This controls whether the uname information will
          be loaded.

        * ``include_oslevel`` (bool): The result of the ``include_oslevel``
          parameter. This controls whether (AIX) oslevel information will be
          loaded.

        * ``root_dir`` (string): The result of the ``root_dir`` parameter.
          The absolute path to the root directory to use to find distro-related
          information files.

        Raises:

        * :py:exc:`ValueError`: Initialization parameters combination is not
           supported.

        * :py:exc:`OSError`: Some I/O issue with an os-release file or distro
          release file.

        * :py:exc:`UnicodeError`: A data source has unexpected characters or
          uses an unexpected encoding.
        Z