Add helper script to regenerate API compatibility data

hack/make-rules/update.sh

@@ -48,6 +48,7 @@ BASH_TARGETS="
 	update-codegen
 	update-generated-runtime
 	update-generated-device-plugin
+	update-generated-api-compatibility-data
 	update-generated-docs
 	update-generated-swagger-docs
 	update-openapi-spec

hack/update-generated-api-compatibility-data.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+
+# Copyright 2019 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[0]}")/..
+source "${KUBE_ROOT}/hack/lib/init.sh"
+
+kube::golang::setup_env
+
+# UPDATE_COMPATIBILITY_FIXTURE_DATA=true regenerates fixture data if needed.
+# -run //HEAD only runs the test cases comparing against testdata for HEAD.
+# We suppress the output because we are expecting to have changes.
+# We suppress the test failure that occurs when there are changes.
+UPDATE_COMPATIBILITY_FIXTURE_DATA=true go test ./vendor/k8s.io/api -run //HEAD >/dev/null 2>&1 || true
+
+# Now that we have regenerated data at HEAD, run the test without suppressing output or failures
+go test ./vendor/k8s.io/api -run //HEAD -count=1