Only prevent validation of top-level metadata field

Signed-off-by: Arjun Naik <arjun.rn@gmail.com>

pkg/crd/gen.go

@@ -108,6 +108,7 @@ func (g Generator) Generate(ctx *genall.GenerationContext) error {
 		parser.NeedCRDFor(groupKind, g.MaxDescLen)
 		crdRaw := parser.CustomResourceDefinitions[groupKind]
 		addAttribution(&crdRaw)
+		fixupMetadata(crdRaw)
 
 		versionedCRDs := make([]interface{}, len(crdVersions))
 		for i, ver := range crdVersions {
@@ -156,6 +157,18 @@ func (g Generator) Generate(ctx *genall.GenerationContext) error {
 	return nil
 }
 
+// fixupMetadata resets the schema for the top-level metadata field which is need for CRD validation
+func fixupMetadata(crd apiext.CustomResourceDefinition) {
+	for _, v := range crd.Spec.Versions {
+		if v.Schema != nil && v.Schema.OpenAPIV3Schema != nil && v.Schema.OpenAPIV3Schema.Properties != nil {
+			schemaProperties := v.Schema.OpenAPIV3Schema.Properties
+			if _, ok := schemaProperties["metadata"]; ok {
+				schemaProperties["metadata"] = apiext.JSONSchemaProps{Type: "object"}
+			}
+		}
+	}
+}
+
 // toTrivialVersions strips out all schemata except for the storage schema,
 // and moves that up into the root object.  This makes the CRD compatible
 // with pre 1.13 clusters.

pkg/crd/known_types.go

@@ -26,11 +26,6 @@ import (
 var KnownPackages = map[string]PackageOverride{
 
 	"k8s.io/apimachinery/pkg/apis/meta/v1": func(p *Parser, pkg *loader.Package) {
-		// ObjectMeta is managed by the Kubernetes API server, so no need to
-		// generate validation for it.
-		p.Schemata[TypeIdent{Name: "ObjectMeta", Package: pkg}] = apiext.JSONSchemaProps{
-			Type: "object",
-		}
 		p.Schemata[TypeIdent{Name: "Time", Package: pkg}] = apiext.JSONSchemaProps{
 			Type:   "string",
 			Format: "date-time",