Merge remote-tracking branch 'origin/main' into feat/try-speed

Pins mesh-sdk fix/1921-every-failure, whose check ask no longer stops a
level at its first failing test step, so one check runs every package
and names every failure. A captured fixture with a failing test in each
of two packages proves the build module's test step names both.

.gitignore

@@ -34,3 +34,306 @@ modules/mesh-build-image/cmd/mesh-build-image/mesh-build-image
 /checks/paths/paths
 /modules/mesh-build-go/mesh-build-go
 /modules/mesh-delivery-gate/mesh-delivery-gate
+
+# A binary built in place, named like its module directory or a cmd directory, in the module root or in that cmd directory
+# (issue 1921, try speed S13), for every module; the lint step of every check refuses one a change adds, a module added
+# later included.
+/modules/adwaita/adwaita
+/modules/adwaita/adwaita-tools
+/modules/adwaita/cmd/adwaita-tools/adwaita-tools
+/modules/artifact-store-tools/artifact-store-tools
+/modules/artifact-store-tools/cmd/artifact-store-tools/artifact-store-tools
+/modules/asus-zephyrus-g14/asus-zephyrus-g14
+/modules/asus-zephyrus-g14/zephyrus
+/modules/asus-zephyrus-g14/cmd/zephyrus/zephyrus
+/modules/audit-logger/audit-logger
+/modules/avahi/avahi
+/modules/avahi/avahi-tools
+/modules/avahi/cmd/avahi-tools/avahi-tools
+/modules/baserow/baserow
+/modules/blueman/blueman
+/modules/blueman/blueman-tools
+/modules/blueman/cmd/blueman-tools/blueman-tools
+/modules/bluetooth/bluetooth
+/modules/bluetooth/bluetooth-tools
+/modules/bluetooth/cmd/bluetooth-tools/bluetooth-tools
+/modules/brother/brother
+/modules/brother/cmd/brother/brother
+/modules/buildah/buildah
+/modules/ca-trust/ca-trust
+/modules/claude-code/claude-code
+/modules/claude-code/cmd/claude-code/claude-code
+/modules/claude-licence-manager/claude-licence-manager
+/modules/claude-licence-manager/cmd/claude-licence-manager/claude-licence-manager
+/modules/clipmenu/clipmenu
+/modules/clipmenu/clipmenu-tools
+/modules/clipmenu/cmd/clipmenu-tools/clipmenu-tools
+/modules/confluence/confluence
+/modules/cups/cups
+/modules/cups/cups-tools
+/modules/cups/cmd/cups-tools/cups-tools
+/modules/dbus/dbus
+/modules/dbus/dbus-tools
+/modules/dbus/cmd/dbus-tools/dbus-tools
+/modules/desk-channel/desk-channel
+/modules/desk-channel/cmd/desk-channel/desk-channel
+/modules/dev-tools/dev-tools
+/modules/disk-load/disk-load
+/modules/disk-load/cmd/disk-load/disk-load
+/modules/distribution/distribution
+/modules/dmenu/dmenu
+/modules/dmenu/dmenu-tools
+/modules/dmenu/cmd/dmenu-tools/dmenu-tools
+/modules/dnsmasq/dnsmasq
+/modules/dnsmasq/dnsmasq-tools
+/modules/dnsmasq/cmd/dnsmasq-tools/dnsmasq-tools
+/modules/docker/docker
+/modules/docker/docker-tools
+/modules/docker/cmd/docker-tools/docker-tools
+/modules/docker-compose/docker-compose
+/modules/docker-compose/docker-compose-tools
+/modules/docker-compose/cmd/docker-compose-tools/docker-compose-tools
+/modules/dunst/dunst
+/modules/dunst/dunst-tools
+/modules/dunst/cmd/dunst-tools/dunst-tools
+/modules/fail2ban/fail2ban
+/modules/fail2ban/fail2ban-tools
+/modules/fail2ban/cmd/fail2ban-tools/fail2ban-tools
+/modules/feh/feh
+/modules/feh/feh-tools
+/modules/feh/cmd/feh-tools/feh-tools
+/modules/flatpak/flatpak
+/modules/flatpak/flatpak-tools
+/modules/flatpak/cmd/flatpak-tools/flatpak-tools
+/modules/fonts/fonts
+/modules/fonts/fonts-tools
+/modules/fonts/cmd/fonts-tools/fonts-tools
+/modules/forticlient/forticlient
+/modules/forticlient/forticlient-tools
+/modules/forticlient/cmd/forticlient-tools/forticlient-tools
+/modules/gitea/gitea
+/modules/gitea/agent-teams
+/modules/gitea/cmd/agent-teams/agent-teams
+/modules/gitea/agent-token
+/modules/gitea/cmd/agent-token/agent-token
+/modules/gitea/forge
+/modules/gitea/cmd/forge/forge
+/modules/gitea/forge-account-provider
+/modules/gitea/cmd/forge-account-provider/forge-account-provider
+/modules/gitea/npm-registry
+/modules/gitea/cmd/npm-registry/npm-registry
+/modules/gitea/repositories
+/modules/gitea/cmd/repositories/repositories
+/modules/gitlab/gitlab
+/modules/gnome-keyring/gnome-keyring
+/modules/gnome-keyring/gnome-keyring-tools
+/modules/gnome-keyring/cmd/gnome-keyring-tools/gnome-keyring-tools
+/modules/go/go
+/modules/grafana/grafana
+/modules/hello-web/hello-web
+/modules/home-assistant/home-assistant
+/modules/hostname/hostname
+/modules/hostname/hostname-tools
+/modules/hostname/cmd/hostname-tools/hostname-tools
+/modules/i3/i3
+/modules/i3/i3-tools
+/modules/i3/cmd/i3-tools/i3-tools
+/modules/i3status-rust/i3status-rust
+/modules/i3status-rust/i3status-rust-tools
+/modules/i3status-rust/cmd/i3status-rust-tools/i3status-rust-tools
+/modules/icecast/icecast
+/modules/influxdb/influxdb
+/modules/invoicing/invoicing
+/modules/jira/jira
+/modules/kernel/kernel
+/modules/kernel/kernel-tools
+/modules/kernel/cmd/kernel-tools/kernel-tools
+/modules/keycloak/keycloak
+/modules/keycloak/keycloak-provider
+/modules/keycloak/cmd/keycloak-provider/keycloak-provider
+/modules/lab/lab
+/modules/lemurs/lemurs
+/modules/lemurs/lemurs-tools
+/modules/lemurs/cmd/lemurs-tools/lemurs-tools
+/modules/letta/letta
+/modules/localization/localization
+/modules/localization/localization-tools
+/modules/localization/cmd/localization-tools/localization-tools
+/modules/local-model-consumer/local-model-consumer
+/modules/logrotate/logrotate
+/modules/logrotate/logrotate-tools
+/modules/logrotate/cmd/logrotate-tools/logrotate-tools
+/modules/mailu/mailu
+/modules/mailu/automx
+/modules/mailu/cmd/automx/automx
+/modules/marrytts/marrytts
+/modules/matrix/matrix
+/modules/memory-pressure/memory-pressure
+/modules/memory-pressure/cmd/memory-pressure/memory-pressure
+/modules/mesh-build-go/mesh-build-go
+/modules/mesh-build-go/cmd/mesh-build-go/mesh-build-go
+/modules/mesh-build-image/mesh-build-image
+/modules/mesh-build-image/cmd/mesh-build-image/mesh-build-image
+/modules/mesh-build-node/mesh-build-node
+/modules/mesh-build-node/cmd/mesh-build-node/mesh-build-node
+/modules/mesh-catalog/mesh-catalog
+/modules/mesh-cli/mesh-cli
+/modules/mesh-cli/cmd/mesh-cli/mesh-cli
+/modules/mesh-config/mesh-config
+/modules/mesh-config/cmd/mesh-config/mesh-config
+/modules/mesh-delivery-gate/mesh-delivery-gate
+/modules/mesh-delivery-gate/cmd/mesh-delivery-gate/mesh-delivery-gate
+/modules/mesh-files/mesh-files
+/modules/mesh-files/cmd/mesh-files/mesh-files
+/modules/mesh-issues/mesh-issues
+/modules/mesh-issues/cmd/mesh-issues/mesh-issues
+/modules/mesh-knowledge/mesh-knowledge
+/modules/mesh-knowledge/cmd/mesh-knowledge/mesh-knowledge
+/modules/mesh-mail/mesh-mail
+/modules/mesh-mail/cmd/mesh-mail/mesh-mail
+/modules/mesh-mail-notifier/mesh-mail-notifier
+/modules/mesh-mail-notifier/cmd/mesh-mail-notifier/mesh-mail-notifier
+/modules/mesh-mail-reader/mesh-mail-reader
+/modules/mesh-mail-reader/cmd/mesh-mail-reader/mesh-mail-reader
+/modules/mesh-mail-web/mesh-mail-web
+/modules/mesh-mail-web/cmd/mesh-mail-web/mesh-mail-web
+/modules/mesh-provisioner/mesh-provisioner
+/modules/mesh-provisioner/cmd/mesh-provisioner/mesh-provisioner
+/modules/mesh-provisioner-client/mesh-provisioner-client
+/modules/mesh-provisioner-client/cmd/mesh-provisioner-client/mesh-provisioner-client
+/modules/mesh-reads/mesh-reads
+/modules/mesh-reads/cmd/mesh-reads/mesh-reads
+/modules/mesh-vault/mesh-vault
+/modules/mesh-vault/cmd/mesh-vault/mesh-vault
+/modules/mesh-watcher/mesh-watcher
+/modules/mesh-watcher/cmd/mesh-watcher/mesh-watcher
+/modules/messenger/messenger
+/modules/messenger/cmd/messenger/messenger
+/modules/minio/minio
+/modules/minio/object-store
+/modules/minio/cmd/object-store/object-store
+/modules/model-usage/model-usage
+/modules/mongodb/mongodb
+/modules/mosquitto/mosquitto
+/modules/mounts/mounts
+/modules/mounts/cmd/mounts/mounts
+/modules/mssql/mssql
+/modules/n8n/n8n
+/modules/nats/nats
+/modules/nats/mesh-nats-snapshot
+/modules/nats/cmd/mesh-nats-snapshot/mesh-nats-snapshot
+/modules/nats/nats-tools
+/modules/nats/cmd/nats-tools/nats-tools
+/modules/netcheck/netcheck
+/modules/netcheck/cmd/netcheck/netcheck
+/modules/networkmanager/networkmanager
+/modules/networkmanager/uplink-tools
+/modules/networkmanager/cmd/uplink-tools/uplink-tools
+/modules/nextcloud/nextcloud
+/modules/nextcloud-client/nextcloud-client
+/modules/nextcloud-client/nextcloud-client-tools
+/modules/nextcloud-client/cmd/nextcloud-client-tools/nextcloud-client-tools
+/modules/nfs-server/nfs-server
+/modules/nfs-server/cmd/nfs-server/nfs-server
+/modules/nftables/nftables
+/modules/nm-applet/nm-applet
+/modules/nm-applet/nm-applet-tools
+/modules/nm-applet/cmd/nm-applet-tools/nm-applet-tools
+/modules/node-env/node-env
+/modules/nodejs/nodejs
+/modules/nodered/nodered
+/modules/ollama/ollama
+/modules/only-office/only-office
+/modules/only-office/cmd/only-office/only-office
+/modules/openai-consumer/openai-consumer
+/modules/openrazer/openrazer
+/modules/openrazer/openrazer-tools
+/modules/openrazer/cmd/openrazer-tools/openrazer-tools
+/modules/pacman/pacman
+/modules/pacman/pacman-tools
+/modules/pacman/cmd/pacman-tools/pacman-tools
+/modules/photos-eef/photos-eef
+/modules/photos-filip/photos-filip
+/modules/picom/picom
+/modules/picom/picom-tools
+/modules/picom/cmd/picom-tools/picom-tools
+/modules/polychromatic/polychromatic
+/modules/polychromatic/polychromatic-tools
+/modules/polychromatic/cmd/polychromatic-tools/polychromatic-tools
+/modules/postgres/postgres
+/modules/postgres/postgres-provider
+/modules/postgres/cmd/postgres-provider/postgres-provider
+/modules/power/power
+/modules/power/cmd/power/power
+/modules/powerlevel10k/powerlevel10k
+/modules/records/records
+/modules/records/cmd/records/records
+/modules/redis/redis
+/modules/restic/restic
+/modules/restic/restic-backups
+/modules/restic/cmd/restic-backups/restic-backups
+/modules/rofi/rofi
+/modules/rofi/rofi-tools
+/modules/rofi/cmd/rofi-tools/rofi-tools
+/modules/route-adapter/route-adapter
+/modules/route-adapter/route-provider
+/modules/route-adapter/cmd/route-provider/route-provider
+/modules/screen-lock/screen-lock
+/modules/screen-lock/screen-lock-tools
+/modules/screen-lock/cmd/screen-lock-tools/screen-lock-tools
+/modules/searxng/searxng
+/modules/sensors/sensors
+/modules/sensors/cmd/sensors/sensors
+/modules/showcase/showcase
+/modules/slack/slack
+/modules/slack/slack-tools
+/modules/slack/cmd/slack-tools/slack-tools
+/modules/snapd/snapd
+/modules/snapd/snapd-tools
+/modules/snapd/cmd/snapd-tools/snapd-tools
+/modules/ssh-client/ssh-client
+/modules/ssh-client/ssh-client-tools
+/modules/ssh-client/cmd/ssh-client-tools/ssh-client-tools
+/modules/sshd/sshd
+/modules/step-ca/step-ca
+/modules/sudo/sudo
+/modules/sudo/sudo-tools
+/modules/sudo/cmd/sudo-tools/sudo-tools
+/modules/supabase/supabase
+/modules/systemd/systemd
+/modules/systemd/systemd-tools
+/modules/systemd/cmd/systemd-tools/systemd-tools
+/modules/systemd-networkd/systemd-networkd
+/modules/systemd-networkd/uplink-tools
+/modules/systemd-networkd/cmd/uplink-tools/uplink-tools
+/modules/systemd-resolved/systemd-resolved
+/modules/systemd-resolved/resolver-tools
+/modules/systemd-resolved/cmd/resolver-tools/resolver-tools
+/modules/telegram/telegram
+/modules/telegram/cmd/telegram/telegram
+/modules/time-sync/time-sync
+/modules/time-sync/time-sync-tools
+/modules/time-sync/cmd/time-sync-tools/time-sync-tools
+/modules/triggerhappy/triggerhappy
+/modules/triggerhappy/triggerhappy-tools
+/modules/triggerhappy/cmd/triggerhappy-tools/triggerhappy-tools
+/modules/umami/umami
+/modules/unifi/unifi
+/modules/website/website
+/modules/xclip/xclip
+/modules/xclip/xclip-tools
+/modules/xclip/cmd/xclip-tools/xclip-tools
+/modules/xdg/xdg
+/modules/xdg/xdg-tools
+/modules/xdg/cmd/xdg-tools/xdg-tools
+/modules/xorg/xorg
+/modules/xorg/cmd/xorg/xorg
+/modules/xterm/xterm
+/modules/xterm/xterm-tools
+/modules/xterm/cmd/xterm-tools/xterm-tools
+/modules/zfs/zfs
+/modules/zfs/zfs-tools
+/modules/zfs/cmd/zfs-tools/zfs-tools
+/modules/zsh/zsh
+/modules/zsh-autosuggestions/zsh-autosuggestions
+/modules/zsh-syntax-highlighting/zsh-syntax-highlighting

modules/mesh-build-go/cmd/mesh-build-go/asks.go

@@ -80,12 +80,8 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskGo}
 	}
 	capacity := m.Capacity
-	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
-	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
-	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
-		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
@@ -96,7 +92,7 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		}
 	}
 	return &buildstep.Puller{Source: source, Language: delivery.AskGo, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
+		Capacity: capacity, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
 				return nil, err

modules/mesh-build-go/cmd/mesh-build-go/binaries.go

@@ -0,0 +1,90 @@
+package main
+
+// Stray build output (issue 1921, try speed S13): the lint step fails a change that adds an executable (ELF or Mach-O) or
+// a file over MaxAddedFile, naming each, unless the repository's .binaries-allowed lists its path. Build binaries were
+// committed three times in one night; the forge keeps them for ever.
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+
+	"git.novox.be/novox/mesh-sdk/go/forgekey"
+)
+
+// MaxAddedFile is the largest file a change may add without .binaries-allowed naming it.
+const MaxAddedFile = 5 << 20
+
+// BinariesAllowed is the file in a repository's root listing, one path per line ("#" starts a comment), the executables
+// and large files it keeps on purpose.
+const BinariesAllowed = ".binaries-allowed"
+
+// executableMagic are the first bytes of an ELF and of each Mach-O form (32 and 64 bits, both byte orders, universal).
+var executableMagic = [][]byte{[]byte("\x7fELF"), {0xfe, 0xed, 0xfa, 0xce}, {0xfe, 0xed, 0xfa, 0xcf}, {0xce, 0xfa, 0xed, 0xfe},
+	{0xcf, 0xfa, 0xed, 0xfe}, {0xca, 0xfe, 0xba, 0xbe}}
+
+// addedBinaries is the lint finding of the files the merge adds to the trunk that are executables or over MaxAddedFile,
+// nil when there is none. The paths come from git (the merge commit against its first parent, the trunk); a tree with no
+// merge (no first parent) adds nothing to judge.
+func (m *Module) addedBinaries(ctx context.Context, run forgekey.Runner, tree string) []Failure {
+	r := run(ctx, []string{"GIT_TERMINAL_PROMPT=0"}, "git", "-C", tree, "diff", "--name-only", "--no-renames", "--diff-filter=A", "HEAD^1", "HEAD")
+	if r.Status != 0 || r.Err != "" {
+		return nil
+	}
+	allowed := map[string]bool{}
+	if raw, err := os.ReadFile(filepath.Join(tree, BinariesAllowed)); err == nil {
+		scan := bufio.NewScanner(bytes.NewReader(raw))
+		for scan.Scan() {
+			if l := strings.TrimSpace(scan.Text()); l != "" && !strings.HasPrefix(l, "#") {
+				allowed[filepath.ToSlash(l)] = true
+			}
+		}
+	}
+	var found []string
+	for _, p := range strings.Split(r.Stdout, "\n") {
+		if p = strings.TrimSpace(p); p == "" || allowed[p] {
+			continue
+		}
+		path := filepath.Join(tree, filepath.FromSlash(p))
+		info, err := os.Lstat(path)
+		if err != nil || !info.Mode().IsRegular() {
+			continue // narrowed away, or not a file
+		}
+		if info.Size() > MaxAddedFile {
+			found = append(found, fmt.Sprintf("%s (%d bytes, over %d)", p, info.Size(), MaxAddedFile))
+			continue
+		}
+		if isExecutable(path) {
+			found = append(found, p+" (an executable)")
+		}
+	}
+	if len(found) == 0 {
+		return nil
+	}
+	sort.Strings(found)
+	return []Failure{{Package: ".", Test: "binaries", Step: StepLint,
+		Output: "the change adds build output or a large file (remove it, or list its path in " + BinariesAllowed + "): " + strings.Join(found, ", ")}}
+}
+
+func isExecutable(path string) bool {
+	f, err := os.Open(path)
+	if err != nil {
+		return false
+	}
+	defer f.Close()
+	head := make([]byte, 4)
+	if n, _ := f.Read(head); n < 4 {
+		return false
+	}
+	for _, magic := range executableMagic {
+		if bytes.Equal(head, magic) {
+			return true
+		}
+	}
+	return false
+}

modules/mesh-build-go/cmd/mesh-build-go/binaries_test.go

@@ -0,0 +1,67 @@
+package main
+
+import (
+	"context"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/forgekey"
+)
+
+// Issue 1921, try speed S13: the lint step fails a change that adds an executable (ELF or Mach-O) or a file over 5 MB,
+// naming it, unless .binaries-allowed in the repository's root lists its path; a file the change does not add is not
+// judged, and neither is an allowed one.
+func TestTheLintStepFailsAChangeThatAddsABinaryOrALargeFile(t *testing.T) {
+	m, states, ws, _ := workspaceFor(t, "slow")
+	tree := filepath.Join(m.Work, ws, "tree")
+	write := func(name string, body []byte) {
+		os.MkdirAll(filepath.Dir(filepath.Join(tree, name)), 0o755)
+		if err := os.WriteFile(filepath.Join(tree, name), body, 0o644); err != nil {
+			t.Fatal(err)
+		}
+	}
+	write("go.mod", []byte("module fixture/slow\n"))
+	elf := append([]byte("\x7fELF"), make([]byte, 64)...)
+	macho := append([]byte{0xcf, 0xfa, 0xed, 0xfe}, make([]byte, 64)...)
+	write("modules/x/cmd/x/x", elf)
+	write("modules/y/y", macho)
+	write("big.tar", make([]byte, 5<<20+1))
+	write("tools/allowed-tool", elf)
+	write("old/binary", elf) // there before the change
+	write("modules/x/doc.md", []byte("text\n"))
+	write(".binaries-allowed", []byte("# kept on purpose\ntools/allowed-tool\n"))
+	inner := m.Run
+	m.Run = func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		if name == "git" && strings.Contains(strings.Join(args, " "), "--diff-filter=A") {
+			return forgekey.Ran{Stdout: "modules/x/cmd/x/x\nmodules/y/y\nbig.tar\ntools/allowed-tool\nmodules/x/doc.md\n.binaries-allowed\n"}
+		}
+		return inner(ctx, env, name, args...)
+	}
+	res, st := runUnit(t, m, states, ws)
+	if st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	var found []Failure
+	for _, f := range res.Failed {
+		if f.Test == "binaries" {
+			found = append(found, f)
+		}
+	}
+	if res.Passed || len(found) != 1 || found[0].Step != StepLint {
+		t.Fatalf("failed = %+v, want one lint finding of the binaries", res.Failed)
+	}
+	out := found[0].Output
+	for _, want := range []string{"modules/x/cmd/x/x", "modules/y/y", "big.tar"} {
+		if !strings.Contains(out, want) {
+			t.Errorf("the finding does not name %s: %s", want, out)
+		}
+	}
+	for _, not := range []string{"allowed-tool", "old/binary", "doc.md"} {
+		if strings.Contains(out, not) {
+			t.Errorf("the finding names %s: %s", not, out)
+		}
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/cgo_test.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"slices"
+	"strings"
+	"testing"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+)
+
+// 1921/S11 (the lead's decision): a check compiles and runs with CGO_ENABLED=0, as a production build does, so it tests
+// what ships and the warm cache matches; the lint's go vet, a compile alone, writes the shared cache, while a go test that
+// runs a test binary reads it beneath the ask's own layer.
+func TestACheckRunsWithoutCgoAndOnlyItsCompileWritesTheSharedCache(t *testing.T) {
+	m, states, ws, calls := workspaceFor(t, "failing")
+	var seen []shutOff
+	m.Run = throughBubblewrap(t, m.Run, &seen)
+	if _, st := runUnit(t, m, states, ws); st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	for _, c := range *calls {
+		if strings.HasPrefix(c.line, "go ") && !slices.Contains(c.env, "CGO_ENABLED=0") {
+			t.Errorf("%s ran without CGO_ENABLED=0: %v", c.line, c.env)
+		}
+	}
+	vets, tests := 0, 0
+	for _, s := range seen {
+		switch {
+		case strings.Contains(s.command, " vet "):
+			vets++
+			checkShutOff(t, m, s, true) // the shared caches bound read-write
+		case strings.Contains(s.command, " test "):
+			tests++
+			checkShutOff(t, m, s, false)
+		}
+	}
+	if vets == 0 || tests == 0 {
+		t.Errorf("%d vets and %d tests ran shut off, want both", vets, tests)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/fetch.go

@@ -49,6 +49,51 @@ type FetchResult struct {
 	// Beside are the sibling repositories placed as plain directories under the workspace's beside directory, which
 	// build_go_test hands to the tests as MESH_CHECK_BESIDE (ADR 0484 clause 4).
 	Beside []Sibling `json:"beside,omitempty"`
+	// Took is how long each phase of the fetch ran, in seconds (issue 1921, the try speed-up's first measurement): what
+	// the checker reports as one "clone" time, split.
+	Took *FetchTook `json:"took,omitempty"`
+}
+
+// FetchTook is the time of each phase of a fetch, in seconds; its phases add up to Total. Mirror is bringing the
+// repository's mirror to the commit, Fetch the fetch and checkout into the tree, Merge the merge preview, Dissociate
+// the repack that makes the tree independent of the mirror, Beside the placing of the siblings (their own mirror,
+// fetch and repack), Other the narrowing and the listing of the go.mod directories, and Modules the download and
+// verify of the Go modules.
+type FetchTook struct {
+	Mirror     float64 `json:"mirror"`
+	Fetch      float64 `json:"fetch"`
+	Merge      float64 `json:"preview"` // named for the merge preview, apart from the result's merge commit
+	Dissociate float64 `json:"dissociate"`
+	Beside     float64 `json:"siblings"`
+	Other      float64 `json:"other"`
+	Modules    float64 `json:"modules"`
+	Total      float64 `json:"total"`
+}
+
+// phaseClock stamps the phases of a fetch: each lap is the time since the one before, so the laps add up to the total.
+type phaseClock struct {
+	now          func() time.Time
+	start, since time.Time
+}
+
+func newPhaseClock(now func() time.Time) *phaseClock {
+	t := now()
+	return &phaseClock{now: now, start: t, since: t}
+}
+
+// lap adds the time since the last lap to *into.
+func (c *phaseClock) lap(into *float64) {
+	t := c.now()
+	*into += t.Sub(c.since).Seconds()
+	c.since = t
+}
+
+func (c *phaseClock) total() float64 { return c.since.Sub(c.start).Seconds() }
+
+// String is the one log line a fetch says of its phases.
+func (t FetchTook) String() string {
+	return fmt.Sprintf("mirror %.1fs, fetch %.1fs, merge %.1fs, dissociate %.1fs, beside %.1fs, other %.1fs, modules %.1fs, total %.1fs",
+		t.Mirror, t.Fetch, t.Merge, t.Dissociate, t.Beside, t.Other, t.Modules, t.Total)
 }
 
