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1#!/usr/bin/env python
2# Copyright (C) 2017 The Android Open Source Project
3#
4# Licensed under the Apache License, Version 2.0 (the "License");
5# you may not use this file except in compliance with the License.
6# You may obtain a copy of the License at
7#
8#      http://www.apache.org/licenses/LICENSE-2.0
9#
10# Unless required by applicable law or agreed to in writing, software
11# distributed under the License is distributed on an "AS IS" BASIS,
12# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13# See the License for the specific language governing permissions and
14# limitations under the License.
15
16""" Wrapper to invoke compiled build tools from the build system.
17
18This is just a workaround for GN assuming that all external scripts are
19python sources. It is used to invoke tools like the protoc compiler.
20"""
21
22import argparse
23import os
24import subprocess
25import sys
26
27def main():
28  parser = argparse.ArgumentParser()
29  parser.add_argument('--chdir', default=None)
30  parser.add_argument('--stamp', default=None)
31  parser.add_argument('--path', default=None)
32  parser.add_argument('--noop', default=False, action='store_true')
33  parser.add_argument('--suppress_stdout', default=False, action='store_true')
34  parser.add_argument('--suppress_stderr', default=False, action='store_true')
35  parser.add_argument('cmd', nargs=argparse.REMAINDER)
36  args = parser.parse_args()
37
38  if args.noop:
39    return 0
40
41  if args.chdir and not os.path.exists(args.chdir):
42    print >> sys.stderr, 'Cannot chdir to %s from %s' % (workdir, os.getcwd())
43    return 1
44
45  exe = os.path.abspath(args.cmd[0]) if os.sep in args.cmd[0] else args.cmd[0]
46  env = os.environ.copy()
47  if args.path:
48    env['PATH'] = os.path.abspath(args.path) + os.pathsep + env['PATH']
49
50  devnull = open(os.devnull, 'wb')
51  stdout = devnull if args.suppress_stdout else None
52  stderr = devnull if args.suppress_stderr else None
53
54  try:
55    proc = subprocess.Popen(
56        [exe] + args.cmd[1:],
57        cwd=args.chdir,
58        env=env,
59        stderr=stderr,
60        stdout=stdout)
61    ret = proc.wait()
62    if ret == 0 and args.stamp:
63      with open(args.stamp, 'w'):
64        os.utime(args.stamp, None)
65    return ret
66  except OSError as e:
67    print 'Error running: "%s" (%s)' % (args.cmd[0], e.strerror)
68    print 'PATH=%s' % env.get('PATH')
69    return 127
70
71if __name__ == '__main__':
72  sys.exit(main())
73