config.py 文件源码

def get_source_opts(type_=None, location=None, reference=None):
    return [cfg.StrOpt('type', choices=['local', 'git', 'url'],
                       default=type_,
                       help='Source location type'),
            cfg.StrOpt('location', default=location,
                       help='The location for source install'),
            cfg.StrOpt('reference', default=reference,
                       help=('Git reference to pull, commit sha, tag '
                             'or branch name'))]