Implement the configuration for labels and annotations

config/crd/bases/operator.knative.dev_knativeeventings.yaml

@@ -1142,6 +1142,20 @@ spec:
                             type: object
                         type: object
                       type: array
+              namespace:
+                description: A field of namespace name to override the labels and annotations
+                type: object
+                properties:
+                  labels:
+                    additionalProperties:
+                      type: string
+                    description: Labels overrides labels for the namespace and its template.
+                    type: object
+                  annotations:
+                    additionalProperties:
+                      type: string
+                    description: Annotations overrides labels for the namespace and its template.
+                    type: object
               deployments:
                 description: A mapping of deployment name to override
                 type: array

config/crd/bases/operator.knative.dev_knativeservings.yaml

@@ -1153,6 +1153,20 @@ spec:
                             type: object
                         type: object
                       type: array
+              namespace:
+                description: A field of namespace name to override the labels and annotations
+                type: object
+                properties:
+                  labels:
+                    additionalProperties:
+                      type: string
+                    description: Labels overrides labels for the namespace and its template.
+                    type: object
+                  annotations:
+                    additionalProperties:
+                      type: string
+                    description: Annotations overrides labels for the namespace and its template.
+                    type: object
               deployments:
                 description: A mapping of deployment name to override
                 type: array

pkg/apis/operator/base/common.go

@@ -65,6 +65,9 @@ type KComponentSpec interface {
 	// GetAdditionalManifests gets the list of additional manifests, which should be installed
 	GetAdditionalManifests() []Manifest
 
+	// GetNamespaceConfiguration gets the labels and annotations for the namespace
+	GetNamespaceConfiguration() *NamespaceConfiguration
+
 	// GetHighAvailability returns means to set the number of desired replicas
 	GetHighAvailability() *HighAvailability
 
@@ -142,6 +145,10 @@ type CommonSpec struct {
 	// +optional
 	DeploymentOverride []WorkloadOverride `json:"deployments,omitempty"`
 
+	// NamespaceConfiguration overrides namespace configurations such as labels and annotations.
+	// +optional
+	NamespaceConfiguration *NamespaceConfiguration `json:"namespace,omitempty"`
+
 	// Workloads overrides workloads configurations such as resources and replicas.
 	// +optional
 	Workloads []WorkloadOverride `json:"workloads,omitempty"`
@@ -191,6 +198,11 @@ func (c *CommonSpec) GetVersion() string {
 	return c.Version
 }
 
+// GetNamespaceConfiguration implements KComponentSpec.
+func (c *CommonSpec) GetNamespaceConfiguration() *NamespaceConfiguration {
+	return c.NamespaceConfiguration
+}
+
 // GetManifests implements KComponentSpec.
 func (c *CommonSpec) GetManifests() []Manifest {
 	return c.Manifests
@@ -247,6 +259,17 @@ type Registry struct {
 	ImagePullSecrets []corev1.LocalObjectReference `json:"imagePullSecrets,omitempty"`
 }
 
+// NamespaceConfiguration defines the configurations of namespaces to override.
+type NamespaceConfiguration struct {
+	// Labels overrides labels for the namespace and its template.
+	// +optional
+	Labels map[string]string `json:"labels,omitempty"`
+
+	// Annotations overrides labels for the namespace and its template.
+	// +optional
+	Annotations map[string]string `json:"annotations,omitempty"`
+}
+
 // WorkloadOverride defines the configurations of deployments to override.
 type WorkloadOverride struct {
 	// Name is the name of the deployment to override.

pkg/reconciler/common/namespace.go

@@ -0,0 +1,65 @@
+/*
+Copyright 2024 The Knative 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 common
+
+import (
+	mf "github.com/manifestival/manifestival"
+	corev1 "k8s.io/api/core/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/client-go/kubernetes/scheme"
+
+	"knative.dev/operator/pkg/apis/operator/base"
+)
+
+// NamespaceConfigurationTransform mutates the only namespace available for knative serving or eventing
+// by changing the labels and annotations.
+func NamespaceConfigurationTransform(namespaceConfiguration *base.NamespaceConfiguration) mf.Transformer {
+	return func(u *unstructured.Unstructured) error {
+		if u.GetKind() != "Namespace" || namespaceConfiguration == nil {
+			return nil
+		}
+		namespace := &corev1.Namespace{}
+		err := scheme.Scheme.Convert(u, namespace, nil)
+		if err != nil {
+			return err
+		}
+
+		// Override the labels for the namespace
+		if namespace.GetLabels() == nil {
+			namespace.Labels = map[string]string{}
+		}
+
+		for key, val := range namespaceConfiguration.Labels {
+			namespace.Labels[key] = val
+		}
+
+		// Override the annotations for the namespace
+		if namespace.GetAnnotations() == nil {
+			namespace.Annotations = map[string]string{}
+		}
+
+		for key, val := range namespaceConfiguration.Annotations {
+			namespace.Annotations[key] = val
+		}
+
+		err = scheme.Scheme.Convert(namespace, u, nil)
+		if err != nil {
+			return err
+		}
+		return nil
+	}
+}

