media/webrtc/trunk/build/extract_from_cab.py@6474c204b198
media/webrtc/trunk/build/extract_from_cab.py
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rwxr-xr-x
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
1 #!/usr/bin/env python
2 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style license that can be
4 # found in the LICENSE file.
6 """Extracts a single file from a CAB archive."""
8 import os
9 import shutil
10 import subprocess
11 import sys
12 import tempfile
14 def run_quiet(*args):
15 """Run 'expand' supressing noisy output. Returns returncode from process."""
16 popen = subprocess.Popen(args, stdout=subprocess.PIPE)
17 out, _ = popen.communicate()
18 if popen.returncode:
19 # expand emits errors to stdout, so if we fail, then print that out.
20 print out
21 return popen.returncode
23 def main():
24 if len(sys.argv) != 4:
25 print 'Usage: extract_from_cab.py cab_path archived_file output_dir'
26 return 1
28 [cab_path, archived_file, output_dir] = sys.argv[1:]
30 # Expand.exe does its work in a fixed-named temporary directory created within
31 # the given output directory. This is a problem for concurrent extractions, so
32 # create a unique temp dir within the desired output directory to work around
33 # this limitation.
34 temp_dir = tempfile.mkdtemp(dir=output_dir)
36 try:
37 # Invoke the Windows expand utility to extract the file.
38 level = run_quiet('expand', cab_path, '-F:' + archived_file, temp_dir)
39 if level == 0:
40 # Move the output file into place, preserving expand.exe's behavior of
41 # paving over any preexisting file.
42 output_file = os.path.join(output_dir, archived_file)
43 try:
44 os.remove(output_file)
45 except OSError:
46 pass
47 os.rename(os.path.join(temp_dir, archived_file), output_file)
48 finally:
49 shutil.rmtree(temp_dir, True)
51 if level != 0:
52 return level
54 # The expand utility preserves the modification date and time of the archived
55 # file. Touch the extracted file. This helps build systems that compare the
56 # modification times of input and output files to determine whether to do an
57 # action.
58 os.utime(os.path.join(output_dir, archived_file), None)
59 return 0
62 if __name__ == '__main__':
63 sys.exit(main())
