Error reporting missing details

[udim]

Hi, I believe our Jenkins environment is somehow broken, but it's hard to tell which file is not found and there's no way to enable stacktraces either (how do you pass debug to main()?).

From our CI logs:

14:21:34 ==> Detecting CI provider
14:21:34     Jenkins Detected
14:21:34     Fixing merge commit SHA
14:21:34 ==> Preparing upload
14:21:34 Error: 'FileNotFoundError' object has no attribute 'returncode'

Full log: https://ci-beam.apache.org/job/beam_PreCommit_Python_Commit/16554/consoleFull

I believe the issue is with this line:

codecov-python/codecov/__init__.py

Line 229 in 713d941

% (cmd, e.returncode, str(getattr(e, "output", str(e))))

[udim]

Adding mercurial to the virtualenv seems to resolve the failure.

==> Detecting CI provider
  -> Got branch from git/hg
  -> Got sha from git/hg
==> Preparing upload
    Error running `['hg', 'locate']`: returncode=255, output=b''
    Error running `['hg', 'locate']`: returncode=255, output=b''
==> Processing gcov (disable by -X gcov)

edit: This was running on a Jenkins node in a git repo.