Check python files for valid license boilerplate

hack/verify-boilerplate.sh

@@ -46,6 +46,9 @@ files_need_boilerplate+=($(${boiler} "go" "${files[@]}"))
 files=($(find_files "sh"))
 files_need_boilerplate+=($(${boiler} "sh" "${files[@]}"))
 
+files=($(find_files "py"))
+files_need_boilerplate+=($(${boiler} "py" "${files[@]}"))
+
 if [[ ${#files_need_boilerplate[@]} -gt 0 ]]; then
   for file in "${files_need_boilerplate[@]}"; do
     echo "Boilerplate header is wrong for: ${file}"

hooks/boilerplate.py.txt

@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+# Copyright 2014 The Kubernetes Authors 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.
+

hooks/prepare-commit-msg

@@ -27,6 +27,12 @@ if [[ ${#files[@]} -gt 0 ]]; then
   files_need_boilerplate+=($("${boiler}" "sh" "${files[@]}"))
 fi
 
+# Check for py files without the required boilerplate.
+files=($(git diff --cached --name-only --diff-filter ACM | grep "\.py" | grep -v -e "third_party" -e "Godeps"))
+if [[ ${#files} -gt 0 ]]; then
+  files_need_boilerplate+=($("${boiler}" "py" "${files[@]}"))
+fi
+
 # Check API schema definitions for field descriptions
 for file in $(git diff --cached --name-only --diff-filter ACM | egrep "pkg/api/v.[^/]*/types\.go" | grep -v "third_party"); do
   # Check for files with fields without description tags