 // fetchTool is the fetch step tool.
@@ -109,43 +154,77 @@ func (m *Module) fetch(ctx context.Context, args map[string]any) (res any, err e
 }
 
 func (m *Module) fetchInto(ctx context.Context, req buildstep.FetchRequest, id string, siblings []siblingArg) (any, error) {
+	res, err := m.fetchPhases(ctx, req, id, siblings)
+	if err != nil {
+		return nil, err
+	}
+	if m.Say != nil && res.Took != nil {
+		m.Say("the fetch of %s at %s took %s", req.Repository, short(req.Commit), res.Took)
+	}
+	return res, nil
+}
+
+func short(commit string) string {
+	if len(commit) > 12 {
+		return commit[:12]
+	}
+	return commit
+}
+
+func (m *Module) fetchPhases(ctx context.Context, req buildstep.FetchRequest, id string, siblings []siblingArg) (FetchResult, error) {
 	repository, commit, ref, base := req.Repository, req.Commit, req.Ref, req.Base
 	var err error
+	took := &FetchTook{}
+	clock := newPhaseClock(m.now)
+	defer func() { took.Total = clock.total() }()
 	root := filepath.Join(m.Work, id)
 	tree := filepath.Join(root, "tree")
 	if err := os.MkdirAll(tree, 0o700); err != nil {
-		return nil, err
+		return FetchResult{}, err
 	}
 	remote := m.remote(repository)
-	if err := buildstep.FetchCommit(ctx, m.Run, tree, remote, commit, ref, m.fetchOptions(ctx, repository, commit, ref)...); err != nil {
+	opts := m.fetchOptions(ctx, repository, commit, ref)
-		return nil, err
+	mergeOpts := m.FetchOptions
-	}
-	res := FetchResult{Workspace: id, Commit: commit}
 	if base != "" {
-		if err := m.merge(ctx, &res, tree, remote, base, commit); err != nil {
+		// The mirror is brought to the trunk commit too, so the merge preview deepens the tree from it and asks the forge
-			return nil, err
+		// for no history the mirror holds (issue 1921, try speed S6).
+		mergeOpts = m.fetchOptions(ctx, repository, base, "")
+	}
+	clock.lap(&took.Mirror)
+	if err := buildstep.FetchCommit(ctx, m.Run, tree, remote, commit, ref, opts...); err != nil {
+		return FetchResult{}, err
+	}
+	clock.lap(&took.Fetch)
+	res := FetchResult{Workspace: id, Commit: commit, Took: took}
+	if base != "" {
+		if err := m.merge(ctx, &res, tree, remote, base, commit, mergeOpts); err != nil {
+			return FetchResult{}, err
 		}
 	}
+	clock.lap(&took.Merge)
 	if err := m.dissociate(ctx, tree); err != nil {
-		return nil, err
+		return FetchResult{}, err
 	}
+	clock.lap(&took.Dissociate)
 	if res.Beside, err = m.placeSiblings(ctx, root, siblings); err != nil {
-		return nil, err
+		return FetchResult{}, err
 	}
+	clock.lap(&took.Beside)
 	if (base == "" || res.Merge != "") && len(req.Paths) > 0 {
 		if err := buildstep.Narrow(tree, req); err != nil {
-			return nil, err
+			return FetchResult{}, err
 		}
 		// Said beside the tree, so the steps that list the tree's go.mod files leave out those narrowed away.
 		if err := os.WriteFile(filepath.Join(root, narrowedMark), nil, 0o600); err != nil {
-			return nil, err
+			return FetchResult{}, err
 		}
 	}
 	dirs, err := m.goModDirs(ctx, tree)
 	if err != nil {
-		return nil, err
+		return FetchResult{}, err
 	}
 	res.Modules = dirs
+	clock.lap(&took.Other)
 	if base != "" && res.Merge == "" {
 		return res, nil // a conflict: the tree is at the trunk, nothing of the head is built or tested
 	}
@@ -168,9 +247,10 @@ func (m *Module) fetchInto(ctx context.Context, req buildstep.FetchRequest, id s
 		}()
 	}
 	wg.Wait()
+	clock.lap(&took.Modules)
 	for _, err := range errs {
 		if err != nil {
-			return nil, err
+			return FetchResult{}, err
 		}
 	}
 	return res, nil
@@ -293,6 +373,7 @@ func (m *Module) goEnv() []string {
 		modcache = m.GoModCache
 	}
 	return []string{
+		"CGO_ENABLED=0", // as a production build compiles (build.go), so a check tests what ships (issue 1921, S11)
 		"GOTOOLCHAIN=local",
 		"GOFLAGS=-mod=mod",
 		"GOMODCACHE=" + modcache,

modules/mesh-build-go/cmd/mesh-build-go/fetch_test.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 	"strings"
@@ -302,3 +303,61 @@ func TestWorkAndCacheAreTheDirectoriesTheManifestPlacesOutsideTheHome(t *testing
 		}
 	}
 }
+
+// 1921/S1: the fetch says how long each phase ran (mirror, fetch, merge, dissociate, beside, other, modules), and the
+// phases add up to its total, so a try's "clone" time is split into its parts.
+func TestTheFetchSaysTheTimeOfEachPhaseAndTheyAddUpToTheTotal(t *testing.T) {
+	var mu sync.Mutex
+	now := time.Date(2026, 10, 25, 9, 0, 0, 0, time.UTC)
+	advance := func(s int) {
+		mu.Lock()
+		now = now.Add(time.Duration(s) * time.Second)
+		mu.Unlock()
+	}
+	f := &fakeStep{gomods: "go.mod\n", files: map[string]string{"go.mod": "module x\n", "go.sum": ""}, rule: func(line string) (forgekey.Ran, bool) {
+		switch {
+		case strings.Contains(line, "/mirror/") && strings.Contains(line, " fetch "):
+			advance(1)
+		case strings.Contains(line, " fetch --no-tags --depth 1 "):
+			advance(2)
+		case strings.Contains(line, " merge --no-ff "):
+			advance(3)
+		case strings.Contains(line, " repack "):
+			advance(4)
+		case strings.HasSuffix(line, " mod download"):
+			advance(5)
+		}
+		return forgekey.Ran{}, false
+	}}
+	m, states := fetchModule(t, f)
+	said := []string{}
+	m.Say = func(format string, a ...any) { said = append(said, fmt.Sprintf(format, a...)) }
+	m.Now = func() time.Time { mu.Lock(); defer mu.Unlock(); return now }
+	args := map[string]any{"repository": "novox/mesh-sdk", "commit": commitSHA, "base": strings.Repeat("b", 40)}
+	if _, err := fetchTool(t, m)(args); err != nil {
+		t.Fatal(err)
+	}
+	st := states.waitEnd(t)
+	if st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	var res FetchResult
+	if err := json.Unmarshal(st.Result, &res); err != nil {
+		t.Fatal(err)
+	}
+	if res.Took == nil {
+		t.Fatalf("the result says no phase times: %s", st.Result)
+	}
+	got := *res.Took
+	// the mirror is brought to the head and to the base (1 s each), and the preview deepens from it (1 s) before merging
+	want := FetchTook{Mirror: 2, Fetch: 2, Merge: 4, Dissociate: 4, Modules: 5, Total: 17}
+	if got != want {
+		t.Errorf("phases = %+v, want %+v", got, want)
+	}
+	if sum := got.Mirror + got.Fetch + got.Merge + got.Dissociate + got.Beside + got.Other + got.Modules; sum != got.Total {
+		t.Errorf("the phases add up to %v, not the total %v", sum, got.Total)
+	}
+	if !strings.Contains(strings.Join(said, "\n"), "dissociate 4.0s") {
+		t.Errorf("no log line names the phases: %q", said)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/integration.go

@@ -10,8 +10,10 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"sort"
 	"strconv"
 	"strings"
+	"sync"
 	"time"
 
 	"git.novox.be/novox/mesh-sdk/go/buildstep"
@@ -62,34 +64,99 @@ func (m *Module) integrationHere(ctx context.Context, workspace, tree string, pa
 	if err != nil {
 		return nil, err
 	}
-	postgres, stopStore, err := m.startStore(ctx, run)
-	if err != nil {
-		return nil, fmt.Errorf("the integration level's store: %w", err)
-	}
-	defer stopStore()
-	nats, stopBus, err := m.startBus(ctx, filepath.Join(run, "nats"))
-	if err != nil {
-		return nil, fmt.Errorf("the integration level's bus: %w", err)
-	}
-	defer stopBus()
-	env := append([]string{"MESH_TEST_POSTGRES=" + postgres, "MESH_TEST_NATS=" + nats}, m.besideEnv(workspace)...)
-	// Compiling counts as setup: the tests are built once, here, with the addresses a TestMain may read, and the run
-	// below finds them built. Whether they compile is for the run to say; its failure is not read here.
 	// Only the directories the selected packages lie in compile (ADR 0536 §3); no selection is every directory.
 	byDir, err := packagesByDir(tree, dirs, packages)
 	if err != nil {
 		return nil, err
 	}
+	// The tests the tags add, not the unit tests again (issue 1921, try speed S7): only the packages holding one compile
+	// and run, with a -run pattern naming them. A try that names its own pattern runs it as asked.
+	var runByDir map[string]string
+	if pattern == "" {
+		tagged, err := taggedTests(tree, dirs, packages, integrationTags)
+		if err != nil {
+			return nil, err
+		}
+		if len(tagged) == 0 {
+			res := &TestResult{Level: LevelIntegration, Packages: []PackageResult{}}
+			res.judge(m.integrationBounds())
+			return res, nil // no test the tags add: nothing to start or run
+		}
+		byDir, runByDir, packages = map[string][]string{}, map[string]string{}, nil
+		for d, tr := range tagged {
+			byDir[d], runByDir[d] = tr.packages, tr.pattern
+			packages = append(packages, tr.packages...)
+		}
+		sort.Strings(packages)
+	}
+	// The store, the bus and the compile start together (issue 1921, try speed S5); the setup is the longest of them.
+	// The compile runs no test binary (-exec true), so it needs neither server: whether the tests compile is for the run
+	// to say, and its failure is not read here; the run below finds them built.
+	var (
+		wg                 sync.WaitGroup
+		postgres, nats     string
+		stopStore, stopBus func()
+		storeErr, busErr   error
+		crash              any
+		crashMu            sync.Mutex
+	)
+	guard := func() {
+		if p := recover(); p != nil {
+			crashMu.Lock()
+			crash = p
+			crashMu.Unlock()
+		}
+	}
+	wg.Add(2)
+	go func() { defer wg.Done(); defer guard(); postgres, stopStore, storeErr = m.startStore(ctx, run) }()
+	go func() {
+		defer wg.Done()
+		defer guard()
+		nats, stopBus, busErr = m.startBus(ctx, filepath.Join(run, "nats"))
+	}()
+	slots := m.slots(workspace) // shared with the ask's unit level (issue 1921, try speed S10)
+	var slotErr error
 	for _, d := range dirs {
 		if len(byDir[d]) == 0 {
 			continue
 		}
-		m.Run(ctx, append(m.goEnvFor(filepath.Join(tree, d)), env...), "go", append([]string{"-C", filepath.Join(tree, d), "test", "-tags", strings.Join(integrationTags, ","), "-run", "^$", "-count=1"}, byDir[d]...)...)
+		release, err := slots.acquire(ctx)
+		if err != nil {
+			slotErr = err
+			break
+		}
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			defer release()
+			defer guard()
+			m.Run(ctx, m.goEnvFor(filepath.Join(tree, d)), "go", append([]string{"-C", filepath.Join(tree, d), "test", "-tags", strings.Join(integrationTags, ","), "-exec", "true", "-count=1"}, byDir[d]...)...)
+		}()
 	}
+	wg.Wait()
+	if stopStore != nil {
+		defer stopStore()
+	}
+	if stopBus != nil {
+		defer stopBus()
+	}
+	if crash != nil {
+		panic(crash)
+	}
+	if slotErr != nil {
+		return nil, slotErr
+	}
+	if storeErr != nil {
+		return nil, fmt.Errorf("the integration level's store: %w", storeErr)
+	}
+	if busErr != nil {
+		return nil, fmt.Errorf("the integration level's bus: %w", busErr)
+	}
+	env := append([]string{"MESH_TEST_POSTGRES=" + postgres, "MESH_TEST_NATS=" + nats}, m.besideEnv(workspace)...)
 	setup := m.clock().Sub(began)
 
 	return m.runLevel(ctx, tree, levelOpts{
-		workspace: workspace, run: pattern,
+		workspace: workspace, run: pattern, runByDir: runByDir,
 		level: LevelIntegration, tags: integrationTags, packages: packages, bounds: m.integrationBounds(),
 		env:   env,
 		setup: setup, wall: true,

modules/mesh-build-go/cmd/mesh-build-go/integration_level_test.go

@@ -6,6 +6,7 @@ import (
 	"net/url"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 	"sync"
 	"testing"
@@ -35,6 +36,8 @@ type integFake struct {
 	// command runs, with its line.
 	gomods string
 	onTest func(line string)
+	// onCompile is called, unlocked, as each compile of the setup runs (issue 1921, try speed S5).
+	onCompile func(line string)
 }
 
 func newIntegFake(t *testing.T, captured string) *integFake {
@@ -71,7 +74,10 @@ func (f *integFake) run(ctx context.Context, env []string, name string, args ...
 			return forgekey.Ran{Stdout: f.gomods}
 		}
 		return forgekey.Ran{Stdout: "go.mod\n"}
-	case name == "go" && strings.Contains(line, "-run ^$"):
+	case name == "go" && strings.Contains(line, "-exec true"):
+		if f.onCompile != nil {
+			f.onCompile(line)
+		}
 		f.tick("compile")
 	case name == "go":
 		if f.onTest != nil {
@@ -123,9 +129,32 @@ func integModule(t *testing.T, f *integFake) (*Module, *keptStates) {
 	if err := os.MkdirAll(filepath.Join(m.Work, "ws1", "tree"), 0o755); err != nil {
 		t.Fatal(err)
 	}
+	// A test the integration tag adds, so the level has a package to run (issue 1921, try speed S7).
+	writeTaggedTest(t, filepath.Join(m.Work, "ws1", "tree"), "fixture/slow")
 	return m, states
 }
 
+// taggedTestFile is the file writeTaggedTest writes: one test the integration tag adds.
+const taggedTestFile = "level_integration_test.go"
+
+// writeTaggedTest gives the go.mod directory dir the module path mp and one test the integration tag adds, in its root
+// package and in its package x.
+func writeTaggedTest(t *testing.T, dir, mp string) {
+	t.Helper()
+	if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module "+mp+"\n\ngo 1.25.0\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+	body := "//go:build integration\n\npackage x\n\nimport \"testing\"\n\nfunc TestTakesAWhile(t *testing.T) {}\n"
+	for _, d := range []string{dir, filepath.Join(dir, "x")} {
+		if err := os.MkdirAll(d, 0o755); err != nil {
+			t.Fatal(err)
+		}
+		if err := os.WriteFile(filepath.Join(d, taggedTestFile), []byte(body), 0o644); err != nil {
+			t.Fatal(err)
+		}
+	}
+}
+
 func runLevelTool(t *testing.T, m *Module, states *keptStates, level string) (TestResult, delivery.Step) {
 	t.Helper()
 	for _, tool := range m.Tools(m.StepTools()) {
@@ -314,11 +343,11 @@ func TestAStoreThatDoesNotStartEndsTheStepFailedAndLeavesNothing(t *testing.T) {
 	if !strings.Contains(f.lines(), " stop") {
 		t.Errorf("the half-started store was not stopped:\n%s", f.lines())
 	}
-	if f.busDir != "" {
+	if f.busDir != "" && !f.busDown {
-		t.Errorf("the bus was started after the store failed")
+		t.Errorf("the bus, started beside the store, was not stopped after the store failed")
 	}
-	if entries, _ := os.ReadDir(filepath.Join(m.Work, "ws1")); len(entries) != 1 || entries[0].Name() != "tree" {
+	if left := workspaceLeft(filepath.Join(m.Work, "ws1")); len(left) != 1 || left[0] != "tree" {
-		t.Errorf("the workspace holds %v, want only its tree", entries)
+		t.Errorf("the workspace holds %v, want only its tree", left)
 	}
 }
 
@@ -377,3 +406,138 @@ func TestTheSocketPathStaysUnderTheLimitForALongRunDirectory(t *testing.T) {
 		t.Errorf("the short socket directory %s outlived the store (%v)", sock, err)
 	}
 }
+
+// 1921/S5: the setup compiles the go.mod directories side by side, up to the bound, beside the store's and the bus's
+// start, and compiles without running a test binary, so it needs neither; the setup stays one number.
+func TestTheSetupCompilesTheDirectoriesAtOnceBesideTheStoreAndTheBus(t *testing.T) {
+	f := newIntegFake(t, "slow")
+	f.gomods = "a/go.mod\nb/go.mod\nc/go.mod\nd/go.mod\ne/go.mod\n"
+	var mu sync.Mutex
+	running, most := 0, 0
+	storeStarting, storeUp, overlap := false, false, false
+	f.onCompile = func(line string) {
+		mu.Lock()
+		running++
+		most = max(most, running)
+		mu.Unlock()
+		time.Sleep(40 * time.Millisecond)
+		mu.Lock()
+		running--
+		mu.Unlock()
+	}
+	m, states := integModule(t, f)
+	m.Parallel = 3
+	tree := filepath.Join(m.Work, "ws1", "tree")
+	for _, d := range []string{"a", "b", "c", "d", "e"} {
+		os.MkdirAll(filepath.Join(tree, d), 0o755)
+		writeTaggedTest(t, filepath.Join(tree, d), "x/"+d)
+	}
+	inner := m.Run
+	m.Run = func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		line := strings.Join(args, " ")
+		if name == "pg_ctl" && strings.HasSuffix(line, " start") {
+			mu.Lock()
+			storeStarting = true
+			mu.Unlock()
+			time.Sleep(100 * time.Millisecond) // the store takes a while to start
+			defer func() { mu.Lock(); storeUp = true; mu.Unlock() }()
+		}
+		if name == "go" && strings.Contains(line, "-exec true") {
+			time.Sleep(10 * time.Millisecond)
+			mu.Lock()
+			overlap = overlap || (storeStarting && !storeUp)
+			mu.Unlock()
+			for _, e := range env {
+				if strings.HasPrefix(e, "MESH_TEST_") {
+					t.Errorf("the compile was given %s: it runs no test binary", e)
+				}
+			}
+		}
+		return inner(ctx, env, name, args...)
+	}
+	res, st := runLevelTool(t, m, states, "integration")
+	if st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	if most != 3 {
+		t.Errorf("%d compiles ran at once, want the bound of 3", most)
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	if !overlap {
+		t.Errorf("no compile ran while the store was starting:\n%s", f.lines())
+	}
+	if res.Setup < 0 {
+		t.Errorf("setup = %v", res.Setup)
+	}
+}
+
+// 1921/S7: the integration level runs the tests its tags add, not the unit tests again: only the packages holding a
+// tagged test compile and run, with a -run pattern naming those tests; a tree with no tagged test starts no store.
+func TestTheIntegrationLevelRunsOnlyTheTestsItsTagsAdd(t *testing.T) {
+	f := newIntegFake(t, "slow")
+	m, states := integModule(t, f)
+	tree := filepath.Join(m.Work, "ws1", "tree")
+	os.RemoveAll(filepath.Join(tree, "x"))
+	os.Remove(filepath.Join(tree, taggedTestFile))
+	for name, body := range map[string]string{
+		"go.mod":                      "module fixture/slow\n",
+		"unit/u_test.go":              "package unit\n\nimport \"testing\"\n\nfunc TestUnit(t *testing.T) {}\n",
+		"store/s_test.go":             "package store\n\nimport \"testing\"\n\nfunc TestPlain(t *testing.T) {}\n",
+		"store/s_integration_test.go": "//go:build integration\n\npackage store\n\nimport \"testing\"\n\nfunc TestMain(m *testing.M) {}\nfunc TestReal(t *testing.T) {}\nfunc Testable() {}\nfunc helper() {}\n",
+		"store/fake_test.go":          "//go:build !integration\n\npackage store\n\nimport \"testing\"\n\nfunc TestFake(t *testing.T) {}\n",
+		"iso/iso_test.go":             "//go:build integration && isolation && linux\n\npackage iso\n\nimport \"testing\"\n\nfunc TestShutOff(t *testing.T) {}\n",
+		"plat/p_linux_test.go":        "//go:build linux\n\npackage plat\n\nimport \"testing\"\n\nfunc TestLinux(t *testing.T) {}\n",
+	} {
+		os.MkdirAll(filepath.Dir(filepath.Join(tree, name)), 0o755)
+		if err := os.WriteFile(filepath.Join(tree, name), []byte(body), 0o644); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if _, st := runLevelTool(t, m, states, "integration"); st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	var compiled, ran []string
+	for _, c := range f.calls {
+		switch {
+		case strings.HasPrefix(c.line, "go ") && strings.Contains(c.line, "-exec true"):
+			compiled = append(compiled, c.line)
+		case strings.HasPrefix(c.line, "go ") && strings.Contains(c.line, " -json"):
+			ran = append(ran, c.line)
+		}
+	}
+	if len(ran) != 1 || !strings.Contains(ran[0], "-run ^(TestReal|TestShutOff)$") ||
+		!strings.HasSuffix(ran[0], " fixture/slow/iso fixture/slow/store") {
+		t.Errorf("the run = %q, want the tagged tests of iso and store alone", ran)
+	}
+	if len(compiled) != 1 || !strings.HasSuffix(compiled[0], " fixture/slow/iso fixture/slow/store") {
+		t.Errorf("the compile = %q, want iso and store alone", compiled)
+	}
+
+	g := newIntegFake(t, "slow")
+	m, states = integModule(t, g)
+	tree = filepath.Join(m.Work, "ws1", "tree")
+	os.RemoveAll(filepath.Join(tree, "x"))
+	os.Remove(filepath.Join(tree, taggedTestFile))
+	os.WriteFile(filepath.Join(tree, "u_test.go"), []byte("package x\n\nimport \"testing\"\n\nfunc TestUnit(t *testing.T) {}\n"), 0o644)
+	res, st := runLevelTool(t, m, states, "integration")
+	if st.State != delivery.StepPassed || !res.Passed || !res.NoTests {
+		t.Fatalf("a tree with no tagged test: %s %+v", st.State, res)
+	}
+	if strings.Contains(g.lines(), "pg_ctl") || strings.Contains(g.lines(), "go -C") {
+		t.Errorf("a tree with no tagged test started the store or ran go:\n%s", g.lines())
+	}
+}
+
+// workspaceLeft is what a workspace holds besides the directories its ask keeps there (askDirs: its cache layer and its
+// bound on processes, gone with the workspace; issue 1921, S2 and S10).
+func workspaceLeft(dir string) []string {
+	var left []string
+	entries, _ := os.ReadDir(dir)
+	for _, e := range entries {
+		if !slices.Contains(askDirs, e.Name()) {
+			left = append(left, e.Name())
+		}
+	}
+	return left
+}

modules/mesh-build-go/cmd/mesh-build-go/isolate.go

@@ -29,21 +29,30 @@ func (m *Module) caches() []string {
 }
 
 // isolation is how a run step of the workspace is shut off: the workspace (its tree, its siblings, its run directories,
-// its packed artifacts) read-write, the caches beneath a throwaway layer unless write, and an environment of a PATH and
+// its packed artifacts) read-write, the caches beneath the ask's own layer unless write, and an environment of a PATH and
 // a locale alone (the step's HOME is its own, inside its /tmp).
 func (m *Module) isolation(workspace string, write bool) buildstep.Isolation {
 	path := os.Getenv("PATH")
 	if path == "" {
 		path = defaultPath
 	}
-	return buildstep.Isolation{
+	iso := buildstep.Isolation{
 		Workspace:   filepath.Join(m.Work, workspace),
 		Caches:      m.caches(),
 		WriteCaches: write,
 		Env:         []string{"PATH=" + path, "LC_ALL=C"},
 	}
+	if !write {
+		// What one command of the ask compiles is kept for its later commands (the vet, the unit tests, the integration
+		// level's compile), in the workspace and gone with it (issue 1921, try speed S2).
+		iso.CacheLayer = filepath.Join(iso.Workspace, cacheLayerDir)
+	}
+	return iso
 }
 
