is named as a key or a credential (" + s + ")"
-				}
-			}
-			if strings.HasSuffix(part, ".pem") && (strings.Contains(part, "key") || strings.Contains(part, "private")) {
-				return part + " is named as a private key"
-			}
-			if part == "config.json" && i > 0 && parts[i-1] == ".docker" {
-				return "a container registry login is kept there"
-			}
-		}
-	}
-	return ""
-}
-
-func within(path, place string) bool {
-	return path == place || strings.HasPrefix(path, strings.TrimSuffix(place, "/")+"/")
-}
-
-// Withheld is one piece of an answer the content rule kept back: where it was, and the class it carried.
-type Withheld struct {
-	At    string `json:"at"`
-	Class string `json:"why"`
-}
-
-// clean is the content rule's secret class (mesh-sdk outward, novox/hq ADR 0310 §4) over one piece of an
-// answer: the piece, or a mark in its place when it is shaped like a secret.
-//
-// **What a file holds, not what the file system names.** It judges a file's lines, a matching line, a link's
-// target, a mount's source and an account's words. A path and an entry's name are not judged: they are what
-// the caller named or the file system calls a thing, and the rule's random-run test takes a temporary
-// directory's or a container layer's name for a token, which would withhold the very survey asked for. A
-// place where a secret sits by name is refused before any read instead (Refuser).
-func clean(s string) (string, string) {
-	if refusal, ok := outward.CheckSecret(s); !ok {
-		return "‹withheld: " + refusal.What + "›", refusal.What
-	}
-	return s, ""
-}

modules/mesh-reads/go.mod

@@ -1,5 +0,0 @@
-module mesh-reads
-
-go 1.25.0
-
-require git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261012115257-4dc5f29d3e23

modules/mesh-reads/go.sum

@@ -1,2 +0,0 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261012115257-4dc5f29d3e23 h1:/F4NwABPAuFZlBx1yK4rdj6sVL5K1XvRlOnZZfNnlsQ=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261012115257-4dc5f29d3e23/go.mod h1:GFuZUElBZ9A++mxgIKo97aXXo+kV0uJ/UkbhQPPIbrY=

modules/mesh-reads/module.json

@@ -1,54 +0,0 @@
-{
-  "module": "mesh-reads",
-  "version": "1",
-  "runs-as": "mesh-reads",
-  "claims": [
-    {
-      "name": "node-reads",
-      "scope": "node",
-      "serves": [
-        "stat",
-        "readlink",
-        "list",
-        "read",
-        "search",
-        "account"
-      ]
-    }
-  ],
-  "own-secrets": {
-    "broker": "${dir:state}/broker"
-  },
-  "secrets-owner": "mesh-reads",
-  "resources": [
-    {
-      "id": "account",
-      "type": "user",
-      "name": "mesh-reads",
-      "shell": "/usr/bin/nologin",
-      "home": "/var/lib/mesh-reads"
-    },
-    {
-      "id": "state",
-      "type": "directory",
-      "mode": "0700",
-      "owner": "mesh-reads",
-      "place": "."
-    }
-  ],
-  "build": {
-    "artifacts": [
-      {
-        "name": "tools",
-        "kind": "bundle",
-        "language": "go",
-        "system": "arch",
-        "from": "cmd/mesh-reads",
-        "binary": "mesh-reads",
-        "loads": [
-          "mesh-reads"
-        ]
-      }
-    ]
-  }
-}

modules/messenger/README.md

@@ -148,7 +148,10 @@ new message is shown, so it rings once and no second message stands beside the f
 notification by its id; Telegram deletes the earlier message). A message said again goes alone, never as a
 line of a digest beside the message it follows; one first said inside a digest gets a message of its own the
 next time, and later words replace or edit that one. An ask's buttons live on that one message, so an ask that
-ends takes them away everywhere; its expiry is said with its day when it is not today.
+ends takes them away everywhere; its expiry is said with its day when it is not today. An ask replaced by a
+newer one about the same thing ends its own message too, which then says "Replaced by a newer question"; the
+newer ask shows a message of its own (issue 548). A message left open by an ask that already ended is ended on
+the next minute's sweep.
 
