add PatchJson6902Factory to make transformer

pkg/patch/transformer/util.go

@@ -0,0 +1,47 @@
+/*
+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 transformer
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/resmap"
+	"github.com/kubernetes-sigs/kustomize/pkg/resource"
+)
+
+func findTargetObj(m resmap.ResMap, targetId resource.ResId) (*resource.Resource, error) {
+	matchedIds := m.FindByGVKN(targetId)
+	if targetId.Namespace() != "" {
+		ids := []resource.ResId{}
+		for _, id := range matchedIds {
+			if id.Namespace() == targetId.Namespace() {
+				ids = append(ids, id)
+			}
+		}
+		matchedIds = ids
+	}
+
+	if len(matchedIds) == 0 {
+		log.Printf("Couldn't find any object to apply the json patch %v, skipping it.", targetId)
+		return nil, nil
+	}
+	if len(matchedIds) > 1 {
+		return nil, fmt.Errorf("found multiple objects that the patch can apply %v", matchedIds)
+	}
+	return m[matchedIds[0]], nil
+}