drop type field from the CRD schema validation at the root level

This is required to support k8s 1.11

kubernetes/kubernetes#65293

Author: droot

cmd/internal/codegen/parse/crd.go

@@ -41,8 +41,11 @@ func (b *APIs) parseCRDs() {
 			for _, resource := range version.Resources {
 				if IsAPIResource(resource.Type) {
 					resource.JSONSchemaProps, resource.Validation =
-						b.typeToJSONSchemaProps(resource.Type, sets.NewString(), []string{})
-
+						b.typeToJSONSchemaProps(resource.Type, sets.NewString(), []string{}, true)
+					// k8s 1.11 rejects CRDs with type property at the root if status sub-resources enabled.
+					// This change drops the type field for CRD at the root level. Refer to issue below:
+					// https://github.com/kubernetes/kubernetes/issues/65293
+					resource.JSONSchemaProps.Type = ""
 					j, err := json.MarshalIndent(resource.JSONSchemaProps, "", "    ")
 					if err != nil {
 						log.Fatalf("Could not Marshall validation %v\n", err)
@@ -114,7 +117,7 @@ func (b *APIs) getMeta() string {
 
 // typeToJSONSchemaProps returns a JSONSchemaProps object and its serialization
 // in Go that describe the JSONSchema validations for the given type.
-func (b *APIs) typeToJSONSchemaProps(t *types.Type, found sets.String, comments []string) (v1beta1.JSONSchemaProps, string) {
+func (b *APIs) typeToJSONSchemaProps(t *types.Type, found sets.String, comments []string, isRoot bool) (v1beta1.JSONSchemaProps, string) {
 	// Special cases
 	time := types.Name{Name: "Time", Package: "k8s.io/apimachinery/pkg/apis/meta/v1"}
 	meta := types.Name{Name: "ObjectMeta", Package: "k8s.io/apimachinery/pkg/apis/meta/v1"}
@@ -136,17 +139,17 @@ func (b *APIs) typeToJSONSchemaProps(t *types.Type, found sets.String, comments
 	case types.Builtin:
 		v, s = b.parsePrimitiveValidation(t, found, comments)
 	case types.Struct:
-		v, s = b.parseObjectValidation(t, found, comments)
+		v, s = b.parseObjectValidation(t, found, comments, isRoot)
 	case types.Map:
 		v, s = b.parseMapValidation(t, found, comments)
 	case types.Slice:
 		v, s = b.parseArrayValidation(t, found, comments)
 	case types.Array:
 		v, s = b.parseArrayValidation(t, found, comments)
 	case types.Pointer:
-		v, s = b.typeToJSONSchemaProps(t.Elem, found, comments)
+		v, s = b.typeToJSONSchemaProps(t.Elem, found, comments, false)
 	case types.Alias:
-		v, s = b.typeToJSONSchemaProps(t.Underlying, found, comments)
+		v, s = b.typeToJSONSchemaProps(t.Underlying, found, comments, false)
 	default:
 		log.Fatalf("Unknown supported Kind %v\n", t.Kind)
 	}
@@ -256,7 +259,7 @@ var mapTemplate = template.Must(template.New("map-template").Parse(
 // parseMapValidation returns a JSONSchemaProps object and its serialization in
 // Go that describe the validations for the given map type.
 func (b *APIs) parseMapValidation(t *types.Type, found sets.String, comments []string) (v1beta1.JSONSchemaProps, string) {
-	additionalProps, result := b.typeToJSONSchemaProps(t.Elem, found, comments)
+	additionalProps, result := b.typeToJSONSchemaProps(t.Elem, found, comments, false)
 	props := v1beta1.JSONSchemaProps{
 		Type: "object",
 	}
@@ -304,7 +307,7 @@ type arrayTemplateArgs struct {
 // parseArrayValidation returns a JSONSchemaProps object and its serialization in
 // Go that describe the validations for the given array type.
 func (b *APIs) parseArrayValidation(t *types.Type, found sets.String, comments []string) (v1beta1.JSONSchemaProps, string) {
-	items, result := b.typeToJSONSchemaProps(t.Elem, found, comments)
+	items, result := b.typeToJSONSchemaProps(t.Elem, found, comments, false)
 	props := v1beta1.JSONSchemaProps{
 		Type:  "array",
 		Items: &v1beta1.JSONSchemaPropsOrArray{Schema: &items},
@@ -330,11 +333,17 @@ type objectTemplateArgs struct {
 	v1beta1.JSONSchemaProps
 	Fields   map[string]string
 	Required []string
+	IsRoot   bool
 }
 
