add replacement transformer

plugin/builtin/replacementtransformer/ReplacementTransformer_test.go

@@ -0,0 +1,196 @@
+// Copyright 2021 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).
+		PrepBuiltin("ReplacementTransformer")
+	defer th.Reset()
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: builtin
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source: 
+    kind: Deployment
+    fieldPath: spec.template.spec.containers.0.image
+  targets:
+  - select:
+      kind: Deployment
+    fieldPaths: 
+    - spec.template.spec.containers.1.image
+`, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: foobar:1
+        name: postgresdb
+`)
+}
+
+func TestReplacementTransformerFromPath(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		PrepBuiltin("ReplacementTransformer")
+	defer th.Reset()
+
+	th.WriteF("replacement.yaml", `
+source: 
+  kind: Deployment
+  fieldPath: spec.template.spec.containers.0.image
+targets:
+- select:
+    kind: Deployment
+  fieldPaths: 
+  - spec.template.spec.containers.1.image`)
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: builtin
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- path: replacement.yaml
+`, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: postgres:1.8.0
+        name: postgresdb
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: foobar:1
+        name: postgresdb
+`)
+}
+
+func TestReplacementTransformerComplexType(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t).
+		PrepBuiltin("ReplacementTransformer")
+	defer th.Reset()
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: builtin
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
+replacements:
+- source:
+    kind: Pod
+    name: pod
+    fieldPath: spec.containers
+  targets:
+  - select:
+      kind: Deployment
+    fieldPaths:
+    - spec.template.spec.containers
+`, `
+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: {}
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy3
+spec:
+  template:
+    spec:
+      containers: {}
+`)
+
+	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
+`)
+}