add option to choose prepend/append in merge

api/filters/patchstrategicmerge/patchstrategicmerge.go

@@ -18,7 +18,12 @@ var _ kio.Filter = Filter{}
 func (pf Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 	var result []*yaml.RNode
 	for i := range nodes {
-		r, err := merge2.Merge(pf.Patch, nodes[i])
+		r, err := merge2.Merge(
+			pf.Patch, nodes[i],
+			yaml.MergeOptions{
+				ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+			},
+		)
 		if err != nil {
 			return nil, err
 		}

api/filters/patchstrategicmerge/patchstrategicmerge_test.go

@@ -67,10 +67,10 @@ spec:
   template:
     spec:
       containers:
+      - name: foo0
       - name: foo1
       - name: foo2
       - name: foo3
-      - name: foo0
 `,
 		},
 		"volumes patch": {
@@ -107,10 +107,10 @@ spec:
   template:
     spec:
       volumes:
+      - name: foo0
       - name: foo1
       - name: foo2
       - name: foo3
-      - name: foo0
 `,
 		},
 		"nested patch": {

api/krusty/baseandoverlaymedium_test.go

@@ -225,13 +225,13 @@ spec:
     spec:
       containers:
       - env:
-        - name: foo
-          value: bar
         - name: FOO
           valueFrom:
             configMapKeyRef:
               key: somekey
               name: test-infra-app-env-8h5mh7f7ch
+        - name: foo
+          value: bar
         image: nginx:1.8.0
         name: nginx
         ports:

api/krusty/generatormergeandreplace_test.go

@@ -385,12 +385,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: staging-team-foo-configmap-in-base-hc6g9dk6g9
-        name: configmap-in-base
       - configMap:
           name: staging-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: staging-team-foo-configmap-in-base-hc6g9dk6g9
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service

api/krusty/multiplepatch_test.go

@@ -146,12 +146,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: a-b-configmap-in-base-798k5k7g9f
-        name: configmap-in-base
       - configMap:
           name: a-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: a-b-configmap-in-base-798k5k7g9f
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service
@@ -351,12 +351,12 @@ spec:
       - gcePersistentDisk:
           pdName: nginx-persistent-storage
         name: nginx-persistent-storage
-      - configMap:
-          name: staging-team-foo-configmap-in-base-798k5k7g9f
-        name: configmap-in-base
       - configMap:
           name: staging-configmap-in-overlay-dc6fm46dhm
         name: configmap-in-overlay
+      - configMap:
+          name: staging-team-foo-configmap-in-base-798k5k7g9f
+        name: configmap-in-base
 ---
 apiVersion: v1
 kind: Service

examples/patchMultipleObjects.md

@@ -9,23 +9,23 @@ operation/target/value tuples in a particular
 syntax).
 
 A kustomize file lets one specify many
-patches.  Each patch must be associated with
+patches. Each patch must be associated with
 a _target selector_:
 
 [strategic merge patch]: https://github.com/kubernetes/community/blob/master/contributors/devel/sig-api-machinery/strategic-merge-patch.md
-[JSON patch]: jsonpatch.md
+[json patch]: jsonpatch.md
 
 > ```yaml
 > patches:
-> - path: <relative path to file containing patch>
->   target:
->     group: <optional group>
->     version: <optional version>
->     kind: <optional kind>
->     name: <optional name>
->     namespace: <optional namespace>
->     labelSelector: <optional label selector>
->     annotationSelector: <optional annotation selector>
+>   - path: <relative path to file containing patch>
+>     target:
+>       group: <optional group>
+>       version: <optional version>
+>       kind: <optional kind>
+>       name: <optional name>
+>       namespace: <optional namespace>
+>       labelSelector: <optional label selector>
+>       annotationSelector: <optional annotation selector>
 > ```
 
 E.g. select resources with _name_ matching `foo*`:
@@ -61,10 +61,10 @@ The example below shows how to inject a
 sidecar container for multiple Deployment
 resources.
 
