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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. | |
5 | |
6 """Extracts a single file from a CAB archive.""" | |
7 | |
8 import os | |
9 import shutil | |
10 import subprocess | |
11 import sys | |
12 import tempfile | |
13 | |
14 def run_quiet(*args): | |
15 """Run 'expand' suppressing 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 | |
22 | |
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 | |
27 | |
28 [cab_path, archived_file, output_dir] = sys.argv[1:] | |
29 | |
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) | |
35 | |
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) | |
50 | |
51 if level != 0: | |
52 return level | |
53 | |
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 | |
60 | |
61 | |
62 if __name__ == '__main__': | |
63 sys.exit(main()) | |
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