Implement helm.sh/resource-deletion-policy annotation to override deletion cascade per resource

Signed-off-by: Danil Grigorev <danil.grigorev@suse.com>

pkg/kube/client.go

@@ -484,7 +484,15 @@ func rdelete(c *Client, resources ResourceList, propagation metav1.DeletionPropa
 	mtx := sync.Mutex{}
 	err := perform(resources, func(info *resource.Info) error {
 		c.Log("Starting delete for %q %s", info.Name, info.Mapping.GroupVersionKind.Kind)
-		err := deleteResource(info, propagation)
+		propagationPolicy := propagation
+		if annotations, err := metadataAccessor.Annotations(info.Object); err != nil {
+			c.Log("Unable to get annotations on %q, err: %s", info.Name, err)
+			errs = append(errs, err)
+		} else if annotations != nil && annotations[ResourceDeletionPolicyAnno] != "" {
+			propagationPolicy = selectDeletionPolicy(annotations[ResourceDeletionPolicyAnno], propagation)
+		}
+
+		err := deleteResource(info, propagationPolicy)
 		if err == nil || apierrors.IsNotFound(err) {
 			if err != nil {
 				c.Log("Ignoring delete failure for %q %s: %v", info.Name, info.Mapping.GroupVersionKind, err)

pkg/kube/client_test.go

@@ -213,6 +213,93 @@ func TestUpdate(t *testing.T) {
 	}
 }
 
+func TestDelete(t *testing.T) {
+	listA := newPodList("starfish", "otter", "squid", "jellyfish")
+	listA.Items[0].Annotations = map[string]string{
+		ResourceDeletionPolicyAnno: "foreground",
+	}
+	listA.Items[1].Annotations = map[string]string{
+		ResourceDeletionPolicyAnno: "orphan",
+	}
+	listA.Items[2].Annotations = map[string]string{
+		ResourceDeletionPolicyAnno: "background",
+	}
+	listA.Items[3].Annotations = map[string]string{
+		ResourceDeletionPolicyAnno: "oops",
+	}
+
+	var actions []string
+
+	c := newTestClient(t)
+	c.Factory.(*cmdtesting.TestFactory).UnstructuredClient = &fake.RESTClient{
+		NegotiatedSerializer: unstructuredSerializer,
+		Client: fake.CreateHTTPClient(func(req *http.Request) (*http.Response, error) {
+			p, m := req.URL.Path, req.Method
+			b, err := io.ReadAll(req.Body)
+			if err != nil {
+				t.Fatal(err)
+			}
+			req.Body.Close()
+			actions = append(actions, p+":"+m)
+			t.Logf("got request %s %s", p, m)
+			switch {
+			case p == "/namespaces/default/pods/jellyfish" && m == "DELETE" && string(b) == "{\"propagationPolicy\":\"Background\"}\n":
+				return newResponse(200, &listA.Items[3])
+			case p == "/namespaces/default/pods/squid" && m == "DELETE" && string(b) == "{\"propagationPolicy\":\"Background\"}\n":
+				return newResponse(200, &listA.Items[2])
+			case p == "/namespaces/default/pods/otter" && m == "DELETE" && string(b) == "{\"propagationPolicy\":\"Orphan\"}\n":
+				return newResponse(200, &listA.Items[1])
+			case p == "/namespaces/default/pods/starfish" && m == "DELETE" && string(b) == "{\"propagationPolicy\":\"Foreground\"}\n":
+				return newResponse(200, &listA.Items[0])
+			default:
+				t.Fatalf("unexpected request: %s %s", req.Method, req.URL.Path)
+				return nil, nil
+			}
+		}),
+	}
+	first, err := c.Build(objBody(&listA), false)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	result, errs := c.Delete(first)
+	if len(errs) > 0 {
+		t.Fatal(errs)
+	}
+
+	if len(result.Created) != 0 {
+		t.Errorf("expected 0 resource created, got %d", len(result.Created))
+	}
+	if len(result.Updated) != 0 {
+		t.Errorf("expected 0 resource updated, got %d", len(result.Updated))
+	}
+	if len(result.Deleted) != 4 {
+		t.Errorf("expected 4 resource deleted, got %d", len(result.Deleted))
+	}
+
+	expectedActions := []string{
+		"/namespaces/default/pods/squid:DELETE",
+		"/namespaces/default/pods/starfish:DELETE",
+		"/namespaces/default/pods/otter:DELETE",
+		"/namespaces/default/pods/jellyfish:DELETE",
+	}
+	if len(expectedActions) != len(actions) {
+		t.Fatalf("unexpected number of requests, expected %d, got %d", len(expectedActions), len(actions))
+	}
+	for _, v := range expectedActions {
+		found := false
+		for _, action := range actions {
+			if action == v {
+				found = true
+			}
+		}
+
+		if !found {
+			t.Errorf("expected %s request got %#v", v, actions)
+		}
+	}
+}
+
 func TestBuild(t *testing.T) {
 	tests := []struct {
 		name      string

pkg/kube/resource_delete_policy.go

@@ -0,0 +1,40 @@
+/*
+Copyright The Helm Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package kube // import "helm.sh/helm/v3/pkg/kube"
+
+import (
+	"strings"
+
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+const ResourceDeletionPolicyAnno = "helm.sh/resource-deletion-policy"
+
+// selectDeletionPolicy allows to select an override deleteion policy per resource,
+// based on ResourceDeletionPolicyAnno.
+func selectDeletionPolicy(policyAnnotation string, defualt v1.DeletionPropagation) v1.DeletionPropagation {
+	switch policyAnnotation {
+	case strings.ToLower(string(v1.DeletePropagationBackground)):
+		return v1.DeletePropagationBackground
+	case strings.ToLower(string(v1.DeletePropagationForeground)):
+		return v1.DeletePropagationForeground
+	case strings.ToLower(string(v1.DeletePropagationOrphan)):
+		return v1.DeletePropagationOrphan
+	default:
+		return defualt
+	}
+}