'get all ring md5sum\'s'

def get_ring_md5(self):

    sums = {}
    for ringfile in self.rings:
        if os.path.exists(ringfile):
            try:
                sums[ringfile] = md5_hash_for_file(ringfile)
            except IOError as err:
                sums[ringfile] = None
                if (err.errno != errno.ENOENT):
                    self.logger.exception(_('Error    reading    ringfile'))
    return sums
