DaemonSetSpec.Template should not be a pointer.

pkg/apis/extensions/types.go

@@ -374,7 +374,7 @@ type DaemonSetSpec struct {
 	// that matches the template's node selector (or on every node if no node
 	// selector is specified).
 	// More info: http://releases.k8s.io/HEAD/docs/user-guide/replication-controller.md#pod-template
-	Template *api.PodTemplateSpec `json:"template,omitempty"`
+	Template api.PodTemplateSpec `json:"template"`
 
 	// Update strategy to replace existing DaemonSet pods with new pods.
 	UpdateStrategy DaemonSetUpdateStrategy `json:"updateStrategy,omitempty"`

pkg/apis/extensions/v1beta1/conversion.go

@@ -443,14 +443,8 @@ func Convert_extensions_DaemonSetSpec_To_v1beta1_DaemonSetSpec(in *extensions.Da
 	} else {
 		out.Selector = nil
 	}
-	// unable to generate simple pointer conversion for api.PodTemplateSpec -> v1.PodTemplateSpec
-	if in.Template != nil {
-		out.Template = new(v1.PodTemplateSpec)
-		if err := Convert_api_PodTemplateSpec_To_v1_PodTemplateSpec(in.Template, out.Template, s); err != nil {
-			return err
-		}
-	} else {
-		out.Template = nil
+	if err := Convert_api_PodTemplateSpec_To_v1_PodTemplateSpec(&in.Template, &out.Template, s); err != nil {
+		return err
 	}
 	if err := Convert_extensions_DaemonSetUpdateStrategy_To_v1beta1_DaemonSetUpdateStrategy(&in.UpdateStrategy, &out.UpdateStrategy, s); err != nil {
 		return err
@@ -473,14 +467,8 @@ func Convert_v1beta1_DaemonSetSpec_To_extensions_DaemonSetSpec(in *DaemonSetSpec
 	} else {
 		out.Selector = nil
 	}
-	// unable to generate simple pointer conversion for v1.PodTemplateSpec -> api.PodTemplateSpec
-	if in.Template != nil {
-		out.Template = new(api.PodTemplateSpec)
-		if err := Convert_v1_PodTemplateSpec_To_api_PodTemplateSpec(in.Template, out.Template, s); err != nil {
-			return err
-		}
-	} else {
-		out.Template = nil
+	if err := Convert_v1_PodTemplateSpec_To_api_PodTemplateSpec(&in.Template, &out.Template, s); err != nil {
+		return err
 	}
 	if err := Convert_v1beta1_DaemonSetUpdateStrategy_To_extensions_DaemonSetUpdateStrategy(&in.UpdateStrategy, &out.UpdateStrategy, s); err != nil {
 		return err

pkg/apis/extensions/v1beta1/defaults.go

@@ -29,10 +29,8 @@ func addDefaultingFuncs(scheme *runtime.Scheme) {
 			}
 		},
 		func(obj *DaemonSet) {
-			var labels map[string]string
-			if obj.Spec.Template != nil {
-				labels = obj.Spec.Template.Labels
-			}
+			labels := obj.Spec.Template.Labels
+
 			// TODO: support templates defined elsewhere when we support them in the API
 			if labels != nil {
 				if obj.Spec.Selector == nil {

pkg/apis/extensions/v1beta1/defaults_test.go

@@ -34,7 +34,7 @@ func TestSetDefaultDaemonSet(t *testing.T) {
 	defaultIntOrString := intstr.FromInt(1)
 	defaultLabels := map[string]string{"foo": "bar"}
 	period := int64(v1.DefaultTerminationGracePeriodSeconds)
-	defaultTemplate := &v1.PodTemplateSpec{
+	defaultTemplate := v1.PodTemplateSpec{
 		Spec: v1.PodSpec{
 			DNSPolicy:                     v1.DNSClusterFirst,
 			RestartPolicy:                 v1.RestartPolicyAlways,

pkg/apis/extensions/v1beta1/types.go

@@ -364,7 +364,7 @@ type DaemonSetSpec struct {
 	// that matches the template's node selector (or on every node if no node
 	// selector is specified).
 	// More info: http://releases.k8s.io/HEAD/docs/user-guide/replication-controller.md#pod-template
-	Template *v1.PodTemplateSpec `json:"template,omitempty"`
+	Template v1.PodTemplateSpec `json:"template"`
 
