Merge pull request #10822 from srm09/add-uid-to-cluster-builtins

✨ Extend cluster builtin to include UID

Author: k8s-ci-robot

docs/book/src/tasks/experimental-features/cluster-class/write-clusterclass.md

@@ -532,7 +532,7 @@ spec:
 
 In addition to variables specified in the ClusterClass, the following builtin variables can be 
 referenced in patches:
-- `builtin.cluster.{name,namespace}`
+- `builtin.cluster.{name,namespace,uid}`
 - `builtin.cluster.topology.{version,class}`
 - `builtin.cluster.network.{serviceDomain,services,pods,ipFamily}`
     - Note: ipFamily is deprecated and will be removed in a future release. see https://github.com/kubernetes-sigs/cluster-api/issues/7521.

exp/runtime/hooks/api/v1alpha1/topologymutation_variable_types.go

@@ -16,6 +16,8 @@ limitations under the License.
 
 package v1alpha1
 
+import "k8s.io/apimachinery/pkg/types"
+
 // BuiltinsName is the name of the builtin variable.
 const BuiltinsName = "builtin"
 
@@ -35,6 +37,9 @@ type ClusterBuiltins struct {
 	// Namespace is the namespace of the cluster.
 	Namespace string `json:"namespace,omitempty"`
 
+	// UID is the unqiue identifier of the cluster.
+	UID types.UID `json:"uid,omitempty"`
+
 	// Topology represents the cluster topology variables.
 	Topology *ClusterTopologyBuiltins `json:"topology,omitempty"`
 

exp/runtime/hooks/api/v1alpha1/zz_generated.openapi.go

@@ -28,6 +28,7 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/uuid"
 	utilfeature "k8s.io/component-base/featuregate/testing"
 	"k8s.io/utils/ptr"
 	. "sigs.k8s.io/controller-runtime/pkg/envtest/komega"
@@ -1073,6 +1074,7 @@ func setupTestObjects() (*scope.ClusterBlueprint, *scope.ClusterState) {
 		ObjectMeta: metav1.ObjectMeta{
 			Name:      "cluster1",
 			Namespace: metav1.NamespaceDefault,
+			UID:       uuid.NewUUID(),
 		},
 		Spec: clusterv1.ClusterSpec{
 			Paused: false,

internal/controllers/topology/cluster/patches/engine_test.go

@@ -61,6 +61,7 @@ func Global(clusterTopology *clusterv1.Topology, cluster *clusterv1.Cluster, def
 		Cluster: &runtimehooksv1.ClusterBuiltins{
 			Name:      cluster.Name,
 			Namespace: cluster.Namespace,
+			UID:       cluster.UID,
 			Topology: &runtimehooksv1.ClusterTopologyBuiltins{
 				Version: cluster.Spec.Topology.Version,
 				Class:   cluster.GetClassKey().Name,

internal/controllers/topology/cluster/patches/variables/variables.go

@@ -25,6 +25,7 @@ import (
 	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/utils/ptr"
 
 	clusterv1 "sigs.k8s.io/cluster-api/api/v1beta1"
@@ -34,6 +35,7 @@ import (
 )
 
 func TestGlobal(t *testing.T) {
+	clusterUID := "8a35f406-6b9b-4b78-8c93-a7f878d90623"
 	tests := []struct {
 		name                        string
 		clusterTopology             *clusterv1.Topology
@@ -68,6 +70,7 @@ func TestGlobal(t *testing.T) {
 				ObjectMeta: metav1.ObjectMeta{
 					Name:      "cluster1",
 					Namespace: metav1.NamespaceDefault,
+					UID:       types.UID(clusterUID),
 				},
 				Spec: clusterv1.ClusterSpec{
 					Topology: &clusterv1.Topology{
@@ -100,6 +103,7 @@ func TestGlobal(t *testing.T) {
 					"cluster":{
 						"name": "cluster1",
   						"namespace": "default",
+						"uid": "8a35f406-6b9b-4b78-8c93-a7f878d90623",
  						 "topology":{
   						  	"version": "v1.21.1",
  						   	"class": "clusterClass1"
@@ -149,6 +153,7 @@ func TestGlobal(t *testing.T) {
 				ObjectMeta: metav1.ObjectMeta{
 					Name:      "cluster1",
 					Namespace: metav1.NamespaceDefault,
+					UID:       types.UID(clusterUID),
 				},
 				Spec: clusterv1.ClusterSpec{
 					Topology: &clusterv1.Topology{
@@ -181,6 +186,7 @@ func TestGlobal(t *testing.T) {
 					"cluster":{
 						"name": "cluster1",
   						"namespace": "default",
+						"uid": "8a35f406-6b9b-4b78-8c93-a7f878d90623",
  						 "topology":{
   						  	"version": "v1.21.1",
  						   	"class": "clusterClass1"
@@ -221,6 +227,7 @@ func TestGlobal(t *testing.T) {
 				ObjectMeta: metav1.ObjectMeta{
 					Name:      "cluster1",
 					Namespace: metav1.NamespaceDefault,
+					UID:       types.UID(clusterUID),
 				},
 				Spec: clusterv1.ClusterSpec{
 					Topology: &clusterv1.Topology{
@@ -252,6 +259,7 @@ func TestGlobal(t *testing.T) {
 					"cluster":{
 						"name": "cluster1",
   						"namespace": "default",
+						"uid": "8a35f406-6b9b-4b78-8c93-a7f878d90623",
  						 "topology":{
   						  	"version": "v1.21.1",
  						   	"class": "clusterClass1"
@@ -291,6 +299,7 @@ func TestGlobal(t *testing.T) {
 				ObjectMeta: metav1.ObjectMeta{
 					Name:      "cluster1",
 					Namespace: metav1.NamespaceDefault,
+					UID:       types.UID(clusterUID),
 				},
 				Spec: clusterv1.ClusterSpec{
 					Topology: &clusterv1.Topology{
@@ -319,6 +328,7 @@ func TestGlobal(t *testing.T) {
 					"cluster":{
   						"name": "cluster1",
   						"namespace": "default",
+						"uid": "8a35f406-6b9b-4b78-8c93-a7f878d90623",
  						"topology":{
     						"version": "v1.21.1",
     						"class": "clusterClass1"
@@ -357,6 +367,7 @@ func TestGlobal(t *testing.T) {
 				ObjectMeta: metav1.ObjectMeta{
 					Name:      "cluster1",
 					Namespace: metav1.NamespaceDefault,
+					UID:       types.UID(clusterUID),
 				},
 				Spec: clusterv1.ClusterSpec{
 					Topology: &clusterv1.Topology{
@@ -381,6 +392,7 @@ func TestGlobal(t *testing.T) {
 					"cluster":{
   						"name": "cluster1",
   						"namespace": "default",
+						"uid": "8a35f406-6b9b-4b78-8c93-a7f878d90623",
   						"topology":{
 							"version": "v1.21.1",
    						 	"class": "clusterClass1"

internal/controllers/topology/cluster/patches/variables/variables_test.go

@@ -471,6 +471,7 @@ var builtinVariables = sets.Set[string]{}.Insert(
 	"builtin.cluster",
 	"builtin.cluster.name",
 	"builtin.cluster.namespace",
+	"builtin.cluster.uid",
 
 	// ClusterTopology builtins.
 	"builtin.cluster.topology",