| # Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| import errno |
| import os |
| import uuid |
| |
| """Creates a directory and its parents (i.e. `mkdir -p`). |
| |
| If the directory already exists, does nothing.""" |
| def mkdir_p(path): |
| try: |
| os.makedirs(path) |
| except OSError as exc: |
| if exc.errno == errno.EEXIST and os.path.isdir(path): |
| pass |
| else: |
| raise |
| |
| |
| """Creates or ovewrites a symlink from `link` to `target`.""" |
| def symlink(target, link): |
| mkdir_p(os.path.dirname(link)) |
| tmp_link = link + '.tmp.' + uuid.uuid4().hex |
| try: |
| os.remove(tmp_link) |
| except OSError: |
| pass |
| os.symlink(target, tmp_link) |
| try: |
| os.rename(tmp_link, link) |
| except FileExistsError: |
| try: |
| os.remove(tmp_link) |
| except OSError: |
| pass |
