Traceback (most recent call last):
  File "/path/to/repo/sub_dir/perc_version", line 685, in <module>
    main()
  File "/path/to/repo/sub_dir/perc_version", line 567, in main
    perc_lib.fail_if_outdated()
  File "/path/to/repo/sub_dir/lib.py", line 451, in fail_if_outdated
    repo = git.Repo(os.path.dirname(command_path))
  File "/usr/local/lib/python2.7/site-packages/git/repo/base.py", line 162, in __init__
    raise InvalidGitRepositoryError(epath)
git.exc.InvalidGitRepositoryError: /path/to/repo/sub_dir