create namespace resource if not found

pkg/transformers/namespace.go

@@ -18,7 +18,9 @@ package transformers
 
 import (
 	"sigs.k8s.io/kustomize/pkg/gvk"
+	"sigs.k8s.io/kustomize/pkg/resid"
 	"sigs.k8s.io/kustomize/pkg/resmap"
+	"sigs.k8s.io/kustomize/pkg/resource"
 	"sigs.k8s.io/kustomize/pkg/transformers/config"
 )
 
@@ -26,12 +28,13 @@ type namespaceTransformer struct {
 	namespace        string
 	fieldSpecsToUse  []config.FieldSpec
 	fieldSpecsToSkip []config.FieldSpec
+	factory          *resource.Factory
 }
 
 var _ Transformer = &namespaceTransformer{}
 
 // NewNamespaceTransformer construct a namespaceTransformer.
-func NewNamespaceTransformer(ns string, cf []config.FieldSpec) Transformer {
+func NewNamespaceTransformer(ns string, cf []config.FieldSpec, f *resource.Factory) Transformer {
 	if len(ns) == 0 {
 		return NewNoOpTransformer()
 	}
@@ -43,11 +46,13 @@ func NewNamespaceTransformer(ns string, cf []config.FieldSpec) Transformer {
 		namespace:        ns,
 		fieldSpecsToUse:  cf,
 		fieldSpecsToSkip: skip,
+		factory:          f,
 	}
 }
 
 // Transform adds the namespace.
 func (o *namespaceTransformer) Transform(m resmap.ResMap) error {
+	o.createNamespaceIfNotFound(m)
 	mf := resmap.ResMap{}
 
 	for id := range m {
@@ -119,3 +124,22 @@ func (o *namespaceTransformer) updateClusterRoleBinding(m resmap.ResMap) {
 		objMap["subjects"] = subjects
 	}
 }
+
+func (o *namespaceTransformer) createNamespaceIfNotFound(m resmap.ResMap) {
+	id := resid.NewResId(gvk.Gvk{
+		Version: "v1",
+		Kind:    "Namespace",
+	}, o.namespace)
+	ids := m.FindByGVKN(id)
+	if len(ids) == 0 {
+		m[id] = o.factory.FromMap(
+			map[string]interface{}{
+				"apiVersion": "v1",
+				"kind":       "Namespace",
+				"metadata": map[string]interface{}{
+					"name": o.namespace,
+				},
+			},
+		)
+	}
+}