config.py 文件源码

def version_getter(config):
    """Get tag associated with HEAD; fall back to SHA1.

    If HEAD is tagged, return the tag name; otherwise fall back to
    HEAD's short SHA1 hash.

    .. note:: Only annotated tags are considered.

    TODO: Support non-annotated tags?

    """
    try:
        check_output(['git', 'rev-parse', '--is-inside-work-tree'], stderr=DEVNULL)
    except CalledProcessError:
        return None
    encoding = getpreferredencoding(do_setlocale=False)
    try:
        version = check_output(['git', 'describe', '--exact-match'], stderr=DEVNULL)
    except CalledProcessError:
        version = check_output(['git', 'rev-parse', '--short', 'HEAD'])
    version = version.decode(encoding).strip()
    return version