build/symlink.py

   1 #!/usr/bin/env python
   2 # Copyright (c) 2013 The Chromium Authors. 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.
   5
   6 """Make a symlink and optionally touch a file (to handle dependencies)."""
   7
   8
   9 import errno
  10 import optparse
  11 import os.path
  12 import sys
  13
  14
  15 def Main(argv):
  16   parser = optparse.OptionParser()
  17   parser.add_option('-f', '--force', action='store_true')
  18   parser.add_option('--touch')
  19
  20   options, args = parser.parse_args(argv[1:])
  21   if len(args) < 2:
  22     parser.error('at least two arguments required.')
  23
  24   target = args[-1]
  25   sources = args[:-1]
  26   for s in sources:
  27     t = os.path.join(target, os.path.basename(s))
  28     try:
  29       os.symlink(s, t)
  30     except OSError, e:
  31       if e.errno == errno.EEXIST and options.force:
  32         os.remove(t)
  33         os.symlink(s, t)
  34       else:
  35         raise
  36
  37
  38   if options.touch:
  39     with open(options.touch, 'w') as f:
  40       pass
  41
  42
  43 if __name__ == '__main__':
  44   sys.exit(Main(sys.argv))