 	// Update strategy to replace existing DaemonSet pods with new pods.
 	UpdateStrategy DaemonSetUpdateStrategy `json:"updateStrategy,omitempty"`

pkg/apis/extensions/validation/validation.go

@@ -164,7 +164,7 @@ func ValidateDaemonSetStatusUpdate(controller, oldController *extensions.DaemonS
 }
 
 // ValidateDaemonSetTemplateUpdate tests that certain fields in the daemon set's pod template are not updated.
-func ValidateDaemonSetTemplateUpdate(podTemplate, oldPodTemplate *api.PodTemplateSpec, fldPath *field.Path) field.ErrorList {
+func ValidateDaemonSetTemplateUpdate(podTemplate, oldPodTemplate api.PodTemplateSpec, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 	podSpec := podTemplate.Spec
 	// podTemplate.Spec is not a pointer, so we can modify NodeSelector and NodeName directly.
@@ -210,20 +210,14 @@ func ValidateDaemonSetUpdateStrategy(strategy *extensions.DaemonSetUpdateStrateg
 func ValidateDaemonSetSpec(spec *extensions.DaemonSetSpec, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 
-	// The order of these checks is important because spec.Template is tested for nil value here
-	// before accessing its labels in the following check.
-	if spec.Template == nil {
-		allErrs = append(allErrs, field.Required(fldPath.Child("template"), ""))
-		return allErrs
-	}
-
 	allErrs = append(allErrs, ValidateLabelSelector(spec.Selector, fldPath.Child("selector"))...)
+
 	selector, err := extensions.LabelSelectorAsSelector(spec.Selector)
 	if err == nil && !selector.Matches(labels.Set(spec.Template.Labels)) {
 		allErrs = append(allErrs, field.Invalid(fldPath.Child("template", "metadata", "labels"), spec.Template.Labels, "`selector` does not match template `labels`"))
 	}
 
-	allErrs = append(allErrs, apivalidation.ValidatePodTemplateSpec(spec.Template, fldPath.Child("template"))...)
+	allErrs = append(allErrs, apivalidation.ValidatePodTemplateSpec(&spec.Template, fldPath.Child("template"))...)
 	// Daemons typically run on more than one node, so mark Read-Write persistent disks as invalid.
 	allErrs = append(allErrs, apivalidation.ValidateReadOnlyPersistentDisks(spec.Template.Spec.Volumes, fldPath.Child("template", "spec", "volumes"))...)
 	// RestartPolicy has already been first-order validated as per ValidatePodTemplateSpec().

pkg/client/unversioned/daemon_sets_test.go

@@ -52,7 +52,7 @@ func TestListDaemonSets(t *testing.T) {
 							},
 						},
 						Spec: extensions.DaemonSetSpec{
-							Template: &api.PodTemplateSpec{},
+							Template: api.PodTemplateSpec{},
 						},
 					},
 				},
@@ -80,7 +80,7 @@ func TestGetDaemonSet(t *testing.T) {
 					},
 				},
 				Spec: extensions.DaemonSetSpec{
-					Template: &api.PodTemplateSpec{},
+					Template: api.PodTemplateSpec{},
 				},
 			},
 		},
@@ -120,7 +120,7 @@ func TestUpdateDaemonSet(t *testing.T) {
 					},
 				},
 				Spec: extensions.DaemonSetSpec{
-					Template: &api.PodTemplateSpec{},
+					Template: api.PodTemplateSpec{},
 				},
 			},
 		},
@@ -148,7 +148,7 @@ func TestUpdateDaemonSetUpdateStatus(t *testing.T) {
 					},
 				},
 				Spec: extensions.DaemonSetSpec{
-					Template: &api.PodTemplateSpec{},
+					Template: api.PodTemplateSpec{},
 				},
 				Status: extensions.DaemonSetStatus{},
 			},
@@ -188,7 +188,7 @@ func TestCreateDaemonSet(t *testing.T) {
 					},
 				},
 				Spec: extensions.DaemonSetSpec{
-					Template: &api.PodTemplateSpec{},
+					Template: api.PodTemplateSpec{},
 				},
 			},
 		},

