return nil
	}
	mwhs, err := client.Kube().AdmissionregistrationV1().MutatingWebhookConfigurations().List(context.Background(), metav1.ListOptions{
		LabelSelector: "app=sidecar-injector,istio.io/rev=default,istio.io/tag=default",
	})
	if err != nil {
		return err
	}
	// If there is no default webhook but a revisioned default webhook exists,

			fmt.Fprintf(writer, "   WARNING: User ID (UID) 1337 is reserved for the sidecar proxy.\n")
		}
	}

	// https://istio.io/docs/setup/kubernetes/additional-setup/requirements/
	// says "We recommend adding an explicit app label and version label to deployments."
	if !labels.HasCanonicalServiceName(pod.Labels) {
		fmt.Fprintf(writer, "Suggestion: add required service name label for Istio telemetry. "+
			"See %s.\n", url.DeploymentRequirements)

	// Register all commands.
	registerCommand(serverCmd)

	// Set up app.
	cli.HelpFlag = cli.BoolFlag{
		Name:  "help, h",
		Usage: "show help",
	}
	cli.VersionPrinter = printMinIOVersion

	app := cli.NewApp()
	app.Name = name
	app.Author = "MinIO, Inc."
	app.Version = ReleaseTag
	app.Usage = "High Performance Object Storage"

			WantException:  true,
		},
		{ // case 9
			Args:           strings.Split("prometheus --browser=false", " "),
			ExpectedOutput: "Error: no pods found with selector app.kubernetes.io/name=prometheus\n",
			WantException:  true,
		},
		{ // case 10
			Args:           strings.Split("zipkin --browser=false", " "),
			ExpectedOutput: "Error: no pods found with selector app=zipkin\n",

				&corev1.Service{
					ObjectMeta: metav1.ObjectMeta{
						Name:      "productpage",
						Namespace: "default",
					},
					Spec: corev1.ServiceSpec{
						Selector: map[string]string{
							"app": "productpage",
						},
						Ports: []corev1.ServicePort{
							{
								Name:       "http",
								Port:       9080,
								TargetPort: intstr.FromInt32(9080),
							},
						},
					},
				},

func PreviousInstallExists(ctx context.Context, client kubernetes.Interface) bool {
	mwhs, err := client.AdmissionregistrationV1().MutatingWebhookConfigurations().List(ctx, metav1.ListOptions{
		LabelSelector: "app=sidecar-injector",
	})
	if err != nil {
		return false
	}
	return len(mwhs.Items) > 0
}

					ObjectMeta: metav1.ObjectMeta{
						Name:      "istiod-test",
						Namespace: "istio-system",
						Labels: map[string]string{
							"app":                 "istiod",
							label.IoIstioRev.Name: c.revision,
						},
					},
					Status: corev1.PodStatus{
						Phase: corev1.PodRunning,
					},
				}, metav1.CreateOptions{})