Validation, defaulting and pre-create/update strategy for

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1/defaults.go

@@ -19,12 +19,9 @@ package v1beta1
 import (
 	"strings"
 
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
-var swaggerMetadataDescriptions = metav1.ObjectMeta{}.SwaggerDoc()
-
 func addDefaultingFuncs(scheme *runtime.Scheme) error {
 	scheme.AddTypeDefaultingFunc(&CustomResourceDefinition{}, func(obj interface{}) { SetDefaults_CustomResourceDefinition(obj.(*CustomResourceDefinition)) })
 	// TODO figure out why I can't seem to get my defaulter generated
@@ -66,14 +63,19 @@ func SetDefaults_CustomResourceDefinitionSpec(obj *CustomResourceDefinitionSpec)
 	if len(obj.Version) == 0 && len(obj.Versions) != 0 {
 		obj.Version = obj.Versions[0].Name
 	}
-	if len(obj.AdditionalPrinterColumns) == 0 {
-		obj.AdditionalPrinterColumns = []CustomResourceColumnDefinition{
-			{Name: "Age", Type: "date", Description: swaggerMetadataDescriptions["creationTimestamp"], JSONPath: ".metadata.creationTimestamp"},
-		}
-	}
 	if obj.Conversion == nil {
 		obj.Conversion = &CustomResourceConversion{
 			Strategy: NoneConverter,
 		}
 	}
 }
+
+// hasPerVersionColumns returns true if a CRD uses per-version columns.
+func hasPerVersionColumns(versions []CustomResourceDefinitionVersion) bool {
+	for _, v := range versions {
+		if len(v.AdditionalPrinterColumns) > 0 {
+			return true
+		}
+	}
+	return false
+}

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation.go

@@ -18,15 +18,16 @@ package validation
 
 import (
 	"fmt"
-	"k8s.io/apiserver/pkg/util/webhook"
 	"reflect"
 	"strings"
 
+	apiequality "k8s.io/apimachinery/pkg/api/equality"
 	genericvalidation "k8s.io/apimachinery/pkg/api/validation"
 	"k8s.io/apimachinery/pkg/util/sets"
 	validationutil "k8s.io/apimachinery/pkg/util/validation"
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
+	"k8s.io/apiserver/pkg/util/webhook"
 
 	"k8s.io/apiextensions-apiserver/pkg/apis/apiextensions"
 	apiservervalidation "k8s.io/apiextensions-apiserver/pkg/apiserver/validation"
@@ -99,6 +100,17 @@ func ValidateUpdateCustomResourceDefinitionStatus(obj, oldObj *apiextensions.Cus
 	return allErrs
 }
 