+// cacheLayerDir is the directory in a workspace's root where an ask keeps what its commands wrote into the caches.
+const cacheLayerDir = "cachelayer"
+
 // stepRunner is the runner of a run step of the workspace: buildstep.Isolated over m.Run, so every command it runs is
 // shut off; write is true for a trunk build alone (the shared caches are written by trunk builds only). Inside is the
 // integration level's own process, already running shut off (level.go): it runs its commands as they are.

modules/mesh-build-go/cmd/mesh-build-go/isolate_test.go

@@ -20,6 +20,7 @@ import (
 type shutOff struct {
 	flags                    []string
 	binds, roBinds, overlays []string
+	uppers                   map[string]string // the writable layer each --overlay gives a cache: cache -> upper
 	env                      []string
 	command                  string
 	chdir                    string
@@ -27,7 +28,7 @@ type shutOff struct {
 
 // bwrapArity is how many words each bubblewrap option the SDK writes takes.
 var bwrapArity = map[string]int{"--unshare-all": 0, "--die-with-parent": 0, "--new-session": 0, "--clearenv": 0,
-	"--proc": 1, "--dev": 1, "--tmpfs": 1, "--dir": 1, "--chdir": 1, "--overlay-src": 1, "--tmp-overlay": 1,
+	"--proc": 1, "--dev": 1, "--tmpfs": 1, "--dir": 1, "--chdir": 1, "--overlay-src": 1, "--tmp-overlay": 1, "--overlay": 3,
 	"--ro-bind": 2, "--ro-bind-try": 2, "--bind": 2, "--symlink": 2, "--setenv": 2}
 
 // throughBubblewrap is the fake runner of a step's tests: a bubblewrap command is read back (recorded in seen) and its
@@ -56,6 +57,11 @@ func throughBubblewrap(t *testing.T, run forgekey.Runner, seen *[]shutOff) forge
 				s.roBinds = append(s.roBinds, args[i+1])
 			case "--overlay-src":
 				s.overlays = append(s.overlays, args[i+1])
+			case "--overlay":
+				if s.uppers == nil {
+					s.uppers = map[string]string{}
+				}
+				s.uppers[args[i+3]] = args[i+1]
 			case "--setenv":
 				s.env = append(s.env, args[i+1]+"="+args[i+2])
 			case "--chdir":
@@ -105,6 +111,9 @@ func checkShutOff(t *testing.T, m *Module, s shutOff, write bool) {
 			t.Errorf("a trunk build's %s does not write the shared cache %s (bound %v, layered %v)", s.command, c, bound, layered)
 		case !write && (bound || !layered):
 			t.Errorf("%s may write the shared cache %s (bound %v, layered %v): only a trunk build does", s.command, c, bound, layered)
+		case !write && !strings.HasPrefix(s.uppers[c], filepath.Join(m.Work, "ws1", "cachelayer")+"/"):
+			// 1921/S2: what one command of the ask compiles is kept for its later commands, in the workspace
+			t.Errorf("%s writes the cache %s into %q, not the ask's cache layer in its workspace", s.command, c, s.uppers[c])
 		}
 	}
 	if want := filepath.Join(m.Work, "ws1"); !slices.Contains(s.binds, want) {
@@ -131,7 +140,8 @@ func TestTheUnitLevelRunsEveryGoTestShutOff(t *testing.T) {
 		t.Fatalf("%d go commands ran, %d of them shut off: %v", ran, len(seen), *calls)
 	}
 	for _, s := range seen {
-		checkShutOff(t, m, s, false)
+		// the lint's go vet, a compile alone, writes the shared cache (issue 1921, S11): cgo_test.go
+		checkShutOff(t, m, s, strings.Contains(s.command, " vet "))
 	}
 }
 

modules/mesh-build-go/cmd/mesh-build-go/level.go

@@ -41,6 +41,8 @@ type levelSpec struct {
 	Run       string        `json:"run,omitempty"`
 	Setup     time.Duration `json:"setup"`
 	Bound     time.Duration `json:"bound"`
+	// Parallel is the ask's bound on processes, which the process shares with the ask's other level (issue 1921, S10).
+	Parallel int `json:"parallel,omitempty"`
 }
 
 // levelAnswer is the one line the process prints: the level's result or the digest, or why it could not run.
@@ -83,7 +85,7 @@ func (m *Module) integrationShutOff(ctx context.Context, workspace string, packa
 // workspace read-write, the program alone read-only, the shared caches beneath a throwaway layer, the Node build
 // module's toolchains read-only for the integration level.
 func (m *Module) shutOff(ctx context.Context, exe string, spec levelSpec) (levelAnswer, error) {
-	spec.Work, spec.Cache = m.Work, m.Cache
+	spec.Work, spec.Cache, spec.Parallel = m.Work, m.Cache, m.parallel()
 	raw, err := json.Marshal(spec)
 	if err != nil {
 		return levelAnswer{}, err
@@ -165,7 +167,7 @@ func runLevelProcess(args []string) int {
 		return say(levelAnswer{Error: fmt.Sprintf("%q is not a workspace id", spec.Workspace)})
 	}
 	m := &Module{Inside: true, Recipe: Current(), Work: spec.Work, Cache: spec.Cache, Home: os.Getenv("HOME"), UnitBound: spec.Bound,
-		IntegrationBounds: Bounds{Setup: spec.Setup, Run: spec.Bound}, Say: func(string, ...any) {}}
+		IntegrationBounds: Bounds{Setup: spec.Setup, Run: spec.Bound}, Parallel: spec.Parallel, Say: func(string, ...any) {}}
 	m.Run = StepRunner(m.Home)
 	return say(m.answer(context.Background(), spec))
 }

modules/mesh-build-go/cmd/mesh-build-go/levels.go

@@ -10,7 +10,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"regexp"
-	"slices"
 	"sort"
 	"strings"
 	"time"
@@ -53,17 +52,19 @@ type TestTime struct {
 // Failure is a test that failed, or a package that failed with no test to name (a build that failed, a TestMain that
 // panicked); Output is the last lines it wrote, up to outputBytes (issue 1901), and Cause the first line of what the
 // test reported as its error (t.Error, t.Fatal), without its file and line, when go test said which lines those were.
-// **A failure that is not one test's assertion carries its real cause too** (issue 1901, its third meeting): the
-// "panic:" line (a timeout's with the tests it found running), a "fatal error:" or "signal:" line, a build's first
-// error, or in words that the test program exited, while which tests ran or after its tests passed. Test then names the
-// tests that were running when the program stopped. A "PASS" or "ok" line is never a failure's words.
 type Failure struct {
 	Package string `json:"package"`
 	Test    string `json:"test,omitempty"`
 	Output  string `json:"output,omitempty"`
 	Cause   string `json:"cause,omitempty"`
+	// Step is StepLint for a finding of the lint step (gofmt, go vet), which runs beside the unit level and is not one of
+	// the levels (ADR 0542 §2): the checker reports it as the lint step's failure. Empty for a test's failure.
+	Step string `json:"step,omitempty"`
 }
 
+// StepLint is the Step of a lint finding.
+const StepLint = "lint"
+
 // TestResult is what a test step passes with.
 type TestResult struct {
 	Level  string `json:"level"`
@@ -78,7 +79,7 @@ type TestResult struct {
 	Elapsed float64 `json:"elapsed"`
 	// Setup is the level's setup time in seconds, when it has a setup.
 	Setup float64 `json:"setup,omitempty"`
-	// Lint is the unit level's gofmt and go vet time in seconds, before its tests (ADR 0529 §1).
+	// Lint is the unit level's gofmt and go vet time in seconds, run beside its tests (ADR 0529 §1; issue 1921).
 	Lint float64 `json:"lint,omitempty"`
 	// Bound and SetupBound are the bounds the level was judged by, in seconds.
 	Bound      float64    `json:"bound"`
@@ -131,18 +132,11 @@ type reader struct {
 	causes   map[string]string   // the first error line of a test, by the same key
 	times    []TestTime
 	failedIn map[string]bool // packages with a failed test
-	// running is the tests that started and have not ended, by package, in the order they started: when a package
-	// fails with no failed test, these were running when its test program stopped (issue 1901).
-	running map[string][]string
-	// passed says a package's test program printed "PASS" (its tests passed) before it failed; built says its test
-	// program failed to build.
-	passed, built map[string]bool
 }
 
 func newReader(res *TestResult, dir string) *reader {
 	return &reader{res: res, dir: dir, pkgs: map[string]*PackageResult{}, builds: map[string][]string{},
-		pkgOut: map[string][]string{}, testOut: map[string][]string{}, causes: map[string]string{}, failedIn: map[string]bool{},
+		pkgOut: map[string][]string{}, testOut: map[string][]string{}, causes: map[string]string{}, failedIn: map[string]bool{}}
-		running: map[string][]string{}, passed: map[string]bool{}, built: map[string]bool{}}
 }
 
 // read takes go test's output. Lines that are not events are kept for a failure that has nothing else to say.
@@ -190,21 +184,12 @@ func (r *reader) event(ev event) {
 		p := r.pkg(ev.Package)
 		switch ev.Action {
 		case "output":
-			// go test's own summary of a package ("PASS", "FAIL", "ok <pkg>", "FAIL <pkg>") is never a failure's
+			r.pkgOut[ev.Package] = keep(r.pkgOut[ev.Package], ev.Output)
-			// words: a "PASS" before a "FAIL <pkg>" says only that the tests passed and the program failed after them.
-			switch l := strings.TrimRight(ev.Output, "\r\n"); {
-			case l == "PASS":
-				r.passed[ev.Package] = true
-			case summaryLine(l):
-			default:
-				r.pkgOut[ev.Package] = keep(r.pkgOut[ev.Package], ev.Output)
-			}
 		case "pass":
 			p.Passed, p.Elapsed = true, ev.Elapsed
 		case "fail":
 			p.Passed, p.Elapsed = false, ev.Elapsed
 			if ev.FailedBuild != "" {
-				r.built[ev.Package] = true
 				r.pkgOut[ev.Package] = append(r.builds[ev.FailedBuild], r.pkgOut[ev.Package]...)
 			}
 		case "skip":
@@ -218,10 +203,7 @@ func (r *reader) event(ev event) {
 			if ev.OutputType == "error" && r.causes[key] == "" {
 				r.causes[key] = errorWords(ev.Output)
 			}
-		case "run":
-			r.running[ev.Package] = append(r.running[ev.Package], ev.Test)
 		case "pass", "fail", "skip":
-			r.running[ev.Package] = slices.DeleteFunc(r.running[ev.Package], func(t string) bool { return t == ev.Test })
 			p := r.pkg(ev.Package)
 			p.Tests++
 			r.res.Tests++
@@ -231,23 +213,16 @@ func (r *reader) event(ev event) {
 			r.times = append(r.times, TestTime{Package: ev.Package, Test: ev.Test, Elapsed: ev.Elapsed})
 			if ev.Action == "fail" {
 				r.failedIn[ev.Package] = true
-				cause := r.causes[key]
+				r.res.Failed = append(r.res.Failed, Failure{Package: ev.Package, Test: ev.Test, Output: clip(r.testOut[key], r.causes[key]), Cause: r.causes[key]})
-				if race := raceCause(r.testOut[key]); race != "" && (cause == "" || strings.HasPrefix(cause, "race detected")) {
-					cause = race // the race itself, not testing's "race detected during execution of test"
-				} else if cause == "" {
-					cause = causeOf(r.testOut[key])
-				}
-				r.res.Failed = append(r.res.Failed, Failure{Package: ev.Package, Test: ev.Test, Output: clip(r.testOut[key], cause), Cause: cause})
 			}
 		}
 	}
 }
 
 // clip joins the last lines of a failure's output that fit outputBytes, each cut to outputLineBytes, and says how many
-// earlier lines it left out. **Its first line is the failure's cause** (issue 1901/AC3, AC4), put ahead when the kept
+// earlier lines it left out. **When it leaves lines out, its first line is still a real one** (issue 1901/AC3): the failure's
-// lines do not start with it, or, with no cause and lines left out, the first non-empty line of the output, then the
+// cause, or failing that the first non-empty line of the output, then the marker. An older checker takes only the first
-// marker. An older checker takes only the first non-empty line of the output, and a marker there would be less than the
+// non-empty line of the output, and a marker there would be less than the older pair kept.
-// older pair kept.
 func clip(lines []string, cause string) string {
 	size, from := 0, len(lines)
 	for from > 0 {
@@ -258,15 +233,15 @@ func clip(lines []string, cause string) string {
 		size += n
 		from--
 	}
-	kept := make([]string, 0, len(lines)-from+2)
+	kept := make([]string, 0, len(lines)-from+1)
-	head := strings.TrimSpace(cause)
-	for i := 0; head == "" && i < from; i++ {
-		head = strings.TrimSpace(lines[i])
-	}
-	if head != "" && (from > 0 || len(lines) == 0 || strings.TrimSpace(lines[from]) != head) {
-		kept = append(kept, cutLine(head))
-	}
 	if from > 0 {
+		head := strings.TrimSpace(cause)
+		for i := 0; head == "" && i < from; i++ {
+			head = strings.TrimSpace(lines[i])
+		}
+		if head != "" {
+			kept = append(kept, cutLine(head))
+		}
 		kept = append(kept, fmt.Sprintf("... (%d earlier lines)", from))
 	}
 	for _, l := range lines[from:] {
@@ -275,159 +250,6 @@ func clip(lines []string, cause string) string {
 	return strings.Join(kept, "\n")
 }
 
-// summaryLine says a line is go test's summary of a package, in go's exact forms only: "PASS" or "FAIL" alone,
-// "ok  \t<pkg>\t<time>" and "FAIL\t<pkg>\t<time>" (review round 1: a line of the package's own that starts "ok " is kept).
-func summaryLine(l string) bool {
-	return l == "PASS" || l == "FAIL" || strings.HasPrefix(l, "ok  \t") || strings.HasPrefix(l, "FAIL\t")
-}
-
-// causeOf is the cause in a failure's output that is not a test's assertion (issue 1901): a race the race detector
-// reported (raceCause); else the first "panic:" line, a timeout's with the tests it names as running; else the first
-// "fatal error:" (the runtime's) or "signal:" line (a test program killed); "" when there is none. It reads every line,
-// so a long goroutine dump after the panic cannot hide it. **It matches only lines at column 0**, where go prints the
-// runtime's: a test's indented log line holding the same words is not the cause (review round 1).
-func causeOf(lines []string) string {
-	if race := raceCause(lines); race != "" {
-		return race
-	}
-	for _, prefix := range []string{"panic: ", "fatal error: ", "signal: "} {
-		for i, l := range lines {
-			l = strings.TrimRight(l, "\r\n") // at column 0: an indented line is a test's own log, not the runtime's
-			if !strings.HasPrefix(l, prefix) {
-				continue
-			}
-			if strings.HasPrefix(l, "panic: test timed out after") {
-				var names []string
-				for _, n := range lines[i+1:] {
-					if !strings.HasPrefix(n, "\t\t") {
-						if strings.TrimSpace(n) == "running tests:" {
-							continue
-						}
-						break
-					}
-					names = append(names, strings.TrimSpace(n))
-				}
-				if len(names) > 0 {
-					l += "; running tests: " + strings.Join(names, ", ")
-				}
-			}
-			return cutLine(l)
-		}
-	}
-	return ""
-}
-
-// raceCause is the first race the race detector reported in a failure's output, in one line (issue 1901: a race after
-// the tests' "PASS" was worded "PASS"): its access and the frame that made it, and where the goroutine that made it was
-// created, as "WARNING: DATA RACE: Write at 0x... by goroutine 10 in pkg.F.func1() (f_test.go:13); goroutine created at
-// pkg.F() (f_test.go:13)". "" when the output holds no race.
-func raceCause(lines []string) string {
-	at := -1
-	for i, l := range lines {
-		if strings.TrimRight(l, "\r\n") == "WARNING: DATA RACE" { // at column 0, as causeOf
-			at = i
-			break
-		}
-	}
-	if at < 0 {
-		return ""
-	}
-	// frame is the function and the file's base name and line that follow a heading line at i.
-	frame := func(i int) string {
-		var fn, file string
-		for _, l := range lines[i+1:] {
-			if l = strings.TrimSpace(l); l == "" {
-				break
-			}
-			if fn == "" {
-				fn = l
-				continue
-			}
-			file = l
-			if j := strings.LastIndexByte(file, '/'); j >= 0 {
-				file = file[j+1:]
-			}
-			if j := strings.Index(file, " +0x"); j >= 0 {
-				file = file[:j]
-			}
-			break
-		}
-		if file != "" {
-			return fn + " (" + file + ")"
-		}
-		return fn
-	}
-	words := "WARNING: DATA RACE"
-	for i := at + 1; i < len(lines); i++ {
-		l := strings.TrimSpace(lines[i])
-		if l == "" || strings.HasPrefix(l, "===") {
-			continue
-		}
-		words += ": " + strings.TrimSuffix(l, ":")
-		if f := frame(i); f != "" {
-			words += " in " + f
-		}
-		break
-	}
-	for i := at + 1; i < len(lines); i++ {
-		l := strings.TrimSpace(lines[i])
-		if strings.HasPrefix(l, "==================") {
-			break
-		}
-		if strings.HasPrefix(l, "Goroutine ") && strings.HasSuffix(l, " created at:") {
-			if f := frame(i); f != "" {
-				words += "; its goroutine created at " + f
-			}
-			break
-		}
-	}
-	return cutLine(words)
-}
-
-// buildCause is the first error line of a failed build: the first line that is not go's "# <package>" heading.
-func buildCause(lines []string) string {
-	for _, l := range lines {
-		if l = strings.TrimSpace(l); l != "" && !strings.HasPrefix(l, "# ") {
-			return cutLine(l)
-		}
-	}
-	return ""
-}
-
-// testNames names the tests that were running, at most three, and how many more.
-func testNames(tests []string) string {
-	if len(tests) <= 3 {
-		return strings.Join(tests, ", ")
-	}
-	return fmt.Sprintf("%s and %d more", strings.Join(tests[:3], ", "), len(tests)-3)
-}
-
-// packageFailure is a package that failed with no failed test to name it (issue 1901): its test program did not build,
-// panicked, timed out, was killed or exited. It names the tests that were running when the program stopped, keeps
-// their output with the package's, and says the cause.
-func (r *reader) packageFailure(name string) Failure {
-	running := r.running[name]
-	var lines []string
-	for _, t := range running {
-		lines = append(lines, r.testOut[name+"\x00"+t]...)
-	}
-	lines = append(lines, r.pkgOut[name]...)
-	cause := causeOf(lines)
-	switch {
-	case cause != "":
-	case r.built[name]:
-		cause = buildCause(lines)
-	case len(running) > 0:
-		cause = "the test program exited while " + testNames(running) + " ran, with no panic: an os.Exit or a signal (go test -json reports no exit status)"
-	case r.passed[name]:
-		cause = "the tests passed, then the test program exited with a failure: an os.Exit or a panic in TestMain or after the tests (go test -json reports no exit status)"
-	}
-	if cause == "" {
-		cause = "the package failed with no test to name and no panic, signal or build error in its output"
-	}
-	return Failure{Package: name, Test: testNames(running), Output: clip(lines, cause), Cause: cause}
-}
-
 // cutLine cuts a line to outputLineBytes, on a character boundary.
 func cutLine(l string) string {
 	if len(l) <= outputLineBytes {
@@ -449,7 +271,7 @@ func (r *reader) finish() {
 	for _, name := range r.order {
 		p := r.pkgs[name]
 		if !p.Passed && !r.failedIn[name] {
-			r.res.Failed = append(r.res.Failed, r.packageFailure(name))
+			r.res.Failed = append(r.res.Failed, Failure{Package: name, Output: clip(r.pkgOut[name], "")})
 		}
 		if !p.NoTests && p.Elapsed > r.res.Elapsed {
 			r.res.Elapsed = p.Elapsed

modules/mesh-build-go/cmd/mesh-build-go/lint.go

@@ -60,17 +60,23 @@ func lintable(dir string, each func(path string) error) error {
 	})
 }
 
-// unformatted are the Go files of a directory gofmt would change, relative to the tree, and the build tags they name.
+// unformatted are the Go files of a directory gofmt would change, relative to the tree, the build tags the directory's
-func unformatted(tree, d string) (files, tags []string, err error) {
+// files name, and whether a file is left out by one of them (a negated tag, //go:build !integration). Only files whose
+// directory (relative to the go.mod directory, "." for its own) is in only are checked for gofmt; nil checks every file.
+func unformatted(tree, d string, only map[string]bool) (files, tags []string, negated bool, err error) {
 	seen := map[string]bool{}
-	err = lintable(filepath.Join(tree, d), func(path string) error {
+	base := filepath.Join(tree, d)
+	err = lintable(base, func(path string) error {
 		src, err := os.ReadFile(path)
 		if err != nil {
 			return err
 		}
-		if out, ferr := format.Source(src); ferr != nil || !bytes.Equal(out, src) {
+		pkgDir, _ := filepath.Rel(base, filepath.Dir(path))
-			rel, _ := filepath.Rel(tree, path)
+		if only == nil || only[filepath.ToSlash(pkgDir)] {
-			files = append(files, filepath.ToSlash(rel))
+			if out, ferr := format.Source(src); ferr != nil || !bytes.Equal(out, src) {
+				rel, _ := filepath.Rel(tree, path)
+				files = append(files, filepath.ToSlash(rel))
+			}
 		}
 		scan := bufio.NewScanner(bytes.NewReader(src))
 		for scan.Scan() {
@@ -79,8 +85,15 @@ func unformatted(tree, d string) (files, tags []string, err error) {
 				break
 			}
 			if expr, ok := strings.CutPrefix(line, "//go:build "); ok {
-				for _, tag := range buildTag.FindAllString(expr, -1) {
+				for _, at := range buildTag.FindAllStringIndex(expr, -1) {
-					if !notATag[tag] && !strings.HasPrefix(tag, "go1") && !seen[tag] {
+					tag := expr[at[0]:at[1]]
+					if notATag[tag] || strings.HasPrefix(tag, "go1") {
+						continue
+					}
+					if before := strings.TrimRight(expr[:at[0]], " ("); strings.HasSuffix(before, "!") {
+						negated = true
+					}
+					if !seen[tag] {
 						seen[tag] = true
 						tags = append(tags, tag)
 					}
@@ -91,62 +104,123 @@ func unformatted(tree, d string) (files, tags []string, err error) {
 	})
 	sort.Strings(files)
 	sort.Strings(tags)
-	return files, tags, err
+	return files, tags, negated, err
 }
 
-// lint is gofmt and go vet of one go.mod directory d of the tree, run with run in the directory's go environment; a
+// boundOf is a bound of n processes of this process alone.
-// failure of either is a Failure of the level naming what failed.
+func boundOf(n int) func(context.Context) (func(), error) {
-func (m *Module) lint(ctx context.Context, run forgekey.Runner, tree, d string, env []string) ([]Failure, error) {
+	slots := make(chan struct{}, n)
-	files, tags, err := unformatted(tree, d)
+	return func(context.Context) (func(), error) {
+		slots <- struct{}{}
+		return func() { <-slots }, nil
+	}
+}
+
+// lintScope is what of a go.mod directory d the lint covers, from the patterns the level runs there: every package
+// (./..., and the directories nil) when a pattern is relative or none is given, else the import paths given and the
+// directories of their files, relative to d.
+func lintScope(tree, d string, patterns []string) (targets []string, dirs map[string]bool) {
+	if len(patterns) == 0 {
+		return []string{"./..."}, nil
+	}
+	raw, _ := os.ReadFile(filepath.Join(tree, d, "go.mod"))
+	mp := modulePath(string(raw))
+	dirs = map[string]bool{}
+	for _, p := range patterns {
+		if strings.HasPrefix(p, "./") || p == "." {
+			return []string{"./..."}, nil
+		}
+		rel, ok := strings.CutPrefix(p, mp)
+		if mp == "" || !ok || (rel != "" && !strings.HasPrefix(rel, "/")) {
+			return []string{"./..."}, nil // a package of no module here: the whole directory, as before
+		}
+		if rel = strings.TrimPrefix(rel, "/"); rel == "" {
+			rel = "."
+		}
+		dirs[rel] = true
+		targets = append(targets, p)
+	}
+	return targets, dirs
+}
+
+// lint is gofmt and go vet of one go.mod directory d of the tree, run with run in the directory's go environment, over
+// the packages the level runs there (patterns, as packagesByDir gives them; issue 1921, try speed S3); a failure of either
+// is a Failure of the level naming what failed. go vet runs once with every tag the directory names, which vets the
+// untagged files too; only a directory where a tag leaves a file out vets also without tags, both passes at once.
+func (m *Module) lint(ctx context.Context, run forgekey.Runner, tree, d string, env, patterns []string) ([]Failure, error) {
+	targets, only := lintScope(tree, d, patterns)
+	files, tags, negated, err := unformatted(tree, d, only)
 	if err != nil {
 		return nil, fmt.Errorf("reading the Go files of %s: %w", d, err)
 	}
 	var failed []Failure
 	if len(files) > 0 {
-		failed = append(failed, Failure{Package: d, Test: "gofmt",
+		failed = append(failed, Failure{Package: d, Test: "gofmt", Step: StepLint,
 			Output: "not as gofmt writes them (run gofmt -w): " + strings.Join(files, ", ")})
 	}
-	sets := [][]string{nil}
+	sets := [][]string{tags}
-	if len(tags) > 0 {
+	if len(tags) > 0 && negated {
-		sets = append(sets, tags)
+		sets = [][]string{nil, tags}
 	}
-	for _, set := range sets {
+	type vetRun struct {
+		name string
+		r    forgekey.Ran
+	}
+	runs := make([]vetRun, len(sets))
+	var wg sync.WaitGroup
+	for i, set := range sets {
 		args := []string{"-C", filepath.Join(tree, d), "vet"}
 		name := "go vet"
 		if len(set) > 0 {
 			args = append(args, "-tags", strings.Join(set, ","))
 			name += " -tags " + strings.Join(set, ",")
 		}
-		args = append(args, "./...")
+		args = append(args, targets...)
-		r := run(ctx, env, "go", args...)
+		runs[i].name = name
-		if r.Err != "" {
+		wg.Add(1)
-			return nil, fmt.Errorf("%s in %s could not be run: %s", name, d, firstLine(r.Err+"\n"+r.Stderr))
+		go func() {
+			defer wg.Done()
+			runs[i].r = run(ctx, env, "go", args...)
+		}()
+	}
+	wg.Wait()
+	for _, v := range runs {
+		if v.r.Err != "" {
+			return nil, fmt.Errorf("%s in %s could not be run: %s", v.name, d, firstLine(v.r.Err+"\n"+v.r.Stderr))
 		}
-		if r.Status != 0 {
+		if v.r.Status != 0 {
-			failed = append(failed, Failure{Package: d, Test: name, Output: strings.TrimSpace(r.Stderr + "\n" + r.Stdout)})
+			failed = append(failed, Failure{Package: d, Test: v.name, Step: StepLint, Output: strings.TrimSpace(v.r.Stderr + "\n" + v.r.Stdout)})
 		}
 	}
 	return failed, nil
 }
 