-
 Make a place to work:
 
 <!-- @demoHome @testAgainstLatestRelease -->
+
 ```
 DEMO_HOME=$(mktemp -d)
 ```
@@ -72,6 +72,7 @@ DEMO_HOME=$(mktemp -d)
 Make a file describing two Deployments:
 
 <!-- @createDeployments @testAgainstLatestRelease -->
+
 ```
 cat <<EOF >$DEMO_HOME/deployments.yaml
 apiVersion: apps/v1
@@ -111,6 +112,7 @@ Declare a [strategic merge patch] file
 to inject a sidecar container:
 
 <!-- @definePatch @testAgainstLatestRelease -->
+
 ```
 cat <<EOF >$DEMO_HOME/patch.yaml
 apiVersion: apps/v1
@@ -134,6 +136,7 @@ that specifies both a `patches` and `resources`
 entry:
 
 <!-- @createKustomization @testAgainstLatestRelease -->
+
 ```
 cat <<EOF >$DEMO_HOME/kustomization.yaml
 resources:
@@ -149,6 +152,7 @@ EOF
 The expected result is:
 
 <!-- @definedExpectedOutput @testAgainstLatestRelease -->
+
 ```
 cat <<EOF >$DEMO_HOME/out_expected.yaml
 apiVersion: apps/v1
@@ -162,16 +166,16 @@ spec:
         old-label: old-value
     spec:
       containers:
-      - args:
-        - one
-        - two
-        image: nginx
-        name: nginx
       - args:
         - proxy
         - sidecar
         image: docker.io/istio/proxyv2
         name: istio-proxy
+      - args:
+        - one
+        - two
+        image: nginx
+        name: nginx
 ---
 apiVersion: apps/v1
 kind: Deployment
@@ -184,18 +188,20 @@ spec:
         key: value
     spec:
       containers:
-      - image: busybox
-        name: busybox
       - args:
         - proxy
         - sidecar
         image: docker.io/istio/proxyv2
         name: istio-proxy
+      - image: busybox
+        name: busybox
 EOF
 ```
 
 Run the build:
+
 <!-- @runIt @testAgainstLatestRelease -->
+
 ```
 kustomize build $DEMO_HOME >$DEMO_HOME/out_actual.yaml
 ```
@@ -203,6 +209,7 @@ kustomize build $DEMO_HOME >$DEMO_HOME/out_actual.yaml
 Confirm expectations:
 
 <!-- @diffShouldExitZero @testAgainstLatestRelease -->
+
 ```
 diff $DEMO_HOME/out_actual.yaml $DEMO_HOME/out_expected.yaml
 ```

kyaml/kio/filters/merge.go

@@ -67,7 +67,9 @@ func (c MergeFilter) Filter(input []*yaml.RNode) ([]*yaml.RNode, error) {
 				// first resources, don't merge it
 				merged = resources[i]
 			} else {
-				merged, err = merge2.Merge(patch, merged)
+				merged, err = merge2.Merge(patch, merged, yaml.MergeOptions{
+					ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+				})
 				if err != nil {
 					return nil, err
 				}

kyaml/yaml/merge2/element_test.go

@@ -3,6 +3,10 @@
 
 package merge2_test
 
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
 var elementTestCases = []testCase{
 	{description: `merge Element -- keep field in dest`,
 		source: `
@@ -37,6 +41,9 @@ spec:
         image: foo:v1
         command: ['run.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Element -- add field to dest`,
@@ -72,6 +79,9 @@ spec:
         image: foo:v1
         command: ['run.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Element -- add list, empty in dest`,
@@ -105,6 +115,9 @@ spec:
         image: foo:v1
         command: ['run.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Element -- add list, missing from dest`,
@@ -134,6 +147,9 @@ spec:
         image: foo:v1
         command: ['run.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Element -- add Element first`,
@@ -173,6 +189,9 @@ spec:
         image: bar:v1
         command: ['run2.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Element -- add Element second`,
@@ -212,7 +231,94 @@ spec:
         image: bar:v1
         command: ['run2.sh']
 `,
-	},
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
+  },
+  
+  {description: `merge Element -- add Element third`,
+		source: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: bar
+        image: bar:v1
+        command: ['run2.sh']
+      - name: foo
+        image: foo:v1
+`,
+		dest: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo
+        image: foo:v0
+`,
+		expected: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: bar
+        image: bar:v1
+        command: ['run2.sh']
+      - name: foo
+        image: foo:v1
+`,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+		},
+  },
+  
+  {description: `merge Element -- add Element fourth`,
+		source: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo
+        image: foo:v1
+      - name: bar
+        image: bar:v1
