Linux: add script to remove bundled libraries.

build/linux/unbundle/remove_bundled_libraries.py

+#!/usr/bin/env python
+# Copyright 2013 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.
+
+"""
+Removes bundled libraries to make sure they are not used.

[Lei Zhang, 2013/08/20 23:41:10]

Can you elaborate on what this means exactly?

[Paweł Hajdan Jr., 2013/08/21 00:42:40]

See README updates. Further feedback is welcome.

[Lei Zhang, 2013/08/21 01:27:03]

Can you write "See README for more details." here?

+"""
+
+
+import os.path
+import sys
+
+
+def DoMain(argv):
+  my_dirname = os.path.dirname(__file__)
+  source_tree_root = os.path.abspath(
+    os.path.join(my_dirname, '..', '..', '..'))
+
+  status_dict = {}
+  for exclusion in argv[1:]:

[Lei Zhang, 2013/08/20 23:41:10]

Document what argv[1:] is?

+    status_dict[exclusion] = {'exists': False}

[Lei Zhang, 2013/08/20 23:41:10]

Why do the values in |status_dict| have to be a dict? Why can't the value just
be a boolean?

[Paweł Hajdan Jr., 2013/08/21 00:42:40]

Done.

+
+  for root, dirs, files in os.walk(source_tree_root, topdown=False):
+    for f in files:
+      path = os.path.join(root, f)
+      relpath = os.path.relpath(path, source_tree_root)
+
+      # Only look at paths which contain a "third_party" component
+      # (note that e.g. third_party.png doesn't count).
+      if 'third_party' not in relpath.split(os.sep):

[Lei Zhang, 2013/08/20 23:41:10]

You don't have to do this on a per-file basis.

for root, dirs, files in os.walk(source_tree_root):
  relpath = os.path.relpath(root, source_tree_root)
  if 'third_party' not in relpath.split(os.sep):
    continue
  for f in files:
    relpath = os.path.join(relpath, f)
    ...

[Paweł Hajdan Jr., 2013/08/21 00:42:40]

Done.

+        continue
+
+      excluded = False
+      for exclusion in argv:

[Lei Zhang, 2013/08/20 23:41:10]

Shouldn't you skip argv[0] ?

[Paweł Hajdan Jr., 2013/08/21 00:42:40]

Done.

+        if relpath.startswith(exclusion):
+          # Multiple exclusions can match the same path. Go through all of them
+          # and mark each one as used.
+          status_dict[exclusion]['exists'] = True
+          excluded = True
+      if excluded:
+        continue
+
+      # Deleting gyp files almost always leads to gyp failures.
+      # These files come from Chromium project, and can be replaced if needed.
+      if f.endswith('.gyp') or f.endswith('.gypi'):
+        continue
+
+      # Delete the file - best way to ensure it's not used during build.
+      os.remove(path)

[Lei Zhang, 2013/08/20 23:41:10]

No dry run mode? Seems dangerous.

[Paweł Hajdan Jr., 2013/08/21 00:42:40]

I don't think dry run would be useful given how this is supposed to be used. :)

[Lei Zhang, 2013/08/21 01:27:03]

How about dry run by default (print what is to be deleted) and only delete with
a '--yes-please-delete' flag? Someone is going to shoot themselves in the foot,
and if they do, you can at least point and say "you passed that flag".

+
+  exit_code = 0
+
+  # Fail if exclusion list contains stale entries - this helps keep it
+  # up to date.
+  for exclusion, status in status_dict.iteritems():
+    if not status['exists']:
+      print '%s does not exist' % exclusion
+      exit_code = 1
+
+  return exit_code
+
+
+if __name__ == '__main__':
+  sys.exit(DoMain(sys.argv))