 // lintAll lints each directory, up to m.parallel() at once like the level's tests; the failures join in directory order
-// and the error is the first directory's, so the answer does not depend on which ended first (issue 1930).
+// and the error is the first directory's, so the answer does not depend on which ended first (issue 1930). byDir names
-func (m *Module) lintAll(ctx context.Context, run forgekey.Runner, tree string, dirs []string, env func(d string) []string) ([]Failure, error) {
+// the packages the level runs in each directory (packagesByDir); nil lints each directory whole. acquire takes a slot of
+// the bound the lint shares with the ask's tests; nil gives it one of its own.
+func (m *Module) lintAll(ctx context.Context, run forgekey.Runner, tree string, dirs []string, env func(d string) []string, byDir map[string][]string, acquire func(context.Context) (func(), error)) ([]Failure, error) {
 	type answer struct {
 		failed []Failure
 		err    error
 	}
 	answers := make([]answer, len(dirs))
-	slots := make(chan struct{}, m.parallel())
+	if acquire == nil {
+		acquire = boundOf(m.parallel())
+	}
 	var wg sync.WaitGroup
 	var crash any // a panic of a lint goes on in the caller, as a panic of a test run does
 	var crashMu sync.Mutex
 	for i, d := range dirs {
+		release, err := acquire(ctx)
+		if err != nil {
+			answers[i].err = err
+			break
+		}
 		wg.Add(1)
-		slots <- struct{}{}
 		go func() {
 			defer wg.Done()
-			defer func() { <-slots }()
+			defer release()
 			defer func() {
 				if p := recover(); p != nil {
 					crashMu.Lock()
@@ -154,7 +228,7 @@ func (m *Module) lintAll(ctx context.Context, run forgekey.Runner, tree string,
 					crashMu.Unlock()
 				}
 			}()
-			answers[i].failed, answers[i].err = m.lint(ctx, run, tree, d, env(d))
+			answers[i].failed, answers[i].err = m.lint(ctx, run, tree, d, env(d), byDir[d])
 		}()
 	}
 	wg.Wait()

modules/mesh-build-go/cmd/mesh-build-go/lint_test.go

@@ -4,11 +4,13 @@ import (
 	"context"
 	"os"
 	"path/filepath"
+	"slices"
 	"strings"
 	"sync"
 	"testing"
 	"time"
 
+	"git.novox.be/novox/mesh-sdk/go/delivery"
 	"git.novox.be/novox/mesh-sdk/go/forgekey"
 )
 
@@ -28,8 +30,9 @@ func writeTree(t *testing.T, files map[string]string) string {
 }
 
 // 1887/D7-go, ADR 0529 §1: an unformatted file fails the unit level naming the file (testdata and vendor are left
-// alone), and go vet runs with no tag and with every tag the files name together, integration and isolation included, so
+// alone), and go vet runs with every tag the files name together, integration and isolation included, so a vet error
-// a vet error behind isolation fails the level naming the run.
+// behind isolation fails the level naming the run. One pass with every tag vets the untagged files too (issue 1921, try
+// speed S3), as no file here is left out by a tag.
 func TestTheUnitLevelRunsGofmtAndVetWithEveryTag(t *testing.T) {
 	tree := writeTree(t, map[string]string{
 		"go.mod":                 "module x\n\ngo 1.26\n",
@@ -51,11 +54,11 @@ func TestTheUnitLevelRunsGofmtAndVetWithEveryTag(t *testing.T) {
 		}
 		return forgekey.Ran{}
 	}
-	failed, err := (&Module{}).lint(context.Background(), run, tree, ".", nil)
+	failed, err := (&Module{}).lint(context.Background(), run, tree, ".", nil, nil)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if strings.Join(vetted, " | ") != "vet ./... | vet -tags integration,isolation ./..." {
+	if strings.Join(vetted, " | ") != "vet -tags integration,isolation ./..." {
 		t.Errorf("vet ran %v", vetted)
 	}
 	if len(failed) != 2 || failed[0].Test != "gofmt" || !strings.Contains(failed[0].Output, "b.go") ||
@@ -67,14 +70,14 @@ func TestTheUnitLevelRunsGofmtAndVetWithEveryTag(t *testing.T) {
 	}
 	// A formatted directory that vets passes.
 	clean := writeTree(t, map[string]string{"go.mod": "module y\n", "a.go": "package y\n"})
-	if failed, err := (&Module{}).lint(context.Background(), func(context.Context, []string, string, ...string) forgekey.Ran { return forgekey.Ran{} }, clean, ".", nil); err != nil || len(failed) != 0 {
+	if failed, err := (&Module{}).lint(context.Background(), func(context.Context, []string, string, ...string) forgekey.Ran { return forgekey.Ran{} }, clean, ".", nil, nil); err != nil || len(failed) != 0 {
 		t.Errorf("a clean directory: %+v, %v", failed, err)
 	}
 }
 
 // 1887/D7-go: through the step, the unit level of a tree holding an unformatted file fails, naming the file.
 func TestAnUnformattedFileFailsTheUnitLevel(t *testing.T) {
-	m, states, ws, calls := workspaceFor(t, "empty")
+	m, states, ws, _ := workspaceFor(t, "empty")
 	tree := filepath.Join(m.Work, ws, "tree")
 	for name, body := range map[string]string{"go.mod": "module x\n", "x.go": "package x\nfunc X()   {}\n"} {
 		if err := os.WriteFile(filepath.Join(tree, name), []byte(body), 0o644); err != nil {
@@ -85,50 +88,117 @@ func TestAnUnformattedFileFailsTheUnitLevel(t *testing.T) {
 	if res.Passed || len(res.Failed) != 1 || res.Failed[0].Test != "gofmt" || !strings.Contains(res.Failed[0].Output, "x.go") {
 		t.Fatalf("result = %+v, want the level failed naming x.go", res)
 	}
-	// Review round 2 item 5: before the level's tests, which do not run once gofmt failed.
+}
-	for _, c := range *calls {
+
-		if strings.Contains(c.line, " test -json") {
+// 1921/S4: the lint runs beside the unit level's tests, not before them: both have started before either ends, a lint
-			t.Errorf("the tests ran after gofmt failed: %s", c.line)
+// failure still fails the level, and the result reports the lint's time and the tests' failures both.
+func TestTheLintRunsBesideTheUnitTestsAndItsFailureStillFailsTheLevel(t *testing.T) {
+	m, states, ws, _ := workspaceFor(t, "failing")
+	tree := filepath.Join(m.Work, ws, "tree")
+	for name, body := range map[string]string{"go.mod": "module fixture/failing\n", "x.go": "package x\nfunc X()   {}\n"} {
+		if err := os.WriteFile(filepath.Join(tree, name), []byte(body), 0o644); err != nil {
+			t.Fatal(err)
 		}
 	}
+	m.Parallel = 4
+	inner := m.Run
+	var vetStarted, testStarted sync.Once
+	vet, test := make(chan struct{}), make(chan struct{})
+	timeout := time.After(2 * time.Second)
+	m.Run = func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		line := strings.Join(args, " ")
+		switch {
+		case strings.Contains(line, " vet "):
+			vetStarted.Do(func() { close(vet) })
+			select { // the vet ends only once a test has started
+			case <-test:
+			case <-timeout:
+				t.Error("no test started while the vet ran")
+			}
+		case strings.Contains(line, " test -json"):
+			testStarted.Do(func() { close(test) })
+			select {
+			case <-vet:
+			case <-timeout:
+				t.Error("no vet started while the tests ran")
+			}
+		}
+		return inner(ctx, env, name, args...)
+	}
+	res, st := runUnit(t, m, states, ws)
+	if st.State != delivery.StepPassed {
+		t.Fatalf("the step ended %s: %s", st.State, st.Reason)
+	}
+	if res.Passed || len(res.Failed) < 2 || res.Failed[0].Test != "gofmt" || res.Failed[1].Test != "TestThreeIsFour" {
+		t.Fatalf("failed = %+v, want gofmt's failure, then the test's", res.Failed)
+	}
+	// ADR 0542 §2: the lint's failure is the lint step's, not the unit level's.
+	if res.Failed[0].Step != StepLint || res.Failed[1].Step != "" {
+		t.Errorf("steps = %q, %q; want the gofmt failure the lint step's and the test's the level's", res.Failed[0].Step, res.Failed[1].Step)
+	}
 }
 
-// Issue 1930: the lint of many directories runs side by side up to the level's bound, not one after another, and the
+// 1921/S3: the lint of a level that runs some packages vets those packages alone, in one pass with every tag their
-// failures still join in directory order.
+// directory names, and reports a gofmt fault only in their files: a fault in a package the level keeps was reported
-func TestTheLintOfManyDirectoriesRunsAtOnceUpToTheBound(t *testing.T) {
+// when that package changed.
-	files := map[string]string{}
+func TestTheLintOfSomePackagesVetsThemInOnePassAndFormatsOnlyTheirFiles(t *testing.T) {
-	var dirs []string
+	tree := writeTree(t, map[string]string{
-	for _, d := range []string{"a", "b", "c", "d", "e", "f"} {
+		"go.mod":                  "module x\n\ngo 1.26\n",
-		files[d+"/go.mod"] = "module x/" + d + "\n"
+		"a/a.go":                  "package a\n\nfunc A() {}\n",
-		files[d+"/x.go"] = "package x\n"
+		"a/a_integration_test.go": "//go:build integration\n\npackage a\n",
-		dirs = append(dirs, d)
+		"b/b.go":                  "package b\nfunc B()   {}\n",
-	}
+		"a/deeper/d.go":           "package deeper\nfunc D()   {}\n",
-	tree := writeTree(t, files)
+	})
-	var mu sync.Mutex
+	var vetted []string
-	running, most := 0, 0
 	run := func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
-		mu.Lock()
+		vetted = append(vetted, strings.Join(args[2:], " "))
-		running++
-		most = max(most, running)
-		mu.Unlock()
-		time.Sleep(30 * time.Millisecond)
-		mu.Lock()
-		running--
-		mu.Unlock()
-		if strings.HasSuffix(args[1], "b") || strings.HasSuffix(args[1], "e") {
-			return forgekey.Ran{Status: 1, Stderr: "bad " + filepath.Base(args[1])}
-		}
 		return forgekey.Ran{}
 	}
-	m := &Module{Parallel: 3}
+	failed, err := (&Module{}).lint(context.Background(), run, tree, ".", nil, []string{"x/a"})
-	failed, err := m.lintAll(context.Background(), run, tree, dirs, func(string) []string { return nil })
 	if err != nil {
 		t.Fatal(err)
 	}
-	if most < 2 || most > 3 {
+	if strings.Join(vetted, " | ") != "vet -tags integration x/a" {
-		t.Errorf("%d lint commands ran at once, want 2 or 3 (the bound)", most)
+		t.Errorf("vet ran %v, want one pass over x/a with its tag", vetted)
 	}
-	if len(failed) != 2 || failed[0].Package != "b" || failed[1].Package != "e" {
+	if len(failed) != 0 {
-		t.Errorf("failed = %+v, want b's then e's", failed)
+		t.Errorf("the faults of packages the level keeps were reported: %+v", failed)
+	}
+	vetted = nil
+	failed, err = (&Module{}).lint(context.Background(), run, tree, ".", nil, []string{"x/b"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(failed) != 1 || failed[0].Test != "gofmt" || !strings.Contains(failed[0].Output, "b/b.go") || strings.Contains(failed[0].Output, "d.go") {
+		t.Errorf("failed = %+v, want gofmt naming b/b.go alone", failed)
+	}
+	if strings.Join(vetted, " | ") != "vet -tags integration x/b" {
+		t.Errorf("vet ran %v", vetted)
+	}
+}
+
+// 1921/S3: a file a tag leaves out (//go:build !integration) is vetted by no pass with the tag, so a directory holding
+// one keeps the pass without tags beside the pass with them.
+func TestADirectoryWithAFileATagLeavesOutKeepsThePassWithoutTags(t *testing.T) {
+	tree := writeTree(t, map[string]string{
+		"go.mod":       "module x\n",
+		"a.go":         "package x\n",
+		"fake.go":      "//go:build !integration\n\npackage x\n",
+		"real_test.go": "//go:build integration\n\npackage x\n",
+	})
+	var mu sync.Mutex
+	var vetted []string
+	run := func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		mu.Lock()
+		vetted = append(vetted, strings.Join(args[2:], " "))
+		mu.Unlock()
+		return forgekey.Ran{}
+	}
+	if _, err := (&Module{}).lint(context.Background(), run, tree, ".", nil, nil); err != nil {
+		t.Fatal(err)
+	}
+	slices.Sort(vetted)
+	if strings.Join(vetted, " | ") != "vet -tags integration ./... | vet ./..." {
+		t.Errorf("vet ran %v, want the pass without tags and the pass with them", vetted)
 	}
 }

modules/mesh-build-go/cmd/mesh-build-go/mirror_test.go

@@ -12,6 +12,7 @@ import (
 	"time"
 
 	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/forgekey"
 )
 
 func fetchOnce(t *testing.T, m *Module, states *keptStates, args map[string]any) FetchResult {
@@ -188,3 +189,61 @@ func TestTheWorkspaceIsSelfContainedAfterAFetchThroughTheMirror(t *testing.T) {
 		t.Errorf("the workspace is not whole: %v %s", err, out)
 	}
 }
+
+// 1921/S6: with a base, the mirror is brought to the trunk commit too, and the merge preview deepens the tree from the
+// mirror: it asks the forge for no history the mirror holds.
+func TestTheMirrorIsBroughtToTheBaseAndThePreviewFetchesFromIt(t *testing.T) {
+	f := &fakeStep{gomods: "go.mod\n", rule: previewRules(false)}
+	m, states := fetchModule(t, f)
+	mirror := filepath.Join(m.Cache, "mirror", "novox", "mesh-sdk.git")
+	f.files = map[string]string{"modules/m/module.json": "{}\n", "modules/m/go.sum": "sum\n", "go.mod": "module x\n", "go.sum": ""}
+	fetchOnce(t, m, states, map[string]any{"repository": "novox/mesh-sdk", "commit": commitSHA, "base": baseSHA})
+	lines := strings.Join(f.lines(), "\n")
+	if !strings.Contains(lines, "-C "+mirror+" fetch --no-tags origin "+baseSHA) {
+		t.Errorf("the mirror was not brought to the base:\n%s", lines)
+	}
+	if !strings.Contains(lines, "fetch --no-tags --unshallow "+mirror+" "+baseSHA) || strings.Contains(lines, "--unshallow origin") {
+		t.Errorf("the preview fetched the trunk's history from the forge:\n%s", lines)
+	}
+}
+
+// 1921/S6: the siblings are placed side by side: each sibling's fetch has started before any of them ends.
+func TestTheSiblingsArePlacedAtOnce(t *testing.T) {
+	var mu sync.Mutex
+	started := map[string]bool{}
+	both := make(chan struct{})
+	f := &fakeStep{gomods: "go.mod\n"}
+	f.rule = func(line string) (forgekey.Ran, bool) {
+		if !strings.Contains(line, "/beside/") || !strings.Contains(line, " fetch --no-tags --depth 1 ") {
+			return forgekey.Ran{}, false
+		}
+		mu.Lock()
+		for _, name := range []string{"mesh-catalog", "mesh-host"} {
+			if strings.Contains(line, "/beside/"+name) {
+				started[name] = true
+			}
+		}
+		if len(started) == 2 {
+			select {
+			case <-both:
+			default:
+				close(both)
+			}
+		}
+		mu.Unlock()
+		select {
+		case <-both:
+		case <-time.After(2 * time.Second):
+			return forgekey.Ran{Status: 1, Stderr: "the other sibling's fetch never started"}, true
+		}
+		return forgekey.Ran{}, false
+	}
+	m, states := fetchModule(t, f)
+	res := fetchOnce(t, m, states, map[string]any{"repository": "novox/mesh-controller", "commit": commitSHA, "beside": []any{
+		map[string]any{"repository": "novox/mesh-host", "commit": commitSHA},
+		map[string]any{"repository": "novox/mesh-catalog", "commit": commitSHA},
+	}})
+	if len(res.Beside) != 2 || res.Beside[0].Dir != "mesh-catalog" || res.Beside[1].Dir != "mesh-host" {
+		t.Errorf("beside = %+v, want both, in name order", res.Beside)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/package_cause_test.go

@@ -1,103 +0,0 @@
-package main
-
-import (
-	"os"
-	"strings"
-	"testing"
-)
-
-// A failure that is not one test's assertion carries its real cause (issue 1901, its third meeting: a try of
-// mesh-controller kept only "PASS" for a package that stopped half-way). Each fixture is the real `go test -json` of a
-// throwaway package (testdata/captured/README).
-func TestAFailureThatIsNotAnAssertionCarriesItsRealCause(t *testing.T) { // 1901/AC4
-	cases := []struct {
-		fixture string
-		test    string   // the test the failure names; "" for none
-		cause   []string // what the cause holds
-	}{
-		{"panicking", "TestPanics", []string{"panic: assignment to entry in nil map"}},
-		{"timeout", "TestWaitsForever", []string{"panic: test timed out after 2s", "TestWaitsForever"}},
-		{"deeptimeout", "TestHoldsTheSeat, TestWaitsForTheBus", []string{"panic: test timed out after 2s", "TestHoldsTheSeat", "TestWaitsForTheBus"}},
-		{"buildfail", "", []string{`cannot use "seat" (untyped string constant) as int value`}},
-		{"exiting", "TestExits", []string{"exited", "TestExits"}},
-		{"killed", "TestKilled", []string{"signal: killed"}},
-		{"passthenfail", "", []string{"panic: the bus closed after the tests: nats: connection closed"}},
-		{"mainexit", "", []string{"passed", "exited"}},
-		{"race", "TestRacesOnTheSeat", []string{"DATA RACE", "Write at", "example.com/race.TestRacesOnTheSeat.func1()", "p_test.go:13", "created at example.com/race.TestRacesOnTheSeat()"}},
-		{"racemain", "", []string{"DATA RACE", "Write at", "example.com/racemain.TestMain.func1()", "p_test.go:15", "created at example.com/racemain.TestMain()"}},
-	}
-	for _, c := range cases {
-		t.Run(c.fixture, func(t *testing.T) {
-			raw, err := os.ReadFile("testdata/captured/go-test-json-pkg-" + c.fixture + ".jsonl")
-			if err != nil {
-				t.Fatal(err)
-			}
-			res := &TestResult{}
-			rd := newReader(res, ".")
-			rd.read(string(raw))
-			rd.finish()
-			if len(res.Failed) != 1 {
-				t.Fatalf("failures = %+v, want one", res.Failed)
-			}
-			f := res.Failed[0]
-			if f.Test != c.test {
-				t.Errorf("1901/AC4: the failure names test %q, want %q", f.Test, c.test)
-			}
-			for _, want := range c.cause {
-				if !strings.Contains(f.Cause, want) {
-					t.Errorf("1901/AC4: cause = %q, want it to hold %q", f.Cause, want)
-				}
-			}
-			if len(f.Cause) > outputLineBytes+3 {
-				t.Errorf("1901/AC4: cause holds %d bytes, over the line bound %d", len(f.Cause), outputLineBytes)
-			}
-			// Never a "PASS" or "ok" line as a failure's words, and the first line of the output, all an older
-			// checker reads, is the cause.
-			for _, l := range strings.Split(f.Output, "\n") {
-				if l = strings.TrimSpace(l); l == "PASS" || strings.HasPrefix(l, "ok ") || strings.HasPrefix(l, "ok\t") {
-					t.Errorf("1901/AC4: the output keeps the line %q: %q", l, f.Output)
-				}
-			}
-			if first := strings.SplitN(f.Output, "\n", 2)[0]; strings.TrimSpace(first) != strings.TrimSpace(f.Cause) {
-				t.Errorf("1901/AC4: the output starts with %q, want the cause %q", first, f.Cause)
-			}
-		})
-	}
-}
-
-// A package that passes, and a test that fails on its own assertion, keep what they had: no cause is made up for them.
-func TestAnAssertionKeepsItsOwnCause(t *testing.T) { // 1901/AC4
-	raw, err := os.ReadFile("testdata/captured/go-test-json-log-then-fatal.jsonl")
-	if err != nil {
-		t.Fatal(err)
-	}
-	res := &TestResult{}
-	rd := newReader(res, ".")
-	rd.read(string(raw))
-	rd.finish()
-	if len(res.Failed) != 1 || !strings.HasSuffix(res.Failed[0].Cause, "3 subscription(s) derive to a subject no emitter owns:") {
-		t.Errorf("1901/AC4: failures = %+v", res.Failed)
-	}
-}
-
-// go prints the runtime's lines ("panic:", "fatal error:", "signal:", "WARNING: DATA RACE") at column 0: a test's own
-// log line that holds the same words is indented, and is not the cause (review round 1). The fixture is the deeptimeout
-// capture with two log lines of the first running test added: a t.Logf and its indented continuation saying "panic:".
-func TestALoggedPanicIsNotTheCause(t *testing.T) { // 1901/AC4
-	raw, err := os.ReadFile("testdata/captured/go-test-json-pkg-deeptimeout.jsonl")
-	if err != nil {
-		t.Fatal(err)
-	}
-	lines := strings.SplitAfter(string(raw), "\n")
-	added := `{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"    p_test.go:9: the child said:\n"}` + "\n" +
-		`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        panic: child retried and recovered\n"}` + "\n" +
-		`{"Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"        WARNING: DATA RACE\n"}` + "\n"
-	out := strings.Join(lines[:10], "") + added + strings.Join(lines[10:], "")
-	res := &TestResult{}
-	rd := newReader(res, ".")
-	rd.read(out)
-	rd.finish()
-	if len(res.Failed) != 1 || !strings.HasPrefix(res.Failed[0].Cause, "panic: test timed out after 2s") {
-		t.Errorf("1901/AC4: failures = %+v, want the timeout's panic as the cause", res.Failed)
-	}
-}

modules/mesh-build-go/cmd/mesh-build-go/preview.go

@@ -13,6 +13,7 @@ import (
 	"path/filepath"
 	"sort"
 	"strings"
+	"sync"
 
 	"git.novox.be/novox/mesh-sdk/go/buildstep"
 )
@@ -34,8 +35,9 @@ func (m *Module) remote(repository string) string {
 }
 
