fix(virtfs): support Each() with non-template directory names

Each('peer', ...) creates a named directory whose children come from
Bindings(). Previously, listDir and findChild only checked Bindings
for template names like {foo}. Now they also handle directories that
have Bindings but no Children.

This fixes the peer/ directory in olliesrv which was listing empty
even though peers were configured via peeradd.

Added test for the non-template Each pattern.

virtfs/builder.go

@@ -125,6 +125,27 @@ func build(d *FsNodeDecl, parentUid, parentGid string) *Tree {
 
 func listDir(d *FsNodeDecl, uid, gid string) ([]os.DirEntry, error) {
 	var entries []os.DirEntry
+
+	// If this directory has Bindings (from Each), enumerate them directly.
+	if d.Bindings != nil && len(d.Children) == 0 {
+		nodes, err := d.Bindings()
+		if err != nil {
+			return nil, err
+		}
+		for _, n := range nodes {
+			m := n.Mode
+			if m == 0 {
+				m = d.Mode
+			}
+			if len(n.Children) > 0 || n.Bindings != nil {
+				entries = append(entries, dirEntry(n.Name, 0755))
+			} else {
+				entries = append(entries, fileEntry(n.Name, m))
+			}
+		}
+		return entries, nil
+	}
+
 	for _, c := range d.Children {
 		if isTemplateName(c.Name) {
 			if c.Bindings != nil {
@@ -355,6 +376,21 @@ func findChild(d *FsNodeDecl, name string) *FsNodeDecl {
 		return findChild(child, rest)
 	}
 
+	// If this directory has Bindings and no Children (from Each with non-template name),
+	// look up children in the bindings directly.
+	if d.Bindings != nil && len(d.Children) == 0 {
+		entries, err := d.Bindings()
+		if err != nil {
+			return nil
+		}
+		for i := range entries {
+			if entries[i].Name == name || matchAlias(entries[i].Aliases, name) {
+				return &entries[i]
+			}
+		}
+		return nil
+	}
+
 	// Static children.
 	for i := range d.Children {
 		if !isTemplateName(d.Children[i].Name) && d.Children[i].Name == name {

virtfs/decl_test.go

@@ -668,6 +668,66 @@ func TestNestedPath(t *testing.T) {
 	}
 }
 
+// ══════════════════════════════════════════════════════════════════
+// Each with non-template name (like "peer/")
+// ══════════════════════════════════════════════════════════════════
+
+func TestEachNonTemplateName(t *testing.T) {
+	// This tests the pattern used by peer/ in olliesrv:
+	// Each("peer", ...) creates a directory whose children come from Bindings
+	writeData := ""
+	spec := DirNode("/",
+		Each("peer", func() ([]FsNodeDecl, error) {
+			return []FsNodeDecl{
+				{Name: "alice", Mode: 0222, Write: func(data []byte) error { writeData = string(data); return nil }},
+				{Name: "bob", Mode: 0222, Write: func(data []byte) error { writeData = string(data); return nil }},
+			}, nil
+		}),
+	)
+
+	tree := BuildTree(spec)
+
+	// List root should show "peer" as a directory
+	entries, err := tree.List()
+	if err != nil {
+		t.Fatalf("List root: %v", err)
+	}
+	if len(entries) != 1 {
+		t.Fatalf("got %d root entries, want 1", len(entries))
+	}
+	if entries[0].Name() != "peer" || !entries[0].IsDir() {
+		t.Errorf("root entry = %v (dir=%v), want peer dir", entries[0].Name(), entries[0].IsDir())
+	}
+
+	// List peer/ should show alice and bob
+	entries, err = tree.Readdir("peer")
+	if err != nil {
+		t.Fatalf("Readdir peer: %v", err)
+	}
+	if len(entries) != 2 {
+		t.Fatalf("got %d peer entries, want 2", len(entries))
+	}
+	names := map[string]bool{}
+	for _, e := range entries {
+		names[e.Name()] = true
+	}
+	if !names["alice"] || !names["bob"] {
+		t.Errorf("peer entries = %v, want alice and bob", entries)
+	}
+
+	// Open and write to peer/alice
+	f, err := tree.Open("peer/alice")
+	if err != nil {
+		t.Fatalf("Open peer/alice: %v", err)
+	}
+	if err := f.Write([]byte("hello")); err != nil {
+		t.Fatalf("Write: %v", err)
+	}
+	if writeData != "hello" {
+		t.Errorf("writeData = %q, want hello", writeData)
+	}
+}
+
 // ══════════════════════════════════════════════════════════════════
 // GenerateHelp test
 // ══════════════════════════════════════════════════════════════════