+        command: ['run2.sh']
+`,
+		dest: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo
+        image: foo:v0
+`,
+		expected: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo
+        image: foo:v1
+      - name: bar
+        image: bar:v1
+        command: ['run2.sh']
+`,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+		},
+  },
 
 	//
 	// Test Case
@@ -248,6 +354,9 @@ spec:
         image: bar:v1
         command: ['run2.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -290,6 +399,9 @@ spec:
         image: bar:v1
         command: ['run2.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -330,6 +442,9 @@ spec:
         image: bar:v1
         command: ['run2.sh']
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -364,6 +479,9 @@ spec:
   template:
     spec: {}
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -393,6 +511,9 @@ containers:
   command: ['run2.sh']
 `,
 		infer: true,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -431,6 +552,9 @@ spec:
         command: ['run2.sh']
 `,
 		infer: false,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -460,6 +584,9 @@ containers: # {"items":{"$ref": "#/definitions/io.k8s.api.core.v1.Container"},"t
   command: ['run2.sh']
 `,
 		infer: false,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge_primitive_finalizers`,
@@ -488,6 +615,9 @@ metadata:
   - c
   - a
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge_primitive_items`,
@@ -513,5 +643,8 @@ items:
 - c
 - a
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 }

kyaml/yaml/merge2/list_test.go

@@ -3,6 +3,10 @@
 
 package merge2_test
 
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
 var listTestCases = []testCase{
 	{description: `strategic merge patch delete 1`,
 		source: `
@@ -38,6 +42,9 @@ spec:
       - name: foo2
       - name: foo3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 	{description: `strategic merge patch delete 2`,
 		source: `
@@ -73,8 +80,48 @@ spec:
       - name: foo1
       - name: foo2
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
-	{description: `merge k8s deployment containers`,
+	{description: `merge k8s deployment containers - prepend`,
+		source: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+`,
+		dest: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo0
+`,
+		expected: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      containers:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+      - name: foo0
+      `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+		},
+	},
+	{description: `merge k8s deployment containers - append`,
 		source: `
 apiVersion: apps/v1
 kind: Deployment
@@ -107,8 +154,11 @@ spec:
       - name: foo2
       - name: foo3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
-	{description: `merge k8s deployment volumes`,
+	{description: `merge k8s deployment volumes - append`,
 		source: `
 apiVersion: apps/v1
 kind: Deployment
@@ -141,6 +191,46 @@ spec:
       - name: foo2
       - name: foo3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
+	},
+	{description: `merge k8s deployment volumes - prepend`,
+		source: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+`,
+		dest: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo0
+`,
+		expected: `
+apiVersion: apps/v1
+kind: Deployment
+spec:
+  template:
+    spec:
+      volumes:
+      - name: foo1
+      - name: foo2
+      - name: foo3
+      - name: foo0
+`,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListPrepend,
+		},
 	},
 	{description: `merge k8s deployment containers -- $patch directive`,
 		source: `
@@ -267,6 +357,9 @@ items:
 - 2
 - 3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `replace List -- missing from dest`,
@@ -287,6 +380,9 @@ items:
 - 2
 - 3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -314,6 +410,9 @@ items:
 - 2
 - 3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -337,6 +436,9 @@ items:
 - 2
 - 3
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -357,6 +459,9 @@ items:
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -378,5 +483,8 @@ items:
 kind: Deployment
 items: []
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 }

kyaml/yaml/merge2/map_test.go

@@ -3,6 +3,10 @@
 
 package merge2_test
 
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
 var mapTestCases = []testCase{
 
 	{description: `strategic merge patch delete 1`,
@@ -16,6 +20,9 @@ spec:
   foo: bar1
 `,
 		expected: ``,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `strategic merge patch delete 2`,
@@ -33,6 +40,9 @@ spec:
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `strategic merge patch delete 3`,
@@ -61,6 +71,9 @@ spec:
   metadata:
     name: wut
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `strategic merge patch delete 4`,
@@ -89,6 +102,9 @@ spec:
 `,
 		expected: `
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `strategic merge patch replace 1`,
@@ -111,6 +127,9 @@ spec:
   metal: heavy
   veggie: carrot
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- update field in dest`,
@@ -131,6 +150,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- add field to dest`,
@@ -151,6 +173,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- add list, empty in dest`,
@@ -170,6 +195,9 @@ spec:
   baz: buz
   foo: bar1
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- add list, missing from dest`,
@@ -188,6 +216,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- add Map first`,
@@ -208,6 +239,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `merge Map -- add Map second`,
@@ -228,6 +262,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -249,6 +286,9 @@ spec:
   foo: bar1
   baz: buz
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -272,6 +312,9 @@ spec:
   baz: buz
 items: {}
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -291,5 +334,8 @@ spec:
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 }

kyaml/yaml/merge2/merge2.go

@@ -12,12 +12,16 @@ import (
 )
 
 // Merge merges fields from src into dest.
-func Merge(src, dest *yaml.RNode) (*yaml.RNode, error) {
-	return walk.Walker{Sources: []*yaml.RNode{dest, src}, Visitor: Merger{}}.Walk()
+func Merge(src, dest *yaml.RNode, mergeOptions yaml.MergeOptions) (*yaml.RNode, error) {
+	return walk.Walker{
+		Sources:      []*yaml.RNode{dest, src},
+		Visitor:      Merger{},
+		MergeOptions: mergeOptions,
+	}.Walk()
 }
 
 // Merge parses the arguments, and merges fields from srcStr into destStr.
-func MergeStrings(srcStr, destStr string, infer bool) (string, error) {
+func MergeStrings(srcStr, destStr string, infer bool, mergeOptions yaml.MergeOptions) (string, error) {
 	src, err := yaml.Parse(srcStr)
 	if err != nil {
 		return "", err
@@ -31,6 +35,7 @@ func MergeStrings(srcStr, destStr string, infer bool) (string, error) {
 		Sources:               []*yaml.RNode{dest, src},
 		Visitor:               Merger{},
 		InferAssociativeLists: infer,
+		MergeOptions:          mergeOptions,
 	}.Walk()
 	if err != nil {
 		return "", err

kyaml/yaml/merge2/merge2_old_test.go

@@ -55,7 +55,9 @@ metadata:
     m: n1
 `)
 
-	result, err := Merge(src, dest)
+	result, err := Merge(src, dest, yaml.MergeOptions{
+		ListIncreaseDirection: yaml.MergeOptionsListAppend,
+	})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -114,7 +116,9 @@ metadata:
   annotations: null
 `)
 
-	result, err := Merge(src, dest)
+	result, err := Merge(src, dest, yaml.MergeOptions{
+		ListIncreaseDirection: yaml.MergeOptionsListAppend,
+	})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -174,7 +178,9 @@ metadata:
     m: n1
 `)
 
-	result, err := Merge(dest, src)
+	result, err := Merge(dest, src, yaml.MergeOptions{
+		ListIncreaseDirection: yaml.MergeOptionsListAppend,
+	})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -241,7 +247,9 @@ spec:
           value: "Another Env Not In The Dest"
 `)
 
-	result, err := Merge(src, dest)
+	result, err := Merge(src, dest, yaml.MergeOptions{
+		ListIncreaseDirection: yaml.MergeOptionsListAppend,
+	})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -305,7 +313,9 @@ spec:
         args: ['e', 'd', 'f']
 `)
 
-	result, err := Merge(src, dest)
+	result, err := Merge(src, dest, yaml.MergeOptions{
+		ListIncreaseDirection: yaml.MergeOptionsListAppend,
+	})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -365,7 +375,9 @@ a:
   b:
     # header comment
     c: d
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -385,7 +397,9 @@ a:
   b:
     c: d
     # footer comment
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -404,7 +418,9 @@ a:
 a:
   b:
     c: d # line comment
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -426,7 +442,9 @@ a:
