get the resource.Info out of the conversion business

pkg/kubectl/cmd/util/conversion.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"k8s.io/apimachinery/pkg/api/meta"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/kubernetes/pkg/api/legacyscheme"
+)
+
+// AsDefaultVersionedOrOriginal returns the object as a Go object in the external form if possible (matching the
+// group version kind of the mapping if provided, a best guess based on serialization if not provided, or obj if it cannot be converted.
+// TODO update call sites to specify the scheme they want on their builder.
+func AsDefaultVersionedOrOriginal(obj runtime.Object, mapping *meta.RESTMapping) runtime.Object {
+	converter := runtime.ObjectConvertor(legacyscheme.Scheme)
+	groupVersioner := runtime.GroupVersioner(schema.GroupVersions(legacyscheme.Registry.RegisteredGroupVersions()))
+	if mapping != nil {
+		groupVersioner = mapping.GroupVersionKind.GroupVersion()
+	}
+
+	if obj, err := converter.ConvertToVersion(obj, groupVersioner); err == nil {
+		return obj
+	}
+	return obj
+}