Patch legacy annotation on pre 0.3 RKE2 control planes

Signed-off-by: Danil-Grigorev <[email protected]>

controlplane/api/v1alpha1/rke2controlplane_types.go

@@ -33,6 +33,10 @@ const (
 	// RKE2ServerConfigurationAnnotation is a machine annotation that stores the json-marshalled string of RKE2Config
 	// This annotation is used to detect any changes in RKE2Config and trigger machine rollout.
 	RKE2ServerConfigurationAnnotation = "controlplane.cluster.x-k8s.io/rke2-server-configuration"
+
+	// LegacyRKE2ControlPlane is a controlplane annotation that marks the CP as legacy. This CP will not provide
+	// etcd certificate management or etcd membership management.
+	LegacyRKE2ControlPlane = "controlplane.cluster.x-k8s.io/legacy"
 )
 
 // RKE2ControlPlaneSpec defines the desired state of RKE2ControlPlane.

controlplane/internal/controllers/rke2controlplane_controller.go

@@ -386,6 +386,12 @@ func (r *RKE2ControlPlaneReconciler) reconcileNormal(
 	logger := log.FromContext(ctx)
 	logger.Info("Reconcile RKE2 Control Plane")
 
+	if rcp.Annotations == nil {
+		rcp.Annotations = map[string]string{}
+	}
+
+	rcp.Annotations[controlplanev1.LegacyRKE2ControlPlane] = ""
+
 	// Wait for the cluster infrastructure to be ready before creating machines
 	if !cluster.Status.InfrastructureReady {
 		logger.Info("Cluster infrastructure is not ready yet")
@@ -527,6 +533,12 @@ func (r *RKE2ControlPlaneReconciler) reconcileDelete(ctx context.Context,
 ) (res ctrl.Result, err error) {
 	logger := log.FromContext(ctx)
 
+	if rcp.Annotations == nil {
+		rcp.Annotations = map[string]string{}
+	}
+
+	rcp.Annotations[controlplanev1.LegacyRKE2ControlPlane] = ""
+
 	// Gets all machines, not just control plane machines.
 	allMachines, err := r.managementCluster.GetMachinesForCluster(ctx, util.ObjectKey(cluster))
 	if err != nil {