Merge pull request #47263 from nikhita/crd-01-validation-types

Automatic merge from submit-queue

apiextensions: validation for customresources

- [x] Add types for validation of CustomResources
- [x] Fix conversion-gen: #49747
- [x] Fix defaulter-gen: kubernetes/gengo#61
- [x] Convert to OpenAPI types
- [x] Validate CR using go-openapi
- [x] Validate CRD Schema
- [x] Add integration tests
- [x] Fix round trip tests: #51204 
- [x] Add custom fuzzer functions
- [x] Add custom conversion functions
- [x] Fix data race while updating CRD: #50098 
- [x] Add feature gate for CustomResourceValidation
- [x] Fix protobuf generation

Proposal: kubernetes/community#708
Additional discussion: #49879, #50625

**Release note**:

```release-note
Add validation for CustomResources via JSON Schema.
```

/cc @sttts @deads2k

hack/.golint_failures

@@ -548,6 +548,7 @@ staging/src/k8s.io/apiextensions-apiserver/pkg/client/informers/internalversion/
 staging/src/k8s.io/apiextensions-apiserver/pkg/cmd/server
 staging/src/k8s.io/apiextensions-apiserver/pkg/controller/finalizer
 staging/src/k8s.io/apiextensions-apiserver/pkg/controller/status
+staging/src/k8s.io/apiextensions-apiserver/pkg/features
 staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresource
 staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresourcedefinition
 staging/src/k8s.io/apiextensions-apiserver/test/integration/testserver

pkg/features/BUILD

@@ -9,6 +9,7 @@ go_library(
     name = "go_default_library",
     srcs = ["kube_features.go"],
     deps = [
+        "//vendor/k8s.io/apiextensions-apiserver/pkg/features:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/features:go_default_library",
         "//vendor/k8s.io/apiserver/pkg/util/feature:go_default_library",
     ],

pkg/features/kube_features.go

@@ -17,6 +17,7 @@ limitations under the License.
 package features
 
 import (
+	apiextensionsfeatures "k8s.io/apiextensions-apiserver/pkg/features"
 	genericfeatures "k8s.io/apiserver/pkg/features"
 	utilfeature "k8s.io/apiserver/pkg/util/feature"
 )
@@ -44,13 +45,6 @@ const (
 	// alpha: v1.4
 	DynamicKubeletConfig utilfeature.Feature = "DynamicKubeletConfig"
 
-	// owner: tallclair
-	// alpha: v1.5
-	//
-	// StreamingProxyRedirects controls whether the apiserver should intercept (and follow)
-	// redirects from the backend (Kubelet) for streaming requests (exec/attach/port-forward).
-	StreamingProxyRedirects utilfeature.Feature = genericfeatures.StreamingProxyRedirects
-
 	// owner: @pweil-
 	// alpha: v1.5
 	//
@@ -158,11 +152,16 @@ var defaultKubernetesFeatureGates = map[utilfeature.Feature]utilfeature.FeatureS
 	DebugContainers:                             {Default: false, PreRelease: utilfeature.Alpha},
 	PodPriority:                                 {Default: false, PreRelease: utilfeature.Alpha},
 	EnableEquivalenceClassCache:                 {Default: false, PreRelease: utilfeature.Alpha},
+	TaintNodesByCondition:                       {Default: false, PreRelease: utilfeature.Alpha},
 
 	// inherited features from generic apiserver, relisted here to get a conflict if it is changed
 	// unintentionally on either side:
-	StreamingProxyRedirects:          {Default: true, PreRelease: utilfeature.Beta},
-	genericfeatures.AdvancedAuditing: {Default: false, PreRelease: utilfeature.Alpha},
-	TaintNodesByCondition:            {Default: false, PreRelease: utilfeature.Alpha},
-	genericfeatures.Initializers:     {Default: false, PreRelease: utilfeature.Alpha},
+	genericfeatures.StreamingProxyRedirects: {Default: true, PreRelease: utilfeature.Beta},
+	genericfeatures.AdvancedAuditing:        {Default: false, PreRelease: utilfeature.Alpha},
+	genericfeatures.APIResponseCompression:  {Default: false, PreRelease: utilfeature.Alpha},
+	genericfeatures.Initializers:            {Default: false, PreRelease: utilfeature.Alpha},
+
+	// inherited features from apiextensions-apiserver, relisted here to get a conflict if it is changed
+	// unintentionally on either side:
+	apiextensionsfeatures.CustomResourceValidation: {Default: false, PreRelease: utilfeature.Alpha},
 }

staging/src/k8s.io/apiextensions-apiserver/BUILD

@@ -45,6 +45,7 @@ filegroup(
         "//staging/src/k8s.io/apiextensions-apiserver/pkg/cmd/server:all-srcs",
         "//staging/src/k8s.io/apiextensions-apiserver/pkg/controller/finalizer:all-srcs",
         "//staging/src/k8s.io/apiextensions-apiserver/pkg/controller/status:all-srcs",
+        "//staging/src/k8s.io/apiextensions-apiserver/pkg/features:all-srcs",
         "//staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresource:all-srcs",
         "//staging/src/k8s.io/apiextensions-apiserver/pkg/registry/customresourcedefinition:all-srcs",
         "//staging/src/k8s.io/apiextensions-apiserver/test/integration:all-srcs",

staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/BUILD

@@ -9,10 +9,12 @@ load(
 go_library(
     name = "go_default_library",
     srcs = [
+        "deepcopy.go",
         "doc.go",
         "helpers.go",
         "register.go",
         "types.go",
+        "types_jsonschema.go",
         "zz_generated.deepcopy.go",
     ],
     deps = [