add codegen validation

Add a check validating that generated code is up to date. This would
fail on travis in case a contributor forget to run `make generate-api`.

Signed-off-by: Petr Horacek <phoracek@redhat.com>

Makefile

@@ -20,7 +20,7 @@ goimports:
 whitespace:
 	./hack/whitespace.sh --fix
 
-check: whitespace-check vet goimports-check test
+check: whitespace-check vet goimports-check generate-api-check test
 
 whitespace-check:
 	./hack/whitespace.sh
@@ -77,11 +77,14 @@ generate-manifests:
 	SRIOV_DP_IMAGE=$(SRIOV_DP_IMAGE) \
 	SRIOV_CNI_IMAGE=$(SRIOV_CNI_IMAGE) \
 	KUBEMACPOOL_IMAGE=$(KUBEMACPOOL_IMAGE) \
-		./hack/build-manifests.sh
+		./hack/generated-manifests.sh
 
 generate-api:
 	operator-sdk generate k8s
 
+generate-api-check:
+	./hack/verify-codegen.sh
+
 .PHONY:
 	all \
 	check \

hack/verify-codegen.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+SCRIPT_ROOT=$(dirname "${BASH_SOURCE}")/..
+DIFFROOT="${SCRIPT_ROOT}/pkg"
+TMP_DIFFROOT="${SCRIPT_ROOT}/_tmp/pkg"
+_tmp="${SCRIPT_ROOT}/_tmp"
+
+cleanup() {
+    rm -rf "${_tmp}"
+}
+trap "cleanup" EXIT SIGINT
+
+cleanup
+
+mkdir -p "${TMP_DIFFROOT}"
+cp -a "${DIFFROOT}"/* "${TMP_DIFFROOT}"
+
+make generate-api
+echo "diffing ${DIFFROOT} against freshly generated codegen"
+ret=0
+diff -Naupr "${DIFFROOT}" "${TMP_DIFFROOT}" || ret=$?
+cp -a "${TMP_DIFFROOT}"/* "${DIFFROOT}"
+if [[ $ret -eq 0 ]]
+then
+    echo "${DIFFROOT} up to date."
+else
+    echo "${DIFFROOT} is out of date. Please run `make generate-api`"
+    exit 1
+fi