DaemonSet: Set DefaultGarbageCollectionPolicy to OrphanDependents.

Now that DaemonSet adds ControllerRef to Pods it creates,
we need to set this default so legacy behavior is maintained.

pkg/registry/extensions/daemonset/BUILD

@@ -25,6 +25,7 @@ go_library(
         "//vendor:k8s.io/apimachinery/pkg/util/validation/field",
         "//vendor:k8s.io/apiserver/pkg/endpoints/request",
         "//vendor:k8s.io/apiserver/pkg/registry/generic",
+        "//vendor:k8s.io/apiserver/pkg/registry/rest",
         "//vendor:k8s.io/apiserver/pkg/storage",
         "//vendor:k8s.io/apiserver/pkg/storage/names",
     ],
@@ -40,6 +41,7 @@ go_test(
         "//pkg/api/testapi:go_default_library",
         "//pkg/api/testing:go_default_library",
         "//pkg/apis/extensions:go_default_library",
+        "//vendor:k8s.io/apiserver/pkg/registry/rest",
     ],
 )
 

pkg/registry/extensions/daemonset/strategy.go

@@ -26,6 +26,7 @@ import (
 	"k8s.io/apimachinery/pkg/util/validation/field"
 	genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
 	"k8s.io/apiserver/pkg/registry/generic"
+	"k8s.io/apiserver/pkg/registry/rest"
 	"k8s.io/apiserver/pkg/storage"
 	"k8s.io/apiserver/pkg/storage/names"
 	"k8s.io/kubernetes/pkg/api"
@@ -42,6 +43,12 @@ type daemonSetStrategy struct {
 // Strategy is the default logic that applies when creating and updating DaemonSet objects.
 var Strategy = daemonSetStrategy{api.Scheme, names.SimpleNameGenerator}
 
+// DefaultGarbageCollectionPolicy returns Orphan because that was the default
+// behavior before the server-side garbage collection was implemented.
+func (daemonSetStrategy) DefaultGarbageCollectionPolicy() rest.GarbageCollectionPolicy {
+	return rest.OrphanDependents
+}
+
 // NamespaceScoped returns true because all DaemonSets need to be within a namespace.
 func (daemonSetStrategy) NamespaceScoped() bool {
 	return true

pkg/registry/extensions/daemonset/strategy_test.go

@@ -19,6 +19,7 @@ package daemonset
 import (
 	"testing"
 
+	"k8s.io/apiserver/pkg/registry/rest"
 	_ "k8s.io/kubernetes/pkg/api"
 	"k8s.io/kubernetes/pkg/api/testapi"
 	apitesting "k8s.io/kubernetes/pkg/api/testing"
@@ -33,3 +34,12 @@ func TestSelectableFieldLabelConversions(t *testing.T) {
 		nil,
 	)
 }
+
+func TestDefaultGarbageCollectionPolicy(t *testing.T) {
+	// Make sure we correctly implement the interface.
+	// Otherwise a typo could silently change the default.
+	var gcds rest.GarbageCollectionDeleteStrategy = Strategy
+	if got, want := gcds.DefaultGarbageCollectionPolicy(), rest.OrphanDependents; got != want {
+		t.Errorf("DefaultGarbageCollectionPolicy() = %#v, want %#v", got, want)
+	}
+}