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 errno
   6 import os
   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 deptime > t:
  33             newer.append(dep)
  34
  35     def format_filelist(filelist):
  36         if not filelist:
  37             return None
  38
  39         limit = 5
  40         length = len(filelist)
  41         if length < limit:
  42             return ", ".join(filelist)
  43
  44         truncated = filelist[:limit]
  45         remaining = length - limit
  46
  47         return "%s (and %d other files)" % (", ".join(truncated), remaining)
  48
  49     newer = format_filelist(newer)
  50     removed = format_filelist(removed)
  51
  52     if newer and removed:
  53         print(
  54             "Rebuilding %s because %s changed and %s was removed"
  55             % (target, newer, removed)
  56         )
  57     elif newer:
  58         print("Rebuilding %s because %s changed" % (target, newer))
  59     elif removed:
  60         print("Rebuilding %s because %s was removed" % (target, removed))
  61     else:
  62         print("Rebuilding %s for an unknown reason" % target)
  63
  64
  65 if __name__ == "__main__":
  66     import sys
  67
  68     rebuild_check(sys.argv[1:])