1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/webrtc/trunk/build/extract_from_cab.py Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,63 @@
1.4 +#!/usr/bin/env python
1.5 +# Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.6 +# Use of this source code is governed by a BSD-style license that can be
1.7 +# found in the LICENSE file.
1.8 +
1.9 +"""Extracts a single file from a CAB archive."""
1.10 +
1.11 +import os
1.12 +import shutil
1.13 +import subprocess
1.14 +import sys
1.15 +import tempfile
1.16 +
1.17 +def run_quiet(*args):
1.18 + """Run 'expand' supressing noisy output. Returns returncode from process."""
1.19 + popen = subprocess.Popen(args, stdout=subprocess.PIPE)
1.20 + out, _ = popen.communicate()
1.21 + if popen.returncode:
1.22 + # expand emits errors to stdout, so if we fail, then print that out.
1.23 + print out
1.24 + return popen.returncode
1.25 +
1.26 +def main():
1.27 + if len(sys.argv) != 4:
1.28 + print 'Usage: extract_from_cab.py cab_path archived_file output_dir'
1.29 + return 1
1.30 +
1.31 + [cab_path, archived_file, output_dir] = sys.argv[1:]
1.32 +
1.33 + # Expand.exe does its work in a fixed-named temporary directory created within
1.34 + # the given output directory. This is a problem for concurrent extractions, so
1.35 + # create a unique temp dir within the desired output directory to work around
1.36 + # this limitation.
1.37 + temp_dir = tempfile.mkdtemp(dir=output_dir)
1.38 +
1.39 + try:
1.40 + # Invoke the Windows expand utility to extract the file.
1.41 + level = run_quiet('expand', cab_path, '-F:' + archived_file, temp_dir)
1.42 + if level == 0:
1.43 + # Move the output file into place, preserving expand.exe's behavior of
1.44 + # paving over any preexisting file.
1.45 + output_file = os.path.join(output_dir, archived_file)
1.46 + try:
1.47 + os.remove(output_file)
1.48 + except OSError:
1.49 + pass
1.50 + os.rename(os.path.join(temp_dir, archived_file), output_file)
1.51 + finally:
1.52 + shutil.rmtree(temp_dir, True)
1.53 +
1.54 + if level != 0:
1.55 + return level
1.56 +
1.57 + # The expand utility preserves the modification date and time of the archived
1.58 + # file. Touch the extracted file. This helps build systems that compare the
1.59 + # modification times of input and output files to determine whether to do an
1.60 + # action.
1.61 + os.utime(os.path.join(output_dir, archived_file), None)
1.62 + return 0
1.63 +
1.64 +
1.65 +if __name__ == '__main__':
1.66 + sys.exit(main())
