C++ (Cpp) grub_find_zpool_from_dir Examples

Example #1

File: getroot.c Project: TemmeR/grub2

static char *
find_root_device_from_libzfs (const char *dir)
{
  char *device;
  char *poolname;
  char *poolfs;

  grub_find_zpool_from_dir (dir, &poolname, &poolfs);
  if (! poolname)
    return NULL;

  {
    zpool_handle_t *zpool;
    libzfs_handle_t *libzfs;
    nvlist_t *nvlist;
    nvlist_t **nvlist_array;
    unsigned int nvlist_count;

    libzfs = grub_get_libzfs_handle ();
    if (! libzfs)
      return NULL;

    zpool = zpool_open (libzfs, poolname);
    nvlist = zpool_get_config (zpool, NULL);

    if (nvlist_lookup_nvlist (nvlist, "vdev_tree", &nvlist) != 0)
      error (1, errno, "nvlist_lookup_nvlist (\"vdev_tree\")");

    if (nvlist_lookup_nvlist_array (nvlist, "children", &nvlist_array, &nvlist_count) != 0)
      error (1, errno, "nvlist_lookup_nvlist_array (\"children\")");

    do
      {
	assert (nvlist_count > 0);
      } while (nvlist_lookup_nvlist_array (nvlist_array[0], "children",
					   &nvlist_array, &nvlist_count) == 0);

    if (nvlist_lookup_string (nvlist_array[0], "path", &device) != 0)
      error (1, errno, "nvlist_lookup_string (\"path\")");

    zpool_close (zpool);
  }

  free (poolname);
  if (poolfs)
    free (poolfs);

  return device;
}

Example #2

File: getroot.c Project: wkbittner/grub2-virtfs

static char *
find_root_device_from_libzfs (const char *dir)
{
  char *device = NULL;
  char *poolname;
  char *poolfs;

  grub_find_zpool_from_dir (dir, &poolname, &poolfs);
  if (! poolname)
    return NULL;

  {
    zpool_handle_t *zpool;
    libzfs_handle_t *libzfs;
    nvlist_t *config, *vdev_tree;
    nvlist_t **children, **path;
    unsigned int nvlist_count;
    unsigned int i;

    libzfs = grub_get_libzfs_handle ();
    if (! libzfs)
      return NULL;

    zpool = zpool_open (libzfs, poolname);
    config = zpool_get_config (zpool, NULL);

    if (nvlist_lookup_nvlist (config, "vdev_tree", &vdev_tree) != 0)
      error (1, errno, "nvlist_lookup_nvlist (\"vdev_tree\")");

    if (nvlist_lookup_nvlist_array (vdev_tree, "children", &children, &nvlist_count) != 0)
      error (1, errno, "nvlist_lookup_nvlist_array (\"children\")");
    assert (nvlist_count > 0);

    while (nvlist_lookup_nvlist_array (children[0], "children",
				       &children, &nvlist_count) == 0)
      assert (nvlist_count > 0);

    for (i = 0; i < nvlist_count; i++)
      {
	if (nvlist_lookup_string (children[i], "path", &device) != 0)
	  error (1, errno, "nvlist_lookup_string (\"path\")");

	struct stat st;
	if (stat (device, &st) == 0)
	  {
	    device = xstrdup (device);
	    break;
	  }

	device = NULL;
      }

    zpool_close (zpool);
  }

  free (poolname);
  if (poolfs)
    free (poolfs);

  return device;
}