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
   9 def mtime(path):
  10     try:
  11         return os.stat(path).st_mtime
  12     except OSError as e:
  13         if e.errno == errno.ENOENT:
  14             return -1
  15         raise
  16
  17
  18 def rebuild_check(args):
  19     target = args[0]
  20     deps = args[1:]
  21     t = mtime(target)
  22     if t < 0:
  23         print(target)
  24         return
  25
  26     newer = []
  27     removed = []
  28     for dep in deps:
  29         deptime = mtime(dep)
  30         if deptime < 0:
  31             removed.append(dep)
  32         elif mtime(dep) > t:
  33             newer.append(dep)
  34
  35     if newer and removed:
  36         print('Rebuilding %s because %s changed and %s was removed' % (
  37             target, ', '.join(newer), ', '.join(removed)))
  38     elif newer:
  39         print('Rebuilding %s because %s changed' % (target, ', '.join(newer)))
  40     elif removed:
  41         print('Rebuilding %s because %s was removed' % (
  42             target, ', '.join(removed)))
  43     else:
  44         print('Rebuilding %s for an unknown reason' % target)
  45
  46
  47 if __name__ == '__main__':
  48     import sys
  49     rebuild_check(sys.argv[1:])