Add input content checking to some build scripts

build/android/gyp/dex.py

 #!/usr/bin/env python
 #
 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import fnmatch
 import optparse
 import os
 import sys
 
+from util import md5_check
+
+BUILD_ANDROID_DIR = os.path.join(os.path.dirname(__file__), '..')
+sys.path.append(BUILD_ANDROID_DIR)
+
 from pylib import build_utils

[Yaron, 2013/04/03 22:05:35]

Is build_utils moving to the gyp dir in another patch?

[cjhopman, 2013/04/03 22:17:56]

Yes.

 
 
 def DoDex(options, paths):
   dx_binary = os.path.join(options.android_sdk_root, 'platform-tools', 'dx')
   dex_cmd = [dx_binary, '--dex', '--output', options.dex_path] + paths
-  build_utils.CheckCallDie(dex_cmd)
+
+  md5_stamp = '%s.md5' % options.dex_path
+  md5_checker = md5_check.Md5Checker(
+      stamp=md5_stamp, inputs=paths, command=dex_cmd)
+  if md5_checker.IsStale():
+    build_utils.CheckCallDie(dex_cmd)
+  else:
+    build_utils.Touch(options.dex_path)
+  md5_checker.Write()
 
 
 def main(argv):
   parser = optparse.OptionParser()
   parser.add_option('--android-sdk-root', help='Android sdk root directory.')
   parser.add_option('--dex-path', help='Dex output path.')
   parser.add_option('--stamp', help='Path to touch on success.')
 
   # TODO(newt): remove this once http://crbug.com/177552 is fixed in ninja.
   parser.add_option('--ignore', help='Ignored.')
 
   options, paths = parser.parse_args()
 
   DoDex(options, paths)
 
   if options.stamp:
     build_utils.Touch(options.stamp)
 
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv))