'Returns filename of the active image from the info file.'

def get_active_image_from_info(self, volume):

    info_file = self._local_path_volume_info(volume)
    snap_info = self._read_info_file(info_file, empty_if_missing=True)
    if (not snap_info):
        vol_path = os.path.basename(self.local_path(volume))
        return vol_path
    return snap_info['active']
