Prune should respect namespace

hack/testdata/prune/b.yaml

@@ -2,6 +2,7 @@ apiVersion: v1
 kind: Pod
 metadata:
   name: b
+  namespace: nsb
   labels:
     prune-group: "true"
 spec:

staging/src/k8s.io/kubectl/pkg/cmd/apply/apply.go

@@ -635,6 +635,9 @@ See http://k8s.io/docs/reference/using-api/api-concepts/#conflicts`, err)
 	}
 
 	for n := range visitedNamespaces {
+		if len(o.Namespace) != 0 && n != o.Namespace {
+			continue
+		}
 		for _, m := range namespacedRESTMappings {
 			if err := p.prune(n, m); err != nil {
 				return fmt.Errorf("error pruning namespaced object %v: %v", m.GroupVersionKind, err)

test/cmd/apply.sh

@@ -144,6 +144,19 @@ __EOF__
   output_message=$(! kubectl get pods a 2>&1 "${kube_flags[@]:?}")
   kube::test::if_has_string "${output_message}" 'pods "a" not found'
 
+  kubectl delete pods a
+  kubectl delete pods b
+
+  # apply a
+  kubectl apply --namespace nsb -l prune-group=true -f hack/testdata/prune/a.yaml "${kube_flags[@]:?}"
+  # apply b with namespace
+  kubectl apply --namespace nsb --prune -l prune-group=true -f hack/testdata/prune/b.yaml "${kube_flags[@]:?}"
+  # check right pod exists
+  kube::test::get_object_assert 'pods b' "{{${id_field:?}}}" 'b'
+  # check wrong pod doesn't exist
+  output_message=$(! kubectl get pods a 2>&1 "${kube_flags[@]:?}")
+  kube::test::if_has_string "${output_message}" 'pods "a" not found'
+
   # cleanup
   kubectl delete pods b