add codegen scripts

Signed-off-by: Kevin Wang <kevinwzf0126@gmail.com>

hack/tools/tools.go

@@ -0,0 +1,7 @@
+// +build tools
+
+package tools
+
+import (
+	_ "k8s.io/code-generator"
+)

hack/update-codegen.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+SCRIPT_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+CODEGEN_PKG=${CODEGEN_PKG:-$(cd "${SCRIPT_ROOT}"; ls -d -1 ./vendor/k8s.io/code-generator 2>/dev/null || echo ../code-generator)}
+
+bash "${CODEGEN_PKG}"/generate-groups.sh "deepcopy,client,informer,lister" \
+  github.com/huawei-cloudnative/karmada/pkg/generated github.com/huawei-cloudnative/karmada/pkg/apis \
+  "propagationstrategy:v1alpha1 membercluster:v1alpha1" \
+  --output-base "$(dirname "${BASH_SOURCE[0]}")/../../../.." \
+  --go-header-file "${SCRIPT_ROOT}"/hack/boilerplate/boilerplate.go.txt

hack/verify-codegen.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+SCRIPT_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
+
+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}"/* "${TMP_DIFFROOT}"
+
+"${SCRIPT_ROOT}/hack/update-codegen.sh"
+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+  echo "${DIFFROOT} is out of date.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 hack/update-codegen.sh"
+  exit 1
+fi