def info_file(distro=None):
    """Return default distroinfo info file"""
    if not distro:
        distro = cfg['DISTRO']
    info_file_conf = distro.upper() + 'INFO_FILE'
    try:
        return cfg[info_file_conf]
    except KeyError:
        raise exception.InvalidUsage(
            why="Couldn't find config option %s for distro: %s"
                % (info_file_conf, distro))