+// Drop the "type" field from the CRD validation schema at the root level.
+// K8s 1.11 server rejects such CRDs. Refer to issue below for more details:
+// https://github.com/kubernetes/kubernetes/issues/65293
 var objectTemplate = template.Must(template.New("object-template").Parse(
 	`v1beta1.JSONSchemaProps{
+	{{ if not .IsRoot -}}
     Type:                 "object",
+	{{ end -}}
     Properties: map[string]v1beta1.JSONSchemaProps{
         {{ range $k, $v := .Fields -}}
         "{{ $k }}": {{ $v }},
@@ -349,14 +358,14 @@ var objectTemplate = template.Must(template.New("object-template").Parse(
 
 // parseObjectValidation returns a JSONSchemaProps object and its serialization in
 // Go that describe the validations for the given object type.
-func (b *APIs) parseObjectValidation(t *types.Type, found sets.String, comments []string) (v1beta1.JSONSchemaProps, string) {
+func (b *APIs) parseObjectValidation(t *types.Type, found sets.String, comments []string, isRoot bool) (v1beta1.JSONSchemaProps, string) {
 	buff := &bytes.Buffer{}
 	props := v1beta1.JSONSchemaProps{
 		Type: "object",
 	}
 
 	if strings.HasPrefix(t.Name.String(), "k8s.io/api") {
-		if err := objectTemplate.Execute(buff, objectTemplateArgs{props, nil, nil}); err != nil {
+		if err := objectTemplate.Execute(buff, objectTemplateArgs{props, nil, nil, false}); err != nil {
 			log.Fatalf("%v", err)
 		}
 	} else {
@@ -369,7 +378,7 @@ func (b *APIs) parseObjectValidation(t *types.Type, found sets.String, comments
 			getValidation(l, &props)
 		}
 
-		if err := objectTemplate.Execute(buff, objectTemplateArgs{props, result, required}); err != nil {
+		if err := objectTemplate.Execute(buff, objectTemplateArgs{props, result, required, isRoot}); err != nil {
 			log.Fatalf("%v", err)
 		}
 	}
@@ -533,7 +542,7 @@ func (b *APIs) getMembers(t *types.Type, found sets.String) (map[string]v1beta1.
 			}
 			required = append(required, re...)
 		} else {
-			m, r := b.typeToJSONSchemaProps(member.Type, found, member.CommentLines)
+			m, r := b.typeToJSONSchemaProps(member.Type, found, member.CommentLines, false)
 			members[name] = m
 			result[name] = r
 			if !strings.HasSuffix(strat, "omitempty") {

common.sh

@@ -42,6 +42,7 @@ cd "$base_dir" || {
 }
 
 k8s_version=1.10.1
+#k8s_version=1.11.0
 goarch=amd64
 goos="unknown"
 
@@ -163,4 +164,4 @@ function dump_cache {
   if [ -d "$TEST_DEP" ]; then
     cp -r $TEST_DEP/* .
   fi
-}
+}

test/data/resource/expected/crd-expected.yaml

@@ -64,7 +64,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames:

test/projects/memcached-api-server/test/hack/install.yaml

@@ -38,7 +38,6 @@ spec:
                 type: string
               type: array
           type: object
-      type: object
   version: v1alpha1
 status:
   acceptedNames:

test/projects/validations/test/hack/install.yaml

@@ -69,7 +69,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1
 status:
   acceptedNames:

test_existing_projects.sh

@@ -20,6 +20,6 @@ set -o pipefail
 for p in ./test/projects/*
 do
     if [[ -d "$p" ]]; then
-        go test -v "$p"
+        go test -v -count=1 "$p"
     fi
 done

testv0.sh

@@ -86,7 +86,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames:
@@ -184,7 +183,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames:
@@ -293,7 +291,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames:
@@ -336,7 +333,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames:
@@ -371,7 +367,6 @@ spec:
           type: object
         status:
           type: object
-      type: object
   version: v1beta1
 status:
   acceptedNames: