Support for multiple replacements in a single file when replacing using path

api/krusty/replacementtransformer_test.go

@@ -110,6 +110,67 @@ spec:
 	th.AssertActualEqualsExpected(m, expected)
 }
 
+func TestReplacementsFieldWithPathMultiple(t *testing.T) {
+	th := kusttest_test.MakeEnhancedHarness(t)
+	defer th.Reset()
+
+	th.WriteK(".", `
+resources:
+- resource.yaml
+
+replacements:
+- path: replacement.yaml
+`)
+	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
+- source: 
+    kind: Deployment
+    fieldPath: spec.template.spec.containers.0.name
+  targets:
+  - select:
+      kind: Deployment
+    fieldPaths: 
+    - spec.template.spec.containers.1.name
+`)
+	th.WriteF("resource.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
+`)
+	expected := `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: deploy
+spec:
+  template:
+    spec:
+      containers:
+      - image: foobar:1
+        name: replaced-with-digest
+      - image: foobar:1
+        name: replaced-with-digest
+`
+	m := th.Run(".", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, expected)
+}
+
 func TestReplacementTransformerWithDiamondShape(t *testing.T) {
 	th := kusttest_test.MakeEnhancedHarness(t)
 	defer th.Reset()

plugin/builtin/replacementtransformer/ReplacementTransformer.go

@@ -6,6 +6,7 @@ package main
 
 import (
 	"fmt"
+	"reflect"
 
 	"sigs.k8s.io/kustomize/api/filters/replacement"
 	"sigs.k8s.io/kustomize/api/resmap"
@@ -39,11 +40,29 @@ func (p *plugin) Config(
 			if err != nil {
 				return err
 			}
-			repl := types.Replacement{}
-			if err := yaml.Unmarshal(content, &repl); err != nil {
+			// find if the path contains a a list of replacements or a single replacement
+			var replacement interface{}
+			err = yaml.Unmarshal(content, &replacement)
+			if err != nil {
 				return err
 			}
-			p.Replacements = append(p.Replacements, repl)
+			items := reflect.ValueOf(replacement)
+			switch items.Kind() {
+			case reflect.Slice:
+				repl := []types.Replacement{}
+				if err := yaml.Unmarshal(content, &repl); err != nil {
+					return err
+				}
+				p.Replacements = append(p.Replacements, repl...)
+			case reflect.Map:
+				repl := types.Replacement{}
+				if err := yaml.Unmarshal(content, &repl); err != nil {
+					return err
+				}
+				p.Replacements = append(p.Replacements, repl)
+			default:
+				return fmt.Errorf("unsupported replacement type encountered within replacement path: %v", items.Kind())
+			}
 		} else {
 			// replacement information is already loaded
 			p.Replacements = append(p.Replacements, r.Replacement)

plugin/builtin/replacementtransformer/ReplacementTransformer_test.go

@@ -112,6 +112,68 @@ spec:
 `)
 }
 
+func TestReplacementTransformerFromPathMultiple(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
+- source: 
+    kind: Deployment
+    fieldPath: spec.template.spec.containers.0.name
+  targets:
+  - select:
+      kind: Deployment
+    fieldPaths: 
+    - spec.template.spec.containers.1.name`)
+
+	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: replaced-with-digest
+`)
+}
+
 func TestReplacementTransformerComplexType(t *testing.T) {
 	th := kusttest_test.MakeEnhancedHarness(t).
 		PrepBuiltin("ReplacementTransformer")