gc changes

pkg/controller/garbagecollector/patch.go

@@ -0,0 +1,54 @@
+/*
+Copyright 2016 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 garbagecollector
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/kubernetes/pkg/controller/garbagecollector/metaonly"
+)
+
+func deleteOwnerRefPatch(dependentUID types.UID, ownerUIDs ...types.UID) []byte {
+	var pieces []string
+	for _, ownerUID := range ownerUIDs {
+		pieces = append(pieces, fmt.Sprintf(`{"$patch":"delete","uid":"%s"}`, ownerUID))
+	}
+	patch := fmt.Sprintf(`{"metadata":{"ownerReferences":[%s],"uid":"%s"}}`, strings.Join(pieces, ","), dependentUID)
+	return []byte(patch)
+}
+
+// generate a patch that unsets the BlockOwnerDeletion field of all
+// ownerReferences of node.
+func (n *node) patchToUnblockOwnerReferences() ([]byte, error) {
+	var dummy metaonly.MetadataOnlyObject
+	var blockingRefs []metav1.OwnerReference
+	falseVar := false
+	for _, owner := range n.owners {
+		if owner.BlockOwnerDeletion != nil && *owner.BlockOwnerDeletion {
+			ref := owner
+			ref.BlockOwnerDeletion = &falseVar
+			blockingRefs = append(blockingRefs, ref)
+		}
+	}
+	dummy.ObjectMeta.SetOwnerReferences(blockingRefs)
+	dummy.ObjectMeta.UID = n.identity.UID
+	return json.Marshal(dummy)
+}