Ensure daemon autostart lock dir exists (#1037)

Co-authored-by: OpenAI Codex <codex@openai.com>

cmd/bd/daemon_autostart.go

@@ -215,6 +215,11 @@ func isDaemonHealthy(socketPath string) bool {
 }
 
 func acquireStartLock(lockPath, socketPath string) bool {
+	if err := ensureLockDirectory(lockPath); err != nil {
+		debugLog("failed to ensure lock directory: %v", err)
+		return false
+	}
+
 	// nolint:gosec // G304: lockPath is derived from secure beads directory
 	lockFile, err := os.OpenFile(lockPath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0600)
 	if err != nil {
@@ -309,6 +314,21 @@ func determineSocketPath(socketPath string) string {
 	return socketPath
 }
 
+// ensureLockDirectory ensures the parent directory exists for the lock file.
+// Needed when ShortSocketPath routes sockets into /tmp/beads-*/bd.sock.
+func ensureLockDirectory(lockPath string) error {
+	dir := filepath.Dir(lockPath)
+	if dir == "" {
+		return fmt.Errorf("lock directory missing for %s", lockPath)
+	}
+	if _, err := os.Stat(dir); err == nil {
+		return nil
+	} else if !os.IsNotExist(err) {
+		return err
+	}
+	return os.MkdirAll(dir, 0o700)
+}
+
 func startDaemonProcess(socketPath string) bool {
 	// Early check: daemon requires a git repository (unless --local mode)
 	// Skip attempting to start and avoid the 5-second wait if not in git repo

cmd/bd/daemon_autostart_unit_test.go

@@ -127,6 +127,24 @@ func TestDaemonAutostart_AcquireStartLock_CreatesAndCleansStale(t *testing.T) {
 	}
 }
 
+func TestDaemonAutostart_AcquireStartLock_CreatesMissingDir(t *testing.T) {
+	tmpDir := t.TempDir()
+	socketPath := filepath.Join(tmpDir, "missing", "bd.sock")
+	lockPath := socketPath + ".startlock"
+
+	if _, err := os.Stat(filepath.Dir(lockPath)); !os.IsNotExist(err) {
+		t.Fatalf("expected lock dir to be missing before test, got: %v", err)
+	}
+
+	if !acquireStartLock(lockPath, socketPath) {
+		t.Fatalf("expected acquireStartLock to succeed when directory missing")
+	}
+
+	if _, err := os.Stat(lockPath); err != nil {
+		t.Fatalf("expected lock file to exist, stat error: %v", err)
+	}
+}
+
 func TestDaemonAutostart_SocketHealthAndReadiness(t *testing.T) {
 	socketPath, cleanup := startTestRPCServer(t)
 	defer cleanup()