pkg/reconciler/common/namespace_test.go

@@ -0,0 +1,121 @@
+/*
+Copyright 2024 The Knative 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 common
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/client-go/kubernetes/scheme"
+
+	"knative.dev/operator/pkg/apis/operator/base"
+)
+
+func TestNamespaceConfigurationTransform(t *testing.T) {
+	tests := []struct {
+		name           string
+		namespace      *corev1.Namespace
+		override       *base.NamespaceConfiguration
+		expLabels      map[string]string
+		expAnnotations map[string]string
+	}{{
+		name: "Label override",
+		namespace: &corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "knative-serving",
+				Labels: map[string]string{
+					"istio-injection":             "enabled",
+					"serving.knative.dev/release": "v0.13.0",
+				},
+			},
+		},
+		override: &base.NamespaceConfiguration{
+			Labels: map[string]string{"a": "b"},
+		},
+		expLabels:      map[string]string{"a": "b", "istio-injection": "enabled", "serving.knative.dev/release": "v0.13.0"},
+		expAnnotations: nil,
+	}, {
+		name: "Annotation override",
+		namespace: &corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "knative-serving",
+				Labels: map[string]string{
+					"istio-injection":             "enabled",
+					"serving.knative.dev/release": "v0.13.0",
+				},
+			},
+		},
+		override: &base.NamespaceConfiguration{
+			Annotations: map[string]string{"c": "d"},
+		},
+		expLabels:      map[string]string{"istio-injection": "enabled", "serving.knative.dev/release": "v0.13.0"},
+		expAnnotations: map[string]string{"c": "d"},
+	}, {
+		name: "No override",
+		namespace: &corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "knative-serving",
+				Labels: map[string]string{
+					"istio-injection":             "enabled",
+					"serving.knative.dev/release": "v0.13.0",
+				},
+			},
+		},
+		override:       nil,
+		expLabels:      map[string]string{"serving.knative.dev/release": "v0.13.0", "istio-injection": "enabled"},
+		expAnnotations: nil,
+	}, {
+		name: "Override both labels and annotations",
+		namespace: &corev1.Namespace{
+			ObjectMeta: metav1.ObjectMeta{
+				Name: "knative-serving",
+			},
+		},
+		override: &base.NamespaceConfiguration{
+			Labels:      map[string]string{"c1": "d1", "j": "k"},
+			Annotations: map[string]string{"c": "d", "x": "y"},
+		},
+		expLabels:      map[string]string{"j": "k", "c1": "d1"},
+		expAnnotations: map[string]string{"x": "y", "c": "d"},
+	}}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			u := &unstructured.Unstructured{}
+			err := scheme.Scheme.Convert(test.namespace, u, nil)
+			if err != nil {
+				t.Fatalf("Failed to convert namespace to unstructured: %v", err)
+			}
+			NamespaceConfigurationTransform(test.override)(u)
+			got := &corev1.Namespace{}
+			if err = scheme.Scheme.Convert(u, got, nil); err != nil {
+				t.Fatalf("Failed to convert unstructured to namespace: %v", err)
+			}
+
+			if diff := cmp.Diff(got.GetLabels(), test.expLabels); diff != "" {
+				t.Fatalf("Unexpected labels: %v", diff)
+			}
+
+			if diff := cmp.Diff(got.GetAnnotations(), test.expAnnotations); diff != "" {
+				t.Fatalf("Unexpected annotations: %v", diff)
+			}
+		})
+	}
+}

pkg/reconciler/common/transformers.go

@@ -30,6 +30,7 @@ func transformers(ctx context.Context, obj base.KComponent) []mf.Transformer {
 	return []mf.Transformer{
 		injectOwner(obj),
 		mf.InjectNamespace(obj.GetNamespace()),
+		NamespaceConfigurationTransform(obj.GetSpec().GetNamespaceConfiguration()),
 		HighAvailabilityTransform(obj),
 		ImageTransform(obj.GetSpec().GetRegistry(), logger),
 		JobTransform(obj),