+// ValidateCustomResourceDefinitionVersion statically validates.
+func ValidateCustomResourceDefinitionVersion(version *apiextensions.CustomResourceDefinitionVersion, fldPath *field.Path, statusEnabled bool) field.ErrorList {
+	allErrs := field.ErrorList{}
+	allErrs = append(allErrs, ValidateCustomResourceDefinitionValidation(version.Schema, statusEnabled, fldPath.Child("schema"))...)
+	allErrs = append(allErrs, ValidateCustomResourceDefinitionSubresources(version.Subresources, fldPath.Child("subresources"))...)
+	for i := range version.AdditionalPrinterColumns {
+		allErrs = append(allErrs, ValidateCustomResourceColumnDefinition(&version.AdditionalPrinterColumns[i], fldPath.Child("additionalPrinterColumns").Index(i))...)
+	}
+	return allErrs
+}
+
 // ValidateCustomResourceDefinitionSpec statically validates
 func ValidateCustomResourceDefinitionSpec(spec *apiextensions.CustomResourceDefinitionSpec, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
@@ -128,7 +140,32 @@ func ValidateCustomResourceDefinitionSpec(spec *apiextensions.CustomResourceDefi
 		if errs := validationutil.IsDNS1035Label(version.Name); len(errs) > 0 {
 			allErrs = append(allErrs, field.Invalid(fldPath.Child("versions").Index(i).Child("name"), spec.Versions[i].Name, strings.Join(errs, ",")))
 		}
+		subresources := getSubresourcesForVersion(spec, version.Name)
+		allErrs = append(allErrs, ValidateCustomResourceDefinitionVersion(&version, fldPath.Child("versions").Index(i), hasStatusEnabled(subresources))...)
+	}
+
+	// The top-level and per-version fields are mutual exclusive
+	if spec.Validation != nil && hasPerVersionSchema(spec.Versions) {
+		allErrs = append(allErrs, field.Forbidden(fldPath.Child("validation"), "top-level and per-version schemas are mutually exclusive"))
 	}
+	if spec.Subresources != nil && hasPerVersionSubresources(spec.Versions) {
+		allErrs = append(allErrs, field.Forbidden(fldPath.Child("subresources"), "top-level and per-version subresources are mutually exclusive"))
+	}
+	if len(spec.AdditionalPrinterColumns) > 0 && hasPerVersionColumns(spec.Versions) {
+		allErrs = append(allErrs, field.Forbidden(fldPath.Child("additionalPrinterColumns"), "top-level and per-version additionalPrinterColumns are mutually exclusive"))
+	}
+
+	// Per-version fields may not all be set to identical values (top-level field should be used instead)
+	if hasIdenticalPerVersionSchema(spec.Versions) {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("versions"), spec.Versions, "per-version schemas may not all be set to identical values (top-level validation should be used instead)"))
+	}
+	if hasIdenticalPerVersionSubresources(spec.Versions) {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("versions"), spec.Versions, "per-version subresources may not all be set to identical values (top-level subresources should be used instead)"))
+	}
+	if hasIdenticalPerVersionColumns(spec.Versions) {
+		allErrs = append(allErrs, field.Invalid(fldPath.Child("versions"), spec.Versions, "per-version additionalPrinterColumns may not all be set to identical values (top-level additionalPrinterColumns should be used instead)"))
+	}
+
 	if !uniqueNames {
 		allErrs = append(allErrs, field.Invalid(fldPath.Child("versions"), spec.Versions, "must contain unique version names"))
 	}
@@ -161,11 +198,7 @@ func ValidateCustomResourceDefinitionSpec(spec *apiextensions.CustomResourceDefi
 	allErrs = append(allErrs, ValidateCustomResourceDefinitionNames(&spec.Names, fldPath.Child("names"))...)
 
 	if utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceValidation) {
-		statusEnabled := false
-		if spec.Subresources != nil && spec.Subresources.Status != nil {
-			statusEnabled = true
-		}
-		allErrs = append(allErrs, ValidateCustomResourceDefinitionValidation(spec.Validation, statusEnabled, fldPath.Child("validation"))...)
+		allErrs = append(allErrs, ValidateCustomResourceDefinitionValidation(spec.Validation, hasAnyStatusEnabled(spec), fldPath.Child("validation"))...)
 	} else if spec.Validation != nil {
 		allErrs = append(allErrs, field.Forbidden(fldPath.Child("validation"), "disabled by feature-gate CustomResourceValidation"))
 	}
@@ -177,7 +210,7 @@ func ValidateCustomResourceDefinitionSpec(spec *apiextensions.CustomResourceDefi
 	}
 
 	for i := range spec.AdditionalPrinterColumns {
-		if errs := ValidateCustomResourceColumnDefinition(&spec.AdditionalPrinterColumns[i], fldPath.Child("columns").Index(i)); len(errs) > 0 {
+		if errs := ValidateCustomResourceColumnDefinition(&spec.AdditionalPrinterColumns[i], fldPath.Child("additionalPrinterColumns").Index(i)); len(errs) > 0 {
 			allErrs = append(allErrs, errs...)
 		}
 	}
@@ -250,6 +283,118 @@ func ValidateCustomResourceDefinitionSpecUpdate(spec, oldSpec *apiextensions.Cus
 	return allErrs
 }
 
