tests/readlink.py

bookmarks: properly invalidate volatile sets when writing bookmarks

This corrects a regression introduced during the 3.7 cycle, but which
went undetected due to the surviving-but-deprecated write() method on
bmstore.

#!/usr/bin/env python

import errno, os, 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, 'not a symlink'

sys.exit(0)