if (!bootdir)
    bootdir = grub_util_path_concat (3, "/", rootdir, GRUB_BOOT_DIR_NAME);

  {
    char * t = grub_util_path_concat (2, bootdir, GRUB_DIR_NAME);
    grub_install_mkdir_p (t);
    grubdir = grub_canonicalize_file_name (t);
    if (!grubdir)
      grub_util_error (_("failed to get canonical path of `%s'"), t);
    free (t);
  }