func NewGenericWebhook(scheme *runtime.Scheme, codecFactory serializer.CodecFactory, config *rest.Config, groupVersions []schema.GroupVersion, retryBackoff wait.Backoff) (*GenericWebhook, error) {
	for _, groupVersion := range groupVersions {
		if !scheme.IsVersionRegistered(groupVersion) {
			return nil, fmt.Errorf("webhook plugin requires enabling extension resource: %s", groupVersion)
		}
	}

	clientConfig := rest.CopyConfig(config)

	if len(l) == 0 {
		l = "<none>"
	}
	return l
}

func ExtractGroupVersions(l *APIGroupList) []string {
	var groupVersions []string
	for _, g := range l.Groups {
		for _, gv := range g.Versions {
			groupVersions = append(groupVersions, gv.GroupVersion)
		}
	}
	return groupVersions
}

// HasAnnotation returns a bool if passed in annotation exists
func HasAnnotation(obj ObjectMeta, ann string) bool {

	if len(testCodecMediaType) != 0 {
		serializerInfo, ok := runtime.SerializerInfoForMediaType(codecs.SupportedMediaTypes(), testCodecMediaType)
		if !ok {
			panic(fmt.Sprintf("no serializer for %s", testCodecMediaType))
		}
		return codecs.CodecForVersions(serializerInfo.Serializer, codecs.UniversalDeserializer(), schema.GroupVersions(gvs), nil)
	}

		if ! grep -q "${expected_install_package}/install" "${known_version_file}" ; then
			echo "missing ${expected_install_package}/install from ${known_version_file}"
			exit 1
		fi
	done
done

# check all groupversions to make sure they're in the init.sh file.  This isn't perfect, but its slightly
# better than nothing
for external_group_version in "${external_group_versions[@]}"; do

type fakeRoot struct {
	spec *spec3.OpenAPI
}

func (f *fakeRoot) GroupVersions() ([]schema.GroupVersion, error) {
	// Unused
	return nil, nil
}

// GVSpec returns hard-coded OpenAPI V3 document.
func (f *fakeRoot) GVSpec(gv schema.GroupVersion) (*spec3.OpenAPI, error) {
	return f.spec, nil
}

func (f *fakeRoot) GVSpecAsMap(gv schema.GroupVersion) (map[string]interface{}, error) {
	// Unused
	return nil, nil

		if err != nil {
			t.Fatalf("Cannot create converter: %v", err)
		}
		o := test.SourceObject.DeepCopyObject()
		toVersion, _ := schema.ParseGroupVersion(test.ToVersion)
		toVersions := schema.GroupVersions{toVersion}
		actual, err := safeConverter.ConvertToVersion(o, toVersions)
		if test.ExpectedFailure != "" {
			if err == nil || !strings.Contains(err.Error(), test.ExpectedFailure) {

	for _, version := range crd.Spec.Versions {
		c.queue.Add(schema.GroupVersion{Group: crd.Spec.Group, Version: version.Name})
	}
}

func (c *crdRegistrationController) handleVersionUpdate(groupVersion schema.GroupVersion) error {
	apiServiceName := groupVersion.Version + "." + groupVersion.Group

	// check all CRDs.  There shouldn't that many, but if we have problems later we can index them

	tests := []struct {
		input string
		out   GroupVersion
		err   func(error) bool
	}{
		{input: "v1", out: GroupVersion{Version: "v1"}},
		{input: "v2", out: GroupVersion{Version: "v2"}},
		{input: "/v1", out: GroupVersion{Version: "v1"}},
		{input: "v1/", out: GroupVersion{Group: "v1"}},
		{input: "/v1/", err: func(err error) bool { return err.Error() == "unexpected GroupVersion string: /v1/" }},

// This object should contain all parameterization necessary for running a particular API version
type APIGroupVersion struct {
	Storage map[string]rest.Storage

	Root string

	// GroupVersion is the external group version
	GroupVersion schema.GroupVersion

	// AllServedVersionsByResource is indexed by resource and maps to a list of versions that resource exists in.

        "groupVersion": "authentication.k8s.io/v1",
        "version": "v1"
      },
      "versions": [
        {
          "groupVersion": "authentication.k8s.io/v1",
          "version": "v1"
        },
        {
          "groupVersion": "authentication.k8s.io/v1beta1",
          "version": "v1beta1"
        },
        {
          "groupVersion": "authentication.k8s.io/v1alpha1",