Make sure files are named after their hashes.

renmd5.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright 2015, Ekevoo.com.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
# compliance with the License. You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is
# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and limitations under the License.
#
from hashlib import md5
from logging import getLogger, DEBUG, StreamHandler
from os import rename
from os.path import splitext, split, join
from sys import argv

log = getLogger('renmd5')


def main(params):
    if params:
        params = map(renmd5, params)
        return sum(params)
    else:
        log.fatal('No filenames provided.')
        return 1


def renmd5(name):
    try:
        newname = get_hash(name)
        parentpath, filename = split(name)
        filename, extension = splitext(filename)
        newname += extension
        if parentpath:
            newname = join(parentpath, newname)
        if name != newname:
            log.info('%s -> %s', name, newname)
            rename(name, newname)
        else:
            log.info('%s: no change.', name)
        return 0
    except IOError as e:
        log.exception(e)
        return 1


def get_hash(name):
    block = 0x1000
    hasher = md5()
    with open(name, 'rb') as f:
        buffer = f.read(block)
        while buffer:
            hasher.update(buffer)
            buffer = f.read(block)
    return hasher.hexdigest()


if __name__ == '__main__':
    log.level = DEBUG
    log.addHandler(StreamHandler())
    exit(main(argv[1:]))