fix: Skip namespace creation in --create-namespace when the namespace

Refs #32511

Signed-off-by: SillyZir <269283839+SillyZir@users.noreply.github.com>

pkg/action/install.go

@@ -447,10 +447,20 @@ func (i *Install) RunWithContext(ctx context.Context, ch ci.Charter, vals map[st
 			return nil, err
 		}
 
-		if _, err := i.cfg.KubeClient.Create(
-			resourceList,
-			kube.ClientCreateOptionServerSideApply(i.ServerSideApply, false)); err != nil && !apierrors.IsAlreadyExists(err) {
-			return nil, err
+		// Skip creation if the namespace already exists, as the user may have
+		// permission to get namespaces but not to create them
+		toCreate := resourceList.Filter(func(info *resource.Info) bool {
+			helper := resource.NewHelper(info.Client, info.Mapping)
+			_, err := helper.Get(info.Namespace, info.Name)
+			return err != nil
+		})
+
+		if len(toCreate) > 0 {
+			if _, err := i.cfg.KubeClient.Create(
+				toCreate,
+				kube.ClientCreateOptionServerSideApply(i.ServerSideApply, false)); err != nil && !apierrors.IsAlreadyExists(err) {
+				return nil, err
+			}
 		}
 	}
 

pkg/action/install_create_namespace_test.go

@@ -0,0 +1,142 @@
+/*
+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 action
+
+import (
+	"bytes"
+	"errors"
+	"io"
+	"net/http"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	corev1 "k8s.io/api/core/v1"
+	apierrors "k8s.io/apimachinery/pkg/api/errors"
+	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	kuberuntime "k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/cli-runtime/pkg/resource"
+	"k8s.io/client-go/kubernetes/scheme"
+	"k8s.io/client-go/rest/fake"
+
+	"helm.sh/helm/v4/pkg/kube"
+	kubefake "helm.sh/helm/v4/pkg/kube/fake"
+	rcommon "helm.sh/helm/v4/pkg/release/common"
+)
+
+// existingNamespaceResourceList returns a ResourceList for a namespace that
+// already exists in the cluster: its REST client answers GETs with the
+// namespace object.
+func existingNamespaceResourceList(name string) kube.ResourceList {
+	obj := &corev1.Namespace{
+		ObjectMeta: metav1.ObjectMeta{
+			Name: name,
+		},
+	}
+
+	corev1GV := schema.GroupVersion{Version: "v1"}
+	corev1Codec := scheme.Codecs.CodecForVersions(scheme.Codecs.LegacyCodec(corev1GV), scheme.Codecs.UniversalDecoder(corev1GV), corev1GV, corev1GV)
+	body := []byte(kuberuntime.EncodeOrDie(corev1Codec, obj))
+
+	resInfo := resource.Info{
+		Name: name,
+		Mapping: &meta.RESTMapping{
+			Resource:         schema.GroupVersionResource{Version: "v1", Resource: "namespaces"},
+			GroupVersionKind: schema.GroupVersionKind{Version: "v1", Kind: "Namespace"},
+			Scope:            meta.RESTScopeRoot,
+		},
+		Object: obj,
+	}
+	resInfo.Client = &fake.RESTClient{
+		GroupVersion:         corev1GV,
+		NegotiatedSerializer: scheme.Codecs.WithoutConversion(),
+		Client: fake.CreateHTTPClient(func(_ *http.Request) (*http.Response, error) {
+			header := http.Header{}
+			header.Set("Content-Type", kuberuntime.ContentTypeJSON)
+			return &http.Response{
+				StatusCode: http.StatusOK,
+				Header:     header,
+				Body:       io.NopCloser(bytes.NewReader(body)),
+			}, nil
+		}),
+	}
+	var resourceList kube.ResourceList
+	resourceList.Append(&resInfo)
+	return resourceList
+}
+
+// namespaceCreateForbiddenKubeClient simulates a user whose RBAC role allows
+// reading namespaces but not creating them: any attempt to create a Namespace
+// is rejected with a Forbidden error, while the namespace itself already
+// exists in the cluster.
+type namespaceCreateForbiddenKubeClient struct {
+	kubefake.FailingKubeClient
+	nsResources kube.ResourceList
+}
+
+func (f *namespaceCreateForbiddenKubeClient) Build(r io.Reader, validate bool) (kube.ResourceList, error) {
+	buf, err := io.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	if strings.Contains(string(buf), "kind: Namespace") {
+		return f.nsResources, nil
+	}
+	return f.FailingKubeClient.Build(bytes.NewReader(buf), validate)
+}
+
+func (f *namespaceCreateForbiddenKubeClient) Create(resources kube.ResourceList, options ...kube.ClientCreateOption) (*kube.Result, error) {
+	for _, info := range resources {
+		if info.Mapping != nil && info.Mapping.GroupVersionKind.Kind == "Namespace" {
+			return nil, apierrors.NewForbidden(
+				schema.GroupResource{Resource: "namespaces"},
+				info.Name,
+				errors.New(`User "system:serviceaccount:mcp:mcp" cannot create resource "namespaces" in API group "" at the cluster scope`),
+			)
+		}
+	}
+	return f.FailingKubeClient.Create(resources, options...)
+}
+
+func TestInstallReleaseCreateNamespace_NamespaceExistsWithoutCreatePermission(t *testing.T) {
+	is := assert.New(t)
+	req := require.New(t)
+
+	config := actionConfigFixture(t)
+	config.KubeClient = &namespaceCreateForbiddenKubeClient{
+		FailingKubeClient: kubefake.FailingKubeClient{PrintingKubeClient: kubefake.PrintingKubeClient{Out: io.Discard}},
+		nsResources:       existingNamespaceResourceList("spaced"),
+	}
+	instAction := installActionWithConfig(config)
+	instAction.CreateNamespace = true
+
+	resi, err := instAction.Run(buildChart(), map[string]any{})
+	req.NoError(err, "--create-namespace must not fail when the namespace already exists and the user may not create namespaces")
+	res, err := releaserToV1Release(resi)
+	req.NoError(err)
+
+	r, err := instAction.cfg.Releases.Get(res.Name, res.Version)
+	req.NoError(err)
+	rel, err := releaserToV1Release(r)
+	req.NoError(err)
+
+	is.Equal(rcommon.StatusDeployed, rel.Info.Status)
+	is.Equal("Install complete", rel.Info.Description)
+}