add replacement type and an example transformer

plugin/someteam.example.com/v1/replacementtransformer/ReplacementTransformer_test.go

@@ -0,0 +1,385 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main_test
+
+import (
+	"testing"
+
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+)
+
+func TestReplacementTransformer(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		BuildGoPlugin("someteam.example.com", "v1", "ReplacementTransformer")
+	defer th.Reset()
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: someteam.example.com/v1
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    value: nginx:newtag
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers[name=nginx-latest].image
+- source:
+    value: postgres:latest
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers.3.image
+`, `
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:latest
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: v1
+group: apps
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx-tagged
+      - image: nginx:newtag
+        name: nginx-latest
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:latest
+        name: postgresdb
+      initContainers:
+      - image: nginx
+        name: nginx-notag
+      - image: nginx@sha256:111111111111111111
+        name: nginx-sha256
+      - image: alpine:1.8.0
+        name: init-alpine
+`)
+}
+
+func TestReplacementTransformerComplexType(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		BuildGoPlugin("someteam.example.com", "v1", "ReplacementTransformer")
+	defer th.Reset()
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: someteam.example.com/v1
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    objref:
+      kind: Pod
+      name: pod
+    fieldref: spec.containers
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers
+`, `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod
+spec:
+  containers:
+  - name: myapp-container
+    image: busybox
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy2
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy3
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: v1
+kind: Pod
+metadata:
+  name: pod
+spec:
+  containers:
+  - image: busybox
+    name: myapp-container
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy2
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox
+        name: myapp-container
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy3
+spec:
+  template:
+    spec:
+      containers:
+      - image: busybox
+        name: myapp-container
+`)
+}
+
+func TestReplacementTransformerFromConfigMap(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		BuildGoPlugin("someteam.example.com", "v1", "ReplacementTransformer")
+	defer th.Reset()
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: someteam.example.com/v1
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    objref:
+      kind: ConfigMap
+      name: cm
+    fieldref: data.HOSTNAME
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers[image=debian].args.0
+    - spec.template.spec.containers[name=busybox].args.1
+- source:
+    objref:
+      kind: ConfigMap
+      name: cm
+    fieldref: data.PORT
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers[image=debian].args.1
+    - spec.template.spec.containers[name=busybox].args.2
+`, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+  labels:
+    foo: bar
+spec:
+  template:
+    metadata:
+      labels:
+        foo: bar
+    spec:
+      containers:
+        - name: command-demo-container
+          image: debian
+          command: ["printenv"]
+          args:
+            - HOSTNAME
+            - PORT
+        - name: busybox
+          image: busybox:latest
+          args:
+            - echo
+            - HOSTNAME
+            - PORT
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cm
+data:
+  HOSTNAME: example.com
+  PORT: 8080
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  labels:
+    foo: bar
+  name: deploy
+spec:
+  template:
+    metadata:
+      labels:
+        foo: bar
+    spec:
+      containers:
+      - args:
+        - example.com
+        - 8080
+        command:
+        - printenv
+        image: debian
+        name: command-demo-container
+      - args:
+        - echo
+        - example.com
+        - 8080
+        image: busybox:latest
+        name: busybox
+---
+apiVersion: v1
+data:
+  HOSTNAME: example.com
+  PORT: 8080
+kind: ConfigMap
+metadata:
+  name: cm
+`)
+}
+
+func TestReplacementTransformerWithDiamondShape(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		BuildGoPlugin("someteam.example.com", "v1", "ReplacementTransformer")
+	defer th.Reset()
+
+	th.WriteF("/app/base/deployment.yaml",
+		`
+group: apps
+apiVersion: v1
+kind: Deployment
+metadata:
+  name: deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:1.7.9
+        name: nginx
+`)
+
+	th.WriteF("/app/base/kustomization.yaml",
+		`
+resources:
+- deployment.yaml
+`)
+
+	th.WriteF("/app/a/kustomization.yaml",
+		`
+nameprefix: a-
+resources:
+- ../base
+transformers:
+- replacement.yaml
+`)
+
+	th.WriteF("/app/a/replacement.yaml",
+		`
+apiVersion: someteam.example.com/v1
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    value: nginx:newtagA
+  target:
+    objref:
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers[name=nginx].image
+`)
+
+	th.WriteF("/app/b/kustomization.yaml",
+		`
+nameprefix: b-
+resources:
+- ../base
+transformers:
+- replacement.yaml
+`)
+
+	th.WriteF("/app/b/replacement.yaml",
+		`
+apiVersion: someteam.example.com/v1
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    value: nginx:newtagB
+  target:
+    objref: 
+      kind: Deployment
+    fieldrefs:
+    - spec.template.spec.containers[name=nginx].image
+`)
+
+
+	th.WriteF("/app/combined/kustomization.yaml",
+		`
+resources:
+- ../a
+- ../b
+`)
+
+	m := th.Run("/app/combined", th.MakeOptionsPluginsEnabled())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: v1
+group: apps
+kind: Deployment
+metadata:
+  name: a-deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:newtagA
+        name: nginx
+---
+apiVersion: v1
+group: apps
+kind: Deployment
+metadata:
+  name: b-deploy1
+spec:
+  template:
+    spec:
+      containers:
+      - image: nginx:newtagB
+        name: nginx
+`)
+}