enhance handling prune for CR

pkg/patterns/declarative/reconciler.go

@@ -74,6 +74,21 @@ type DeclarativeObject interface {
 	metav1.Object
 }
 
+// Pruner is a trait for addon CRDs that determines whether pruning behavior should be enabled for the current CR.
+// To enable this feature, it's necessary to enable WithApplyPrune. If WithApplyPrune is enabled but Pruner is not
+// implemented, Prune behavior is assumed by default.
+type Pruner interface {
+	Prune() bool
+}
+
+// PruneWhiteLister is a trait for addon CRDs that determines which kind of resources should be pruned. It's useful
+// when CR in installed by Addon and want to prune them automatically. The format of array item should be exactly like
+// <group>/<version>/<kind> (core group using 'core' indeed). For example: ["core/v1/ConfigMap", "batch/v1/Job"].
+// Notice: kubeadm has a built-in prune white list, and it will be ignored if this method is implemented.
+type PruneWhiteLister interface {
+	PruneWhiteList() []string
+}
+
 type ErrorResult struct {
 	Result reconcile.Result
 	Err    error
@@ -248,13 +263,20 @@ func (r *Reconciler) reconcileExists(ctx context.Context, name types.NamespacedN
 
 	extraArgs := []string{"--force"}
 
-	if r.options.prune {
+	// allow user disable prune in CR
+	if p, ok := instance.(Pruner); (!ok && r.options.prune) || (ok && r.options.prune && p.Prune()) {
 		var labels []string
 		for k, v := range r.options.labelMaker(ctx, instance) {
 			labels = append(labels, fmt.Sprintf("%s=%s", k, v))
 		}
 
 		extraArgs = append(extraArgs, "--prune", "--selector", strings.Join(labels, ","))
+
+		if lister, ok := instance.(PruneWhiteLister); ok {
+			for _, gvk := range lister.PruneWhiteList() {
+				extraArgs = append(extraArgs, "--prune-whitelist", gvk)
+			}
+		}
 	}
 
 	ns := ""