// should stop immediately.
func isClientConfigStillValid(kubeconfigPath string) (bool, error) {
	_, err := os.Stat(kubeconfigPath)
	if os.IsNotExist(err) {
		return false, nil
	}
	if err != nil {
		return false, fmt.Errorf("error reading existing bootstrap kubeconfig %s: %v", kubeconfigPath, err)
	}
	bootstrapClientConfig, err := loadRESTClientConfig(kubeconfigPath)
	if err != nil {

	if _, err := os.Stat(filepath); os.IsNotExist(err) {
		isControlPlaneNode = false
	}
	if len(nodeOptions.kubeConfigPath) == 0 {
		// Update the kubeconfig path depending on whether this is a control plane node or not.
		nodeOptions.kubeConfigPath = constants.GetKubeletKubeConfigPath()
		if isControlPlaneNode {
			nodeOptions.kubeConfigPath = constants.GetAdminKubeConfigPath()
		}
	}

	externalCfg := &v1beta4.UpgradeConfiguration{}

		SkipCRIDetect:     opts.skipCRIDetect,
	})
	if err != nil {
		return nil, err
	}

	client, err := cmdutil.GetClientSet(opts.kubeconfigPath, false)
	if err == nil {
		klog.V(1).Infof("[reset] Loaded client set from kubeconfig file: %s", opts.kubeconfigPath)
		initCfg, err = configutil.FetchInitConfigurationFromCluster(client, nil, "reset", false, false)
		if err != nil {

	if d.dryRun {
		return d.dryRunDir
	}
	return d.kubeconfigDir
}

// KubeConfigPath returns the path to the kubeconfig file to use for connecting to Kubernetes
func (d *initData) KubeConfigPath() string {
	if d.dryRun {
		d.kubeconfigPath = filepath.Join(d.dryRunDir, kubeadmconstants.AdminKubeConfigFileName)
	}
	return d.kubeconfigPath
}

	}

	tests := []struct {
		name                 string
		kubeconfigPath       string
		bootstrapPath        string
		certDir              string
		expectedCertConfig   *restclient.Config
		expectedClientConfig *restclient.Config
	}{
		{
			name:           "bootstrapPath is empty",
			kubeconfigPath: filevalid.Name(),
			bootstrapPath:  "",
			certDir:        dir,

}

func (c *hollowNodeConfig) createClientConfigFromFile() (*restclient.Config, error) {
	clientConfig, err := clientcmd.LoadFromFile(c.KubeconfigPath)
	if err != nil {
		return nil, fmt.Errorf("error while loading kubeconfig from file %v: %v", c.KubeconfigPath, err)
	}
	config, err := clientcmd.NewDefaultClientConfig(*clientConfig, &clientcmd.ConfigOverrides{}).ClientConfig()
	if err != nil {

		if r.Method != http.MethodHead {
			w.WriteHeader(http.StatusMethodNotAllowed)
		}
	}))
	defer ts.Close()

	kubeconfigPath := filepath.Join(t.TempDir(), "custom.conf")
	if err := os.WriteFile(kubeconfigPath, []byte(fmt.Sprintf(testKubeconfigDataFormat, ts.URL)), 0o600); err != nil {
		t.Fatalf("os.WriteFile returned unexpected error: %v", err)
	}

type expirationFlags struct {
	cfgPath        string
	kubeconfigPath string
	cfg            kubeadmapiv1.ClusterConfiguration
}

func addExpirationFlags(cmd *cobra.Command, flags *expirationFlags) {
	options.AddConfigFlag(cmd.Flags(), &flags.cfgPath)
	options.AddCertificateDirFlag(cmd.Flags(), &flags.cfg.CertificatesDir)
	options.AddKubeConfigFlag(cmd.Flags(), &flags.kubeconfigPath)
}

		return errors.Errorf("%s: spec was nil", errInvalid)
	}
	kubeConfigPath := filepath.Join(kubeConfigDir, name)
	if _, err := os.Stat(kubeConfigPath); err == nil {
		return errors.Errorf("%s: kube config: %s", errExist, kubeConfigPath)
	} else if !os.IsNotExist(err) {
		return errors.Wrapf(err, "unexpected error while checking if file exists: %s", kubeConfigPath)
	}
	if pkiutil.CSROrKeyExist(kubeConfigDir, name) {

		* The Kubernetes control plane instances scaled up.
		{{.etcdMessage}}

		To start administering your cluster from this node, you need to run the following as a regular user:

			mkdir -p $HOME/.kube
			sudo cp -i {{.KubeConfigPath}} $HOME/.kube/config
			sudo chown $(id -u):$(id -g) $HOME/.kube/config

		Run 'kubectl get nodes' to see this node join the cluster.

		`)))

	joinLongDescription = dedent.Dedent(`