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#!/usr/bin/env python
# Copyright (c) 2011 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Extracts a single file from a CAB archive."""
import os
import subprocess
import sys
import tempfile
lock_file = os.path.join(tempfile.gettempdir(), 'expand.lock')
def acquire_lock():
while True:
try:
fd = os.open(lock_file, os.O_CREAT | os.O_EXCL | os.O_RDWR)
return fd
except OSError as e:
if e.errno != errno.EEXIST:
raise
print 'Cab extraction could not get exclusive lock. Retrying in 100ms...'
time.sleep(0.1)
def release_lock(fd):
os.close(fd)
os.unlink(lock_file)
def main():
if len(sys.argv) != 4:
print 'Usage: extract_from_cab.py cab_path archived_file output_dir'
return 1
[cab_path, archived_file, output_dir] = sys.argv[1:]
lock_fd = acquire_lock()
try:
# Invoke the Windows expand utility to extract the file.
level = subprocess.call(
['expand', cab_path, '-F:' + archived_file, output_dir])
if level != 0:
return level
finally:
release_lock(lock_fd)
# The expand utility preserves the modification date and time of the archived
# file. Touch the extracted file. This helps build systems that compare the
# modification times of input and output files to determine whether to do an
# action.
os.utime(os.path.join(output_dir, archived_file), None)
return 0
if __name__ == '__main__':
sys.exit(main())
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