DaemonSet updates

It implements https://github.com/kubernetes/community/blob/master/contributors/design-proposals/daemonset-update.md
Feature https://github.com/kubernetes/features/issues/124

pkg/controller/daemon/util/daemonset_util_test.go

@@ -0,0 +1,87 @@
+/*
+Copyright 2017 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 (
+	"fmt"
+	"testing"
+
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/kubernetes/pkg/api/testapi"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/apis/extensions"
+)
+
+func newPod(podName string, nodeName string, label map[string]string) *v1.Pod {
+	pod := &v1.Pod{
+		TypeMeta: metav1.TypeMeta{APIVersion: testapi.Extensions.GroupVersion().String()},
+		ObjectMeta: metav1.ObjectMeta{
+			Labels:    label,
+			Namespace: metav1.NamespaceDefault,
+		},
+		Spec: v1.PodSpec{
+			NodeName: nodeName,
+			Containers: []v1.Container{
+				{
+					Image: "foo/bar",
+				},
+			},
+		},
+	}
+	pod.Name = podName
+	return pod
+}
+
+func TestIsPodUpdated(t *testing.T) {
+	tests := []struct {
+		templateGeneration int64
+		pod                *v1.Pod
+		isUpdated          bool
+	}{
+		{
+			int64(12345),
+			newPod("pod1", "node1", map[string]string{extensions.DaemonSetTemplateGenerationKey: "12345"}),
+			true,
+		},
+		{
+			int64(12355),
+			newPod("pod1", "node1", map[string]string{extensions.DaemonSetTemplateGenerationKey: "12345"}),
+			false,
+		},
+		{
+			int64(12355),
+			newPod("pod1", "node1", map[string]string{}),
+			false,
+		},
+	}
+	for _, test := range tests {
+		updated := IsPodUpdated(test.templateGeneration, test.pod)
+		if updated != test.isUpdated {
+			t.Errorf("IsPodUpdated returned wrong value. Expected %t, got %t. TemplateGeneration: %d", test.isUpdated, updated, test.templateGeneration)
+		}
+	}
+}
+
+func TestGetPodTemplateWithRevision(t *testing.T) {
+	generation := int64(1)
+	podTemplateSpec := v1.PodTemplateSpec{}
+	newPodTemplate := GetPodTemplateWithGeneration(podTemplateSpec, generation)
+	label, exists := newPodTemplate.ObjectMeta.Labels[extensions.DaemonSetTemplateGenerationKey]
+	if !exists || label != fmt.Sprint(generation) {
+		t.Errorf("Error in getting podTemplateSpec with label geneartion. Exists: %t, label: %s", exists, label)
+	}
+}