 - **Routing:** urgent to every kind that can send; a warning to the desk where it can send, otherwise to
   the channel that reaches the operator away; an ask to every kind that carries one of its answers.
@@ -187,7 +190,8 @@ The controller's `plan-moved` says each walk's start and end: `walk`, `phase` (`
   open, one line each; the ones that cleared counted. Delivered with nothing held and nothing open: one line —
   and nothing on a kind listed in the setting `only-what-needs-me`. What it carries is marked told on a kind
   only once the message was sent there. Until then each is kept owed in the state (`owed`): a message lost with a
-  restart before it was sent leaves them untold and owed, and the restarted router says each on its own.
+  restart before it was sent leaves them untold and owed, and the restarted router says each on its own. A
+  record that clears owes nothing more.
 - **The bound:** at its start plus `bound_seconds` (900 when not given), what is held and still open is said,
   with "The walk … is still running, since HH:MM", and the cleared counted; the walk holds nothing more. A walk
   whose end never comes is forgotten a day after it started. A start heard after its end opens nothing: the

modules/messenger/cmd/messenger/asks.go

@@ -691,30 +691,58 @@ func (h *Holder) showClosed(rec AskRecord) {
 	}
 	told := h.toldLine(rec) // read before the lock: it reads the ask's record
 	h.mu.Lock()
+	ownMessage := r.Origin == "ask"
 	// The first line is how it ended, which an ask's own message shows as its title (sayOn); the rest follows.
 	switch {
 	case rec.Warrant != nil && rec.Warrant.Outcome == asks.OutcomeChosen:
 		r.Answered = chosenLine(rec.Warrant, rec.Closed.In(h.zone())) + "\n" + told
 	case rec.State == string(asks.OutcomeExpired):
 		r.Answered = "No longer answerable: nobody answered in time.\n" + strings.TrimSuffix(capital(rec.Ask.OnExpiry), ".") + "."
-	case rec.State == string(asks.OutcomeReplaced):
+	case rec.State == string(asks.OutcomeReplaced) && !ownMessage:
+		// On a condition's message, which the newer ask takes over and shows in place.
 		r.Answered = ""
+	case rec.State == string(asks.OutcomeReplaced):
+		// Its own message: the newer ask looks for its message under its own key and opens one of its own, so
+		// this one ends here, on every channel that showed it (issue 548).
+		r.Answered = "Replaced by a newer question.\n" + rec.Asker + " asked again about the same thing; that question is the one to answer."
 	default:
 		r.Answered = "No longer needed."
 	}
-	ownMessage := r.Origin == "ask"
 	h.mu.Unlock()
 	if r.told() {
 		h.edit(r, "answered", false)
 	}
-	if ownMessage && rec.State != string(asks.OutcomeReplaced) {
+	if ownMessage {
 		h.mu.Lock()
 		r.Cleared = h.Now()
+		r.Owed = "" // an ended question is owed to nobody (the review of PR 238)
 		h.mu.Unlock()
 	}
 	h.persist(r)
 }
 
+// endLeftovers ends the own message of an ask that already ended and whose message stayed open: one left by a
+// router before issue 548 was fixed, whose replaced asks kept their messages for good. Its copies say how the
+// ask ended, as its end would have.
+func (h *Holder) endLeftovers() {
+	h.mu.Lock()
+	var ended []AskRecord
+	for _, r := range h.open {
+		if r.Origin != "ask" || r.Ask == "" || !r.Cleared.IsZero() {
+			continue
+		}
+		if e := h.asks[r.Ask]; e != nil && e.rec.State != StateOpen && e.rec.Record == r.Key {
+			ended = append(ended, e.rec)
+		}
+	}
+	h.mu.Unlock()
+	sort.Slice(ended, func(i, j int) bool { return ended[i].Record < ended[j].Record })
+	for _, rec := range ended {
+		h.Logf("[messenger] the message of %s stayed open after its ask ended (%s): ended now", rec.Record, rec.State)
+		h.showClosed(rec)
+	}
+}
+
 // chosenLine is how a chosen ask ended, in the operator's words: "You chose Approve at 13:30 on Telegram."
 func chosenLine(w *asks.Warrant, at time.Time) string {
 	who, where := "Somebody", ""
@@ -775,6 +803,7 @@ func (h *Holder) sweepAsks(now time.Time) {
 		}
 	}
 	h.mu.Unlock()
+	h.endLeftovers()
 	sort.Strings(expired)
 	for _, k := range expired {
 		e := h.askOf(k)

modules/messenger/cmd/messenger/holder.go

@@ -687,6 +687,7 @@ func (h *Holder) cleared(key string, quiet bool) {
 	}
 	old.Cleared = now
 	old.Pending = ""
+	old.Owed = "" // what a walk held of it is owed no more: it ended (the review of PR 238)
 	old.Folded = false
 	old.Seen = now
 	told := old.told()

