🐛 skip mutation handler when received deletion verb

Signed-off-by: AnyISalIn <[email protected]>

Author: AnyISalIn

pkg/webhook/admission/defaulter.go

@@ -21,6 +21,8 @@ import (
 	"encoding/json"
 	"net/http"
 
+	admissionv1 "k8s.io/api/admission/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
@@ -56,6 +58,17 @@ func (h *mutatingHandler) Handle(ctx context.Context, req Request) Response {
 		panic("defaulter should never be nil")
 	}
 
+	// always skip when a DELETE operation received in mutation handler
+	// describe in https://github.com/kubernetes-sigs/controller-runtime/issues/1762
+	if req.Operation == admissionv1.Delete {
+		return Response{AdmissionResponse: admissionv1.AdmissionResponse{
+			Allowed: true,
+			Result: &metav1.Status{
+				Code: http.StatusOK,
+			},
+		}}
+	}
+
 	// Get the object in the request
 	obj := h.defaulter.DeepCopyObject().(Defaulter)
 	if err := h.decoder.Decode(req, obj); err != nil {