Convert update tool into python for easier hackability

tools/update.py

Index: tools/update.py
diff --git a/tools/update.py b/tools/update.py
new file mode 100755
index 0000000000000000000000000000000000000000..d7b30fcfc095cb79e5c67b74104096bd606c3896
--- /dev/null
+++ b/tools/update.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# Copyright (c) 2011 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 os
+import subprocess
+import sys
+
+ROOT = os.path.dirname(os.path.abspath(os.path.dirname(__file__)))
+APPCFG = os.path.join(ROOT, '..', 'google_appengine', 'appcfg.py')
+
+INSTANCES = [
+  'chromeos-status',
+  'chromium-status',
+  'chromiumos-status',
+  'gyp-status',
+  'naclports-status',
+  'naclsdk-status',
+  'nativeclient-status',
+  'o3d-status',
+]
+
+def main():
+  if not sys.argv[1:]:
+    print('Usage: update.py <appcfg.py command> -v <version to use>\n')
+    print('The following instances will be affected:')
+    for instance in INSTANCES:
+      print('  %s' % instance)
+    print('')
+    return 1
+
+  command = sys.argv[1:]
+  for instance in INSTANCES:
+    print('\nDoing %s' % instance)
+    subprocess.check_call([APPCFG] + command + [ROOT, '-A', instance])
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main())