add labels to namespace

Adds `lokomotive.kinvolk.io/name: <namespace-name>` label to the
`kube-system` and components Namespace.

This allows NetworkPolicies to be applied using the `namespaceSelector`.

Signed-off-by: Imran Pochi <imran@kinvolk.io>

cli/cmd/cluster-apply.go

@@ -84,6 +84,12 @@ func runClusterApply(cmd *cobra.Command, args []string) {
 		ctxLogger.Fatalf("Verify cluster: %v", err)
 	}
 
+	labels := map[string]string{
+		"lokomotive.kinvolk.io/name": "kube-system",
+	}
+
+	k8sutil.UpdateNamespaceWithLabels(labels, "kube-system", kubeconfigPath)
+
 	// Do controlplane upgrades only if cluster already exists and it is not a managed platform.
 	if exists && !p.Meta().Managed {
 		fmt.Printf("\nEnsuring that cluster controlplane is up to date.\n")

pkg/components/util/install.go

@@ -44,6 +44,9 @@ func ensureNamespaceExists(name string, kubeconfigPath string) error {
 	_, err = cs.CoreV1().Namespaces().Create(context.TODO(), &v1.Namespace{
 		ObjectMeta: metav1.ObjectMeta{
 			Name: name,
+			Labels: map[string]string{
+				"lokomotive.kinvolk.io/name": name,
+			},
 		},
 	}, metav1.CreateOptions{})
 	if err != nil && !errors.IsAlreadyExists(err) {
@@ -62,6 +65,14 @@ func InstallComponent(c components.Component, kubeconfig string) error {
 		return fmt.Errorf("failed ensuring that namespace %q for component %q exists: %w", ns, name, err)
 	}
 
+	labels := map[string]string{
+		"lokomotive.kinvolk.io/name": ns,
+	}
+
+	if err := k8sutil.UpdateNamespaceWithLabels(labels, ns, kubeconfig); err != nil {
+		return fmt.Errorf("failed updating namespace %q with labels for component %q: %w", ns, name, err)
+	}
+
 	actionConfig, err := HelmActionConfig(ns, kubeconfig)
 	if err != nil {
 		return fmt.Errorf("failed preparing helm client: %w", err)