⚠ Generate Embedded ObjectMeta in the CRDs, plus addressed comments

go.mod

@@ -18,3 +18,4 @@ require (
 	k8s.io/apimachinery v0.20.2
 	sigs.k8s.io/yaml v1.2.0
 )
+

pkg/crd/gen.go

@@ -84,6 +84,9 @@ type Generator struct {
 	// You'll need to use "v1" to get support for features like defaulting,
 	// along with an API server that supports it (Kubernetes 1.16+).
 	CRDVersions []string `marker:"crdVersions,optional"`
+
+	// GenerateEmbeddedObjectMeta specifies if any embedded ObjectMeta in the CRD should be generated
+	GenerateEmbeddedObjectMeta *bool `marker:",optional"`
 }
 
 func (Generator) CheckFilter() loader.NodeFilter {
@@ -98,6 +101,8 @@ func (g Generator) Generate(ctx *genall.GenerationContext) error {
 		Checker:   ctx.Checker,
 		// Perform defaulting here to avoid ambiguity later
 		AllowDangerousTypes: g.AllowDangerousTypes != nil && *g.AllowDangerousTypes == true,
+		// Indicates the parser on whether to register the ObjectMeta type or not
+		GenerateEmbeddedObjectMeta: g.GenerateEmbeddedObjectMeta != nil && *g.GenerateEmbeddedObjectMeta == true,
 	}
 
 	AddKnownTypes(parser)
@@ -129,6 +134,9 @@ func (g Generator) Generate(ctx *genall.GenerationContext) error {
 		crdRaw := parser.CustomResourceDefinitions[groupKind]
 		addAttribution(&crdRaw)
 
+		// Prevent the top level metadata for the CRD to be generate regardless of the intention in the arguments
+		FixTopLevelMetadata(crdRaw)
+
 		versionedCRDs := make([]interface{}, len(crdVersions))
 		for i, ver := range crdVersions {
 			conv, err := AsVersion(crdRaw, schema.GroupVersion{Group: apiext.SchemeGroupVersion.Group, Version: ver})
@@ -269,6 +277,18 @@ func removeDefaultsFromSchemaProps(v *apiextlegacy.JSONSchemaProps) {
 	}
 }
 
+// FixTopLevelMetadata resets the schema for the top-level metadata field which is needed for CRD validation
+func FixTopLevelMetadata(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

@@ -34,8 +34,6 @@ 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",
 		}
@@ -113,6 +111,53 @@ var KnownPackages = map[string]PackageOverride{
 	},
 }
 
+// ObjectMetaPackages overrides the ObjectMeta in all types
+var ObjectMetaPackages = map[string]PackageOverride{
+	"k8s.io/apimachinery/pkg/apis/meta/v1": func(p *Parser, pkg *loader.Package) {
+		// execute the KnowPackages for `k8s.io/apimachinery/pkg/apis/meta/v1` if any
+		if f, ok := KnownPackages["k8s.io/apimachinery/pkg/apis/meta/v1"]; ok {
+			f(p, pkg)
+		}
+		// This is an allow-listed set of properties of ObjectMeta, other runtime properties are not part of this list
+		// See more discussion: https://github.com/kubernetes-sigs/controller-tools/pull/395#issuecomment-691919433
+		p.Schemata[TypeIdent{Name: "ObjectMeta", Package: pkg}] = apiext.JSONSchemaProps{
+			Type: "object",
+			Properties: map[string]apiext.JSONSchemaProps{
+				"name": apiext.JSONSchemaProps{
+					Type: "string",
+				},
+				"namespace": apiext.JSONSchemaProps{
+					Type: "string",
+				},
+				"annotations": apiext.JSONSchemaProps{
+					Type: "object",
+					AdditionalProperties: &apiext.JSONSchemaPropsOrBool{
+						Schema: &apiext.JSONSchemaProps{
+							Type: "string",
+						},
+					},
+				},
+				"labels": apiext.JSONSchemaProps{
+					Type: "object",
+					AdditionalProperties: &apiext.JSONSchemaPropsOrBool{
+						Schema: &apiext.JSONSchemaProps{
+							Type: "string",
+						},
+					},
+				},
+				"finalizers": apiext.JSONSchemaProps{
+					Type: "array",
+					Items: &apiext.JSONSchemaPropsOrArray{
+						Schema: &apiext.JSONSchemaProps{
+							Type: "string",
+						},
+					},
+				},
+			},
+		}
+	},
+}
+
 func boolPtr(b bool) *bool {
 	return &b
 }
@@ -125,4 +170,10 @@ func AddKnownTypes(parser *Parser) {
 	for pkgName, override := range KnownPackages {
 		parser.PackageOverrides[pkgName] = override
 	}
+	// if we want to generate the embedded ObjectMeta in the CRD we need to add the ObjectMetaPackages
+	if parser.GenerateEmbeddedObjectMeta {
+		for pkgName, override := range ObjectMetaPackages {
+			parser.PackageOverrides[pkgName] = override
+		}
+	}
 }

pkg/crd/parser.go

@@ -86,6 +86,9 @@ type Parser struct {
 	//       because the implementation is too difficult/clunky to promote them to category 3.
 	// TODO: Should we have a more formal mechanism for putting "type patterns" in each of the above categories?
 	AllowDangerousTypes bool
+
+	// GenerateEmbeddedObjectMeta specifies if any embedded ObjectMeta should be generated
+	GenerateEmbeddedObjectMeta bool
 }
 
 func (p *Parser) init() {

pkg/crd/parser_integration_test.go

@@ -84,6 +84,9 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 		groupKind := schema.GroupKind{Kind: "CronJob", Group: "testdata.kubebuilder.io"}
 		parser.NeedCRDFor(groupKind, nil)
 
+		By("fixing top level ObjectMeta on the CRD")
+		crd.FixTopLevelMetadata(parser.CustomResourceDefinitions[groupKind])
+
 		By("checking that no errors occurred along the way (expect for type errors)")
 		Expect(packageErrors(cronJobPkg, packages.TypeError)).NotTo(HaveOccurred())
 
@@ -133,6 +136,9 @@ var _ = Describe("CRD Generation From Parsing to CustomResourceDefinition", func
 		groupKind := schema.GroupKind{Kind: "TestQuota", Group: "plural.example.com"}
 		parser.NeedCRDFor(groupKind, nil)
 
+		By("fixing top level ObjectMeta on the CRD")
+		crd.FixTopLevelMetadata(parser.CustomResourceDefinitions[groupKind])
+
 		By("loading the desired YAML")
 		expectedFile, err := ioutil.ReadFile("plural.example.com_testquotas.yaml")
 		Expect(err).NotTo(HaveOccurred())