Build runtime Docker images.

Also added release process to push these images to GCS.

build/json-extractor.py

@@ -0,0 +1,70 @@
+#!/usr/bin/env python
+
+# Copyright 2014 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This is a very simple utility that reads a JSON document from stdin, parses it
+# and returns the specified value.  The value is described using a simple dot
+# notation.  If any errors are encountered along the way, an error is output and
+# a failure value is returned.
+
+from __future__ import print_function
+
+import json
+import sys
+
+def PrintError(*err):
+  print(*err, file=sys.stderr)
+
+def main():
+  try:
+    obj = json.load(sys.stdin)
+  except Exception, e:
+    PrintError("Error loading JSON: {0}".format(str(e)))
+
+  if len(sys.argv) == 1:
+    # if we don't have a query string, return success
+    return 0
+  elif len(sys.argv) > 2:
+    PrintError("Usage: {0} <json query>".format(sys.args[0]))
+    return 1
+
+  query_list = sys.argv[1].split('.')
+  for q in query_list:
+    if isinstance(obj, dict):
+      if q not in obj:
+        PrintError("Couldn't find '{0}' in dict".format(q))
+        return 1
+      obj = obj[q]
+    elif isinstance(obj, list):
+      try:
+        index = int(q)
+      except:
+        PrintError("Can't use '{0}' to index into array".format(q))
+        return 1
+      if index >= len(obj):
+        PrintError("Index ({0}) is greater than length of list ({1})".format(q, len(obj)))
+        return 1
+      obj = obj[index]
+    else:
+      PrintError("Trying to query non-queryable object: {0}".format(q))
+      return 1
+
+  if isinstance(obj, str):
+    print(obj)
+  else:
+    print(json.dumps(obj, indent=2))
+
+if __name__ == "__main__":
+  sys.exit(main())