modules/messenger/cmd/messenger/replaced_test.go

@@ -0,0 +1,111 @@
+package main
+
+import (
+	"strings"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/asks"
+)
+
+// openAskRecords are the records still open that show an ask as their own message.
+func openAskRecords(h *Holder) []string {
+	h.mu.Lock()
+	defer h.mu.Unlock()
+	var out []string
+	for k, r := range h.open {
+		if r.Origin == "ask" && r.Cleared.IsZero() {
+			out = append(out, k)
+		}
+	}
+	return out
+}
+
+// Issue 548: an ask replaced by a newer one about the same thing kept its own message open for good, its
+// buttons on the phone answering nothing. Two asks with the same About from one asker leave exactly one open
+// record, and the older one's message says it was replaced, its buttons gone, on every channel that showed it.
+func TestAReplacedAsksMessageEndsWithIt(t *testing.T) {
+	h, tg, dt, c, store, _ := newRouter(t)
+	link(h, store, c, "42", c.now().Add(-2*time.Hour))
+	a := ackAsk(c, "d-1")
+	a.About = "delivery.hq"
+	submit(t, h, "mesh-delivery", a)
+	settle(h, c)
+	if len(tg.sends) != 1 || len(dt.sends) != 1 {
+		t.Fatalf("the first ask was not shown: telegram %d, desktop %d", len(tg.sends), len(dt.sends))
+	}
+	b := ackAsk(c, "d-2")
+	b.About = "delivery.hq"
+	b.Headline = "Delivery of hq held, asked again"
+	submit(t, h, "mesh-delivery", b)
+	settle(h, c)
+	if got := openAskRecords(h); len(got) != 1 || got[0] != "ask.mesh-delivery.d-2" {
+		t.Fatalf("open ask records: %v; want only the newer ask's", got)
+	}
+	for _, ch := range []*fakeChannel{tg, dt} {
+		id := map[string]string{"telegram": "1", "desktop": "g14=1"}[ch.name]
+		m, edited := ch.edits[id]
+		for _, r := range ch.replaced {
+			if r.id == id {
+				m, edited = r.m, true
+			}
+		}
+		if !edited || len(m.Actions) != 0 || !strings.Contains(m.Title, "Replaced by a newer question") {
+			t.Errorf("%s: the replaced ask's message still stands: edited %v, %q %v", ch.name, edited, m.Text(), labelsOf(m))
+		}
+	}
+	if store.asks["mesh-delivery.d-1"].State != string(asks.OutcomeReplaced) {
+		t.Errorf("the older ask was not replaced: %s", store.asks["mesh-delivery.d-1"].State)
+	}
+}
+
+// The leftover of issue 548: a record from before the fix whose ask already ended keeps its message open. The
+// next tick ends it, as the ask's end would have.
+func TestAnAsksMessageLeftOpenAfterItsAskEndedIsEndedOnTheNextTick(t *testing.T) {
+	h, tg, _, c, store, _ := newRouter(t)
+	link(h, store, c, "42", c.now().Add(-2*time.Hour))
+	a := ackAsk(c, "d-1")
+	a.About = "delivery.hq"
+	submit(t, h, "mesh-delivery", a)
+	settle(h, c)
+	// Ended as replaced the way the router did before the fix: the ask's record only, its message untouched.
+	key := "mesh-delivery.d-1"
+	rec := store.asks[key]
+	rec.State, rec.Closed, rec.Told = string(asks.OutcomeReplaced), c.now(), true
+	rec.Warrant = &asks.Warrant{Ask: "d-1", Asker: "mesh-delivery", About: a.About, Outcome: asks.OutcomeReplaced,
+		Words: "a newer ask about the same thing replaced it", At: c.now()}
+	store.asks[key] = rec
+	h.keepAsk(key, rec, 99)
+	if got := openAskRecords(h); len(got) != 1 {
+		t.Fatalf("the leftover is not set up: %v", got)
+	}
+	c.pass(time.Minute)
+	stand(h, c)
+	h.Tick()
+	h.Flush()
+	if got := openAskRecords(h); len(got) != 0 {
+		t.Fatalf("the message of an ended ask is still open: %v", got)
+	}
+	if m, ok := tg.edits["1"]; !ok || len(m.Actions) != 0 || !strings.Contains(m.Title, "Replaced by a newer question") {
+		t.Errorf("the leftover's copy was not ended: %v %q %v", ok, m.Text(), labelsOf(m))
+	}
+}
+
+// The review of PR 238: what a walk owed of a record is dropped when the record clears, so a router that
+// restarts never says a held message of something that already ended.
+func TestAClearedRecordOwesNothing(t *testing.T) {
+	h, _, _, c, st := newHolder(t)
+	k := cond("machine.shanks.units", Warning, "2 failed services on shanks")
+	k.Raised = c.now()
+	h.Condition(EventRaised, k)
+	h.mu.Lock()
+	h.open[k.Key].Owed = "raised"
+	h.mu.Unlock()
+	h.cleared(k.Key, false)
+	if r := h.open[k.Key]; r.Owed != "" {
+		t.Errorf("a cleared record still owes %q", r.Owed)
+	}
+	if r := st.recs[k.Key]; r.Owed != "" {
+		t.Errorf("a cleared record still owes %q in the state", r.Owed)
+	}
+}

modules/nats/cmd/nats-tools/main.go

@@ -29,7 +29,7 @@ func limitOf(a map[string]any, fallback int) int {
 	return fallback
 }
 
-func tools(monitor Monitor, users func(context.Context) ([]byte, error)) []stdio.Tool {
+func tools(monitor Monitor, users func(context.Context) ([]byte, error), written func(context.Context) (time.Time, error)) []stdio.Tool {
 	get := func(path string) ([]byte, error) {
 		ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
 		defer cancel()
@@ -123,20 +123,28 @@ func tools(monitor Monitor, users func(context.Context) ([]byte, error)) []stdio
 				return Users(c, arg(a, "user")), nil
 			}},
 		{Name: "nats_user_can",
-			Description: "Whether a bus user may publish or subscribe to a subject, and the grant that allows it — the question behind a request that timed out because the bus refused it.",
+			Description: "Whether a bus user may publish or subscribe to a subject, and the grant that allows it — the question behind a request that timed out because the bus refused it. Also whether the running server holds it: `in_force` is true only when the user list on the machine allows it and the server reloaded its configuration after that list was written (novox/hq issue 353: a list sent is not a list the bus enforces until it reloads).",
 			Input:       map[string]any{"user": str("the user exactly, e.g. g14.node-tools"), "action": str("publish or subscribe"), "subject": str("a concrete subject, e.g. $KV.claude-code_servers.all.x")},
 			Run: func(a map[string]any) (any, error) {
 				c, err := conf()
 				if err != nil {
 					return nil, err
 				}
-				return UserCan(c, arg(a, "user"), arg(a, "action"), arg(a, "subject"))
+				answer, err := UserCan(c, arg(a, "user"), arg(a, "action"), arg(a, "subject"))
+				if err != nil {
+					return nil, err
+				}
+				ctx, cancel := context.WithTimeout(context.Background(), 20*time.Second)
+				defer cancel()
+				at, werr := written(ctx)
+				varz, verr := get("/varz")
+				return InForce(answer, at, werr, varz, verr), nil
 			}},
 	}
 }
 
 func main() {
-	if err := stdio.Serve("", tools(LiveMonitor(), ReadUsers)); err != nil {
+	if err := stdio.Serve("", tools(LiveMonitor(), ReadUsers, UsersWritten)); err != nil {
 		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}

modules/nats/cmd/nats-tools/monitor.go

@@ -65,3 +65,24 @@ func ReadUsers(ctx context.Context) ([]byte, error) {
 	}
 	return out, nil
 }
+
+// UsersWritten is when the composed user list the server includes was last written, read in the container
+// to the nanosecond (`stat -c %y`): what the server's last reload must come after for the list to be in force.
+func UsersWritten(ctx context.Context) (time.Time, error) {
+	container := env("MESH_NATS_CONTAINER", "mesh-broker-nats")
+	path := env("MESH_NATS_USERS_FILE", "/etc/nats/accounts.conf")
+	out, err := exec.CommandContext(ctx, "docker", "exec", container, "stat", "-c", "%y", path).Output()
+	if err != nil {
+		return time.Time{}, fmt.Errorf("when the bus's user list was written could not be read inside %s: %w", container, err)
+	}
+	return ParseWritten(string(out))
+}
+
+// ParseWritten reads `stat -c %y`: "2026-10-09 17:38:13.422211788 +0000".
+func ParseWritten(s string) (time.Time, error) {
+	t, err := time.Parse("2006-01-02 15:04:05.999999999 -0700", strings.TrimSpace(s))
+	if err != nil {
+		return time.Time{}, fmt.Errorf("when the bus's user list was written is not a time: %q", strings.TrimSpace(s))
+	}
+	return t, nil
+}