+// getSubresourcesForVersion returns the subresources for given version in given CRD spec.
+// NOTE That this function assumes version always exist since it's used by the validation process
+// that iterates through the existing versions.
+func getSubresourcesForVersion(crd *apiextensions.CustomResourceDefinitionSpec, version string) *apiextensions.CustomResourceSubresources {
+	if !hasPerVersionSubresources(crd.Versions) {
+		return crd.Subresources
+	}
+	for _, v := range crd.Versions {
+		if version == v.Name {
+			return v.Subresources
+		}
+	}
+	return nil
+}
+
+// hasAnyStatusEnabled returns true if given CRD spec has at least one Status Subresource set
+// among the top-level and per-version Subresources.
+func hasAnyStatusEnabled(crd *apiextensions.CustomResourceDefinitionSpec) bool {
+	if hasStatusEnabled(crd.Subresources) {
+		return true
+	}
+	for _, v := range crd.Versions {
+		if hasStatusEnabled(v.Subresources) {
+			return true
+		}
+	}
+	return false
+}
+
+// hasStatusEnabled returns true if given CRD Subresources has non-nil Status set.
+func hasStatusEnabled(subresources *apiextensions.CustomResourceSubresources) bool {
+	if subresources != nil && subresources.Status != nil {
+		return true
+	}
+	return false
+}
+
+// hasPerVersionSchema returns true if a CRD uses per-version schema.
+func hasPerVersionSchema(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	for _, v := range versions {
+		if v.Schema != nil {
+			return true
+		}
+	}
+	return false
+}
+
+// hasPerVersionSubresources returns true if a CRD uses per-version subresources.
+func hasPerVersionSubresources(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	for _, v := range versions {
+		if v.Subresources != nil {
+			return true
+		}
+	}
+	return false
+}
+
+// hasPerVersionColumns returns true if a CRD uses per-version columns.
+func hasPerVersionColumns(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	for _, v := range versions {
+		if len(v.AdditionalPrinterColumns) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
+// hasIdenticalPerVersionSchema returns true if a CRD sets identical non-nil values
+// to all per-version schemas
+func hasIdenticalPerVersionSchema(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	if len(versions) == 0 {
+		return false
+	}
+	value := versions[0].Schema
+	for _, v := range versions {
+		if v.Schema == nil || !apiequality.Semantic.DeepEqual(v.Schema, value) {
+			return false
+		}
+	}
+	return true
+}
+
+// hasIdenticalPerVersionSubresources returns true if a CRD sets identical non-nil values
+// to all per-version subresources
+func hasIdenticalPerVersionSubresources(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	if len(versions) == 0 {
+		return false
+	}
+	value := versions[0].Subresources
+	for _, v := range versions {
+		if v.Subresources == nil || !apiequality.Semantic.DeepEqual(v.Subresources, value) {
+			return false
+		}
+	}
+	return true
+}
+
+// hasIdenticalPerVersionColumns returns true if a CRD sets identical non-nil values
+// to all per-version columns
+func hasIdenticalPerVersionColumns(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	if len(versions) == 0 {
+		return false
+	}
+	value := versions[0].AdditionalPrinterColumns
+	for _, v := range versions {
+		if len(v.AdditionalPrinterColumns) == 0 || !apiequality.Semantic.DeepEqual(v.AdditionalPrinterColumns, value) {
+			return false
+		}
+	}
+	return true
+}
+
 // ValidateCustomResourceDefinitionStatus statically validates
 func ValidateCustomResourceDefinitionStatus(status *apiextensions.CustomResourceDefinitionStatus, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/validation/validation_test.go

