2 # Copyright 2012 The Chromium Authors
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."""
16 """Run 'expand' suppressing noisy output. Returns returncode from process."""
17 popen = subprocess.Popen(args, stdout=subprocess.PIPE)
18 out, _ = popen.communicate()
20 # expand emits errors to stdout, so if we fail, then print that out.
22 return popen.returncode
25 if len(sys.argv) != 4:
26 print('Usage: extract_from_cab.py cab_path archived_file output_dir')
29 [cab_path, archived_file, output_dir] = sys.argv[1:]
31 # Expand.exe does its work in a fixed-named temporary directory created within
32 # the given output directory. This is a problem for concurrent extractions, so
33 # create a unique temp dir within the desired output directory to work around
35 temp_dir = tempfile.mkdtemp(dir=output_dir)
38 # Invoke the Windows expand utility to extract the file.
39 level = run_quiet('expand', cab_path, '-F:' + archived_file, temp_dir)
41 # Move the output file into place, preserving expand.exe's behavior of
42 # paving over any preexisting file.
43 output_file = os.path.join(output_dir, archived_file)
45 os.remove(output_file)
48 os.rename(os.path.join(temp_dir, archived_file), output_file)
50 shutil.rmtree(temp_dir, True)
55 # The expand utility preserves the modification date and time of the archived
56 # file. Touch the extracted file. This helps build systems that compare the
57 # modification times of input and output files to determine whether to do an
59 os.utime(os.path.join(output_dir, archived_file), None)
63 if __name__ == '__main__':