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#!/usr/bin/env python
# Copyright 2015 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.
"""Runs the 'ar' command after removing its output file first.
This script is invoked like:
python gcc_ar_wrapper.py --ar=$AR --output=$OUT $OP $INPUTS
to do the equivalent of:
rm -f $OUT && $AR $OP $OUT $INPUTS
"""
import argparse
import os
import subprocess
import sys
# When running on a Windows host and using a toolchain whose tools are
# actually wrapper scripts (i.e. .bat files on Windows) rather than binary
# executables, the "command" to run has to be prefixed with this magic.
# The GN toolchain definitions take care of that for when GN/Ninja is
# running the tool directly. When that command is passed in to this
# script, it appears as a unitary string but needs to be split up so that
# just 'cmd' is the actual command given to Python's subprocess module.
BAT_PREFIX = 'cmd /c call '
def CommandToRun(command):
if command[0].startswith(BAT_PREFIX):
command = command[0].split(None, 3) + command[1:]
return command
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('--ar',
required=True,
help='The ar binary to run',
metavar='PATH')
parser.add_argument('--output',
required=True,
help='Output archive file',
metavar='ARCHIVE')
parser.add_argument('--plugin',
help='Load plugin')
parser.add_argument('operation',
help='Operation on the archive')
parser.add_argument('inputs', nargs='+',
help='Input files')
args = parser.parse_args()
command = [args.ar, args.operation]
if args.plugin is not None:
command += ['--plugin', args.plugin]
command.append(args.output)
command += args.inputs
# Remove the output file first.
try:
os.remove(args.output)
except OSError as e:
if e.errno != os.errno.ENOENT:
raise
# Now just run the ar command.
return subprocess.call(CommandToRun(command))
if __name__ == "__main__":
sys.exit(main())
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