@@ -594,6 +594,55 @@ func TestValidateCustomResourceDefinition(t *testing.T) {
 			},
 			errors: []validationMatch{},
 		},
+		{
+			name: "per-version fields may not all be set to identical values (top-level field should be used instead)",
+			resource: &apiextensions.CustomResourceDefinition{
+				ObjectMeta: metav1.ObjectMeta{Name: "plural.group.com"},
+				Spec: apiextensions.CustomResourceDefinitionSpec{
+					Group:   "group.com",
+					Version: "version",
+					Versions: []apiextensions.CustomResourceDefinitionVersion{
+						{
+							Name:    "version",
+							Served:  true,
+							Storage: true,
+							Schema: &apiextensions.CustomResourceValidation{
+								OpenAPIV3Schema: validValidationSchema,
+							},
+							Subresources:             &apiextensions.CustomResourceSubresources{},
+							AdditionalPrinterColumns: []apiextensions.CustomResourceColumnDefinition{{Name: "Alpha", Type: "string", JSONPath: ".spec.alpha"}},
+						},
+						{
+							Name:    "version2",
+							Served:  true,
+							Storage: false,
+							Schema: &apiextensions.CustomResourceValidation{
+								OpenAPIV3Schema: validValidationSchema,
+							},
+							Subresources:             &apiextensions.CustomResourceSubresources{},
+							AdditionalPrinterColumns: []apiextensions.CustomResourceColumnDefinition{{Name: "Alpha", Type: "string", JSONPath: ".spec.alpha"}},
+						},
+					},
+					Scope: apiextensions.NamespaceScoped,
+					Names: apiextensions.CustomResourceDefinitionNames{
+						Plural:   "plural",
+						Singular: "singular",
+						Kind:     "Plural",
+						ListKind: "PluralList",
+					},
+				},
+				Status: apiextensions.CustomResourceDefinitionStatus{
+					StoredVersions: []string{"version"},
+				},
+			},
+			errors: []validationMatch{
+				// Per-version schema/subresources/columns may not all be set to identical values.
+				// Note that the test will fail if we de-duplicate the expected errors below.
+				invalid("spec", "versions"),
+				invalid("spec", "versions"),
+				invalid("spec", "versions"),
+			},
+		},
 	}
 
 	for _, tc := range tests {
@@ -1003,6 +1052,87 @@ func TestValidateCustomResourceDefinitionUpdate(t *testing.T) {
 				immutable("spec", "names", "plural"),
 			},
 		},
+		{
+			name: "top-level and per-version fields are mutually exclusive",
+			old: &apiextensions.CustomResourceDefinition{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "plural.group.com",
+					ResourceVersion: "42",
+				},
+				Spec: apiextensions.CustomResourceDefinitionSpec{
+					Group:   "group.com",
+					Version: "version",
+					Versions: []apiextensions.CustomResourceDefinitionVersion{
+						{
+							Name:         "version",
+							Served:       true,
+							Storage:      true,
+							Subresources: &apiextensions.CustomResourceSubresources{},
+						},
+						{
+							Name:    "version2",
+							Served:  true,
+							Storage: false,
+						},
+					},
+					Scope: apiextensions.NamespaceScoped,
+					Names: apiextensions.CustomResourceDefinitionNames{
+						Plural:   "plural",
+						Singular: "singular",
+						Kind:     "Plural",
+						ListKind: "PluralList",
+					},
+				},
+				Status: apiextensions.CustomResourceDefinitionStatus{
+					StoredVersions: []string{"version"},
+				},
+			},
+			resource: &apiextensions.CustomResourceDefinition{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:            "plural.group.com",
+					ResourceVersion: "42",
+				},
+				Spec: apiextensions.CustomResourceDefinitionSpec{
+					Group:   "group.com",
+					Version: "version",
+					Versions: []apiextensions.CustomResourceDefinitionVersion{
+						{
+							Name:    "version",
+							Served:  true,
+							Storage: true,
+						},
+						{
+							Name:    "version2",
+							Served:  true,
+							Storage: false,
+							Schema: &apiextensions.CustomResourceValidation{
+								OpenAPIV3Schema: validValidationSchema,
+							},
+							Subresources:             &apiextensions.CustomResourceSubresources{},
+							AdditionalPrinterColumns: []apiextensions.CustomResourceColumnDefinition{{Name: "Alpha", Type: "string", JSONPath: ".spec.alpha"}},
+						},
+					},
+					Validation: &apiextensions.CustomResourceValidation{
+						OpenAPIV3Schema: validValidationSchema,
+					},
+					Subresources: &apiextensions.CustomResourceSubresources{},
+					Scope:        apiextensions.NamespaceScoped,
+					Names: apiextensions.CustomResourceDefinitionNames{
+						Plural:   "plural",
+						Singular: "singular",
+						Kind:     "Plural",
+						ListKind: "PluralList",
+					},
+				},
+				Status: apiextensions.CustomResourceDefinitionStatus{
+					StoredVersions: []string{"version"},
+				},
+			},
+			errors: []validationMatch{
+				forbidden("spec", "validation"),
+				forbidden("spec", "subresources"),
+			},
+		},
 	}
 
