fix: implicit parents hiding explicit paths

internal/slicer/slicer.go

@@ -35,6 +35,9 @@ type pathData struct {
 	until    setup.PathUntil
 	mutable  bool
 	hardLink bool
+	// implicit is set when the path is only known as the parent of another
+	// known path and no slice has listed it yet.
+	implicit bool
 }
 
 type contentChecker struct {
@@ -439,12 +442,12 @@ func addKnownPath(knownPaths map[string]pathData, path string, data pathData) {
 		slashPath += "/"
 	}
 	for {
-		if _, ok := knownPaths[slashPath]; ok {
+		if old, ok := knownPaths[slashPath]; ok && !old.implicit {
 			break
 		}
 		knownPaths[slashPath] = data
-		// The parents have empty data.
-		data = pathData{}
+		// The parents have empty data until a slice lists them explicitly.
+		data = pathData{implicit: true}
 		cleanPath = filepath.Dir(cleanPath)
 		if cleanPath == "/" {
 			break

internal/slicer/slicer_test.go

@@ -517,6 +517,38 @@ var slicerTests = []slicerTest{{
 	manifestPaths: map[string]string{
 		"/dir/nested/file-copy": "file 0644 cc55e2ec {test-package_myslice}",
 	},
+}, {
+	summary: "Script: 'until' on a made directory that is also an implicit parent",
+	slices:  []setup.SliceKey{{"test-package", "myslice"}},
+	release: map[string]string{
+		"slices/mydir/test-package.yaml": `
+			package: test-package
+			slices:
+				myslice:
+					contents:
+						/dir/: {make: true, until: mutate}
+						/dir/file: {until: mutate}
+		`,
+	},
+	// Extracting /dir/file registers /dir/ as an implicit parent before the
+	// generated content is created, which must not hide the explicit entry.
+	filesystem:    map[string]string{},
+	manifestPaths: map[string]string{},
+}, {
+	summary: "Script: 'until' on a generated directory and its generated child",
+	slices:  []setup.SliceKey{{"test-package", "myslice"}},
+	release: map[string]string{
+		"slices/mydir/test-package.yaml": `
+			package: test-package
+			slices:
+				myslice:
+					contents:
+						/gen/: {make: true, until: mutate}
+						/gen/text: {text: data1, until: mutate}
+		`,
+	},
+	filesystem:    map[string]string{},
+	manifestPaths: map[string]string{},
 }, {
 	summary: "Script: writing same contents to existing file does not set the final hash in report",
 	slices:  []setup.SliceKey{{"test-package", "myslice"}},