add delete type override

apis/placement/v1alpha1/override_types.go

@@ -56,6 +56,7 @@ type OverridePolicy struct {
 	// OverrideRules defines an array of override rules to be applied on the selected resources.
 	// The order of the rules determines the override order.
 	// When there are two rules selecting the same fields on the target cluster, the last one will win.
+	// There can only be one override rule if it is a `Delete` type override rule.
 	// You can have 1-20 rules.
 	// +kubebuilder:validation:Required
 	// +kubebuilder:validation:MinItems=1
@@ -66,6 +67,12 @@ type OverridePolicy struct {
 
 // OverrideRule defines how to override the selected resources on the target clusters.
 type OverrideRule struct {
+	// OverrideType defines the type of the override rules.
+	// +kubebuilder:validation:Enum=JSONPatch;Delete
+	// +kubebuilder:default:JSONPatch
+	// +optional
+	OverrideType OverrideType `json:"overrideType,omitempty"`
+
 	// ClusterSelectors selects the target clusters.
 	// The resources will be overridden before applying to the matching clusters.
 	// An empty clusterSelector selects ALL the member clusters.
@@ -78,10 +85,21 @@ type OverrideRule struct {
 	// +kubebuilder:validation:Required
 	// +kubebuilder:validation:MinItems=1
 	// +kubebuilder:validation:MaxItems=20
-	// +required
-	JSONPatchOverrides []JSONPatchOverride `json:"jsonPatchOverrides"`
+	// +optional
+	JSONPatchOverrides []JSONPatchOverride `json:"jsonPatchOverrides,omitempty"`
 }
 
+// OverrideType defines the type of Override
+type OverrideType string
+
+const (
+	// JSONPatchOverrideType applies a JSON patch on the selected resources following [RFC 6902](https://datatracker.ietf.org/doc/html/rfc6902).
+	JSONPatchOverrideType OverrideType = "JSONPatch"
+
+	// DeleteOverrideType deletes the selected resources on the target clusters.
+	DeleteOverrideType OverrideType = "Delete"
+)
+
 // +genclient
 // +genclient:Namespaced
 // +kubebuilder:object:root=true

pkg/controllers/updaterun/controller.go

@@ -11,8 +11,6 @@ import (
 	"fmt"
 	"time"
 
-	"go.goms.io/fleet/pkg/utils"
-	"go.goms.io/fleet/pkg/utils/controller"
 	"k8s.io/apimachinery/pkg/types"
 	"k8s.io/client-go/tools/record"
 	"k8s.io/client-go/util/workqueue"
@@ -27,6 +25,8 @@ import (
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
 
 	placementv1alpha1 "go.goms.io/fleet/apis/placement/v1alpha1"
+	"go.goms.io/fleet/pkg/utils"
+	"go.goms.io/fleet/pkg/utils/controller"
 )
 
 // Reconciler reconciles a ClusterStagedUpdateRun object.

pkg/controllers/updaterun/controller_test.go

@@ -8,11 +8,12 @@ package updaterun
 import (
 	"testing"
 
-	placementv1alpha1 "go.goms.io/fleet/apis/placement/v1alpha1"
 	"k8s.io/client-go/util/workqueue"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/controller/controllertest"
 	"sigs.k8s.io/controller-runtime/pkg/reconcile"
+
+	placementv1alpha1 "go.goms.io/fleet/apis/placement/v1alpha1"
 )
 
 func TestHandleClusterApprovalRequest(t *testing.T) {