tests/readlink.py

convert: add support for deterministic progress bar on scanning phase

This makes it possible to estimate how long the "scanning source"
phase will take, if the specified source repo type supports a quick
"how many changes" check.

#!/usr/bin/env python

import errno, os, sys

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

sys.exit(0)