pkg/controller/daemon/controller.go

@@ -434,7 +434,7 @@ func (dsc *DaemonSetsController) manage(ds *extensions.DaemonSet) {
 	for i := 0; i < createDiff; i++ {
 		go func(ix int) {
 			defer createWait.Done()
-			if err := dsc.podControl.CreatePodsOnNode(nodesNeedingDaemonPods[ix], ds.Namespace, ds.Spec.Template, ds); err != nil {
+			if err := dsc.podControl.CreatePodsOnNode(nodesNeedingDaemonPods[ix], ds.Namespace, &ds.Spec.Template, ds); err != nil {
 				glog.V(2).Infof("Failed creation, decrementing expectations for set %q/%q", ds.Namespace, ds.Name)
 				dsc.expectations.CreationObserved(dsKey)
 				util.HandleError(err)

pkg/controller/daemon/controller_test.go

@@ -59,7 +59,7 @@ func newDaemonSet(name string) *extensions.DaemonSet {
 		},
 		Spec: extensions.DaemonSetSpec{
 			Selector: &extensions.LabelSelector{MatchLabels: simpleDaemonSetLabel},
-			Template: &api.PodTemplateSpec{
+			Template: api.PodTemplateSpec{
 				ObjectMeta: api.ObjectMeta{
 					Labels: simpleDaemonSetLabel,
 				},

pkg/kubectl/describe.go

@@ -960,11 +960,7 @@ func (d *DaemonSetDescriber) Describe(namespace, name string) (string, error) {
 func describeDaemonSet(daemon *extensions.DaemonSet, events *api.EventList, running, waiting, succeeded, failed int) (string, error) {
 	return tabbedString(func(out io.Writer) error {
 		fmt.Fprintf(out, "Name:\t%s\n", daemon.Name)
-		if daemon.Spec.Template != nil {
-			fmt.Fprintf(out, "Image(s):\t%s\n", makeImageList(&daemon.Spec.Template.Spec))
-		} else {
-			fmt.Fprintf(out, "Image(s):\t%s\n", "<no template>")
-		}
+		fmt.Fprintf(out, "Image(s):\t%s\n", makeImageList(&daemon.Spec.Template.Spec))
 		selector, err := extensions.LabelSelectorAsSelector(daemon.Spec.Selector)
 		if err != nil {
 			// this shouldn't happen if LabelSelector passed validation

pkg/registry/daemonset/etcd/etcd_test.go

@@ -44,7 +44,7 @@ func newValidDaemonSet() *extensions.DaemonSet {
 		},
 		Spec: extensions.DaemonSetSpec{
 			Selector: &extensions.LabelSelector{MatchLabels: map[string]string{"a": "b"}},
-			Template: &api.PodTemplateSpec{
+			Template: api.PodTemplateSpec{
 				ObjectMeta: api.ObjectMeta{
 					Labels: map[string]string{"a": "b"},
 				},

test/e2e/daemon_set.go

@@ -90,7 +90,7 @@ var _ = Describe("Daemon set [Feature:DaemonSet]", func() {
 				Name: dsName,
 			},
 			Spec: extensions.DaemonSetSpec{
-				Template: &api.PodTemplateSpec{
+				Template: api.PodTemplateSpec{
 					ObjectMeta: api.ObjectMeta{
 						Labels: label,
 					},
@@ -148,7 +148,7 @@ var _ = Describe("Daemon set [Feature:DaemonSet]", func() {
 			},
 			Spec: extensions.DaemonSetSpec{
 				Selector: &extensions.LabelSelector{MatchLabels: complexLabel},
-				Template: &api.PodTemplateSpec{
+				Template: api.PodTemplateSpec{
 					ObjectMeta: api.ObjectMeta{
 						Labels: complexLabel,
 					},