tests/readlink.py

bundlerepo: enforce the requirements declared by the underlying repository

Previously, `hg log -r 'bundle()' -R bundle.hg` was failing for me when run from
source, complaining about an unknown parent, when the system installed `hg`
didn't.  Some debugging showed the index was 0 length.  It turned out that I
didn't have the C extensions compiled, which a simple `hg log -r .` was able to
indicate.  The problem being that the RequirementError got handled by RepoError,
which uses an empty directory as a fallback to process the bundle.

#!/usr/bin/env python3


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)