func installCNIOrFail(t framework.TestContext, ver string) {
	cniFilePath := filepath.Join(env.IstioSrc, CNIConfigDir,
		fmt.Sprintf("%s-cni-install.yaml.tar", ver))
	config, err := file.ReadTarFile(cniFilePath)
	if err != nil {
		t.Fatalf("Failed to read CNI manifest %v", err)
	}
	config = strings.ReplaceAll(config, "kube-system", i.Settings().SystemNamespace)
	t.ConfigIstio().YAML("", config).ApplyOrFail(t)

// provided istio version must be present in tests/integration/pilot/testdata/upgrade for the installation to succeed
func installRevisionOrFail(t framework.TestContext, version string, configs map[string]string) {
	config, err := file.ReadTarFile(filepath.Join(env.IstioSrc, "tests/integration/pilot/testdata/upgrade",
		fmt.Sprintf("%s-install.yaml.tar", version)))
	if err != nil {
		t.Fatalf("could not read installation config: %v", err)
	}