Merge pull request 'Refuse an unmet seat dependency the catalogue could meet (hq ADR 0207 §4)' (#266) from feat/0207-refuse-unmet-seat-dependencies into main

cmd/mesh-controller/seat_dependencies_test.go

@@ -105,6 +105,8 @@ func TestUnassigningTheLastHolderUnderItsDependentsIsRefused(t *testing.T) {
 }
 
 func TestStatusReportsAnUnheldDependencyWithoutRefusingTheMachine(t *testing.T) {
+	// The mesh as it ran before the switch (novox/hq ADR 0207 §4).
+	defer catalogue.EnforcingSeatDependencies(false)()
 	open := aMesh(t)
 	ctx := t.Context()
 	register(t, open, serviceManagerHolder())

internal/catalogue/resolve.go

@@ -675,9 +675,14 @@ func Resolve(catalogue map[string]Manifest, assigned []string, node Node, world
 	// Reported until the switch; refused after it, though never in the first pass, whose refusals
 	// make a machine vanish from the network rather than report anything.
 	resolution.Unheld = UnheldDependencies(catalogue, node.Name, resolution.Modules, nil)
+	// Only a dependency some module in the catalogue could meet is refused: one with no possible
+	// holder has no remedy to name, and stays a report in `status` (novox/hq ADR 0207 §4, read with
+	// the assign rule above it).
 	if enforceSeatDependencies && !world.Unchecked {
 		for _, u := range resolution.Unheld {
-			problems = append(problems, u.String())
+			if len(u.Holders) > 0 {
+				problems = append(problems, u.String())
+			}
 		}
 	}
 

internal/catalogue/seat_dependencies.go

@@ -39,8 +39,19 @@ var appliedThrough = map[string]string{
 // which is when the three holders are assigned to every node: switching it before then would stop
 // every machine lacking one from being sent anything at all.
 //
+// Switched on 2026-10-04, when `status` first reported no unmet dependency on any node: systemd,
+// pacman and docker were assigned to all four machines that afternoon (novox/hq to-be 42).
+//
 // A variable rather than a constant only so a test can hold both behaviours; nothing else sets it.
-var enforceSeatDependencies = false
+var enforceSeatDependencies = true
+
+// EnforcingSeatDependencies sets the switch and returns what puts it back. For tests in other
+// packages that hold the behaviour from before the switch; nothing else calls it.
+func EnforcingSeatDependencies(on bool) (restore func()) {
+	was := enforceSeatDependencies
+	enforceSeatDependencies = on
+	return func() { enforceSeatDependencies = was }
+}
 
 // foundationModules are the pieces genesis lays before any module exists (novox/hq ADR 0207 §5):
 // the host and the private network. Registered as modules so they can be assigned, but what they
@@ -207,8 +218,8 @@ func manifestsOf(catalogue map[string]Manifest, names []string) []Manifest {
 // **A dependency nothing in the catalogue can meet is said, not refused.** A refusal names the
 // module that would meet it; with none registered there is no remedy to name, and refusing would
 // stop every assignment of that kind until a module that does not exist yet is written. The answer
-// still says it, and `status` reports it, until the switch (enforceSeatDependencies) makes the mesh
+// still says it, and `status` reports it — before the switch and after it alike: there is never a
-// refuse what it cannot meet. The first return is those lines.
+// remedy to name for it. The first return is those lines.
 func AssignRefusal(catalogue map[string]Manifest, node string, assigned, adding []string) ([]string, error) {
 	set := manifestsOf(catalogue, append(append([]string(nil), assigned...), adding...))
 	judged := map[string]bool{}
@@ -217,7 +228,7 @@ func AssignRefusal(catalogue map[string]Manifest, node string, assigned, adding
 	}
 	var refused, said []string
 	for _, u := range UnheldDependencies(catalogue, node, set, judged) {
-		if len(u.Holders) == 0 && !enforceSeatDependencies {
+		if len(u.Holders) == 0 {
 			said = append(said, u.String())
 			continue
 		}

internal/catalogue/seat_dependencies_test.go

@@ -120,24 +120,25 @@ func TestAnAssignmentMissingAHolderIsRefusedNamingTheSeatAndItsPossibleHolders(t
 	}
 }
 
-func TestADependencyNoCatalogueModuleCanMeetIsSaidNotRefusedUntilTheSwitch(t *testing.T) {
+func TestADependencyNoCatalogueModuleCanMeetIsSaidNeverRefused(t *testing.T) {
 	// No runtime module in the catalogue: refusing would stop every container's assignment until one
-	// is written, with no remedy to name.
+	// is written, with no remedy to name — so it is said, with the switch on as with it off.
 	web := withResources(mod("web", nil, nil, nil), res("container", "web"))
 	cat := shelf(web)
-	said, err := AssignRefusal(cat, "workstation", nil, []string{"web"})
+	for _, on := range []bool{false, true} {
-	if err != nil {
+		enforceSeatDependencies = on
-		t.Fatalf("a dependency nothing could meet was refused: %v", err)
+		said, err := AssignRefusal(cat, "workstation", nil, []string{"web"})
+		if err != nil {
+			t.Fatalf("switch %v: a dependency nothing could meet was refused: %v", on, err)
+		}
+		if len(said) != 1 || !strings.Contains(said[0], "no module in the catalogue claims it yet") {
+			t.Errorf("switch %v: the assignment does not say what it depends on: %v", on, said)
+		}
+		if _, err := Resolve(cat, []string{"web"}, workstation(), World{}); err != nil {
+			t.Errorf("switch %v: a dependency nothing could meet refused the node: %v", on, err)
+		}
 	}
-	if len(said) != 1 || !strings.Contains(said[0], "no module in the catalogue claims it yet") {
-		t.Errorf("the assignment does not say what it depends on: %v", said)
-	}
-
 	enforceSeatDependencies = true
-	defer func() { enforceSeatDependencies = false }()
-	if _, err := AssignRefusal(cat, "workstation", nil, []string{"web"}); err == nil {
-		t.Error("with the switch on, a dependency nothing could meet was not refused")
-	}
 }
 
 func TestTheHoldersMutualDependenceResolvesWhenAssignedTogether(t *testing.T) {
@@ -165,6 +166,9 @@ func TestTheHoldersMutualDependenceResolvesWhenAssignedTogether(t *testing.T) {
 }
 
 func TestStatusIsToldOfAnUnmetDependencyAndTheNodeStillResolves(t *testing.T) {
+	// Before the switch (the state the mesh ran in until every node held the three seats).
+	enforceSeatDependencies = false
+	defer func() { enforceSeatDependencies = true }()
 	web := withResources(mod("web", nil, nil, nil), res("container", "web"))
 	cat := shelf(append(coreThree(), web)...)
 	got, err := Resolve(cat, []string{"web"}, workstation(), World{})
@@ -179,7 +183,7 @@ func TestStatusIsToldOfAnUnmetDependencyAndTheNodeStillResolves(t *testing.T) {
 
 func TestWithTheSwitchFlippedAnUnmetDependencyRefusesTheNode(t *testing.T) {
 	enforceSeatDependencies = true
-	defer func() { enforceSeatDependencies = false }()
+	defer func() { enforceSeatDependencies = true }()
 	web := withResources(mod("web", nil, nil, nil), res("container", "web"))
 	cat := shelf(append(coreThree(), web)...)
 	_, err := Resolve(cat, []string{"web"}, workstation(), World{})