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 shutil
  13 import sys
  14
  15
  16 def Main(argv):
  17   parser = optparse.OptionParser()
  18   parser.add_option('-f', '--force', action='store_true')
  19   parser.add_option('--touch')
  20
  21   options, args = parser.parse_args(argv[1:])
  22   if len(args) < 2:
  23     parser.error('at least two arguments required.')
  24
  25   target = args[-1]
  26   sources = args[:-1]
  27   for s in sources:
  28     t = os.path.join(target, os.path.basename(s))
  29     if len(sources) == 1 and not os.path.isdir(target):
  30       t = target
  31     try:
  32       os.symlink(s, t)
  33     except OSError, e:
  34       if e.errno == errno.EEXIST and options.force:
  35         if os.path.isdir(t):
  36           shutil.rmtree(t, ignore_errors=True)
  37         else:
  38           os.remove(t)
  39         os.symlink(s, t)
  40       else:
  41         raise
  42
  43
  44   if options.touch:
  45     with open(options.touch, 'w') as f:
  46       pass
  47
  48
  49 if __name__ == '__main__':
  50   sys.exit(Main(sys.argv))