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 from __future__ import absolute_import, print_function, unicode_literals
   6 import os
   7 import errno
   8
   9
  10 def mtime(path):
  11     try:
  12         return os.stat(path).st_mtime
  13     except OSError as e:
  14         if e.errno == errno.ENOENT:
  15             return -1
  16         raise
  17
  18
  19 def rebuild_check(args):
  20     target = args[0]
  21     deps = args[1:]
  22     t = mtime(target)
  23     if t < 0:
  24         print(target)
  25         return
  26
  27     newer = []
  28     removed = []
  29     for dep in deps:
  30         deptime = mtime(dep)
  31         if deptime < 0:
  32             removed.append(dep)
  33         elif deptime > t:
  34             newer.append(dep)
  35
  36     def format_filelist(filelist):
  37         if not filelist:
  38             return None
  39
  40         limit = 5
  41         length = len(filelist)
  42         if length < limit:
  43             return ', '.join(filelist)
  44
  45         truncated = filelist[:limit]
  46         remaining = length - limit
  47
  48         return '%s (and %d other files)' % (', '.join(truncated), remaining)
  49
  50     newer = format_filelist(newer)
  51     removed = format_filelist(removed)
  52
  53     if newer and removed:
  54         print('Rebuilding %s because %s changed and %s was removed' % (
  55             target, newer, removed))
  56     elif newer:
  57         print('Rebuilding %s because %s changed' % (target, newer))
  58     elif removed:
  59         print('Rebuilding %s because %s was removed' % (
  60             target, removed))
  61     else:
  62         print('Rebuilding %s for an unknown reason' % target)
  63
  64
  65 if __name__ == '__main__':
  66     import sys
  67     rebuild_check(sys.argv[1:])