printer.Fprintf(w, "\t%s\n", scanner.Text())
		}
	}
}

// runPreflightChecks runs the root preflight check
func runPreflightChecks(client clientset.Interface, ignorePreflightErrors sets.Set[string], printer output.Printer) error {
	printer.Printf("[preflight] Running pre-flight checks.\n")
	err := preflight.RunRootCheckOnly(ignorePreflightErrors)
	if err != nil {
		return err
	}

	// and validates JoinConfiguration
	if opt.externalcfg.NodeRegistration.Name == "" {
		klog.V(1).Infoln("[preflight] found NodeName empty; using OS hostname as NodeName")
	}

	if opt.externalcfg.ControlPlane != nil && opt.externalcfg.ControlPlane.LocalAPIEndpoint.AdvertiseAddress == "" {
		klog.V(1).Infoln("[preflight] found advertiseAddress empty; using default interface's IP address as advertiseAddress")
	}

type Error struct {
	Msg string
}

// Error implements the standard error interface
func (e *Error) Error() string {
	return fmt.Sprintf("[preflight] Some fatal errors occurred:\n%s%s", e.Msg, "[preflight] If you know what you are doing, you can make a check non-fatal with `--ignore-preflight-errors=...`")
}

// Preflight identifies this error as a preflight error

		if !expected.Equal(data.ignorePreflightErrors) {
			t.Errorf("Invalid ignore preflight errors. Expected: %v. Actual: %v", sets.List(expected), sets.List(data.ignorePreflightErrors))
		}
		if !expected.HasAll(data.cfg.NodeRegistration.IgnorePreflightErrors...) {
			t.Errorf("Invalid ignore preflight errors in JoinConfiguration. Expected: %v. Actual: %v", sets.List(expected), data.cfg.NodeRegistration.IgnorePreflightErrors)

		if !expected.Equal(data.ignorePreflightErrors) {
			t.Errorf("Invalid ignore preflight errors. Expected: %v. Actual: %v", sets.List(expected), sets.List(data.ignorePreflightErrors))
		}
		if !expected.HasAll(data.cfg.NodeRegistration.IgnorePreflightErrors...) {
			t.Errorf("Invalid ignore preflight errors in InitConfiguration. Expected: %v. Actual: %v", sets.List(expected), data.cfg.NodeRegistration.IgnorePreflightErrors)

						opts.Check = check.Status(http.StatusUnauthorized)
					},
				},
				{
					name: "expired-token-cors-preflight-request-allowed",
					customizeCall: func(t framework.TestContext, from echo.Instance, opts *echo.CallOptions) {
						opts.HTTP.Path = "/expired-token-cors-preflight-request-allowed"
						opts.HTTP.Method = "OPTIONS"
						opts.HTTP.Headers = headers.New().
							WithAuthz(jwt.TokenExpired).

	cmdutil "k8s.io/kubernetes/cmd/kubeadm/app/cmd/util"
	"k8s.io/kubernetes/cmd/kubeadm/app/features"
	"k8s.io/kubernetes/cmd/kubeadm/app/phases/upgrade"
	"k8s.io/kubernetes/cmd/kubeadm/app/preflight"
	kubeadmutil "k8s.io/kubernetes/cmd/kubeadm/app/util"
	"k8s.io/kubernetes/cmd/kubeadm/app/util/apiclient"
	configutil "k8s.io/kubernetes/cmd/kubeadm/app/util/config"
	"k8s.io/kubernetes/cmd/kubeadm/app/util/output"
)

		if err := migrateCoreDNSCorefile(client, coreDNSConfigMap, corefile, currentInstalledCoreDNSVersion); err != nil {
			// Errors in Corefile Migration is verified during preflight checks. This part will be executed when a user has chosen
			// to ignore preflight check errors.
			canMigrateCorefile = false
			klog.Warningf("the CoreDNS Configuration was not migrated: %v. The existing CoreDNS Corefile configuration has been retained.", err)

		{[]string{"--foo=bar"}, true},
		{[]string{"--config=hello"}, true},
		{[]string{"--config=hello", "--ignore-preflight-errors=all"}, true},
		// Expected to succeed, --config is mixed with skip-* flags only or no other flags
		{[]string{"--config=hello", "--skip-token-print=true"}, true},
		{[]string{"--config=hello", "--ignore-preflight-errors=baz", "--skip-token-print"}, true},
		// Expected to fail, --config is mixed with the --foo flag

	return d.client
}

// PatchesDir returns the folder where patches for components are stored
func (d *nodeData) PatchesDir() string {
	return d.patchesDir
}

// IgnorePreflightErrors returns the list of preflight errors to ignore.
func (d *nodeData) IgnorePreflightErrors() sets.Set[string] {
	return d.ignorePreflightErrors
}

// KubeConfigPath returns the path to the user kubeconfig file.