1# Copyright (C) 2019 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7#      http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14
15import os
16import subprocess
17import sys
18
19def main(argv):
20  if len(argv) != 2:
21    print 'Usage: %s output_file.h'
22    return 1
23  revision = subprocess.check_output(['git', 'rev-parse', 'HEAD']).strip()
24  new_contents = '#define PERFETTO_GET_GIT_REVISION() "%s"\n' % revision
25  out_file = argv[1]
26  old_contents = ''
27  if os.path.isfile(out_file):
28    with open(out_file) as f:
29      old_contents = f.read()
30  if old_contents == new_contents:
31    return 0
32  with open(out_file, 'w') as f:
33    f.write(new_contents)
34  return 0
35
36if __name__ == '__main__':
37  sys.exit(main(sys.argv))
38