[Mac/GN] Clean up old version folders in Chromium.app/Contents/Versions.

chrome/tools/build/mac/clean_up_old_versions.py

+# Copyright 2016 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 optparse
+import os
+import shutil
+import sys
+
+
+def CleanUpOldVersions(path_to_app, keep_version, stamp_path):
+  versions_dir = os.path.join(path_to_app, 'Contents', 'Versions')
+  for version in os.listdir(versions_dir):
+    if version != keep_version:
+      shutil.rmtree(os.path.join(versions_dir, version))
+
+  open(stamp_path, 'w').close()

[Mark Mentovai, 2016/07/25 18:13:46]

You should also call os.utime(stamp_path, None) to guarantee that the mtime is
updated. Python seems to touch the stamp with this one-liner, probably because
'w' maps to O_WRONLY | O_TRUNC, but I don’t think anything guarantees that
(specifically, I don’t think that a no-op ftruncate() is guaranteed to touch the
mtime).

[Robert Sesek, 2016/07/25 18:21:41]

Done.

+
+
+def Main():
+  parser = optparse.OptionParser(
+      usage='%prog path/to/Chromium.app keep_version stamp_path')
+  opts, args = parser.parse_args()
+  if len(args) != 3:
+    parser.error('missing arguments')
+    return 1
+
+  CleanUpOldVersions(*args)
+  return 0
+
+if __name__ == '__main__':
+  sys.exit(Main())