A stub keeps its items and their templates, so a held module still contributes to other modules' collections; it drops only the templates for its own files (issue 1126)

go/compose/composed.go

@@ -318,10 +318,15 @@ func Stub(m catalogue.Manifest) catalogue.Manifest {
 		m.OwnsPaths = catalogue.DeclaredPaths(m)
 	}
 	m.Build = nil
-	// Nor is anything of its own handed or collected: the templates and items its build kept fill resources and items a
+	// Nor is a template its build kept for its own files handed: a stub carries none of them (issue 1126: novox's node
-	// stub does not have (issue 1126: novox's node refused "postgres: its build kept a template for consumers, which it
+	// refused "postgres: its build kept a template for consumers, which it does not declare" with postgres held). Its
-	// does not declare" with postgres held).
+	// items stay, and the templates they render through: a held module's contributions to other modules' collections
-	m.Handed, m.Items = nil, nil
+	// (seat contributions, shell blocks, seat data) still reach their collectors.
+	if m.Handed != nil {
+		h := *m.Handed
+		h.Templates = nil
+		m.Handed = &h
+	}
 	var dirs []map[string]any
 	for _, r := range m.Resources {
 		if r["type"] == "directory" {

go/compose/frombus/answer_rows_test.go

@@ -294,13 +294,30 @@ func answerNamesEveryRefusalAndLeavesAnOldBuildToTheNode(t *testing.T) {
 	if got, want := catalogue.DeclaredPaths(compose.Carried(f1, "f1-circuits", &f1runs)), catalogue.DeclaredPaths(f1); !reflect.DeepEqual(got, want) {
 		t.Errorf("f1-circuits carried owns %v, want what the controller composes from its manifest, %v", got, want)
 	}
-	// Issue 1126: a held module hands and collects nothing of its own, so a template its build kept for a file it no
+	// Issue 1126: a held module hands no template its build kept for a file it no longer carries (novox's node:
-	// longer carries refuses nothing (novox's node: "postgres: its build kept a template for consumers").
+	// "postgres: its build kept a template for consumers"), but keeps its items and their templates, so what it
-	kept := f1
+	// contributes to other modules' collections still reaches them.
-	kept.Handed = &catalogue.Handed{Templates: map[string]string{"consumers": "files/consumers.json"}}
+	for _, row := range []struct {
-	kept.Items = []catalogue.Item{{Collection: "routes", Content: "x"}}
+		name   string
-	if st := compose.Stub(kept); st.Handed != nil || st.Items != nil {
+		handed *catalogue.Handed
-		t.Errorf("a stub hands %+v and collects %+v", st.Handed, st.Items)
+		items  []catalogue.Item
+	}{
+		{"templates and items", &catalogue.Handed{Templates: map[string]string{"consumers": "files/consumers.json"},
+			Items: map[string]string{"routes": "files/routes.tmpl"}}, []catalogue.Item{{Collection: "routes", Content: "x"}}},
+		{"items alone", nil, []catalogue.Item{{Collection: "routes", Content: "x"}}},
+	} {
+		kept := f1
+		kept.Handed, kept.Items = row.handed, row.items
+		st := compose.Stub(kept)
+		if st.Handed != nil && st.Handed.Templates != nil {
+			t.Errorf("%s: a stub hands templates %v", row.name, st.Handed.Templates)
+		}
+		if !reflect.DeepEqual(st.Items, row.items) {
+			t.Errorf("%s: a stub collects %+v, want its items %+v", row.name, st.Items, row.items)
+		}
+		if row.handed != nil && (st.Handed == nil || !reflect.DeepEqual(st.Handed.Items, row.handed.Items) || row.handed.Templates == nil) {
+			t.Errorf("%s: a stub hands item templates %+v, want %v and its manifest untouched", row.name, st.Handed, row.handed.Items)
+		}
 	}
 	var k1, k2 any
 	_ = json.Unmarshal(keptComposed, &k1)