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."""
15 """Run 'expand' suppressing noisy output. Returns returncode from process."""
16 popen = subprocess.Popen(args, stdout=subprocess.PIPE)
17 out, _ = popen.communicate()
19 # expand emits errors to stdout, so if we fail, then print that out.
21 return popen.returncode
24 if len(sys.argv) != 4:
25 print 'Usage: extract_from_cab.py cab_path archived_file output_dir'
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
34 temp_dir = tempfile.mkdtemp(dir=output_dir)
37 # Invoke the Windows expand utility to extract the file.
38 level = run_quiet('expand', cab_path, '-F:' + archived_file, temp_dir)
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)
44 os.remove(output_file)
47 os.rename(os.path.join(temp_dir, archived_file), output_file)
49 shutil.rmtree(temp_dir, True)
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
58 os.utime(os.path.join(output_dir, archived_file), None)
62 if __name__ == '__main__':