tests/readlink.py

tests: skip pyflakes for mercurial/thirdparty/

The current version of pyflakes (2.2.0) correctly detects one issue:

  mercurial/thirdparty/selectors2.py:335:40 '...'.format(...) has unused arguments at position(s): 1

But we're not interested in fixing lint errors in third-party code, so we need
to exclude at least selectors2.py. And in the discussion for this patch it was
decided to just skip the entire thirdparty directory.

This is a graft of a similar fix that ended up on default.

Differential Revision: https://phab.mercurial-scm.org/D8628

#!/usr/bin/env python

from __future__ import absolute_import, print_function

import errno
import os
import sys

for f in sys.argv[1:]:
    try:
        print(f, '->', os.readlink(f))
    except OSError as err:
        if err.errno != errno.EINVAL:
            raise
        print(f, '->', f, 'not a symlink')

sys.exit(0)