Synnefo » snf-ganeti

def DiagnoseExtStorage(top_dirs=None):

  """Compute the validity for all ExtStorage Providers.

  @type top_dirs: list

  @param top_dirs: the list of directories in which to

      search (if not given defaults to

      L{pathutils.ES_SEARCH_PATH})

  @rtype: list of L{objects.ExtStorage}

  @return: a list of tuples (name, path, status, diagnose, parameters)

      for all (potential) ExtStorage Providers under all

      search paths, where:

          - name is the (potential) ExtStorage Provider

          - path is the full path to the ExtStorage Provider

          - status True/False is the validity of the ExtStorage Provider

          - diagnose is the error message for an invalid ExtStorage Provider,

            otherwise empty

          - parameters is a list of (name, help) parameters, if any

  """

  if top_dirs is None:

    top_dirs = pathutils.ES_SEARCH_PATH

  result = []

  for dir_name in top_dirs:

    if os.path.isdir(dir_name):

      try:

        f_names = utils.ListVisibleFiles(dir_name)

      except EnvironmentError, err:

        logging.exception("Can't list the ExtStorage directory %s: %s",

                          dir_name, err)

        break

      for name in f_names:

        es_path = utils.PathJoin(dir_name, name)

        status, es_inst = bdev.ExtStorageFromDisk(name, base_dir=dir_name)

        if status:

          diagnose = ""

          parameters = es_inst.supported_parameters

        else:

          diagnose = es_inst

          parameters = []

        result.append((name, es_path, status, diagnose, parameters))

  return result