 	for _, tc := range tests {
@@ -1090,36 +1220,7 @@ func TestValidateCustomResourceDefinitionValidation(t *testing.T) {
 		{
 			name: "all allowed fields at the root of the schema with status",
 			input: apiextensions.CustomResourceValidation{
-				OpenAPIV3Schema: &apiextensions.JSONSchemaProps{
-					Description:      "This is a description",
-					Type:             "object",
-					Format:           "date-time",
-					Title:            "This is a title",
-					Maximum:          float64Ptr(10),
-					ExclusiveMaximum: true,
-					Minimum:          float64Ptr(5),
-					ExclusiveMinimum: true,
-					MaxLength:        int64Ptr(10),
-					MinLength:        int64Ptr(5),
-					Pattern:          "^[a-z]$",
-					MaxItems:         int64Ptr(10),
-					MinItems:         int64Ptr(5),
-					MultipleOf:       float64Ptr(3),
-					Required:         []string{"spec", "status"},
-					Items: &apiextensions.JSONSchemaPropsOrArray{
-						Schema: &apiextensions.JSONSchemaProps{
-							Description: "This is a schema nested under Items",
-						},
-					},
-					Properties: map[string]apiextensions.JSONSchemaProps{
-						"spec":   {},
-						"status": {},
-					},
-					ExternalDocs: &apiextensions.ExternalDocumentation{
-						Description: "This is an external documentation description",
-					},
-					Example: &example,
-				},
+				OpenAPIV3Schema: validValidationSchema,
 			},
 			statusEnabled: true,
 			wantError:     false,
@@ -1139,6 +1240,37 @@ func TestValidateCustomResourceDefinitionValidation(t *testing.T) {
 
 var example = apiextensions.JSON(`"This is an example"`)
 
+var validValidationSchema = &apiextensions.JSONSchemaProps{
+	Description:      "This is a description",
+	Type:             "object",
+	Format:           "date-time",
+	Title:            "This is a title",
+	Maximum:          float64Ptr(10),
+	ExclusiveMaximum: true,
+	Minimum:          float64Ptr(5),
+	ExclusiveMinimum: true,
+	MaxLength:        int64Ptr(10),
+	MinLength:        int64Ptr(5),
+	Pattern:          "^[a-z]$",
+	MaxItems:         int64Ptr(10),
+	MinItems:         int64Ptr(5),
+	MultipleOf:       float64Ptr(3),
+	Required:         []string{"spec", "status"},
+	Items: &apiextensions.JSONSchemaPropsOrArray{
+		Schema: &apiextensions.JSONSchemaProps{
+			Description: "This is a schema nested under Items",
+		},
+	},
+	Properties: map[string]apiextensions.JSONSchemaProps{
+		"spec":   {},
+		"status": {},
+	},
+	ExternalDocs: &apiextensions.ExternalDocumentation{
+		Description: "This is an external documentation description",
+	},
+	Example: &example,
+}
+
 func float64Ptr(f float64) *float64 {
 	return &f
 }

staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresourcedefinition/strategy.go