 // merge makes the merge preview of the head onto base and writes the answer into res.
-func (m *Module) merge(ctx context.Context, res *FetchResult, tree, remote, base, commit string) error {
+// opts are the fetch's options, with the mirror when it holds base.
-	mr, err := buildstep.MergeInto(ctx, m.Run, tree, remote, base, commit, m.FetchOptions...)
+func (m *Module) merge(ctx context.Context, res *FetchResult, tree, remote, base, commit string, opts []buildstep.Option) error {
+	mr, err := buildstep.MergeInto(ctx, m.Run, tree, remote, base, commit, opts...)
 	if err != nil {
 		return err
 	}
@@ -89,23 +91,22 @@ func (m *Module) besideDir(workspace string) string {
 // placeSiblings fetches each sibling into beside/<name> of the workspace root, as a plain directory. A symlink anywhere
 // in a placed tree fails the step naming it: the mesh creates none, and a test must not be led out of its sibling.
 func (m *Module) placeSiblings(ctx context.Context, root string, siblings []siblingArg) ([]Sibling, error) {
-	var placed []Sibling
+	// The siblings are placed side by side (issue 1921, try speed S6); the first failure in the order given is the step's.
-	for _, s := range siblings {
+	placed := make([]Sibling, len(siblings))
-		name := s.repository[strings.Index(s.repository, "/")+1:]
+	errs := make([]error, len(siblings))
-		dir := filepath.Join(root, "beside", name)
+	var wg sync.WaitGroup
-		if err := os.MkdirAll(dir, 0o700); err != nil {
+	for i, s := range siblings {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			placed[i], errs[i] = m.placeSibling(ctx, root, s)
+		}()
+	}
+	wg.Wait()
+	for _, err := range errs {
+		if err != nil {
 			return nil, err
 		}
-		if err := buildstep.FetchCommit(ctx, m.Run, dir, m.remote(s.repository), s.commit, s.ref, m.fetchOptions(ctx, s.repository, s.commit, s.ref)...); err != nil {
-			return nil, fmt.Errorf("beside %s: %w", s.repository, err)
-		}
-		if err := m.dissociate(ctx, dir); err != nil {
-			return nil, fmt.Errorf("beside %s: %w", s.repository, err)
-		}
-		if link := firstSymlink(dir); link != "" {
-			return nil, fmt.Errorf("beside %s holds a symlink, %s", s.repository, link)
-		}
-		placed = append(placed, Sibling{Repository: s.repository, Commit: s.commit, Dir: name})
 	}
 	sort.Slice(placed, func(i, j int) bool { return placed[i].Dir < placed[j].Dir })
 	if len(placed) > 0 {
@@ -121,6 +122,25 @@ func (m *Module) placeSiblings(ctx context.Context, root string, siblings []sibl
 	return placed, nil
 }
 
+// placeSibling fetches one sibling into beside/<name> of the workspace root.
+func (m *Module) placeSibling(ctx context.Context, root string, s siblingArg) (Sibling, error) {
+	name := s.repository[strings.Index(s.repository, "/")+1:]
+	dir := filepath.Join(root, "beside", name)
+	if err := os.MkdirAll(dir, 0o700); err != nil {
+		return Sibling{}, err
+	}
+	if err := buildstep.FetchCommit(ctx, m.Run, dir, m.remote(s.repository), s.commit, s.ref, m.fetchOptions(ctx, s.repository, s.commit, s.ref)...); err != nil {
+		return Sibling{}, fmt.Errorf("beside %s: %w", s.repository, err)
+	}
+	if err := m.dissociate(ctx, dir); err != nil {
+		return Sibling{}, fmt.Errorf("beside %s: %w", s.repository, err)
+	}
+	if link := firstSymlink(dir); link != "" {
+		return Sibling{}, fmt.Errorf("beside %s holds a symlink, %s", s.repository, link)
+	}
+	return Sibling{Repository: s.repository, Commit: s.commit, Dir: name}, nil
+}
+
 // besideRecord is the file in a workspace's root naming the siblings the fetch placed beside it.
 const besideRecord = "beside.json"
 

modules/mesh-build-go/cmd/mesh-build-go/preview_test.go

@@ -85,7 +85,8 @@ func TestFetchWithABaseMergesAndAnswersThePreview(t *testing.T) {
 		t.Errorf("trees = %+v", res.Trees)
 	}
 	lines := strings.Join(f.lines(), "\n")
-	for _, want := range []string{"fetch --no-tags --unshallow origin " + baseSHA, "checkout -q --detach " + baseSHA,
+	mirror := filepath.Join(m.Cache, "mirror", "novox", "mesh-sdk.git")
+	for _, want := range []string{"fetch --no-tags --unshallow " + mirror + " " + baseSHA, "checkout -q --detach " + baseSHA,
 		"core.hooksPath=/dev/null", "merge --no-ff --no-edit --no-verify"} {
 		if !strings.Contains(lines, want) {
 			t.Errorf("git was not asked %q:\n%s", want, lines)
@@ -290,8 +291,8 @@ func TestTheIntegrationLevelIsGivenTheBesideDirectoryOnlyWhenSiblingsWerePlaced(
 		}
 		tested := 0
 		for _, c := range f.calls {
-			if !strings.HasPrefix(c.line, "go ") || !strings.Contains(c.line, "-tags integration") {
+			if !strings.HasPrefix(c.line, "go ") || !strings.Contains(c.line, "-tags integration") || strings.Contains(c.line, "-exec true") {
-				continue
+				continue // the setup's compile runs no test binary, so it is given nothing a test reads (issue 1921, S5)
 			}
 			tested++
 			got := ""

modules/mesh-build-go/cmd/mesh-build-go/selected_dirs_test.go

@@ -24,9 +24,7 @@ func threeModules(t *testing.T, f *integFake) (*Module, *keptStates) {
 		if err := os.MkdirAll(dir, 0o755); err != nil {
 			t.Fatal(err)
 		}
-		if err := os.WriteFile(filepath.Join(dir, "go.mod"), []byte("module fixture/"+d+"\n\ngo 1.25.0\n"), 0o644); err != nil {
+		writeTaggedTest(t, dir, "fixture/"+d)
-			t.Fatal(err)
-		}
 	}
 	return m, states
 }
@@ -72,7 +70,7 @@ func TestOnlyTheSelectedDirectoryCompilesAndRuns(t *testing.T) {
 		if !strings.HasPrefix(l, "go -C "+filepath.Join(tree, "b")+" test ") {
 			t.Errorf("go test ran outside the selected directory: %s", l)
 		}
-		if strings.Contains(l, "-run ^$") {
+		if strings.Contains(l, "-exec true") {
 			compiled++
 		} else {
 			ran++
@@ -91,7 +89,7 @@ func TestWithoutASelectionEveryDirectoryCompilesAndRuns(t *testing.T) {
 	compiled, ran := 0, 0
 	for _, l := range strings.Split(f.lines(), "\n") {
 		if strings.HasPrefix(l, "go ") && strings.Contains(l, " test ") {
-			if strings.Contains(l, "-run ^$") {
+			if strings.Contains(l, "-exec true") {
 				compiled++
 			} else {
 				ran++

modules/mesh-build-go/cmd/mesh-build-go/slots.go

@@ -0,0 +1,81 @@
+package main
+
+// The bound on the processes one ask starts (issue 1921, try speed S10; ADR 0541): the levels of an ask run side by side,
+// the unit level in this process and the integration level in a shut-off process of its own, and they share one bound,
+// the processors divided by the node's build capacity. The bound lives in the ask's workspace as lock files, one per
+// slot, so both processes count against it.
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+	"sync/atomic"
+	"syscall"
+)
+
+// slotsDir is the directory in a workspace's root holding its slots.
+const slotsDir = "slots"
+
+// askDirs are the directories an ask keeps in its workspace's root beside its tree, gone with the workspace: its cache
+// layer and its bound on processes.
+var askDirs = []string{cacheLayerDir, slotsDir}
+
+// numCPU is the node's processor count.
+func numCPU() int { return runtime.NumCPU() }
+
+// slotPool is the bound of one workspace: n slots, each a lock file under dir.
+type slotPool struct {
+	dir  string
+	n    int
+	next *atomic.Uint32
+}
+
+// slotTurns spreads the waits of the commands that find every slot taken over the slots.
+var slotTurns atomic.Uint32
+
+// slots is the bound of the workspace's processes, m.parallel() slots.
+func (m *Module) slots(workspace string) slotPool {
+	return slotPool{dir: filepath.Join(m.Work, workspace, slotsDir), n: m.parallel(), next: &slotTurns}
+}
+
+// acquire takes a slot of the pool, waiting for one when every slot is taken, and answers what frees it. A free slot is
+// taken at once; when none is, the wait is on one slot, taken in turn, until its holder frees it.
+func (p slotPool) acquire(ctx context.Context) (func(), error) {
+	if err := os.MkdirAll(p.dir, 0o700); err != nil {
+		return nil, fmt.Errorf("the workspace's bound on processes: %w", err)
+	}
+	take := func(i int, how int) (func(), bool, error) {
+		f, err := os.OpenFile(filepath.Join(p.dir, "slot-"+strconv.Itoa(i)), os.O_CREATE|os.O_RDWR, 0o600)
+		if err != nil {
+			return nil, false, err
+		}
+		if err := syscall.Flock(int(f.Fd()), how); err != nil {
+			f.Close()
+			if err == syscall.EWOULDBLOCK {
+				return nil, false, nil
+			}
+			return nil, false, err
+		}
+		return func() { syscall.Flock(int(f.Fd()), syscall.LOCK_UN); f.Close() }, true, nil
+	}
+	for i := 0; i < p.n; i++ {
+		release, ok, err := take(i, syscall.LOCK_EX|syscall.LOCK_NB)
+		if err != nil {
+			return nil, fmt.Errorf("the workspace's bound on processes: %w", err)
+		}
+		if ok {
+			return release, nil
+		}
+	}
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+	release, _, err := take(int(p.next.Add(1))%p.n, syscall.LOCK_EX)
+	if err != nil {
+		return nil, fmt.Errorf("the workspace's bound on processes: %w", err)
+	}
+	return release, nil
+}

modules/mesh-build-go/cmd/mesh-build-go/slots_test.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"context"
+	"strings"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"git.novox.be/novox/mesh-sdk/go/delivery"
+	"git.novox.be/novox/mesh-sdk/go/forgekey"
+)
+
+// 1921/S10 (ADR 0541): the levels of one ask, running side by side, share one bound on the processes they start: the
+// bound is the workspace's, so a slot another level of the ask holds is one this level waits for.
+func TestTheLevelsOfAnAskShareOneBoundOnProcesses(t *testing.T) {
+	m, states, ws, _ := workspaceFor(t, "failing")
+	m.Parallel = 1
+	held, err := m.slots(ws).acquire(context.Background()) // the other level holds the one slot
+	if err != nil {
+		t.Fatal(err)
+	}
+	var ran atomic.Int32
+	inner := m.Run
+	m.Run = func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		if strings.Contains(strings.Join(args, " "), " go ") || name == "go" {
+			ran.Add(1)
+		}
+		return inner(ctx, env, name, args...)
+	}
+	done := make(chan delivery.Step, 1)
+	go func() { _, st := runUnit(t, m, states, ws); done <- st }()
+	time.Sleep(150 * time.Millisecond)
+	if n := ran.Load(); n != 0 {
+		t.Errorf("%d go commands ran while the ask's one slot was held by its other level", n)
+	}
+	held()
+	select {
+	case st := <-done:
+		if st.State != delivery.StepPassed {
+			t.Errorf("the step ended %s: %s", st.State, st.Reason)
+		}
+	case <-time.After(3 * time.Second):
+		t.Fatal("the level never ran after the slot was freed")
+	}
+	if ran.Load() == 0 {
+		t.Error("no go command ran")
+	}
+}
+
+// 1921/S10 (ADR 0541): the bound is the processors divided by the node's build capacity, not each level half of them.
+func TestTheBoundIsTheProcessorsDividedByTheBuildCapacity(t *testing.T) {
+	m := &Module{Capacity: func() int { return 3 }}
+	if got, want := m.parallel(), max(1, numCPU()/3); got != want {
+		t.Errorf("parallel = %d, want %d", got, want)
+	}
+	m = &Module{}
+	if got, want := m.parallel(), max(1, numCPU()/2); got != want {
+		t.Errorf("with no capacity known parallel = %d, want %d", got, want)
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/tagged.go

@@ -0,0 +1,161 @@
+package main
+
+// The integration level runs the tests its tags add, not the unit tests again (issue 1921, try speed S7): `go test
+// -tags integration` without -run would run every untagged test too, and the unit level ran those already. Which tests a
+// tag adds is read from the source: a test function in a _test.go file whose //go:build line holds with the level's
+// tags and does not hold without them.
+
+import (
+	"go/ast"
+	"go/build/constraint"
+	"go/parser"
+	"go/token"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sort"
+	"strings"
+	"unicode"
+	"unicode/utf8"
+)
+
+// taggedRun is what the integration level runs in one go.mod directory: the packages holding a test the tags add, by
+// import path, and the -run pattern naming those tests.
+type taggedRun struct {
+	packages []string
+	pattern  string
+}
+
+// taggedTests reads, for each go.mod directory, the tests that tags add. selected are the packages the level was asked
+// to run (import paths, as build_go_digest keys them); none, or a relative pattern, is every package. A directory with no
+// test the tags add is left out of the answer.
+func taggedTests(tree string, dirs, selected, tags []string) (map[string]taggedRun, error) {
+	want := map[string]bool{}
+	for _, p := range selected {
+		if strings.HasPrefix(p, "./") || p == "." {
+			want = nil
+			break
+		}
+		want[p] = true
+	}
+	if len(selected) == 0 {
+		want = nil
+	}
+	with := map[string]bool{}
+	for _, t := range tags {
+		with[t] = true
+	}
+	out := map[string]taggedRun{}
+	for _, d := range dirs {
+		raw, _ := os.ReadFile(filepath.Join(tree, d, "go.mod"))
+		mp := modulePath(string(raw))
+		base := filepath.Join(tree, d)
+		pkgs := map[string]bool{}
+		names := map[string]bool{}
+		err := lintable(base, func(path string) error {
+			if !strings.HasSuffix(path, "_test.go") {
+				return nil
+			}
+			src, err := os.ReadFile(path)
+			if err != nil {
+				return err
+			}
+			expr := buildLine(src)
+			if expr == nil || !expr.Eval(func(tag string) bool { return with[tag] || platformTag(tag) }) || expr.Eval(platformTag) {
+				return nil // no constraint, or one the tags do not change: the unit level's
+			}
+			rel, _ := filepath.Rel(base, filepath.Dir(path))
+			pkg := mp
+			if rel != "." {
+				pkg = mp + "/" + filepath.ToSlash(rel)
+			}
+			if want != nil && !want[pkg] {
+				return nil
+			}
+			found := testNames(path, src)
+			for _, n := range found {
+				names[n] = true
+			}
+			if len(found) > 0 {
+				pkgs[pkg] = true
+			}
+			return nil
+		})
+		if err != nil {
+			return nil, err
+		}
+		if len(pkgs) == 0 {
+			continue
+		}
+		run := taggedRun{packages: sortedKeys(pkgs)}
+		run.pattern = "^(" + strings.Join(sortedKeys(names), "|") + ")$"
+		out[d] = run
+	}
+	return out, nil
+}
+
+func sortedKeys(m map[string]bool) []string {
+	out := make([]string, 0, len(m))
+	for k := range m {
+		out = append(out, k)
+	}
+	sort.Strings(out)
+	return out
+}
+
+// buildLine is a file's //go:build constraint, nil when it has none.
+func buildLine(src []byte) constraint.Expr {
+	for _, line := range strings.Split(string(src), "\n") {
+		line = strings.TrimSpace(line)
+		if strings.HasPrefix(line, "package ") {
+			break
+		}
+		if constraint.IsGoBuild(line) {
+			if e, err := constraint.Parse(line); err == nil {
+				return e
+			}
+		}
+	}
+	return nil
+}
+
+// platformTag is how a tag other than the level's evaluates, the same with the level's tags and without them: the
+// machine's platform, unix, cgo and every Go version hold; any other tag does not.
+func platformTag(tag string) bool {
+	switch tag {
+	case runtime.GOOS, runtime.GOARCH, "unix", "cgo", "gc":
+		return true
+	}
+	return strings.HasPrefix(tag, "go1.")
+}
+
+// testNames are the top-level test functions of a test file: func TestXxx, as go test runs them, TestMain left out.
+func testNames(path string, src []byte) []string {
+	f, err := parser.ParseFile(token.NewFileSet(), path, src, parser.SkipObjectResolution)
+	if err != nil {
+		return nil // a file that does not parse fails the compile, which the run reports
+	}
+	var out []string
+	for _, decl := range f.Decls {
+		fn, ok := decl.(*ast.FuncDecl)
+		if !ok || fn.Recv != nil || fn.Name.Name == "TestMain" || !isTestName(fn.Name.Name) {
+			continue
+		}
+		out = append(out, fn.Name.Name)
+	}
+	return out
+}
+
+// isTestName says whether go test runs a function of this name as a test: Test, then nothing or a rune that is not
+// lower case.
+func isTestName(name string) bool {
+	rest, ok := strings.CutPrefix(name, "Test")
+	if !ok {
+		return false
+	}
+	if rest == "" {
+		return true
+	}
+	r, _ := utf8.DecodeRuneInString(rest)
+	return !unicode.IsLower(r)
+}

modules/mesh-build-go/cmd/mesh-build-go/test.go

@@ -10,7 +10,6 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
-	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -171,6 +170,9 @@ type levelOpts struct {
 	// parallelism, where the unit level's is the slowest package's.
 	setup time.Duration
 	wall  bool
+	// runByDir is the -run pattern of each go.mod directory, over run: the tests the integration level's tags add there
+	// (issue 1921, try speed S7).
+	runByDir map[string]string
 	// compose is a state of the level to put in the result (the store and the bus it ran against).
 	store, bus string
 }
@@ -205,35 +207,56 @@ func (m *Module) runLevel(ctx context.Context, tree string, o levelOpts) (*TestR
 			todo = append(todo, d)
 		}
 	}
+	// The level's commands share one bound on processes with each other and with the ask's other level: the lint's and
+	// the tests' (issue 1921, try speed S4, S10).
+	slots := m.slots(o.workspace)
+	var lintFailed []Failure
+	var lintErr error
+	var lintDone chan struct{}
+	var crash any // a panic of a run or of the lint goes on in the caller, which cleans up after it
+	var crashMu sync.Mutex
 	if o.level == LevelUnit {
-		// gofmt and go vet of each directory the level runs come before its tests (ADR 0529 §1; issue 1887 D7-go): a
+		// gofmt and go vet of each directory the level runs, beside its tests (ADR 0529 §1; issue 1887 D7-go; issue 1921,
-		// directory that fails them fails the level at once, and their time is the result's Lint.
+		// try speed S4): a directory that fails them fails the level, and their time is the result's Lint.
-		linted := m.clock()
+		lintDone = make(chan struct{})
-		failed, err := m.lintAll(ctx, run, tree, todo, func(d string) []string {
+		go func() {
-			return append(m.goEnvFor(filepath.Join(tree, d)), o.env...)
+			defer close(lintDone)
-		})
+			defer func() {
-		if err != nil {
+				if p := recover(); p != nil {
-			return nil, err
+					crashMu.Lock()
-		}
+					crash = p
-		res.Lint = m.clock().Sub(linted).Seconds()
+					crashMu.Unlock()
-		if len(failed) > 0 {
+				}
-			res.Failed = failed
+			}()
-			res.judge(o.bounds)
+			linted := m.clock()
-			return res, nil
+			// go vet compiles and runs nothing of the change, so it warms the shared cache for every later check, a pull
-		}
+			// request's head included (issue 1921, try speed S11; the operator's decision); the tests run beneath the
-		began = m.clock() // the level's running time is its tests'
+			// ask's own layer.
+			compile, err := m.stepRunner(o.workspace, true)
+			if err != nil {
+				lintErr = err
+				return
+			}
+			lintFailed, lintErr = m.lintAll(ctx, compile, tree, todo, func(d string) []string {
+				return append(m.goEnvFor(filepath.Join(tree, d)), o.env...)
+			}, byDir, slots.acquire)
+			lintFailed = append(m.addedBinaries(ctx, m.Run, tree), lintFailed...) // git alone, no code of the change
+			res.Lint = m.clock().Sub(linted).Seconds()
+		}()
 	}
 	runs := make([]dirRun, len(todo))
-	slots := make(chan struct{}, m.parallel())
 	var wg sync.WaitGroup
-	var crash any // a panic of a run goes on in the caller, which cleans up after it
+	var slotErr error
-	var crashMu sync.Mutex
 	for i, d := range todo {
+		release, err := slots.acquire(ctx)
+		if err != nil {
+			slotErr = err
+			break
+		}
 		wg.Add(1)
-		slots <- struct{}{}
 		go func() {
 			defer wg.Done()
-			defer func() { <-slots }()
+			defer release()
 			defer func() {
 				if p := recover(); p != nil {
 					crashMu.Lock()
@@ -245,7 +268,9 @@ func (m *Module) runLevel(ctx context.Context, tree string, o levelOpts) (*TestR
 			if len(o.tags) > 0 {
 				args = append(args, "-tags", strings.Join(o.tags, ","))
 			}
-			if o.run != "" {
+			if r := o.runByDir[d]; r != "" {
+				args = append(args, "-run", r)
+			} else if o.run != "" {
 				args = append(args, "-run", o.run)
 			}
 			args = append(args, byDir[d]...)
@@ -258,9 +283,19 @@ func (m *Module) runLevel(ctx context.Context, tree string, o levelOpts) (*TestR
 		}()
 	}
 	wg.Wait()
+	if lintDone != nil {
+		<-lintDone
+	}
 	if crash != nil {
 		panic(crash)
 	}
+	if lintErr != nil {
+		return nil, lintErr
+	}
+	if slotErr != nil {
+		return nil, slotErr
+	}
+	res.Failed = append(res.Failed, lintFailed...) // the lint's failures first, then the tests'
 	for i, d := range todo {
 		dr := runs[i]
 		if (dr.r.Status != 0 || dr.r.Err != "") && len(dr.rd.pkgs) == 0 {
@@ -286,12 +321,20 @@ func (m *Module) runLevel(ctx context.Context, tree string, o levelOpts) (*TestR
 // runAnswer is what a step runner answers.
 type runAnswer = forgekey.Ran
 
-// parallel is how many directories a level runs at once.
+// parallel is how many processes the levels of one ask start at once, together (ADR 0541; issue 1921, try speed S10):
+// the processors divided by the node's build capacity, half of them when the capacity is not known.
 func (m *Module) parallel() int {
 	if m.Parallel > 0 {
 		return m.Parallel
 	}
-	return max(1, runtime.NumCPU()/2)
+	capacity := 0
+	if m.Capacity != nil {
+		capacity = m.Capacity()
+	}
+	if capacity <= 0 {
+		capacity = 2
+	}
+	return max(1, numCPU()/capacity)
 }
 
 // packagesByDir says which patterns run in which go.mod directory. A relative pattern (./...) runs in every directory, as

modules/mesh-build-go/cmd/mesh-build-go/test_real_integration_test.go

@@ -66,7 +66,9 @@ func TestUnitLevelRunsTheRealGoOnTheFixtureRepositories(t *testing.T) {
 		"tagged":  {passed: true, noTests: true},
 		"empty":   {passed: true, noTests: true},
 		"slow":    {passed: true},
-		"broken":  {failed: "."}, // go vet, before the tests since R4g (ADR 0529 §1), names the directory and the compiler's line
+		// go vet, the lint step beside the tests (ADR 0542 §2), names the directory and the compiler's line; the test run
+		// of the package that does not compile fails beside it
+		"broken": {failed: "."},
 	}
 	for name, w := range want {
 		home := t.TempDir()
@@ -84,14 +86,16 @@ func TestUnitLevelRunsTheRealGoOnTheFixtureRepositories(t *testing.T) {
 		if err != nil {
 			t.Fatalf("%s: %v", name, err)
 		}
-		if res.Passed != w.passed || res.NoTests != w.noTests || (w.failed != "" && (len(res.Failed) != 1 || res.Failed[0].Package != w.failed)) {
+		lintFirst := w.failed != "." || (len(res.Failed) >= 1 && res.Failed[0].Step == StepLint)
+		if res.Passed != w.passed || res.NoTests != w.noTests || !lintFirst ||
+			(w.failed != "" && (len(res.Failed) == 0 || res.Failed[0].Package != w.failed)) {
 			t.Errorf("%s: result = %+v", name, res)
 		}
 	}
 }
 
-// 1887/D7-go against the real go: a tree holding an unformatted file fails the unit level naming the file, before any
+// 1887/D7-go against the real go: a tree holding an unformatted file fails the check naming the file, as the lint step's
-// test runs, and the level's result carries the lint's time.
+// failure (ADR 0542 §2), and the level's result carries the lint's time.
 func TestAnUnformattedFileFailsTheRealUnitLevel(t *testing.T) {
 	needTools(t, "the unit level's gofmt and vet", "go", "git", "bwrap")
 	home := t.TempDir()
@@ -111,8 +115,9 @@ func TestAnUnformattedFileFailsTheRealUnitLevel(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if res.Passed || len(res.Failed) == 0 || res.Failed[0].Test != "gofmt" || !strings.Contains(res.Failed[0].Output, "ugly.go") || res.Tests != 0 {
+	if res.Passed || len(res.Failed) == 0 || res.Failed[0].Test != "gofmt" || res.Failed[0].Step != StepLint ||
-		t.Fatalf("result = %+v, want the level failed by gofmt naming ugly.go and no test run", res)
+		!strings.Contains(res.Failed[0].Output, "ugly.go") || res.Lint <= 0 {
+		t.Fatalf("result = %+v, want the lint step failed by gofmt naming ugly.go, with its time", res)
 	}
 }
 
