Python fragment, mirroring repos from GitHub with pygithub3

mirror.py

    repos = gh.repos.list_by_org(args.org).all()

    for repo in repos:
        log.debug("Mirroring %s", repo.full_name)
        dirname = os.path.join(args.basedir, '%s.git' % repo.full_name)

        userdir = os.path.dirname(dirname)
        if not os.path.exists(userdir):
            os.mkdir(userdir)

        # Seed private forks from the org, when possible
        if not os.path.exists(dirname) and repo.owner.login != args.org:
            origin = os.path.join(args.basedir, args.org, '%s.git' % repo.name)
            if os.path.exists(origin):
                subprocess.check_call(('git', 'clone', '--mirror', '--quiet',
                                       origin, dirname))

        if not os.path.exists(dirname):
            subprocess.check_call(('git', 'clone', '--mirror', '--quiet',
                                   repo.clone_url, dirname))
        else:
            subprocess.check_call(('git', 'remote', 'set-url', 'origin',
                                   repo.clone_url), cwd=dirname)
            subprocess.check_call(('git', 'fetch', '--quiet', '--prune'),
                                  cwd=dirname)

        subprocess.check_call(('git', 'update-server-info'), cwd=dirname)

        with open(os.path.join(dirname, 'description'), 'w') as f:
            if repo.description:
                f.write(repo.description.encode('UTF-8'))