@@ -57,9 +57,25 @@ func (strategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
 	// if the feature gate is disabled, drop the feature.
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceValidation) {
 		crd.Spec.Validation = nil
+		for i := range crd.Spec.Versions {
+			crd.Spec.Versions[i].Schema = nil
+		}
 	}
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceSubresources) {
 		crd.Spec.Subresources = nil
+		for i := range crd.Spec.Versions {
+			crd.Spec.Versions[i].Subresources = nil
+		}
+	}
+	// On CREATE, if the CustomResourceWebhookConversion feature gate is off, we auto-clear
+	// the per-version fields. This is to be consistent with the other built-in types, as the
+	// apiserver drops unknown fields.
+	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceWebhookConversion) {
+		for i := range crd.Spec.Versions {
+			crd.Spec.Versions[i].Schema = nil
+			crd.Spec.Versions[i].Subresources = nil
+			crd.Spec.Versions[i].AdditionalPrinterColumns = nil
+		}
 	}
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceWebhookConversion) && crd.Spec.Conversion != nil {
 		crd.Spec.Conversion.WebhookClientConfig = nil
@@ -96,10 +112,36 @@ func (strategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceValidation) {
 		newCRD.Spec.Validation = nil
 		oldCRD.Spec.Validation = nil
+		for i := range newCRD.Spec.Versions {
+			newCRD.Spec.Versions[i].Schema = nil
+		}
+		for i := range oldCRD.Spec.Versions {
+			oldCRD.Spec.Versions[i].Schema = nil
+		}
 	}
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceSubresources) {
 		newCRD.Spec.Subresources = nil
 		oldCRD.Spec.Subresources = nil
+		for i := range newCRD.Spec.Versions {
+			newCRD.Spec.Versions[i].Subresources = nil
+		}
+		for i := range oldCRD.Spec.Versions {
+			oldCRD.Spec.Versions[i].Subresources = nil
+		}
+	}
+
+	// On UPDATE, if the CustomResourceWebhookConversion feature gate is off, we auto-clear
+	// the per-version fields if the old CRD doesn't use per-version fields already.
+	// This is to be consistent with the other built-in types, as the apiserver drops unknown
+	// fields. If the old CRD already uses per-version fields, the CRD is allowed to continue
+	// use per-version fields.
+	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceWebhookConversion) &&
+		!hasPerVersionField(oldCRD.Spec.Versions) {
+		for i := range newCRD.Spec.Versions {
+			newCRD.Spec.Versions[i].Schema = nil
+			newCRD.Spec.Versions[i].Subresources = nil
+			newCRD.Spec.Versions[i].AdditionalPrinterColumns = nil
+		}
 	}
 	if !utilfeature.DefaultFeatureGate.Enabled(apiextensionsfeatures.CustomResourceWebhookConversion) && newCRD.Spec.Conversion != nil {
 		if oldCRD.Spec.Conversion == nil || newCRD.Spec.Conversion.WebhookClientConfig == nil {
@@ -117,6 +159,16 @@ func (strategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
 	}
 }
 
+// hasPerVersionField returns true if a CRD uses per-version schema/subresources/columns fields.
+func hasPerVersionField(versions []apiextensions.CustomResourceDefinitionVersion) bool {
+	for _, v := range versions {
+		if v.Schema != nil || v.Subresources != nil || len(v.AdditionalPrinterColumns) > 0 {
+			return true
+		}
+	}
+	return false
+}
+
 // Validate validates a new CustomResourceDefinition.
 func (strategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
 	return validation.ValidateCustomResourceDefinition(obj.(*apiextensions.CustomResourceDefinition))