Merge pull request #52 from Liujingfang1/master

variable reference support

pkg/types/kustomization.go

@@ -62,6 +62,9 @@ type Kustomization struct {
 	// If a secret want to have a base and an overlay, it should go to Bases and
 	// Overlays fields.
 	SecretGenerator []SecretArgs `json:"secretGenerator,omitempty" yaml:"secretGenerator,omitempty"`
+
+	// Variables which will be substituted at runtime
+	Vars []Var `json:"vars,omitempty" yaml:"vars,omitempty"`
 }
 
 // ConfigMapArg contains the metadata of how to generate a configmap.

pkg/types/var.go

@@ -0,0 +1,47 @@
+/*
+Copyright 2017 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 types
+
+import (
+	corev1 "k8s.io/api/core/v1"
+)
+
+// Var represents a variable whose value will be sourced
+// from a field in a Kubernetes object.
+type Var struct {
+	// Value of identifier name e.g. FOO used in container args, annotations
+	// Appears in pod template as $(FOO)
+	Name string `json:"name" yaml:"name"`
+
+	// ObjRef must refer to a Kubernetes resource under the
+	// purview of this kustomization. ObjRef should use the
+	// raw name of the object (the name specified in its YAML,
+	// before addition of a namePrefix).
+	ObjRef corev1.ObjectReference `json:"objref" yaml:"objref"`
+
+	// FieldRef refers to the field of the object referred to by
+	// ObjRef whose value will be extracted for use in
+	// replacing $(FOO).
+	// If unspecified, this defaults to fieldpath: metadata.name
+	FieldRef corev1.ObjectFieldSelector `json:"fieldref,omitempty" yaml:"objref,omitempty"`
+}
+
+func (v *Var) Defaulting() {
+	if (corev1.ObjectFieldSelector{}) == v.FieldRef {
+		v.FieldRef = corev1.ObjectFieldSelector{FieldPath: "metadata.name"}
+	}
+}