tests/readlink.py

outgoing: move filtering logic in its own function

This move code dedicated to a single purpose together and make the main code
simpler. Right when we are getting ready to make it more complex :-D

Differential Revision: https://phab.mercurial-scm.org/D10382

#!/usr/bin/env python3

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)