kustomize namespace

pkg/app/application.go

@@ -208,6 +208,8 @@ func (a *applicationImpl) getTransformer(patches []*resource.Resource) (transfor
 	}
 	ts = append(ts, ot)
 
+	ts = append(ts, transformers.NewNamespaceTransformer(string(a.kustomization.Namespace)))
+
 	npt, err := transformers.NewDefaultingNamePrefixTransformer(string(a.kustomization.NamePrefix))
 	if err != nil {
 		return nil, err

pkg/transformers/namespace.go

@@ -0,0 +1,43 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"github.com/kubernetes-sigs/kustomize/pkg/resmap"
+)
+
+type namespaceTransformer struct {
+	namespace string
+}
+
+var _ Transformer = &namespaceTransformer{}
+
+// NewNamespaceTransformer construct a namespaceTransformer.
+func NewNamespaceTransformer(ns string) Transformer {
+	if len(ns) == 0 {
+		return NewNoOpTransformer()
+	}
+	return &namespaceTransformer{namespace: ns}
+}
+
+// Transform adds the namespace.
+func (o *namespaceTransformer) Transform(m resmap.ResMap) error {
+	for _, obj := range m {
+		obj.Unstruct().SetNamespace(o.namespace)
+	}
+	return nil
+}

pkg/transformers/namespace_test.go

@@ -0,0 +1,86 @@
+/*
+Copyright 2018 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 transformers
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/resmap"
+	"github.com/kubernetes-sigs/kustomize/pkg/resource"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+)
+
+func TestNamespaceRun(t *testing.T) {
+	m := resmap.ResMap{
+		resource.NewResId(cmap, "cm1"): resource.NewBehaviorlessResource(
+			&unstructured.Unstructured{
+				Object: map[string]interface{}{
+					"apiVersion": "v1",
+					"kind":       "ConfigMap",
+					"metadata": map[string]interface{}{
+						"name": "cm1",
+					},
+				},
+			}),
+		resource.NewResId(cmap, "cm2"): resource.NewBehaviorlessResource(
+			&unstructured.Unstructured{
+				Object: map[string]interface{}{
+					"apiVersion": "v1",
+					"kind":       "ConfigMap",
+					"metadata": map[string]interface{}{
+						"name":      "cm2",
+						"namespace": "foo",
+					},
+				},
+			}),
+	}
+	expected := resmap.ResMap{
+		resource.NewResId(cmap, "cm1"): resource.NewBehaviorlessResource(
+			&unstructured.Unstructured{
+				Object: map[string]interface{}{
+					"apiVersion": "v1",
+					"kind":       "ConfigMap",
+					"metadata": map[string]interface{}{
+						"name":      "cm1",
+						"namespace": "test",
+					},
+				},
+			}),
+		resource.NewResId(cmap, "cm2"): resource.NewBehaviorlessResource(
+			&unstructured.Unstructured{
+				Object: map[string]interface{}{
+					"apiVersion": "v1",
+					"kind":       "ConfigMap",
+					"metadata": map[string]interface{}{
+						"name":      "cm2",
+						"namespace": "test",
+					},
+				},
+			}),
+	}
+
+	nst := NewNamespaceTransformer("test")
+	err := nst.Transform(m)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if !reflect.DeepEqual(m, expected) {
+		err = expected.ErrorIfNotEqual(m)
+		t.Fatalf("actual doesn't match expected: %v", err)
+	}
+}

pkg/types/kustomization.go

@@ -22,6 +22,9 @@ type Kustomization struct {
 	// file including generated configmaps and secrets.
 	NamePrefix string `json:"namePrefix,omitempty" yaml:"namePrefix,omitempty"`
 
+	// Namespace to add to all objects.
+	Namespace string `json:"namespace,omitempty" yaml:"namespace,omitempty"`
+
 	// Labels to add to all objects and selectors.
 	// These labels would also be used to form the selector for apply --prune
 	// Named differently than “labels” to avoid confusion with metadata for