Fix discovery restmapper finding resources in non-preferred versions

Kubernetes-commit: a6316fb3a525a6a88ca74cfa76c2892455fcf832

discovery/restmapper.go

@@ -49,6 +49,7 @@ func NewRESTMapper(groupResources []*APIGroupResources, versionInterfaces meta.V
 	for _, group := range groupResources {
 		groupPriority = append(groupPriority, group.Group.Name)
 
+		// Make sure the preferred version comes first
 		if len(group.Group.PreferredVersion.Version) != 0 {
 			preferred := group.Group.PreferredVersion.Version
 			if _, ok := group.VersionedResources[preferred]; ok {
@@ -72,6 +73,21 @@ func NewRESTMapper(groupResources []*APIGroupResources, versionInterfaces meta.V
 				continue
 			}
 
+			// Add non-preferred versions after the preferred version, in case there are resources that only exist in those versions
+			if discoveryVersion.Version != group.Group.PreferredVersion.Version {
+				resourcePriority = append(resourcePriority, schema.GroupVersionResource{
+					Group:    group.Group.Name,
+					Version:  discoveryVersion.Version,
+					Resource: meta.AnyResource,
+				})
+
+				kindPriority = append(kindPriority, schema.GroupVersionKind{
+					Group:   group.Group.Name,
+					Version: discoveryVersion.Version,
+					Kind:    meta.AnyKind,
+				})
+			}
+
 			gv := schema.GroupVersion{Group: group.Group.Name, Version: discoveryVersion.Version}
 			versionMapper := meta.NewDefaultRESTMapper([]schema.GroupVersion{gv}, versionInterfaces)
 

discovery/restmapper_test.go

@@ -67,6 +67,32 @@ func TestRESTMapper(t *testing.T) {
 				},
 			},
 		},
+
+		// This group tests finding and prioritizing resources that only exist in non-preferred versions
+		{
+			Group: metav1.APIGroup{
+				Name: "unpreferred",
+				Versions: []metav1.GroupVersionForDiscovery{
+					{Version: "v1"},
+					{Version: "v2beta1"},
+					{Version: "v2alpha1"},
+				},
+				PreferredVersion: metav1.GroupVersionForDiscovery{Version: "v1"},
+			},
+			VersionedResources: map[string][]metav1.APIResource{
+				"v1": {
+					{Name: "broccoli", Namespaced: true, Kind: "Broccoli"},
+				},
+				"v2beta1": {
+					{Name: "broccoli", Namespaced: true, Kind: "Broccoli"},
+					{Name: "peas", Namespaced: true, Kind: "Pea"},
+				},
+				"v2alpha1": {
+					{Name: "broccoli", Namespaced: true, Kind: "Broccoli"},
+					{Name: "peas", Namespaced: true, Kind: "Pea"},
+				},
+			},
+		},
 	}
 
 	restMapper := NewRESTMapper(resources, nil)
@@ -123,6 +149,16 @@ func TestRESTMapper(t *testing.T) {
 				Kind:    "Job",
 			},
 		},
+		{
+			input: schema.GroupVersionResource{
+				Resource: "peas",
+			},
+			want: schema.GroupVersionKind{
+				Group:   "unpreferred",
+				Version: "v2beta1",
+				Kind:    "Pea",
+			},
+		},
 	}
 
 	for _, tc := range kindTCs {