config/rebuild_check.py

   1 # This Source Code Form is subject to the terms of the Mozilla Public
   2 # License, v. 2.0. If a copy of the MPL was not distributed with this
   3 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
   4
   5 import os
   6 import errno
   7
   8 def mtime(path):
   9     try:
  10         return os.stat(path).st_mtime
  11     except OSError as e:
  12         if e.errno == errno.ENOENT:
  13             return -1
  14         raise
  15
  16 def rebuild_check(args):
  17     target = args[0]
  18     deps = args[1:]
  19     t = mtime(target)
  20     if t < 0:
  21         print target
  22         return
  23
  24     newer = []
  25     removed = []
  26     for dep in deps:
  27         deptime = mtime(dep)
  28         if deptime < 0:
  29             removed.append(dep)
  30         elif mtime(dep) > t:
  31             newer.append(dep)
  32
  33     if newer and removed:
  34         print 'Rebuilding %s because %s changed and %s was removed' % (target, ', '.join(newer), ', '.join(removed))
  35     elif newer:
  36         print 'Rebuilding %s because %s changed' % (target, ', '.join(newer))
  37     elif removed:
  38         print 'Rebuilding %s because %s was removed' % (target, ', '.join(removed))
  39     else:
  40         print 'Rebuilding %s for an unknown reason' % target
  41
  42 if __name__ == '__main__':
  43     import sys
  44     rebuild_check(sys.argv[1:])