modules/nats/cmd/nats-tools/tools.go

@@ -536,3 +536,39 @@ func UserCan(conf []byte, user, action, subject string) (map[string]any, error)
 	}
 	return nil, fmt.Errorf("the bus has no user %q; nats_users lists them", user)
 }
+
+// InForce adds to a UserCan answer whether the running server holds what the file says (novox/hq issue 353):
+// `in_force` only when the grant is allowed in the file and the server's last configuration load
+// (`config_load_time` of /varz) came after the file was last written. Anything not known is not in force, said
+// in `why`: an asker waiting for its grant must not take a list sent for a list the bus enforces.
+func InForce(answer map[string]any, written time.Time, writtenErr error, varz []byte, varzErr error) map[string]any {
+	answer["in_force"] = false
+	switch {
+	case writtenErr != nil:
+		answer["why"] = writtenErr.Error()
+		return answer
+	case varzErr != nil:
+		answer["why"] = "the server's last configuration load could not be read: " + varzErr.Error()
+		return answer
+	}
+	var v struct {
+		ConfigLoadTime time.Time `json:"config_load_time"`
+	}
+	if err := json.Unmarshal(varz, &v); err != nil || v.ConfigLoadTime.IsZero() {
+		answer["why"] = "the server does not say when it last loaded its configuration"
+		return answer
+	}
+	answer["file_written"] = written.UTC().Format(time.RFC3339Nano)
+	answer["server_loaded"] = v.ConfigLoadTime.UTC().Format(time.RFC3339Nano)
+	loaded := !v.ConfigLoadTime.Before(written)
+	allowed, _ := answer["allowed"].(bool)
+	switch {
+	case !allowed:
+		answer["why"] = "the user list on the machine does not allow it"
+	case !loaded:
+		answer["why"] = "the user list on the machine allows it, and the server has not reloaded since it was written"
+	default:
+		answer["in_force"] = true
+	}
+	return answer
+}

modules/nats/cmd/nats-tools/tools_test.go

@@ -2,6 +2,8 @@ package main
 
 import (
 	"encoding/json"
+	"errors"
+	"fmt"
 	"strings"
 	"testing"
 	"time"
@@ -170,3 +172,39 @@ func TestClosedConnectionsArePerUserAndNameAndSayWhichWereDropped(t *testing.T)
 		t.Errorf("narrowed: %+v", got)
 	}
 }
+
+// novox/hq issue 353: a grant written to the user list is in force only once the server reloaded after the
+// write; anything not known is not in force.
+func TestAGrantIsInForceOnlyWhenTheServerReloadedAfterTheListWasWritten(t *testing.T) {
+	written, err := ParseWritten("2026-10-09 17:55:56.422211788 +0200\n")
+	if err != nil {
+		t.Fatal(err)
+	}
+	varz := func(at string) []byte { return []byte(`{"config_load_time":"` + at + `"}`) }
+	allowed := func() map[string]any { return map[string]any{"allowed": true} }
+	cases := []struct {
+		name   string
+		answer map[string]any
+		werr   error
+		varz   []byte
+		verr   error
+		want   bool
+		says   string
+	}{
+		{"reloaded after the write", allowed(), nil, varz("2026-10-09T15:56:05.1Z"), nil, true, ""},
+		{"reloaded before the write", allowed(), nil, varz("2026-10-09T15:55:56.4Z"), nil, false, "has not reloaded"},
+		{"not allowed in the file", map[string]any{"allowed": false}, nil, varz("2026-10-09T15:56:05Z"), nil, false, "does not allow"},
+		{"the write time unknown", allowed(), errors.New("no container"), varz("2026-10-09T15:56:05Z"), nil, false, "no container"},
+		{"the server unknown", allowed(), nil, nil, errors.New("refused"), false, "could not be read"},
+		{"a server that says no load time", allowed(), nil, []byte(`{}`), nil, false, "does not say"},
+	}
+	for _, c := range cases {
+		got := InForce(c.answer, written, c.werr, c.varz, c.verr)
+		if got["in_force"] != c.want || (c.says != "" && !strings.Contains(fmt.Sprint(got["why"]), c.says)) {
+			t.Errorf("%s: %v", c.name, got)
+		}
+	}
+	if _, err := ParseWritten("yesterday"); err == nil {
+		t.Error("a write time that is not one was read")
+	}
+}