Added script to verify the generated Device Plugin API

Signed-off-by: Renaud Gaubert <rgaubert@nvidia.com>

hack/lib/protoc.sh

@@ -78,3 +78,14 @@ function kube::protoc::format() {
   kube::golang::verify_go_version
   gofmt -l -s -w ${package}/api.pb.go
 }
+
+# Compares the contents of $1 and $2
+# Echo's $3 in case of error and exits 1
+function kube::protoc::diff() {
+  local ret=0
+  diff -I "gzipped FileDescriptorProto" -I "0x" -Naupr ${1} ${2} || ret=$?
+  if [[ $ret -ne 0 ]]; then
+    echo ${3}
+    exit 1
+  fi
+}

hack/verify-generated-device-plugin.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+# Copyright 2017 The Kubernetes Authors.
+#
+# 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.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
+DEVICE_PLUGIN_ROOT="${KUBE_ROOT}/pkg/kubelet/apis/deviceplugin/v1alpha1/"
+ERROR="Device plugin api is out of date. Please run hack/update-generated-device-plugin.sh"
+
+source "${KUBE_ROOT}/hack/lib/protoc.sh"
+kube::golang::setup_env
+
+function cleanup {
+	rm -rf ${DEVICE_PLUGIN_ROOT}/_tmp/
+}
+
+trap cleanup EXIT
+
+mkdir -p ${DEVICE_PLUGIN_ROOT}/_tmp
+cp ${DEVICE_PLUGIN_ROOT}/api.pb.go ${DEVICE_PLUGIN_ROOT}/_tmp/
+
+KUBE_VERBOSE=3 "${KUBE_ROOT}/hack/update-generated-device-plugin.sh"
+kube::protoc::diff "${DEVICE_PLUGIN_ROOT}/api.pb.go" "${DEVICE_PLUGIN_ROOT}/_tmp/api.pb.go" ${ERROR}
+echo "Generated device plugin api is up to date."