56 lines
1.8 KiB
Python
56 lines
1.8 KiB
Python
#!/usr/bin/env python3
|
|
# Copyright (c) 2011 Google Inc. All rights reserved.
|
|
# Use of this source code is governed by a BSD-style license that can be
|
|
# found in the LICENSE file.
|
|
|
|
"""These functions are executed via gyp-flock-tool when using the Makefile
|
|
generator. Used on systems that don't have a built-in flock."""
|
|
|
|
import fcntl
|
|
import os
|
|
import struct
|
|
import subprocess
|
|
import sys
|
|
|
|
|
|
def main(args):
|
|
executor = FlockTool()
|
|
executor.Dispatch(args)
|
|
|
|
|
|
class FlockTool:
|
|
"""This class emulates the 'flock' command."""
|
|
|
|
def Dispatch(self, args):
|
|
"""Dispatches a string command to a method."""
|
|
if len(args) < 1:
|
|
raise Exception("Not enough arguments")
|
|
|
|
method = "Exec%s" % self._CommandifyName(args[0])
|
|
getattr(self, method)(*args[1:])
|
|
|
|
def _CommandifyName(self, name_string):
|
|
"""Transforms a tool name like copy-info-plist to CopyInfoPlist"""
|
|
return name_string.title().replace("-", "")
|
|
|
|
def ExecFlock(self, lockfile, *cmd_list):
|
|
"""Emulates the most basic behavior of Linux's flock(1)."""
|
|
# Rely on exception handling to report errors.
|
|
# Note that the stock python on SunOS has a bug
|
|
# where fcntl.flock(fd, LOCK_EX) always fails
|
|
# with EBADF, that's why we use this F_SETLK
|
|
# hack instead.
|
|
fd = os.open(lockfile, os.O_WRONLY | os.O_NOCTTY | os.O_CREAT, 0o666)
|
|
if sys.platform.startswith("aix"):
|
|
# Python on AIX is compiled with LARGEFILE support, which changes the
|
|
# struct size.
|
|
op = struct.pack("hhIllqq", fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
|
|
else:
|
|
op = struct.pack("hhllhhl", fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
|
|
fcntl.fcntl(fd, fcntl.F_SETLK, op)
|
|
return subprocess.call(cmd_list)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
sys.exit(main(sys.argv[1:]))
|