prepare_framework_version.py

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# 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 os

import shutil

import sys

# Ensures that the current version matches the last-produced version, which is

# stored in the version_file. If it does not, then the framework_root_dir is

# obliterated.

# Usage: python prepare_framework_version.py out/obj/version_file \

#                                            out/Framework.framework \

#                                            'A'

def PrepareFrameworkVersion(version_file, framework_root_dir, version):

  # Test what the current framework version is. Stop if it is up-to-date.

  try:

    with open(version_file, 'r') as f:

      current_version = f.read()

      if current_version == version:

        return

  except IOError:

    pass

  # The framework version has changed, so clobber the framework.

  if os.path.exists(framework_root_dir):

    shutil.rmtree(framework_root_dir)

  # Write out the new framework version file, making sure its containing

  # directory exists.

  dirname = os.path.dirname(version_file)

  if not os.path.isdir(dirname):

    os.makedirs(dirname, 0o700)

  with open(version_file, 'w+') as f:

    f.write(version)

if __name__ == '__main__':

  PrepareFrameworkVersion(sys.argv[1], sys.argv[2], sys.argv[3])

  sys.exit(0)