if _, err := kubeClient.Kube().CoreV1().Namespaces().Update(context.Background(), nsObj, metav1.UpdateOptions{}); err != nil {
		return fmt.Errorf("failed to update namespace %s: %v", ns, err)
	}
	return nil
}

func namespaceIsLabeledAmbient(kubeClient kube.CLIClient, ns string) (bool, error) {
	nsObj, err := kubeClient.Kube().CoreV1().Namespaces().Get(context.Background(), ns, metav1.GetOptions{})
	if errors.IsNotFound(err) {

	"istio.io/istio/pkg/test/util/assert"
)

func TestExistingPodAddedWhenNsLabeled(t *testing.T) {
	setupLogging()
	NodeName = "testnode"
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	pod := &corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "test",
			Namespace: "test",
		},
		Spec: corev1.PodSpec{
			NodeName: NodeName,
		},

			UID:       "123",
		},
		Spec: corev1.PodSpec{
			Containers: containers,
		},
		Status: podStatus,
	}
}

func TestServerAddPod(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	setupLogging()
	fixture := getTestFixure(ctx)
	netServer := fixture.netServer
	ztunnelServer := fixture.ztunnelServer
	podMeta := metav1.ObjectMeta{
		Name:      "foo",

	// Ignore the err because we don't want to show
	// "no running Istio pods in istio-system" for the first time
	_ = detectIstioVersionDiff(p, tag, ns, kubeClient, iop)
	exists := revtag.PreviousInstallExists(context.Background(), kubeClient.Kube())
	err = detectDefaultWebhookChange(p, kubeClient, iop, exists)
	if err != nil {
		return fmt.Errorf("failed to detect the default webhook change: %v", err)
	}

	isZtunnel := strings.HasPrefix(podName, "ztunnel")
	if client == nil {
		return isZtunnel
	}
	pod, err := client.Kube().CoreV1().Pods(podNamespace).Get(context.Background(), podName, metav1.GetOptions{})
	if err != nil {
		return isZtunnel
	}
	if v, ok := pod.Labels["app"]; ok {
		return v == "ztunnel"
	}
	return isZtunnel
}

}

func AnnotateEnrolledPod(client kubernetes.Interface, pod *metav1.ObjectMeta) error {
	_, err := client.CoreV1().
		Pods(pod.Namespace).
		Patch(
			context.Background(),
			pod.Name,
			types.MergePatchType,
			annotationPatch,
			metav1.PatchOptions{},
			// Both "pods" and "pods/status" can mutate the metadata. However, pods/status is lower privilege, so we use that instead.

# Ztunnel

This document provides an overview of the architecture and design decisions around Ztunnel, the node-proxy component in ambient mode.

## Background and motivation

Motivations to implement ztunnel generally came from two areas.

First, and most importantly, it serves as a means to implement the real goal: waypoints.

func isAmbientPod(client kubernetes.Interface, podName, podNamespace string) (bool, error) {
	pod, err := client.CoreV1().Pods(podNamespace).Get(context.Background(), podName, metav1.GetOptions{})
	if err != nil {
		return false, err
	}
	ns, err := client.CoreV1().Namespaces().Get(context.Background(), podNamespace, metav1.GetOptions{})
	if err != nil {
		return false, err
	}

	return util.PodRedirectionEnabled(ns, pod), nil

		PodName:      "pod-bingo",
		PodNamespace: "funkyns",
		IPs: []IPConfig{{
			Address: *addr,
		}},
	}

	setupLogging()
	NodeName = "testnode"
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	pod := &corev1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Name:      "pod-bingo",
			Namespace: "funkyns",
		},
		Spec: corev1.PodSpec{
			NodeName: NodeName,
		},

		return f(configWriter)
	}
}

func PodOnNodeFromDaemonset(node string, name, namespace string, client kube.Client) (types.NamespacedName, error) {
	ds, err := client.Kube().AppsV1().DaemonSets(namespace).Get(context.Background(), name, metav1.GetOptions{})
	if err != nil {
		return types.NamespacedName{}, err
	}
	selector := ds.Spec.Selector
	if selector == nil {
		return types.NamespacedName{}, fmt.Errorf("selector is required")