Merge pull request #57958 from nikhita/sample-controller-crd-validation

Automatic merge from submit-queue (batch tested with PRs 57902, 57958). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Add CustomResourceValidation example in sample-controller

Add `CustomResourceValidation` example in sample-controller.

Addresses the following part of https://github.com/kubernetes/sample-controller/issues/2:

> CRDs support json-schema schemas. These CRDs don't have them. It would be nice to show how to add them

**Release note**:

```release-note
NONE
```

/assign sttts munnerz

Kubernetes-commit: 51acead08489644d30b3f1a978e0b36f228d12a7

vendor/k8s.io/apimachinery/pkg/api/meta/BUILD

@@ -52,6 +52,7 @@ go_library(
         "//vendor/k8s.io/apimachinery/pkg/runtime/schema:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/types:go_default_library",
         "//vendor/k8s.io/apimachinery/pkg/util/errors:go_default_library",
+        "//vendor/k8s.io/apimachinery/pkg/util/sets:go_default_library",
     ],
 )
 

vendor/k8s.io/apimachinery/pkg/api/meta/errors.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 
 	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/util/sets"
 )
 
 // AmbiguousResourceError is returned if the RESTMapper finds multiple matches for a resource
@@ -85,11 +86,26 @@ func (e *NoResourceMatchError) Error() string {
 
 // NoKindMatchError is returned if the RESTMapper can't find any match for a kind
 type NoKindMatchError struct {
-	PartialKind schema.GroupVersionKind
+	// GroupKind is the API group and kind that was searched
+	GroupKind schema.GroupKind
+	// SearchedVersions is the optional list of versions the search was restricted to
+	SearchedVersions []string
 }
 
 func (e *NoKindMatchError) Error() string {
-	return fmt.Sprintf("no matches for %v", e.PartialKind)
+	searchedVersions := sets.NewString()
+	for _, v := range e.SearchedVersions {
+		searchedVersions.Insert(schema.GroupVersion{Group: e.GroupKind.Group, Version: v}.String())
+	}
+
+	switch len(searchedVersions) {
+	case 0:
+		return fmt.Sprintf("no matches for kind %q in group %q", e.GroupKind.Kind, e.GroupKind.Group)
+	case 1:
+		return fmt.Sprintf("no matches for kind %q in version %q", e.GroupKind.Kind, searchedVersions.List()[0])
+	default:
+		return fmt.Sprintf("no matches for kind %q in versions %q", e.GroupKind.Kind, searchedVersions.List())
+	}
 }
 
 func IsNoMatchError(err error) bool {

vendor/k8s.io/apimachinery/pkg/api/meta/multirestmapper.go

@@ -179,7 +179,7 @@ func (m MultiRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*
 	if len(errors) > 0 {
 		return nil, utilerrors.NewAggregate(errors)
 	}
-	return nil, &NoKindMatchError{PartialKind: gk.WithVersion("")}
+	return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
 }
 
 // RESTMappings returns all possible RESTMappings for the provided group kind, or an error
@@ -204,7 +204,7 @@ func (m MultiRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string) (
 		return nil, utilerrors.NewAggregate(errors)
 	}
 	if len(allMappings) == 0 {
-		return nil, &NoKindMatchError{PartialKind: gk.WithVersion("")}
+		return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
 	}
 	return allMappings, nil
 }

vendor/k8s.io/apimachinery/pkg/api/meta/priority.go

@@ -153,7 +153,7 @@ func kindMatches(pattern schema.GroupVersionKind, kind schema.GroupVersionKind)
 }
 
 func (m PriorityRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (mapping *RESTMapping, err error) {
-	mappings, err := m.Delegate.RESTMappings(gk)
+	mappings, err := m.Delegate.RESTMappings(gk, versions...)
 	if err != nil {
 		return nil, err
 	}

vendor/k8s.io/apimachinery/pkg/api/meta/restmapper.go

@@ -472,7 +472,7 @@ func (m *DefaultRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string)
 		return nil, err
 	}
 	if len(mappings) == 0 {
-		return nil, &NoKindMatchError{PartialKind: gk.WithVersion("")}
+		return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
 	}
 	// since we rely on RESTMappings method
 	// take the first match and return to the caller
@@ -510,7 +510,7 @@ func (m *DefaultRESTMapper) RESTMappings(gk schema.GroupKind, versions ...string
 	}
 
 	if len(potentialGVK) == 0 {
-		return nil, &NoKindMatchError{PartialKind: gk.WithVersion("")}
+		return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
 	}
 
 	for _, gvk := range potentialGVK {