@@ -156,9 +161,8 @@ func TestIntegrationLevelRunsAgainstARealStoreAndBusAndLeavesNothing(t *testing.
 	if !res.Passed || res.Tests != 1 || res.Setup <= 0 || res.Setup > IntegrationSetup.Seconds() {
 		t.Errorf("result = %+v", res)
 	}
-	entries, _ := os.ReadDir(filepath.Join(work, "ws1"))
+	if left := workspaceLeft(filepath.Join(work, "ws1")); len(left) != 1 || left[0] != "tree" {
-	if len(entries) != 1 || entries[0].Name() != "tree" {
+		t.Errorf("the workspace holds %v besides the ask's own directories, want only its tree: the run directory is gone", left)
-		t.Errorf("the workspace holds %v, want only its tree: the run directory is gone", entries)
 	}
 	for deadline := time.Now().Add(5 * time.Second); len(processesNamed(work)) > 0 && time.Now().Before(deadline); time.Sleep(100 * time.Millisecond) {
 	}

modules/mesh-build-go/cmd/mesh-build-go/test_test.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+	"sync"
 	"testing"
 	"time"
 
@@ -25,8 +26,11 @@ func capturedRunner(t *testing.T, captured string, calls *[]cmdRecord) forgekey.
 	if strings.Contains(string(raw), `"Action":"fail"`) {
 		status = 1 // go test exits 1 when a test or a build failed
 	}
+	var mu sync.Mutex // the lint and the tests of a level run at once (issue 1921, try speed S4)
 	return func(ctx context.Context, env []string, name string, args ...string) forgekey.Ran {
+		mu.Lock()
 		*calls = append(*calls, cmdRecord{env: env, line: name + " " + strings.Join(args, " ")})
+		mu.Unlock()
 		switch {
 		case name == "git" && args[2] == "ls-files":
 			return forgekey.Ran{Stdout: "go.mod\n"}
@@ -103,6 +107,33 @@ func TestUnitLevelNamesTheFailingTestAndFailsTheLevel(t *testing.T) {
 	}
 }
 
+// Issue 1921: a fixture with a failing test in each of two packages: one level's run names both, each with its own
+// cause, and counts every test, the passing one beside a failure too. go test runs every package to its end; nothing
+// stops at the first failure.
+func TestUnitLevelNamesEveryFailingTestOfEveryPackage(t *testing.T) {
+	m, states, ws, calls := workspaceFor(t, "twofailing")
+	res, st := runUnit(t, m, states, ws)
+	if st.State != delivery.StepPassed || res.Passed {
+		t.Fatalf("step %s (%s), result %+v: want the step done and the level failed", st.State, st.Reason, res)
+	}
+	var got []string
+	for _, f := range res.Failed {
+		got = append(got, f.Package+"."+f.Test+": "+f.Cause)
+	}
+	want := []string{"fixture/twofailing/one.TestOneIsTwo: One() = 1, want 2", "fixture/twofailing/two.TestTwoIsThree: Two() = 2, want 3"}
+	if strings.Join(got, "\n") != strings.Join(want, "\n") {
+		t.Errorf("failed\n%s\nwant\n%s", strings.Join(got, "\n"), strings.Join(want, "\n"))
+	}
+	if res.Tests != 3 {
+		t.Errorf("%d tests counted, want 3", res.Tests)
+	}
+	for _, c := range *calls {
+		if strings.Contains(c.line, " test ") && strings.Contains(c.line, "-failfast") {
+			t.Errorf("go test ran with -failfast: %s", c.line)
+		}
+	}
+}
+
 // 1290/AC2: a fixture whose tests take more than the bound (lowered by the module's option, not by waiting five
 // seconds): the level fails naming the bound and the slowest tests; under the real bound the same run passes.
 func TestUnitLevelOverItsBoundFailsNamingTheBoundAndTheSlowestTests(t *testing.T) {

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/README

@@ -1,6 +1,7 @@
 Each file is the standard output of `GOTOOLCHAIN=go1.27.1 GOFLAGS=-mod=mod go test -count=1 -json ./...` (go1.27.1)
 run in the fixture module of the same name under ../repos, captured on 2026-10-20 for issue 1290. The unit
-tests feed them to the parser through a fake runner, so no test here runs `go test`.
+tests feed them to the parser through a fake runner, so no test here runs `go test`. twofailing.json was captured the
+same way on 2026-10-24 for issue 1921: two packages with a failing test each, and a passing test beside one of them.
 
 golist-external.json is `GOTOOLCHAIN=go1.27.1 GOFLAGS=-mod=mod go list -json=ImportPath,Standard,DepOnly,Module
 git.novox.be/novox/mesh-sdk/go/buildstep` run in this module (go1.27.1, 2026-10-20 for issue 1291): a package of a module
@@ -24,15 +25,3 @@ The tar streams (the archives gunzipped) of the three archives above, captured t
 gunzip and sha256) at origin/main 0205b8f7 on 2026-10-21: directory f8af1d94...d1b6, within 294e2bec...07fb, file
 055cffc2...428e. The digests above hold the gzip bytes of go1.27.1. The first try of issue 1589 on the merge check's build node answered
 other digests; the tests therefore compare the stream always and the digest only under go1.27.1.
-
-go-test-json-pkg-*.jsonl are the standard output and error of `go test -json -count=1 ./...` (go1.27.3, the timeouts with
-`-timeout 2s`), captured on 2026-10-25 for issue 1901 in throwaway one-file modules that each fail without a test's own
-assertion: panicking (a nil map write in TestPanics), timeout (TestWaitsForever sleeps past the timeout), deeptimeout (two
-parallel tests and sixty blocked goroutines past the timeout, so the goroutine dump pushes the panic line out of the last
-4 KB), buildfail (a type error in a test file), exiting (os.Exit(3) in TestExits), killed (TestKilled sends itself SIGKILL),
-passthenfail (TestMain panics in a goroutine after m.Run passed) and mainexit (TestMain exits 2 after m.Run passed: go test
-prints "PASS" and then "FAIL <pkg>").
-go-test-json-pkg-race.jsonl and go-test-json-pkg-racemain.jsonl are the same, with `go test -race -json -count=1 ./...`
-(CGO_ENABLED=1, go1.27.3, 2026-10-25, issue 1901): race (TestRacesOnTheSeat writes a package variable from itself and a
-goroutine) and racemain (TestMain does so after m.Run passed: go test prints "PASS", then the race report and "Found 1
-data race(s)", then "FAIL <pkg>").

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-buildfail.jsonl

@@ -1,6 +0,0 @@
-{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-output","Output":"# example.com/buildfail [example.com/buildfail.test]\n"}
-{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-output","Output":"./p_test.go:5:40: cannot use \"seat\" (untyped string constant) as int value in variable declaration\n"}
-{"ImportPath":"example.com/buildfail [example.com/buildfail.test]","Action":"build-fail"}
-{"Time":"2026-10-25T15:34:33.261137737+01:00","Action":"start","Package":"example.com/buildfail"}
-{"Time":"2026-10-25T15:34:33.261255019+01:00","Action":"output","Package":"example.com/buildfail","Output":"FAIL\texample.com/buildfail [build failed]\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.261268099+01:00","Action":"fail","Package":"example.com/buildfail","Elapsed":0,"FailedBuild":"example.com/buildfail [example.com/buildfail.test]"}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-deeptimeout.jsonl

@@ -1,417 +0,0 @@
-{"Time":"2026-10-25T15:35:18.991630993+01:00","Action":"start","Package":"example.com/deeptimeout"}
-{"Time":"2026-10-25T15:35:18.993895188+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
-{"Time":"2026-10-25T15:35:18.993963909+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== RUN   TestHoldsTheSeat\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:18.99399484+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== PAUSE TestHoldsTheSeat\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:18.9939982+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
-{"Time":"2026-10-25T15:35:18.99400173+01:00","Action":"run","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
-{"Time":"2026-10-25T15:35:18.99400456+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== RUN   TestWaitsForTheBus\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:18.99400838+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== PAUSE TestWaitsForTheBus\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:18.99401133+01:00","Action":"pause","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
-{"Time":"2026-10-25T15:35:18.99401441+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat"}
-{"Time":"2026-10-25T15:35:18.99401704+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestHoldsTheSeat","Output":"=== CONT  TestHoldsTheSeat\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:18.994074141+01:00","Action":"cont","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus"}
-{"Time":"2026-10-25T15:35:18.994102612+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"=== CONT  TestWaitsForTheBus\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:21.00935195+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"panic: test timed out after 2s\n"}
-{"Time":"2026-10-25T15:35:21.00938383+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\trunning tests:\n"}
-{"Time":"2026-10-25T15:35:21.009394391+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestHoldsTheSeat (2s)\n"}
-{"Time":"2026-10-25T15:35:21.009398021+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t\tTestWaitsForTheBus (2s)\n"}
-{"Time":"2026-10-25T15:35:21.009401801+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.009406481+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 81 [running]:\n"}
-{"Time":"2026-10-25T15:35:21.009409911+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.(*M).startAlarm.func1()\n"}
-{"Time":"2026-10-25T15:35:21.009413361+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2961 +0x34a\n"}
-{"Time":"2026-10-25T15:35:21.009418341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by time.goFunc\n"}
-{"Time":"2026-10-25T15:35:21.009421781+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/time/sleep.go:182 +0x2d\n"}
-{"Time":"2026-10-25T15:35:21.009424991+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.009428341+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 1 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.009431721+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner.func1()\n"}
-{"Time":"2026-10-25T15:35:21.009441811+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2144 +0x425\n"}
-{"Time":"2026-10-25T15:35:21.009445511+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.tRunner(0x282e9702008, 0x282e9646bc8)\n"}
-{"Time":"2026-10-25T15:35:21.009449641+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/usr/lib/go/src/testing/testing.go:2201 +0x123\n"}
-{"Time":"2026-10-25T15:35:21.009453471+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"testing.runTests({0x55a45d, 0x17}, {0x55a45d, 0x17}, 0x282e95940f0, {0x6f19f0, 0x2, 0x2}, {0xc2afa2ca3b3c0c8d, 0x7737f168, ...})\n"}
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-{"Time":"2026-10-25T15:35:21.010718431+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010721691+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010724371+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010727362+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 59 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010730592+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010733662+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010736712+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010740162+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010742922+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010745772+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 60 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010752222+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010755402+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010758542+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010761822+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010764592+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010767992+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 61 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010771062+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010774282+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010779382+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010782942+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010785722+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010788573+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 62 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010791893+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010794943+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010798083+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010801683+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010804293+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010807283+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 63 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010810443+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010813553+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010816793+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010820233+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010823063+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010829493+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 64 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010832683+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010835953+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010839223+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010842463+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010845333+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010848423+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 65 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010851663+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010854964+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010858364+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010861714+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010864914+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010867984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 66 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010870944+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010874114+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010877464+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010880504+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010883144+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010886194+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 67 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010889154+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010892234+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010895524+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010902154+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.010904984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\n"}
-{"Time":"2026-10-25T15:35:21.010907984+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"goroutine 68 [chan receive]:\n"}
-{"Time":"2026-10-25T15:35:21.010911064+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"example.com/deeptimeout.TestHoldsTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:35:21.010914074+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x19\n"}
-{"Time":"2026-10-25T15:35:21.010917365+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"created by example.com/deeptimeout.TestHoldsTheSeat in goroutine 7\n"}
-{"Time":"2026-10-25T15:35:21.010920505+01:00","Action":"output","Package":"example.com/deeptimeout","Test":"TestWaitsForTheBus","Output":"\t/tmp/fix-1901b/deeptimeout/p_test.go:12 +0x37\n"}
-{"Time":"2026-10-25T15:35:21.013209581+01:00","Action":"output","Package":"example.com/deeptimeout","Output":"FAIL\texample.com/deeptimeout\t2.021s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:35:21.013258851+01:00","Action":"fail","Package":"example.com/deeptimeout","Elapsed":2.022}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-exiting.jsonl

@@ -1,10 +0,0 @@
-{"Time":"2026-10-25T15:34:33.768742837+01:00","Action":"start","Package":"example.com/exiting"}
-{"Time":"2026-10-25T15:34:33.773822287+01:00","Action":"run","Package":"example.com/exiting","Test":"TestFine"}
-{"Time":"2026-10-25T15:34:33.773896608+01:00","Action":"output","Package":"example.com/exiting","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.773940319+01:00","Action":"output","Package":"example.com/exiting","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.773945359+01:00","Action":"pass","Package":"example.com/exiting","Test":"TestFine","Elapsed":0}
-{"Time":"2026-10-25T15:34:33.773952529+01:00","Action":"run","Package":"example.com/exiting","Test":"TestExits"}
-{"Time":"2026-10-25T15:34:33.773956439+01:00","Action":"output","Package":"example.com/exiting","Test":"TestExits","Output":"=== RUN   TestExits\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.773959829+01:00","Action":"output","Package":"example.com/exiting","Test":"TestExits","Output":"    p_test.go:11: closing the store\n"}
-{"Time":"2026-10-25T15:34:33.775158538+01:00","Action":"output","Package":"example.com/exiting","Output":"FAIL\texample.com/exiting\t0.006s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.775186509+01:00","Action":"fail","Package":"example.com/exiting","Elapsed":0.006}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-killed.jsonl

@@ -1,7 +0,0 @@
-{"Time":"2026-10-25T15:34:34.328258934+01:00","Action":"start","Package":"example.com/killed"}
-{"Time":"2026-10-25T15:34:34.331465435+01:00","Action":"run","Package":"example.com/killed","Test":"TestKilled"}
-{"Time":"2026-10-25T15:34:34.331699248+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"=== RUN   TestKilled\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.331853111+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"    p_test.go:10: the kernel is about to kill this\n"}
-{"Time":"2026-10-25T15:34:34.334563213+01:00","Action":"output","Package":"example.com/killed","Test":"TestKilled","Output":"signal: killed\n"}
-{"Time":"2026-10-25T15:34:34.334611114+01:00","Action":"output","Package":"example.com/killed","Output":"FAIL\texample.com/killed\t0.006s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.334627134+01:00","Action":"fail","Package":"example.com/killed","Elapsed":0.006}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-mainexit.jsonl

@@ -1,8 +0,0 @@
-{"Time":"2026-10-25T15:34:35.274953775+01:00","Action":"start","Package":"example.com/mainexit"}
-{"Time":"2026-10-25T15:34:35.278129565+01:00","Action":"run","Package":"example.com/mainexit","Test":"TestFine"}
-{"Time":"2026-10-25T15:34:35.278191516+01:00","Action":"output","Package":"example.com/mainexit","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:35.278341979+01:00","Action":"output","Package":"example.com/mainexit","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:35.278351739+01:00","Action":"pass","Package":"example.com/mainexit","Test":"TestFine","Elapsed":0}
-{"Time":"2026-10-25T15:34:35.278359039+01:00","Action":"output","Package":"example.com/mainexit","Output":"PASS\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:35.279516487+01:00","Action":"output","Package":"example.com/mainexit","Output":"FAIL\texample.com/mainexit\t0.004s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:35.279539298+01:00","Action":"fail","Package":"example.com/mainexit","Elapsed":0.005}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-panicking.jsonl

@@ -1,27 +0,0 @@
-{"Time":"2026-10-25T15:34:33.031091436+01:00","Action":"start","Package":"example.com/panicking"}
-{"Time":"2026-10-25T15:34:33.036353279+01:00","Action":"run","Package":"example.com/panicking","Test":"TestBefore"}
-{"Time":"2026-10-25T15:34:33.036441781+01:00","Action":"output","Package":"example.com/panicking","Test":"TestBefore","Output":"=== RUN   TestBefore\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.036568163+01:00","Action":"output","Package":"example.com/panicking","Test":"TestBefore","Output":"--- PASS: TestBefore (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.036609863+01:00","Action":"pass","Package":"example.com/panicking","Test":"TestBefore","Elapsed":0}
-{"Time":"2026-10-25T15:34:33.036641304+01:00","Action":"run","Package":"example.com/panicking","Test":"TestPanics"}
-{"Time":"2026-10-25T15:34:33.036645914+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"=== RUN   TestPanics\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.036698995+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"    p_test.go:8: about to look up the seat\n"}
-{"Time":"2026-10-25T15:34:33.036773996+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"--- FAIL: TestPanics (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.03897418+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"panic: assignment to entry in nil map [recovered, repanicked]\n"}
-{"Time":"2026-10-25T15:34:33.040332172+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\n"}
-{"Time":"2026-10-25T15:34:33.040414493+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"goroutine 8 [running]:\n"}
-{"Time":"2026-10-25T15:34:33.040521475+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner.func1.2({0x6b8120, 0x6eff80})\n"}
-{"Time":"2026-10-25T15:34:33.040601826+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2125 +0x232\n"}
-{"Time":"2026-10-25T15:34:33.040641947+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner.func1()\n"}
-{"Time":"2026-10-25T15:34:33.040720648+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2128 +0x329\n"}
-{"Time":"2026-10-25T15:34:33.04083286+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"panic({0x6b8120?, 0x6eff80?})\n"}
-{"Time":"2026-10-25T15:34:33.040912921+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/runtime/panic.go:859 +0x125\n"}
-{"Time":"2026-10-25T15:34:33.040981652+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"example.com/panicking.TestPanics(0x228226cd0488?)\n"}
-{"Time":"2026-10-25T15:34:33.041059903+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/tmp/fix-1901b/panicking/p_test.go:10 +0x53\n"}
-{"Time":"2026-10-25T15:34:33.041132704+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"testing.tRunner(0x228226cd0488, 0x6d5bc8)\n"}
-{"Time":"2026-10-25T15:34:33.041215586+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
-{"Time":"2026-10-25T15:34:33.041221966+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"created by testing.(*T).Run in goroutine 1\n"}
-{"Time":"2026-10-25T15:34:33.041225556+01:00","Action":"output","Package":"example.com/panicking","Test":"TestPanics","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
-{"Time":"2026-10-25T15:34:33.041984088+01:00","Action":"fail","Package":"example.com/panicking","Test":"TestPanics","Elapsed":0}
-{"Time":"2026-10-25T15:34:33.041996638+01:00","Action":"output","Package":"example.com/panicking","Output":"FAIL\texample.com/panicking\t0.010s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:33.042044079+01:00","Action":"fail","Package":"example.com/panicking","Elapsed":0.011}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-passthenfail.jsonl

@@ -1,15 +0,0 @@
-{"Time":"2026-10-25T15:34:34.919624192+01:00","Action":"start","Package":"example.com/passthenfail"}
-{"Time":"2026-10-25T15:34:34.922861224+01:00","Action":"run","Package":"example.com/passthenfail","Test":"TestFine"}
-{"Time":"2026-10-25T15:34:34.922932965+01:00","Action":"output","Package":"example.com/passthenfail","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.922969205+01:00","Action":"output","Package":"example.com/passthenfail","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.922979956+01:00","Action":"pass","Package":"example.com/passthenfail","Test":"TestFine","Elapsed":0}
-{"Time":"2026-10-25T15:34:34.922989416+01:00","Action":"output","Package":"example.com/passthenfail","Output":"PASS\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.925022528+01:00","Action":"output","Package":"example.com/passthenfail","Output":"panic: the bus closed after the tests: nats: connection closed\n"}
-{"Time":"2026-10-25T15:34:34.925043388+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\n"}
-{"Time":"2026-10-25T15:34:34.925046848+01:00","Action":"output","Package":"example.com/passthenfail","Output":"goroutine 20 [running]:\n"}
-{"Time":"2026-10-25T15:34:34.925051338+01:00","Action":"output","Package":"example.com/passthenfail","Output":"example.com/passthenfail.TestMain.func1()\n"}
-{"Time":"2026-10-25T15:34:34.925055878+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\t/tmp/fix-1901b/passthenfail/p_test.go:13 +0x25\n"}
-{"Time":"2026-10-25T15:34:34.925061428+01:00","Action":"output","Package":"example.com/passthenfail","Output":"created by example.com/passthenfail.TestMain in goroutine 1\n"}
-{"Time":"2026-10-25T15:34:34.925065028+01:00","Action":"output","Package":"example.com/passthenfail","Output":"\t/tmp/fix-1901b/passthenfail/p_test.go:13 +0x25\n"}
-{"Time":"2026-10-25T15:34:34.925390203+01:00","Action":"output","Package":"example.com/passthenfail","Output":"FAIL\texample.com/passthenfail\t0.005s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:34.925402904+01:00","Action":"fail","Package":"example.com/passthenfail","Elapsed":0.006}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-race.jsonl

@@ -1,53 +0,0 @@
-{"Time":"2026-10-25T15:50:42.908557309+01:00","Action":"start","Package":"example.com/race"}
-{"Time":"2026-10-25T15:50:42.924298679+01:00","Action":"run","Package":"example.com/race","Test":"TestBefore"}
-{"Time":"2026-10-25T15:50:42.92438195+01:00","Action":"output","Package":"example.com/race","Test":"TestBefore","Output":"=== RUN   TestBefore\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.924648842+01:00","Action":"output","Package":"example.com/race","Test":"TestBefore","Output":"--- PASS: TestBefore (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.924685133+01:00","Action":"pass","Package":"example.com/race","Test":"TestBefore","Elapsed":0}
-{"Time":"2026-10-25T15:50:42.924728573+01:00","Action":"run","Package":"example.com/race","Test":"TestRacesOnTheSeat"}
-{"Time":"2026-10-25T15:50:42.924733573+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"=== RUN   TestRacesOnTheSeat\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.92637298+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"==================\n"}
-{"Time":"2026-10-25T15:50:42.92641567+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"WARNING: DATA RACE\n"}
-{"Time":"2026-10-25T15:50:42.926444061+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Write at 0x000000833468 by goroutine 10:\n"}
-{"Time":"2026-10-25T15:50:42.926462621+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat.func1()\n"}
-{"Time":"2026-10-25T15:50:42.926467121+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:13 +0x24\n"}
-{"Time":"2026-10-25T15:50:42.926483061+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
-{"Time":"2026-10-25T15:50:42.926509741+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Previous write at 0x000000833468 by goroutine 9:\n"}
-{"Time":"2026-10-25T15:50:42.926530142+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat()\n"}
-{"Time":"2026-10-25T15:50:42.926534952+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:14 +0x30\n"}
-{"Time":"2026-10-25T15:50:42.926550462+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
-{"Time":"2026-10-25T15:50:42.926554612+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
-{"Time":"2026-10-25T15:50:42.926571142+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run.gowrap1()\n"}
-{"Time":"2026-10-25T15:50:42.926575812+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0x38\n"}
-{"Time":"2026-10-25T15:50:42.926592202+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
-{"Time":"2026-10-25T15:50:42.926607792+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Goroutine 10 (running) created at:\n"}
-{"Time":"2026-10-25T15:50:42.926624292+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  example.com/race.TestRacesOnTheSeat()\n"}
-{"Time":"2026-10-25T15:50:42.926628923+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /tmp/fix-1901b/race/p_test.go:13 +0x24\n"}
-{"Time":"2026-10-25T15:50:42.926643853+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
-{"Time":"2026-10-25T15:50:42.926648103+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
-{"Time":"2026-10-25T15:50:42.926674843+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run.gowrap1()\n"}
-{"Time":"2026-10-25T15:50:42.926680673+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0x38\n"}
-{"Time":"2026-10-25T15:50:42.926695433+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"\n"}
-{"Time":"2026-10-25T15:50:42.926711063+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"Goroutine 9 (running) created at:\n"}
-{"Time":"2026-10-25T15:50:42.926726614+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*T).Run()\n"}
-{"Time":"2026-10-25T15:50:42.926730814+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2260 +0xb12\n"}
-{"Time":"2026-10-25T15:50:42.926746484+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.runTests.func1()\n"}
-{"Time":"2026-10-25T15:50:42.926750764+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2744 +0x84\n"}
-{"Time":"2026-10-25T15:50:42.926765354+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.tRunner()\n"}
-{"Time":"2026-10-25T15:50:42.926769844+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2195 +0x21c\n"}
-{"Time":"2026-10-25T15:50:42.926791794+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.runTests()\n"}
-{"Time":"2026-10-25T15:50:42.926796704+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2742 +0x9e9\n"}
-{"Time":"2026-10-25T15:50:42.926811544+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  testing.(*M).Run()\n"}
-{"Time":"2026-10-25T15:50:42.926816694+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      /usr/lib/go/src/testing/testing.go:2602 +0xf44\n"}
-{"Time":"2026-10-25T15:50:42.926831695+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"  main.main()\n"}
-{"Time":"2026-10-25T15:50:42.926835935+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"      _testmain.go:50 +0x164\n"}
-{"Time":"2026-10-25T15:50:42.926850905+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"==================\n"}
-{"Time":"2026-10-25T15:50:42.935320241+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"    testing.go:1867: race detected during execution of test\n","OutputType":"error"}
-{"Time":"2026-10-25T15:50:42.935520113+01:00","Action":"output","Package":"example.com/race","Test":"TestRacesOnTheSeat","Output":"--- FAIL: TestRacesOnTheSeat (0.01s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.935592973+01:00","Action":"fail","Package":"example.com/race","Test":"TestRacesOnTheSeat","Elapsed":0.01}
-{"Time":"2026-10-25T15:50:42.935722225+01:00","Action":"run","Package":"example.com/race","Test":"TestAfter"}
-{"Time":"2026-10-25T15:50:42.935728845+01:00","Action":"output","Package":"example.com/race","Test":"TestAfter","Output":"=== RUN   TestAfter\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.935995928+01:00","Action":"output","Package":"example.com/race","Test":"TestAfter","Output":"--- PASS: TestAfter (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.936006328+01:00","Action":"pass","Package":"example.com/race","Test":"TestAfter","Elapsed":0}
-{"Time":"2026-10-25T15:50:42.936009978+01:00","Action":"output","Package":"example.com/race","Output":"FAIL\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.937730745+01:00","Action":"output","Package":"example.com/race","Output":"FAIL\texample.com/race\t0.028s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:42.937802066+01:00","Action":"fail","Package":"example.com/race","Elapsed":0.029}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-racemain.jsonl

@@ -1,27 +0,0 @@
-{"Time":"2026-10-25T15:50:43.551701745+01:00","Action":"start","Package":"example.com/racemain"}
-{"Time":"2026-10-25T15:50:43.570709708+01:00","Action":"run","Package":"example.com/racemain","Test":"TestFine"}
-{"Time":"2026-10-25T15:50:43.570806059+01:00","Action":"output","Package":"example.com/racemain","Test":"TestFine","Output":"=== RUN   TestFine\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:43.57085525+01:00","Action":"output","Package":"example.com/racemain","Test":"TestFine","Output":"--- PASS: TestFine (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:43.57086149+01:00","Action":"pass","Package":"example.com/racemain","Test":"TestFine","Elapsed":0}
-{"Time":"2026-10-25T15:50:43.57086974+01:00","Action":"output","Package":"example.com/racemain","Output":"PASS\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:43.572155623+01:00","Action":"output","Package":"example.com/racemain","Output":"==================\n"}
-{"Time":"2026-10-25T15:50:43.572168083+01:00","Action":"output","Package":"example.com/racemain","Output":"WARNING: DATA RACE\n"}
-{"Time":"2026-10-25T15:50:43.572171933+01:00","Action":"output","Package":"example.com/racemain","Output":"Write at 0x000000836428 by goroutine 9:\n"}
-{"Time":"2026-10-25T15:50:43.572176703+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain.func1()\n"}
-{"Time":"2026-10-25T15:50:43.572180053+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:15 +0x24\n"}
-{"Time":"2026-10-25T15:50:43.572184923+01:00","Action":"output","Package":"example.com/racemain","Output":"\n"}
-{"Time":"2026-10-25T15:50:43.572189613+01:00","Action":"output","Package":"example.com/racemain","Output":"Previous write at 0x000000836428 by main goroutine:\n"}
-{"Time":"2026-10-25T15:50:43.572192993+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain()\n"}
-{"Time":"2026-10-25T15:50:43.572198573+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:16 +0x44\n"}
-{"Time":"2026-10-25T15:50:43.572202433+01:00","Action":"output","Package":"example.com/racemain","Output":"  main.main()\n"}
-{"Time":"2026-10-25T15:50:43.572205623+01:00","Action":"output","Package":"example.com/racemain","Output":"      _testmain.go:48 +0x171\n"}
-{"Time":"2026-10-25T15:50:43.572208443+01:00","Action":"output","Package":"example.com/racemain","Output":"\n"}
-{"Time":"2026-10-25T15:50:43.572211573+01:00","Action":"output","Package":"example.com/racemain","Output":"Goroutine 9 (running) created at:\n"}
-{"Time":"2026-10-25T15:50:43.572214803+01:00","Action":"output","Package":"example.com/racemain","Output":"  example.com/racemain.TestMain()\n"}
-{"Time":"2026-10-25T15:50:43.572218043+01:00","Action":"output","Package":"example.com/racemain","Output":"      /tmp/fix-1901b/racemain/p_test.go:15 +0x37\n"}
-{"Time":"2026-10-25T15:50:43.572225414+01:00","Action":"output","Package":"example.com/racemain","Output":"  main.main()\n"}
-{"Time":"2026-10-25T15:50:43.572228654+01:00","Action":"output","Package":"example.com/racemain","Output":"      _testmain.go:48 +0x171\n"}
-{"Time":"2026-10-25T15:50:43.572231664+01:00","Action":"output","Package":"example.com/racemain","Output":"==================\n"}
-{"Time":"2026-10-25T15:50:44.581262249+01:00","Action":"output","Package":"example.com/racemain","Output":"Found 1 data race(s)\n"}
-{"Time":"2026-10-25T15:50:44.584693204+01:00","Action":"output","Package":"example.com/racemain","Output":"FAIL\texample.com/racemain\t1.031s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:50:44.584737425+01:00","Action":"fail","Package":"example.com/racemain","Elapsed":1.033}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/go-test-json-pkg-timeout.jsonl

@@ -1,43 +0,0 @@
-{"Time":"2026-10-25T15:34:36.049580618+01:00","Action":"start","Package":"example.com/timeout"}
-{"Time":"2026-10-25T15:34:36.053250986+01:00","Action":"run","Package":"example.com/timeout","Test":"TestQuick"}
-{"Time":"2026-10-25T15:34:36.053354018+01:00","Action":"output","Package":"example.com/timeout","Test":"TestQuick","Output":"=== RUN   TestQuick\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:36.053459789+01:00","Action":"output","Package":"example.com/timeout","Test":"TestQuick","Output":"--- PASS: TestQuick (0.00s)\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:36.05348499+01:00","Action":"pass","Package":"example.com/timeout","Test":"TestQuick","Elapsed":0}
-{"Time":"2026-10-25T15:34:36.0535114+01:00","Action":"run","Package":"example.com/timeout","Test":"TestWaitsForever"}
-{"Time":"2026-10-25T15:34:36.05351549+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"=== RUN   TestWaitsForever\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:36.053567451+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"    p_test.go:11: waiting for the bus\n"}
-{"Time":"2026-10-25T15:34:38.064693307+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"panic: test timed out after 2s\n"}
-{"Time":"2026-10-25T15:34:38.06487122+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\trunning tests:\n"}
-{"Time":"2026-10-25T15:34:38.06491684+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t\tTestWaitsForever (2s)\n"}
-{"Time":"2026-10-25T15:34:38.065034382+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
-{"Time":"2026-10-25T15:34:38.065108573+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 33 [running]:\n"}
-{"Time":"2026-10-25T15:34:38.065154754+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*M).startAlarm.func1()\n"}
-{"Time":"2026-10-25T15:34:38.065386208+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2961 +0x34a\n"}
-{"Time":"2026-10-25T15:34:38.065431878+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"created by time.goFunc\n"}
-{"Time":"2026-10-25T15:34:38.0655151+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/time/sleep.go:182 +0x2d\n"}
-{"Time":"2026-10-25T15:34:38.06553471+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
-{"Time":"2026-10-25T15:34:38.065847805+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 1 [chan receive]:\n"}
-{"Time":"2026-10-25T15:34:38.066038298+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*T).Run(0x3a0209bc8008, {0x5580aa?, 0x3a0209a9caa0?}, 0x6d5b10)\n"}
-{"Time":"2026-10-25T15:34:38.066047488+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2268 +0x4f2\n"}
-{"Time":"2026-10-25T15:34:38.066051368+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.runTests.func1(0x3a0209bc8008)\n"}
-{"Time":"2026-10-25T15:34:38.066056128+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2744 +0x37\n"}
-{"Time":"2026-10-25T15:34:38.066059478+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.tRunner(0x3a0209bc8008, 0x3a0209a9cbc8)\n"}
-{"Time":"2026-10-25T15:34:38.066064958+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
-{"Time":"2026-10-25T15:34:38.066069599+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.runTests({0x559017, 0x13}, {0x559017, 0x13}, 0x3a0209b8e0d8, {0x6f19f0, 0x2, 0x2}, {0xc2afa2bf832a3f56, 0x773908b5, ...})\n"}
-{"Time":"2026-10-25T15:34:38.066083309+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2742 +0x510\n"}
-{"Time":"2026-10-25T15:34:38.066086879+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.(*M).Run(0x3a0209b8c1e0)\n"}
-{"Time":"2026-10-25T15:34:38.066090269+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2602 +0x6af\n"}
-{"Time":"2026-10-25T15:34:38.066093429+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"main.main()\n"}
-{"Time":"2026-10-25T15:34:38.066097569+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t_testmain.go:48 +0x9b\n"}
-{"Time":"2026-10-25T15:34:38.066100639+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\n"}
-{"Time":"2026-10-25T15:34:38.066103769+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"goroutine 20 [sleep]:\n"}
-{"Time":"2026-10-25T15:34:38.066106969+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"time.Sleep(0xdf8475800)\n"}
-{"Time":"2026-10-25T15:34:38.066110279+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/runtime/time.go:368 +0x165\n"}
-{"Time":"2026-10-25T15:34:38.066113639+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"example.com/timeout.TestWaitsForever(0x3a0209bc8488?)\n"}
-{"Time":"2026-10-25T15:34:38.066117109+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/tmp/fix-1901b/timeout/p_test.go:12 +0x48\n"}
-{"Time":"2026-10-25T15:34:38.066120239+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"testing.tRunner(0x3a0209bc8488, 0x6d5b10)\n"}
-{"Time":"2026-10-25T15:34:38.066123509+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2195 +0xea\n"}
-{"Time":"2026-10-25T15:34:38.066126839+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"created by testing.(*T).Run in goroutine 1\n"}
-{"Time":"2026-10-25T15:34:38.066129989+01:00","Action":"output","Package":"example.com/timeout","Test":"TestWaitsForever","Output":"\t/usr/lib/go/src/testing/testing.go:2260 +0x4d4\n"}
-{"Time":"2026-10-25T15:34:38.066986453+01:00","Action":"output","Package":"example.com/timeout","Output":"FAIL\texample.com/timeout\t2.017s\n","OutputType":"frame"}
-{"Time":"2026-10-25T15:34:38.067002113+01:00","Action":"fail","Package":"example.com/timeout","Elapsed":2.017}

modules/mesh-build-go/cmd/mesh-build-go/testdata/captured/twofailing.json

@@ -0,0 +1,23 @@
+{"Time":"2026-10-24T23:45:37.721718705+02:00","Action":"start","Package":"fixture/twofailing/one"}
+{"Time":"2026-10-24T23:45:37.723685152+02:00","Action":"run","Package":"fixture/twofailing/one","Test":"TestOneIsTwo"}
+{"Time":"2026-10-24T23:45:37.723726472+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsTwo","Output":"=== RUN   TestOneIsTwo\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.723743682+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsTwo","Output":"    one_test.go:6: checking One\n"}
+{"Time":"2026-10-24T23:45:37.723750622+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsTwo","Output":"    one_test.go:8: One() = 1, want 2\n","OutputType":"error"}
+{"Time":"2026-10-24T23:45:37.723759302+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsTwo","Output":"--- FAIL: TestOneIsTwo (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.723889303+02:00","Action":"start","Package":"fixture/twofailing/two"}
+{"Time":"2026-10-24T23:45:37.723762972+02:00","Action":"fail","Package":"fixture/twofailing/one","Test":"TestOneIsTwo","Elapsed":0}
+{"Time":"2026-10-24T23:45:37.723952274+02:00","Action":"run","Package":"fixture/twofailing/one","Test":"TestOneIsOne"}
+{"Time":"2026-10-24T23:45:37.723955484+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsOne","Output":"=== RUN   TestOneIsOne\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.723959304+02:00","Action":"output","Package":"fixture/twofailing/one","Test":"TestOneIsOne","Output":"--- PASS: TestOneIsOne (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.723964914+02:00","Action":"pass","Package":"fixture/twofailing/one","Test":"TestOneIsOne","Elapsed":0}
+{"Time":"2026-10-24T23:45:37.723967704+02:00","Action":"output","Package":"fixture/twofailing/one","Output":"FAIL\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.724225126+02:00","Action":"output","Package":"fixture/twofailing/one","Output":"FAIL\tfixture/twofailing/one\t0.002s\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.724231936+02:00","Action":"fail","Package":"fixture/twofailing/one","Elapsed":0.003}
+{"Time":"2026-10-24T23:45:37.725752949+02:00","Action":"run","Package":"fixture/twofailing/two","Test":"TestTwoIsThree"}
+{"Time":"2026-10-24T23:45:37.725796309+02:00","Action":"output","Package":"fixture/twofailing/two","Test":"TestTwoIsThree","Output":"=== RUN   TestTwoIsThree\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.725808239+02:00","Action":"output","Package":"fixture/twofailing/two","Test":"TestTwoIsThree","Output":"    two_test.go:7: Two() = 2, want 3\n","OutputType":"error"}
+{"Time":"2026-10-24T23:45:37.72581671+02:00","Action":"output","Package":"fixture/twofailing/two","Test":"TestTwoIsThree","Output":"--- FAIL: TestTwoIsThree (0.00s)\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.72582026+02:00","Action":"fail","Package":"fixture/twofailing/two","Test":"TestTwoIsThree","Elapsed":0}
+{"Time":"2026-10-24T23:45:37.72582549+02:00","Action":"output","Package":"fixture/twofailing/two","Output":"FAIL\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.726319344+02:00","Action":"output","Package":"fixture/twofailing/two","Output":"FAIL\tfixture/twofailing/two\t0.002s\n","OutputType":"frame"}
+{"Time":"2026-10-24T23:45:37.726362544+02:00","Action":"fail","Package":"fixture/twofailing/two","Elapsed":0.002}

modules/mesh-build-go/cmd/mesh-build-go/testdata/repos/twofailing/go.mod

@@ -0,0 +1,3 @@
+module fixture/twofailing
+
+go 1.25.0

modules/mesh-build-go/cmd/mesh-build-go/testdata/repos/twofailing/one/one.go

@@ -0,0 +1,3 @@
+package one
+
+func One() int { return 1 }

modules/mesh-build-go/cmd/mesh-build-go/testdata/repos/twofailing/one/one_test.go

@@ -0,0 +1,16 @@
+package one
+
+import "testing"
+
+func TestOneIsTwo(t *testing.T) {
+	t.Log("checking One")
+	if One() != 2 {
+		t.Fatalf("One() = %d, want 2", One())
+	}
+}
+
+func TestOneIsOne(t *testing.T) {
+	if One() != 1 {
+		t.Fatal("one")
+	}
+}

modules/mesh-build-go/cmd/mesh-build-go/testdata/repos/twofailing/two/two.go

@@ -0,0 +1,3 @@
+package two
+
+func Two() int { return 2 }

modules/mesh-build-go/cmd/mesh-build-go/testdata/repos/twofailing/two/two_test.go

@@ -0,0 +1,9 @@
+package two
+
+import "testing"
+
+func TestTwoIsThree(t *testing.T) {
+	if Two() != 3 {
+		t.Errorf("Two() = %d, want 3", Two())
+	}
+}

modules/mesh-build-go/go.mod

@@ -3,7 +3,7 @@ module meshbuildgo
 go 1.26.0
 
 require (
-	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95
 	github.com/distribution/distribution/v3 v3.1.2
 	github.com/nats-io/nats-server/v2 v2.11.17
 	github.com/nats-io/nats.go v1.54.0

modules/mesh-build-go/go.sum

@@ -1,5 +1,13 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373 h1:Bykd8L6nHGNsvpHk3hLMeOct75UwlboHxasqB4cGKvQ=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024214154-bc16740feb0d h1:oJREw0ggKqJWJ5DEISSL0i2ZC5XqdXAidxo9NJ74TCc=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024214154-bc16740feb0d/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024225846-cb548a6a588c h1:GWHP9ozfkFXHVEL2gE4Xa5kc5e8uPO+UL9+mau6iaIs=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024225846-cb548a6a588c/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024230839-4a12ccb78d19 h1:NqU4hkk/jHdTEcGFnnXvdOJwD8dH5u+qWaCdQQ+JYMc=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024230839-4a12ccb78d19/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232250-9b408db24a58 h1:4Damtdqlf6u6nJhvMA99peDy1jmjixtcwFXJ4bWEkLk=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232250-9b408db24a58/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95 h1:I8zbgGzRjmgYydPTWo8hmaZW/P/g+qGDUfu3E32/pkU=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
 github.com/alicebob/miniredis/v2 v2.35.0 h1:QwLphYqCEAo1eu1TqPRN2jgVMPBweeQcR21jeqDCONI=
 github.com/alicebob/miniredis/v2 v2.35.0/go.mod h1:TcL7YfarKPGDAthEtl5NBeHZfeUQj6OXMm/+iu5cLMM=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op h1:Z/MZK75wC/NSrkgqeNIa7jexam9uWzhLmFTSCPI/kn0=

modules/mesh-build-image/cmd/mesh-build-image/asks.go

@@ -37,12 +37,8 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskImage}
 	}
 	capacity := m.Capacity
-	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
-	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
-	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
-		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
@@ -50,7 +46,7 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		load = func(key string) ([]byte, error) { return m.ReadSteps.Get(key) }
 	}
 	return &buildstep.Puller{Source: source, Language: delivery.AskImage, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
+		Capacity: capacity, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Check(ctx); err != nil {
 				return nil, err

modules/mesh-build-image/go.mod

@@ -3,7 +3,7 @@ module meshbuildimage
 go 1.26.0
 
 require (
-	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023213200-403a5d72ab93
 	github.com/nats-io/nats-server/v2 v2.11.17
 	github.com/nats-io/nats.go v1.54.0
 )

modules/mesh-build-image/go.sum

@@ -1,5 +1,5 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373 h1:Bykd8L6nHGNsvpHk3hLMeOct75UwlboHxasqB4cGKvQ=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023213200-403a5d72ab93 h1:FAiFY2KBKEoZSH49OZTt7/zRBIQxyl5g/KhYrpggbN4=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261023213200-403a5d72ab93/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op h1:Z/MZK75wC/NSrkgqeNIa7jexam9uWzhLmFTSCPI/kn0=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op/go.mod h1:FQyySiasQQM8735Ddel3MRojmy4dA1IqCeyJ5jmPMbI=
 github.com/google/go-tpm v0.9.8 h1:slArAR9Ft+1ybZu0lBwpSmpwhRXaa85hWtMinMyRAWo=

modules/mesh-build-node/cmd/mesh-build-node/asks.go

@@ -45,12 +45,8 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		source = buildstep.SeatAsks{Language: delivery.AskNode}
 	}
 	capacity := m.Capacity
-	// The capacity's own change wakes the puller (issue 1887): the runtime's watch of the config value as mesh-config
-	// resolved it; the settings file is read only when that watch cannot start. A test's Capacity is its own.
-	var watch func(string, func(stdio.ProvisionChange) error) error
 	if capacity == nil {
 		capacity = buildstep.NodeCapacity(m.Settings, buildstep.DefaultCapacities, m.Node, m.Say)
-		watch = buildstep.WatchConfigServed
 	}
 	ask := m.askSteps(steps)
 	var load func(string) ([]byte, error)
@@ -58,7 +54,7 @@ func (m *Module) Puller(steps []StepTool, source buildstep.AskSource) *buildstep
 		load = func(key string) ([]byte, error) { return m.ReadSteps.Get(key) }
 	}
 	return &buildstep.Puller{Source: source, Language: delivery.AskNode, Node: m.Node, Put: m.Steps, Load: load,
-		Capacity: capacity, WatchConfig: watch, Logf: m.Say,
+		Capacity: capacity, Logf: m.Say,
 		Run: func(ctx context.Context, a delivery.StepAsk) (any, error) {
 			if err := m.Prepare(ctx); err != nil {
 				return nil, err

modules/mesh-build-node/go.mod

@@ -3,7 +3,7 @@ module meshbuildnode
 go 1.26.0
 
 require (
-	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373
+	git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95
 	github.com/distribution/distribution/v3 v3.1.2
 	github.com/nats-io/nats.go v1.54.0
 )

modules/mesh-build-node/go.sum

@@ -1,5 +1,7 @@
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373 h1:Bykd8L6nHGNsvpHk3hLMeOct75UwlboHxasqB4cGKvQ=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024214154-bc16740feb0d h1:oJREw0ggKqJWJ5DEISSL0i2ZC5XqdXAidxo9NJ74TCc=
-git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261025164403-a8fbabbfc373/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024214154-bc16740feb0d/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95 h1:I8zbgGzRjmgYydPTWo8hmaZW/P/g+qGDUfu3E32/pkU=
+git.novox.be/novox/mesh-sdk/go v0.1.14-0.20261024232922-99407c37df95/go.mod h1:ouERNpZizzwZ0HLEtAypsY9FR20FyUgUYRni6J7kVCY=
 github.com/alicebob/miniredis/v2 v2.35.0 h1:QwLphYqCEAo1eu1TqPRN2jgVMPBweeQcR21jeqDCONI=
 github.com/alicebob/miniredis/v2 v2.35.0/go.mod h1:TcL7YfarKPGDAthEtl5NBeHZfeUQj6OXMm/+iu5cLMM=
 github.com/antithesishq/antithesis-sdk-go v0.7.0-default-no-op h1:Z/MZK75wC/NSrkgqeNIa7jexam9uWzhLmFTSCPI/kn0=

modules/nextcloud/client.ts

@@ -61,74 +61,10 @@ const ONLYOFFICE_KEYS: ReadonlyArray<readonly [occKey: string, configKey: string
 
 let saidOnlyOfficeNotGiven = false;
 
-/**
- * The one Nextcloud account the module makes and keeps for itself: the same name files/server.env
- * gives NEXTCLOUD_ADMIN_USER (novox/hq issue 1253). Only this account is ever repaired; a `user`
- * setting naming any other account is used as given and never written to.
- */
-export const MESH_ACCOUNT = "mesh-admin";
-
-/**
- * Nextcloud refused the mesh's own login on its OCS surface (HTTP 401), or throttled it after
- * refusals (HTTP 429, its brute-force protection). Said by its status and the account, never a
- * password; the events loop backs off on it instead of asking again every tick.
- */
-export class LoginRefusedError extends Error {
-  constructor(readonly status: number, readonly user: string, detail: string) {
-    super(`Nextcloud refused the login of ${user} (${status}${detail ? ": " + detail : ""})`);
-    this.name = "LoginRefusedError";
-  }
-}
-
-/** The OCS envelope's own message, the one line worth saying of a refusal; empty when none. */
-function ocsMessage(body: string): string {
-  const xml = /<message>([^<]*)<\/message>/.exec(body);
-  if (xml) return xml[1].trim();
-  try { return String(JSON.parse(body)?.ocs?.meta?.message ?? "").trim(); } catch { return ""; }
-}
-
-/**
- * How long to leave a failing poll alone: the base interval after the first failure, doubling on
- * each further one up to `maxMs`, and back to every tick once a poll passes. `due` says whether a
- * tick should poll; `failed` records a failure and answers whether it is the first of a run (said
- * loud) or the one that reached the ceiling (said once more), so a failure is never said every tick.
- */
-export class Backoff {
-  private delayMs = 0;
-  private nextAt = 0;
-  private failures = 0;
-
-  constructor(private readonly baseMs: number, private readonly maxMs: number) {}
-
-  due(now: number): boolean {
-    return now >= this.nextAt;
-  }
-
-  failed(now: number): { first: boolean; atCeiling: boolean; delayMs: number } {
-    this.failures += 1;
-    const before = this.delayMs;
-    this.delayMs = before === 0 ? this.baseMs : Math.min(before * 2, this.maxMs);
-    this.nextAt = now + this.delayMs;
-    return { first: this.failures === 1, atCeiling: this.delayMs === this.maxMs && before !== this.maxMs, delayMs: this.delayMs };
-  }
-
-  /** A poll passed; answers whether it ended a run of failures. */
-  passed(): boolean {
-    const wasFailing = this.failures > 0;
-    this.failures = 0;
-    this.delayMs = 0;
-    this.nextAt = 0;
-    return wasFailing;
-  }
-}
-
 export class NextcloudClient {
   // Whether the last connection check failed (novox/hq issue 1832): while it did, every tick runs
   // the check again, even when nothing changed, until it passes.
   private lastCheckFailed = false;
-  // Whether the account was already made right since the last accepted login (novox/hq issue
-  // 1253): a refusal makes it right once, and a refusal after that is said, not repaired again.
-  private accountMadeRight = false;
 
   constructor(
     private readonly container: string,
@@ -140,17 +76,15 @@ export class NextcloudClient {
   /**
    * Build from the module's resolved environment. occ needs only the container name (default
    * "nextcloud"); the OCS surface needs the admin password the module keeps as its own secret
-   * (MESH_NEXTCLOUD_ADMIN_PASSWORD, user MESH_NEXTCLOUD_ADMIN_USER default mesh-admin, URL the local
+   * (MESH_NEXTCLOUD_ADMIN_PASSWORD, user MESH_NEXTCLOUD_ADMIN_USER default admin, URL the local
    * container). The admin password is treated as the "configured for mesh administration" signal:
    * throws without it, and the module then contributes nothing rather than failing.
    */
   static fromEnv(env: NodeJS.ProcessEnv = process.env): NextcloudClient {
     const cfg = meshConfig(env.MESH_NEXTCLOUD_CONFIG_FILE);
-    // An empty setting is the manifest's "empty is the default", never an empty name.
+    const container = cfg.container ?? env.MESH_NEXTCLOUD_CONTAINER ?? "nextcloud";
-    const container = cfg.container || env.MESH_NEXTCLOUD_CONTAINER || "nextcloud";
+    const ocsUrl = cfg.url ?? env.MESH_NEXTCLOUD_URL ?? `http://127.0.0.1:${env.NEXTCLOUD_PORT ?? "80"}`;
-    const ocsUrl = cfg.url || env.MESH_NEXTCLOUD_URL || `http://127.0.0.1:${env.NEXTCLOUD_PORT ?? "80"}`;
+    const adminUser = cfg.user ?? env.MESH_NEXTCLOUD_ADMIN_USER ?? "admin";
-    // No "admin" fallback: that is what a hand-made install calls its human administrator.
-    const adminUser = cfg.user || env.MESH_NEXTCLOUD_ADMIN_USER || MESH_ACCOUNT;
     const passwordFile = env.MESH_NEXTCLOUD_ADMIN_PASSWORD_FILE;
     ignoreSecretSetting(cfg, "password");
     const adminPassword = env.MESH_NEXTCLOUD_ADMIN_PASSWORD
@@ -166,28 +100,20 @@ export class NextcloudClient {
    * Run occ inside the container as the web user, returning its stdout, throwing its own message.
    * With `opts.input` given, occ reads it from stdin (`docker exec -i`) instead of taking it on the
    * command line — the only way a secret value reaches occ without sitting in the docker CLI's argv,
-   * the container's php argv and docker's exec record (novox/hq issue 1831). With `opts.env` given,
+   * the container's php argv and docker's exec record (novox/hq issue 1831).
-   * each variable is passed by name alone (`docker exec -e NAME`), its value taken from the docker
-   * CLI's own environment, so it is on no argv either (occ's `--password-from-env` reads OC_PASS).
    */
-  occ(args: string[], opts: { input?: string; env?: Record<string, string> } = {}): string {
+  occ(args: string[], opts: { input?: string } = {}): string {
-    const dockerArgs = ["exec"];
+    const dockerArgs = opts.input !== undefined
-    if (opts.input !== undefined) dockerArgs.push("-i");
+      ? ["exec", "-i", "-u", "www-data", this.container, "php", "occ", ...args]
-    for (const name of Object.keys(opts.env ?? {})) dockerArgs.push("-e", name);
+      : ["exec", "-u", "www-data", this.container, "php", "occ", ...args];
-    dockerArgs.push("-u", "www-data", this.container, "php", "occ", ...args);
     try {
       return execFileSync("docker", dockerArgs, {
         encoding: "utf8", timeout: 60_000,
         ...(opts.input !== undefined ? { input: opts.input } : {}),
-        ...(opts.env ? { env: { ...process.env, ...opts.env } } : {}),
       }).trim();
     } catch (err: any) {
-      // occ writes many refusals ("user not found") to stdout with an empty stderr: say both.
+      const detail = String(err?.stderr ?? err?.stdout ?? err?.message ?? "").trim();
-      const detail = [err?.stderr, err?.stdout].map((x) => String(x ?? "").trim()).filter(Boolean).join("\n")
+      throw new Error(detail || `occ produced no output — is the ${this.container} container running?`);
-        || String(err?.message ?? "").trim();
-      // The exit status rides along, so a caller can tell occ's own answer from a failure.
-      throw Object.assign(new Error(detail || `occ produced no output — is the ${this.container} container running?`),
-        { status: typeof err?.status === "number" ? err.status : undefined });
     }
   }
 
@@ -262,75 +188,14 @@ export class NextcloudClient {
     return { enabled: Object.keys(parsed.enabled ?? {}), disabled: Object.keys(parsed.disabled ?? {}) };
   }
 
-  /**
+  /** List every share, over the OCS Sharing API with the admin credentials. */
-   * Makes the mesh's own account in Nextcloud match the module's own secret (novox/hq issue 1253).
+  async listShares(): Promise<NextcloudShare[]> {
-   * The image creates NEXTCLOUD_ADMIN_USER only when it installs a fresh instance, so an instance
-   * the mesh adopted never has it, and a secret made anew never reaches it. Only the module's own
-   * account (MESH_ACCOUNT) is touched: under any other name it writes nothing and throws
-   * LoginRefusedError. Through occ: whether the account exists is read from `user:info`, whose
-   * exit status 1 with "not found" means missing (user:list pages, so it is not asked); a missing
-   * one is added, an existing one gets its password set to the secret. It gets no admin group: the
-   * shares poll needs no admin rights (least privilege). The password goes by OC_PASS
-   * (`--password-from-env`), never on an argv. Nextcloud's brute-force record is left alone: it is
-   * shared by every client behind the same address, and the caller's back-off outlasts it. A
-   * failing occ is thrown as LoginRefusedError carrying occ's own message.
-   */
-  ensureAdminAccount(): "created" | "password-set" {
-    if (this.adminUser !== MESH_ACCOUNT) {
-      throw new LoginRefusedError(401, this.adminUser, `not repaired: only ${MESH_ACCOUNT}, the module's own account, is`);
-    }
-    const pass = { env: { OC_PASS: this.adminPassword } };
-    try {
-      if (!this.accountExists()) {
-        this.occ(["user:add", "--password-from-env", "--display-name=Mesh administration", this.adminUser], pass);
-        return "created";
-      }
-      this.occ(["user:resetpassword", "--password-from-env", this.adminUser], pass);
-      return "password-set";
-    } catch (err) {
-      throw new LoginRefusedError(401, this.adminUser, `repair failed: ${String((err as Error)?.message ?? err).split("\n")[0]}`);
-    }
-  }
-
-  /** Whether the account exists: occ user:info answers it, exit 1 and "not found" when missing. */
-  private accountExists(): boolean {
-    try {
-      this.occ(["user:info", this.adminUser, "--output=json"]);
-      return true;
-    } catch (err: any) {
-      if (err?.status === 1 && /not found/i.test(String(err?.message ?? ""))) return false;
-      throw err;
-    }
-  }
-
-  private fetchShares(): Promise<Response> {
     const auth = Buffer.from(`${this.adminUser}:${this.adminPassword}`).toString("base64");
-    return fetch(
+    const res = await fetch(
       `${this.ocsUrl}/ocs/v2.php/apps/files_sharing/api/v1/shares?format=json`,
       { headers: { Authorization: `Basic ${auth}`, "OCS-APIRequest": "true", Accept: "application/json" } },
     );
-  }
+    if (!res.ok) throw new Error(`Nextcloud OCS shares: ${res.status} ${await res.text()}`);
-
-  /**
-   * List every share, over the OCS Sharing API as the mesh's own account. A refused login (401)
-   * makes the account right once (ensureAdminAccount) and asks again; a refusal after that, or
-   * any throttle (429), throws LoginRefusedError, so the caller backs off (novox/hq issue 1253).
-   */
-  async listShares(): Promise<NextcloudShare[]> {
-    let res = await this.fetchShares();
-    // Only a refused login (401) is repaired. A throttle (429) is no evidence the password is
-    // wrong (anyone guessing passwords from the same address causes it): it is backed off only.
-    if (res.status === 401 && !this.accountMadeRight) {
-      await res.text();
-      this.accountMadeRight = true;
-      this.ensureAdminAccount();
-      res = await this.fetchShares();
-    }
-    if (res.status === 401 || res.status === 429) {
-      throw new LoginRefusedError(res.status, this.adminUser, ocsMessage(await res.text()));
-    }
-    if (!res.ok) throw new Error(`Nextcloud OCS shares: ${res.status} ${ocsMessage(await res.text())}`.trim());
-    this.accountMadeRight = false;
     const rows = ((await res.json())?.ocs?.data ?? []) as any[];
     return rows.map((s) => ({
       id: String(s.id),
@@ -341,32 +206,3 @@ export class NextcloudClient {
     }));
   }
 }
-
-/**
- * Runs one poll of the shares under a back-off (novox/hq issue 1253): skipped while backing off;
- * a LoginRefusedError is said loud at the first failure and once more when the wait reaches its
- * ceiling, never on every tick; one line says when it passes again. Other errors are thrown on,
- * so the loop logs them as before.
- */
-export async function pollSharesGuarded(
-  client: NextcloudClient,
-  backoff: Backoff,
-  poll: (c: NextcloudClient) => Promise<void>,
-  now: () => number = Date.now,
-): Promise<void> {
-  if (!backoff.due(now())) return;
-  try {
-    await poll(client);
-  } catch (err) {
-    if (!(err instanceof LoginRefusedError)) throw err;
-    const step = backoff.failed(now());
-    const minutes = Math.round(step.delayMs / 60_000);
-    if (step.first) {
-      console.error(`[nextcloud] shares: ${err.message}; not asking again for ${minutes} min, then less often, up to every hour`);
-    } else if (step.atCeiling) {
-      console.error(`[nextcloud] shares: ${err.message}, still; asking once an hour from now on`);
-    }
-    return;
-  }
-  if (backoff.passed()) console.log("[nextcloud] shares: the login is accepted again");
-}

modules/nextcloud/index.ts

@@ -9,7 +9,7 @@
 // existing user and share as freshly created.
 
 import { emit } from "@novox/mesh-sdk/events";
-import { Backoff, NextcloudClient, pollSharesGuarded } from "./client.js";
+import { NextcloudClient } from "./client.js";
 
 // Constructed lazily so an unconfigured node (no admin password) loads this entrypoint without
 // crashing the events host — it simply watches nothing.
@@ -69,11 +69,7 @@ if (nextcloud) {
     run();
   };
   tick(pollUsers);
-  // A refused login is said once and the shares are left alone for 5 minutes, doubling to an hour,
+  tick(pollShares);
-  // instead of a refusal every minute that Nextcloud's brute-force protection then throttles
-  // (novox/hq issue 1253).
-  const sharesBackoff = new Backoff(5 * 60_000, 60 * 60_000);
-  tick((c) => pollSharesGuarded(c, sharesBackoff, pollShares));
   tick(applyOnlyOffice);
   console.log("[nextcloud] watching users, shares and onlyoffice settings");
 }

modules/nextcloud/module.json

@@ -72,7 +72,7 @@
     },
     "user": {
       "type": "string",
-      "description": "The Nextcloud account the module's tools act as; empty is mesh-admin, the account the module makes and keeps for itself. Any other account is used as given and never repaired.",
+      "description": "The Nextcloud account the module's tools act as; empty is admin.",
       "trusted": true,
       "default": ""
     }

modules/nextcloud/test/admin-login.test.ts

@@ -1,305 +0,0 @@
-// novox/hq issue 1253: the module's own Nextcloud account is made to match its own secret when
-// Nextcloud refuses the login, and a refusal that stays is said once and backed off, never asked
-// again every minute into Nextcloud's brute-force throttle. Run against the compiled module, the
-// way the runtime loads it.
-
-import { test, mock } from "node:test";
-import assert from "node:assert/strict";
-import { chmodSync, mkdtempSync, readFileSync, writeFileSync } from "node:fs";
-import { tmpdir } from "node:os";
-import { join } from "node:path";
-
-import { Backoff, LoginRefusedError, NextcloudClient, pollSharesGuarded } from "../dist/client.js";
-
-const PASSWORD = "the-modules-own-secret";
-const REFUSED_XML = `<?xml version="1.0"?>\n<ocs>\n <meta>\n  <status>failure</status>\n  <statuscode>997</statuscode>\n  <message>Unauthorised</message>\n </meta>\n <data/>\n</ocs>\n`;
-const SHARES = { ocs: { data: [{ id: 7, path: "/Photos", share_type: 3, share_with: "", uid_owner: "jochens" }] } };
-
-function client(user = "mesh-admin"): any {
-  return new (NextcloudClient as any)("nextcloud", "http://127.0.0.1:20003", user, PASSWORD);
-}
-
-/** A stand-in Nextcloud: answers `statuses` in turn (the last one repeating) and counts the asks. */
-function standInFetch(statuses: number[]) {
-  let asked = 0;
-  const impl = async (): Promise<Response> => {
-    const status = statuses[Math.min(asked, statuses.length - 1)];
-    asked += 1;
-    if (status === 200) return new Response(JSON.stringify(SHARES), { status });
-    return new Response(REFUSED_XML, { status });
-  };
-  return { impl, asked: () => asked };
-}
-
-/** A stand-in occ: knows whether the account exists, records every call and every env passed. */
-function standInOcc(accountExists: boolean, opts: { failWrite?: string } = {}) {
-  const calls: string[][] = [];
-  const envs: Array<Record<string, string> | undefined> = [];
-  const impl = (args: string[], occOpts: { env?: Record<string, string> } = {}): string => {
-    calls.push(args);
-    envs.push(occOpts.env);
-    if (args[0] === "user:info") {
-      // As the real occ() throws it: occ's stdout as the message, its exit status alongside.
-      if (!accountExists) throw Object.assign(new Error("user not found"), { status: 1 });
-      return "{}";
-    }
-    if (["user:add", "user:resetpassword"].includes(args[0])) {
-      if (opts.failWrite) throw new Error(opts.failWrite);
-      return "";
-    }
-    throw new Error("unexpected occ call: " + args.join(" "));
-  };
-  return { calls, envs, impl };
-}
-
-/** The occ calls that write: anything but a read of the account. */
-const writes = (calls: string[][]) => calls.filter((a) => a[0] !== "user:info");
-
-// 1253/AC1: given an adopted instance without the mesh's account, when Nextcloud refuses the
-// login, then the account is added (no admin group) with the module's own secret, by OC_PASS and
-// never on an argv, and the shares are listed; Nextcloud's brute-force record is left alone.
-test("a refused login adds the missing account, password by environment, and lists the shares", async () => {
-  const c = client();
-  const occ = standInOcc(false);
-  mock.method(c, "occ", occ.impl);
-  const web = standInFetch([401, 200]);
-  const f = mock.method(globalThis, "fetch", web.impl);
-  try {
-    const shares = await c.listShares();
-    assert.equal(web.asked(), 2);
-    assert.deepEqual(shares.map((s: any) => s.id), ["7"]);
-    const add = occ.calls.find((a) => a[0] === "user:add");
-    assert.ok(add, "user:add ran");
-    assert.ok(add.includes("--password-from-env") && add.includes("mesh-admin"));
-    assert.ok(!add.some((a) => a.includes("group")), "no admin group: least privilege");
-    assert.deepEqual(occ.calls.map((a) => a[0]), ["user:info", "user:add"]);
-    assert.equal(occ.envs[occ.calls.indexOf(add)]?.OC_PASS, PASSWORD);
-    assert.ok(!occ.calls.flat().some((a) => a.includes(PASSWORD)), "the password is on no argv");
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC2: given the account exists with another password, when Nextcloud refuses the login,
-// then its password is set to the module's own secret, in no group.
-test("a refused login resets an existing account's password, in no group", async () => {
-  const c = client();
-  const occ = standInOcc(true);
-  mock.method(c, "occ", occ.impl);
-  const f = mock.method(globalThis, "fetch", standInFetch([401, 200]).impl);
-  try {
-    await c.listShares();
-    assert.deepEqual(occ.calls.map((a) => a[0]), ["user:info", "user:resetpassword"]);
-    assert.equal(occ.envs[1]?.OC_PASS, PASSWORD);
-    assert.ok(!occ.calls.flat().some((a) => a.includes(PASSWORD)));
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC3: given the login is still refused after the account was made right, then
-// listShares throws LoginRefusedError naming the status and the account, never the password or
-// the whole XML, and a later call does not repair the account again.
-test("a refusal after the repair throws LoginRefusedError once-repaired, short and without the password", async () => {
-  const c = client();
-  const occ = standInOcc(true);
-  mock.method(c, "occ", occ.impl);
-  const web = standInFetch([401]);
-  const f = mock.method(globalThis, "fetch", web.impl);
-  try {
-    await assert.rejects(c.listShares(), (err: any) => {
-      assert.ok(err instanceof LoginRefusedError);
-      assert.equal(err.status, 401);
-      assert.equal(err.message, "Nextcloud refused the login of mesh-admin (401: Unauthorised)");
-      assert.ok(!err.message.includes(PASSWORD));
-      return true;
-    });
-    await assert.rejects(c.listShares(), LoginRefusedError);
-    assert.equal(occ.calls.filter((a) => a[0] === "user:resetpassword").length, 1, "repaired once");
-    assert.equal(web.asked(), 3);
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC3b: a throttle (429) is no evidence the password is wrong: two cycles of 429 then 200
-// run no occ write, and the 429s are LoginRefusedError for the back-off.
-test("a throttle (429) is backed off, never repaired", async () => {
-  const c = client();
-  const occ = standInOcc(true);
-  mock.method(c, "occ", occ.impl);
-  const f = mock.method(globalThis, "fetch", standInFetch([429, 200, 429, 200]).impl);
-  try {
-    for (let cycle = 0; cycle < 2; cycle++) {
-      await assert.rejects(c.listShares(), (err: any) => err instanceof LoginRefusedError && err.status === 429);
-      assert.equal((await c.listShares()).length, 1);
-    }
-    assert.deepEqual(occ.calls, [], "no occ call at all, so no write");
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC3c: a 401 runs exactly one repair.
-test("a 401 runs exactly one repair", async () => {
-  const c = client();
-  const occ = standInOcc(true);
-  mock.method(c, "occ", occ.impl);
-  const f = mock.method(globalThis, "fetch", standInFetch([401, 200]).impl);
-  try {
-    await c.listShares();
-    assert.equal(writes(occ.calls).length, 1);
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC4: given the login stays refused, when the loop ticks every minute, then the refusal
-// is said once, the shares are asked only after 5, 10, 20, 40 and then every 60 minutes, the
-// ceiling is said once more, and one line says when the login is accepted again.
-test("a refusal that stays is said once, backed off to an hour, and its end is said", async () => {
-  const said: string[] = [];
-  const err = mock.method(console, "error", (...a: unknown[]) => { said.push(a.join(" ")); });
-  const log = mock.method(console, "log", (...a: unknown[]) => { said.push(a.join(" ")); });
-  try {
-    let refused = true;
-    let polls = 0;
-    const askedAt: number[] = [];
-    let clock = 0;
-    const poll = async (): Promise<void> => {
-      polls += 1;
-      askedAt.push(clock / 60_000);
-      if (refused) throw new LoginRefusedError(401, "mesh-admin", "Unauthorised");
-    };
-    const backoff = new Backoff(5 * 60_000, 60 * 60_000);
-    for (let minute = 0; minute <= 200; minute++) {
-      clock = minute * 60_000;
-      await pollSharesGuarded({} as any, backoff, poll, () => clock);
-    }
-    assert.deepEqual(askedAt, [0, 5, 15, 35, 75, 135, 195]);
-    assert.equal(said.length, 2, said.join("\n"));
-    assert.match(said[0], /refused the login of mesh-admin \(401: Unauthorised\); not asking again for 5 min/);
-    assert.match(said[1], /still; asking once an hour/);
-
-    refused = false;
-    clock = 260 * 60_000;
-    await pollSharesGuarded({} as any, backoff, poll, () => clock);
-    assert.equal(said[2], "[nextcloud] shares: the login is accepted again");
-    const before = polls;
-    clock += 60_000;
-    await pollSharesGuarded({} as any, backoff, poll, () => clock);
-    assert.equal(polls, before + 1, "every tick again once it passes");
-    assert.equal(said.length, 3);
-  } finally {
-    err.mock.restore();
-    log.mock.restore();
-  }
-});
-
-// 1253/AC5: occ passes an environment variable by name alone, its value through the docker
-// CLI's environment, so the password is on no argv.
-test("occ passes OC_PASS by name, its value only in docker's environment", () => {
-  const dir = mkdtempSync(join(tmpdir(), "nextcloud-1253-"));
-  const record = join(dir, "record");
-  writeFileSync(join(dir, "docker"), `#!/bin/sh\nprintf '%s\\n' "$*" > ${record}\nprintf '%s' "$OC_PASS" >> ${record}\n`);
-  chmodSync(join(dir, "docker"), 0o755);
-  const path = process.env.PATH;
-  process.env.PATH = `${dir}:${path}`;
-  try {
-    client().occ(["user:resetpassword", "--password-from-env", "mesh-admin"], { env: { OC_PASS: PASSWORD } });
-  } finally {
-    process.env.PATH = path;
-  }
-  const [argv, env] = readFileSync(record, "utf8").split("\n");
-  assert.equal(argv, "exec -e OC_PASS -u www-data nextcloud php occ user:resetpassword --password-from-env mesh-admin");
-  assert.equal(env, PASSWORD);
-});
-
-// 1253/AC6: an empty setting is the manifest's default, never an empty account name.
-test("an empty user setting falls back to the manifest's account", () => {
-  const dir = mkdtempSync(join(tmpdir(), "nextcloud-1253-"));
-  writeFileSync(join(dir, "config.json"), JSON.stringify({ user: "", container: "", url: "" }));
-  writeFileSync(join(dir, "admin.secret"), PASSWORD);
-  const c: any = NextcloudClient.fromEnv({
-    MESH_NEXTCLOUD_CONFIG_FILE: join(dir, "config.json"),
-    MESH_NEXTCLOUD_ADMIN_PASSWORD_FILE: join(dir, "admin.secret"),
-    MESH_NEXTCLOUD_ADMIN_USER: "mesh-admin",
-    MESH_NEXTCLOUD_URL: "http://127.0.0.1:20003",
-  });
-  assert.equal(c.adminUser, "mesh-admin");
-  assert.equal(c.container, "nextcloud");
-  assert.equal(c.ocsUrl, "http://127.0.0.1:20003");
-});
-
-// 1253/AC7: the repair touches only the module's own account: a refusal under a user setting
-// naming another account (the operator's) runs no occ write and throws LoginRefusedError.
-test("a refusal under another account's name writes nothing", async () => {
-  const c = client("jochens");
-  const occ = standInOcc(true);
-  mock.method(c, "occ", occ.impl);
-  const web = standInFetch([401]);
-  const f = mock.method(globalThis, "fetch", web.impl);
-  try {
-    await assert.rejects(c.listShares(), (err: any) => {
-      assert.ok(err instanceof LoginRefusedError);
-      assert.match(err.message, /refused the login of jochens .*not repaired: only mesh-admin/);
-      return true;
-    });
-    assert.deepEqual(writes(occ.calls), []);
-  } finally {
-    f.mock.restore();
-  }
-});
-
-// 1253/AC8: a repair whose occ write fails is said as a LoginRefusedError carrying occ's own
-// message, so the back-off's one loud line says why.
-test("a failing repair carries occ's message into LoginRefusedError", async () => {
-  const c = client();
-  mock.method(c, "occ", standInOcc(false, { failWrite: "The password policy refused the password" }).impl);
-  const f = mock.method(globalThis, "fetch", standInFetch([401]).impl);
-  try {
-    await assert.rejects(c.listShares(), (err: any) =>
-      err instanceof LoginRefusedError && /repair failed: The password policy refused the password/.test(err.message));
-  } finally {
-    f.mock.restore();
-  }
-});
-
-/** A fake docker on PATH: answers occ like Nextcloud (user:info's refusal on stdout, exit 1). */
-function fakeDocker(): { dir: string; record: string } {
-  const dir = mkdtempSync(join(tmpdir(), "nextcloud-1253-docker-"));
-  const record = join(dir, "record");
-  writeFileSync(join(dir, "docker"), [
-    "#!/bin/sh",
-    `printf '%s\\n' "$*" >> ${record}`,
-    'case "$*" in',
-    "  *' occ user:info '*) echo 'user not found'; exit 1 ;;",
-    "esac",
-    "exit 0",
-    "",
-  ].join("\n"));
-  chmodSync(join(dir, "docker"), 0o755);
-  return { dir, record };
-}
-
-function withPath<T>(dir: string, fn: () => T): T {
-  const path = process.env.PATH;
-  process.env.PATH = `${dir}:${path}`;
-  try { return fn(); } finally { process.env.PATH = path; }
-}
-
-// 1253/AC9: occ's own refusal on stdout with an empty stderr reaches the error, and the real
-// occ() through a docker answering like Nextcloud makes the missing account.
-test("occ says a refusal printed on stdout, and the real occ makes the missing account", () => {
-  const docker = fakeDocker();
-  const c = new (NextcloudClient as any)("nextcloud", "http://127.0.0.1:20003", "mesh-admin", PASSWORD);
-  withPath(docker.dir, () => {
-    assert.throws(() => c.occ(["user:info", "mesh-admin", "--output=json"]), /user not found/);
-    const did = c.ensureAdminAccount();
-    assert.equal(did, "created");
-  });
-  const lines = readFileSync(docker.record, "utf8").trim().split("\n");
-  assert.ok(lines.some((l) => l.endsWith("php occ user:add --password-from-env --display-name=Mesh administration mesh-admin")), lines.join("\n"));
-  assert.ok(!lines.some((l) => l.includes("bruteforce")), "the brute-force record is left alone");
-  assert.ok(!lines.join("\n").includes(PASSWORD));
-});