Fix debug logging for subprocess tests.

samples/mount_sample/mount.go

@@ -40,6 +40,7 @@ var fFlushError = flag.Int("flushfs.flush_error", 0, "")
 var fFsyncError = flag.Int("flushfs.fsync_error", 0, "")
 
 var fReadOnly = flag.Bool("read_only", false, "Mount in read-only mode.")
+var fDebug = flag.Bool("debug", false, "Enable debug logging.")
 
 func makeFlushFS() (server fuse.Server, err error) {
 	// Check the flags.
@@ -140,6 +141,10 @@ func main() {
 		ReadOnly: *fReadOnly,
 	}
 
+	if *fDebug {
+		cfg.DebugLogger = log.New(os.Stderr, "fuse: ", 0)
+	}
+
 	mfs, err := fuse.Mount(*fMountPoint, server, cfg)
 	if err != nil {
 		log.Fatalf("Mount: %v", err)

samples/subprocess.go

@@ -276,7 +276,7 @@ func (t *SubprocessTest) initialize(ctx context.Context) (err error) {
 	// Handle debug mode.
 	if *fDebug {
 		mountCmd.Stderr = os.Stderr
-		mountCmd.Args = append(mountCmd.Args, "--fuse.debug")
+		mountCmd.Args = append(mountCmd.Args, "--debug")
 	}
 
 	// Start the command.