system.py 文件源码

def is_tarfile(path):
  """
  Returns if the path belongs to a tarfile or not.

  .. versionadded:: 1.2.0

  :param str path: path to be checked

  :returns: **True** if the path belongs to a tarball, **False** otherwise
  """

  # Checking if it's a tar file may fail due to permissions so failing back
  # to the mime type...
  #
  #   IOError: [Errno 13] Permission denied: '/vmlinuz.old'
  #
  # With python 3 insuffient permissions raises an AttributeError instead...
  #
  #   http://bugs.python.org/issue17059

  try:
    return tarfile.is_tarfile(path)
  except (IOError, AttributeError):
    return mimetypes.guess_type(path)[0] == 'application/x-tar'