2 # Copyright (c) 2011 Google Inc. 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.
6 """These functions are executed via gyp-flock-tool when using the Makefile
7 generator. Used on systems that don't have a built-in flock."""
17 executor = FlockTool()
18 executor.Dispatch(args)
21 class FlockTool(object):
22 """This class emulates the 'flock' command."""
23 def Dispatch(self, args):
24 """Dispatches a string command to a method."""
26 raise Exception("Not enough arguments")
28 method = "Exec%s" % self._CommandifyName(args[0])
29 getattr(self, method)(*args[1:])
31 def _CommandifyName(self, name_string):
32 """Transforms a tool name like copy-info-plist to CopyInfoPlist"""
33 return name_string.title().replace('-', '')
35 def ExecFlock(self, lockfile, *cmd_list):
36 """Emulates the most basic behavior of Linux's flock(1)."""
37 # Rely on exception handling to report errors.
38 # Note that the stock python on SunOS has a bug
39 # where fcntl.flock(fd, LOCK_EX) always fails
40 # with EBADF, that's why we use this F_SETLK
42 fd = os.open(lockfile, os.O_WRONLY|os.O_NOCTTY|os.O_CREAT, 0666)
43 if sys.platform.startswith('aix'):
44 # Python on AIX is compiled with LARGEFILE support, which changes the
46 op = struct.pack('hhIllqq', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
48 op = struct.pack('hhllhhl', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
49 fcntl.fcntl(fd, fcntl.F_SETLK, op)
50 return subprocess.call(cmd_list)
53 if __name__ == '__main__':
54 sys.exit(main(sys.argv[1:]))