remove_bundled_libraries.py

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#!/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.

See README for more details.

"""

from __future__ import print_function

import optparse

import os.path

import sys

def DoMain(argv):

  my_dirname = os.path.abspath(os.path.dirname(__file__))

  source_tree_root = os.path.abspath(

    os.path.join(my_dirname, '..', '..', '..'))

  if os.path.join(source_tree_root, 'build', 'linux', 'unbundle') != my_dirname:

    print('Sanity check failed: please run this script from '

          'build/linux/unbundle directory.')

    return 1

  parser = optparse.OptionParser()

  parser.add_option('--do-remove', action='store_true')

  options, args = parser.parse_args(argv)

  exclusion_used = {}

  for exclusion in args:

    exclusion_used[exclusion] = False

  for root, dirs, files in os.walk(source_tree_root, topdown=False):

    # Only look at paths which contain a "third_party" component

    # (note that e.g. third_party.png doesn't count).

    root_relpath = os.path.relpath(root, source_tree_root)

    if 'third_party' not in root_relpath.split(os.sep):

      continue

    for f in files:

      path = os.path.join(root, f)

      relpath = os.path.relpath(path, source_tree_root)

      excluded = False

      for exclusion in args:

        # Require precise exclusions. Find the right-most third_party

        # in the relative path, and if there is more than one ignore

        # the exclusion if it's completely contained within the part

        # before right-most third_party path component.

        split = relpath.rsplit(os.sep + 'third_party' + os.sep, 1)

        if len(split) > 1 and split[0].startswith(exclusion):

          continue

        if relpath.startswith(exclusion):

          # Multiple exclusions can match the same path. Go through all of them

          # and mark each one as used.

          exclusion_used[exclusion] = 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

      # Same about GN files.

      if f.endswith('.gn') or f.endswith('.gni'):

        continue

      # Deleting .isolate files leads to gyp failures. They are usually

      # not used by a distro build anyway.

      # See http://www.chromium.org/developers/testing/isolated-testing

      # for more info.

      if f.endswith('.isolate'):

        continue

      if options.do_remove:

        # Delete the file - best way to ensure it's not used during build.

        os.remove(path)

      else:

        # By default just print paths that would be removed.

        print(path)

  exit_code = 0

  # Fail if exclusion list contains stale entries - this helps keep it

  # up to date.

  for exclusion, used in exclusion_used.items():

    if not used:

      print('%s does not exist' % exclusion)

      exit_code = 1

  if not options.do_remove:

    print('To actually remove files printed above, please pass '

          '--do-remove flag.')

  return exit_code

if __name__ == '__main__':

  sys.exit(DoMain(sys.argv[1:]))