ResolverConfig: nil,
			},
			isServiceActiveFunc: func(string) (bool, error) { return true, nil },
			expected: &kubeletconfig.KubeletConfiguration{
				ResolverConfig: ptr.To(kubeletSystemdResolverConfig),
			},
		},
		{
			name: "the resolver config should not be set when systemd-resolved is not active",
			cfg: &kubeletconfig.KubeletConfiguration{
				ResolverConfig: nil,
			},

			cfg: &kubeletconfig.KubeletConfiguration{
				ResolverConfig: &fooResolverConfig,
				StaticPodPath:  "/foo/staticpods",
				Authentication: kubeletconfig.KubeletAuthentication{
					X509: kubeletconfig.KubeletX509Authentication{
						ClientCAFile: "/foo/ca.crt",
					},
				},
			},
			expected: &kubeletconfig.KubeletConfiguration{
				ResolverConfig: ptr.To(""),

}

// mutateResolverConfig mutates the ResolverConfig in the kubeletConfig dynamically.
func mutateResolverConfig(cfg *kubeletconfig.KubeletConfiguration, isServiceActiveFunc func(string) (bool, error)) error {
	ok, err := isServiceActiveFunc("systemd-resolved")
	if err != nil {
		klog.Warningf("cannot determine if systemd-resolved is active: %v", err)
	}
	if ok {
		if cfg.ResolverConfig == nil {

}

func getHostDNSConfig(resolverConfig string) (*runtimeapi.DNSConfig, error) {
	if resolverConfig == "" {
		// This handles "" by returning defaults.
		return getDNSConfig(resolverConfig)
	}

	isFile, err := fileExists(resolverConfig)
	if err != nil {
		err = fmt.Errorf(`Unexpected error while getting os.Stat for "%s" resolver config. Error: %w`, resolverConfig, err)

	// conjunction with clusterDomain and clusterDNS.
	ResolverConfig string
}

// NewConfigurer returns a DNS configurer for launching pods.
func NewConfigurer(recorder record.EventRecorder, nodeRef *v1.ObjectReference, nodeIPs []net.IP, clusterDNS []net.IP, clusterDomain, resolverConfig string) *Configurer {
	return &Configurer{
		recorder:         recorder,
		getHostDNSConfig: getHostDNSConfig,

	paths = append(paths, &kc.StaticPodPath)
	paths = append(paths, &kc.Authentication.X509.ClientCAFile)
	paths = append(paths, &kc.TLSCertFile)
	paths = append(paths, &kc.TLSPrivateKeyFile)
	paths = append(paths, &kc.ResolverConfig)
	paths = append(paths, &kc.VolumePluginDir)
	paths = append(paths, &kc.PodLogsDir)
	return paths

	}

	// Mutate the fields we care about.
	klog.V(2).Infof("[componentconfig] kubelet/Windows: changing field \"resolverConfig\" to empty")
	cfg.ResolverConfig = ptr.To("")
	mutateStringField("staticPodPath", &cfg.StaticPodPath)
	mutateStringField("authentication.x509.clientCAFile", &cfg.Authentication.X509.ClientCAFile)

				continue
			}

			return p, server, nil
		}
	}
	return dnsmessage.Parser{}, "", lastErr
}

// A resolverConfig represents a DNS stub resolver configuration.
type resolverConfig struct {
	initOnce sync.Once // guards init of resolverConfig

	// ch is used as a semaphore that only allows one lookup at a
	// time to recheck resolv.conf.

limitations under the License.
*/

package dns

import (
	runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1"
)

var (
	defaultResolvConf = hostResolvConf
)

func fakeGetHostDNSConfigCustom(resolverConfig string) (*runtimeapi.DNSConfig, error) {
	return &runtimeapi.DNSConfig{
		Servers:  []string{testHostNameserver},
		Searches: []string{testHostDomain},
	}, nil

				HairpinMode:                               v1beta1.PromiscuousBridge,
				MaxPods:                                   110,
				PodPidsLimit:                              utilpointer.Int64(-1),
				ResolverConfig:                            utilpointer.String(kubetypes.ResolvConfDefault),
				CPUCFSQuota:                               utilpointer.Bool(true),