The Tor Browser / file comparison
comparison: media/webrtc/trunk/build/extract_from_cab.py
media/webrtc/trunk/build/extract_from_cab.py
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- 6474c204b198
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| -1:000000000000 | 0:8cdd40777f1d |
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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' 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 | |
| 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()) |