   b:
     # replace comment
     c: d
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -447,7 +465,9 @@ a:
   b:
     c: d
     # replace comment
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -466,7 +486,9 @@ a:
 a:
   b:
     c: d # replace comment
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}
@@ -484,7 +506,9 @@ a:
 a:
   b:
     c: d # replace comment
-`, true)
+`, true, yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		})
 	if !assert.NoError(t, err) {
 		return
 	}

kyaml/yaml/merge2/merge2_test.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"sigs.k8s.io/kustomize/kyaml/kio/filters"
+	"sigs.k8s.io/kustomize/kyaml/yaml"
 	. "sigs.k8s.io/kustomize/kyaml/yaml/merge2"
 )
 
@@ -20,7 +21,7 @@ func TestMerge(t *testing.T) {
 		for j := range testCases[i] {
 			tc := testCases[i][j]
 			t.Run(tc.description, func(t *testing.T) {
-				actual, err := MergeStrings(tc.source, tc.dest, tc.infer)
+				actual, err := MergeStrings(tc.source, tc.dest, tc.infer, tc.mergeOptions)
 				if !assert.NoError(t, err, tc.description) {
 					t.FailNow()
 				}
@@ -43,9 +44,10 @@ func TestMerge(t *testing.T) {
 }
 
 type testCase struct {
-	description string
-	source      string
-	dest        string
-	expected    string
-	infer       bool
+	description  string
+	source       string
+	dest         string
+	expected     string
+	infer        bool
+	mergeOptions yaml.MergeOptions
 }

kyaml/yaml/merge2/scalar_test.go

@@ -3,6 +3,10 @@
 
 package merge2_test
 
+import (
+	"sigs.k8s.io/kustomize/kyaml/yaml"
+)
+
 var scalarTestCases = []testCase{
 	{description: `replace scalar -- different value in dest`,
 		source: `
@@ -17,6 +21,9 @@ field: value0
 kind: Deployment
 field: value1
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	{description: `replace scalar -- missing from dest`,
@@ -31,6 +38,9 @@ kind: Deployment
 kind: Deployment
 field: value1
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -49,6 +59,9 @@ field: value1
 kind: Deployment
 field: value1
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -66,6 +79,9 @@ field: value1
 kind: Deployment
 field: value1
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -83,6 +99,9 @@ field: value1
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -100,6 +119,9 @@ field: value1
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -116,6 +138,9 @@ kind: Deployment
 		expected: `
 kind: Deployment
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 
 	//
@@ -133,5 +158,8 @@ kind: Deployment
 kind: Deployment
 field: {}
 `,
+		mergeOptions: yaml.MergeOptions{
+			ListIncreaseDirection: yaml.MergeOptionsListAppend,
+		},
 	},
 }

kyaml/yaml/types.go

@@ -247,3 +247,18 @@ func String(node *yaml.Node, opts ...string) (string, error) {
 	}
 	return val, errors.Wrap(err)
 }
+
+// MergeOptionsListIncreaseDirection is the type of list growth in merge
+type MergeOptionsListIncreaseDirection int
+
+const (
+	MergeOptionsListAppend MergeOptionsListIncreaseDirection = iota
+	MergeOptionsListPrepend
+)
+
+// MergeOptions is a struct which contains the options for merge
+type MergeOptions struct {
+	// ListIncreaseDirection indicates should merge function prepend the items from
+	// source list to destination or append.
+	ListIncreaseDirection MergeOptionsListIncreaseDirection
+}

kyaml/yaml/walk/associative_sequence.go

@@ -12,92 +12,70 @@ import (
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
-func (l *Walker) walkAssociativeSequence() (*yaml.RNode, error) {
-	// may require initializing the dest node
-	dest, err := l.Sources.setDestNode(l.VisitList(l.Sources, l.Schema, AssociativeList))
-	if dest == nil || err != nil {
-		return nil, err
-	}
-
-	var key, strategy string
-	if l.Schema != nil {
-		strategy, key = l.Schema.PatchStrategyAndKey()
-	}
-	if strategy == "" && key == "" { // neither strategy nor not present in the schema -- infer the key
-		// find the list of elements we need to recursively walk
-		key, err = l.elementKey()
+// appendListNode will append the nodes from src to dst and return dst.
+// src and dst should be both sequence node. key is used to call ElementSetter.
+// ElementSetter will use key-value pair to find and set the element in sequence
+// node.
+func appendListNode(dst, src *yaml.RNode, key string) (*yaml.RNode, error) {
+	for _, elem := range src.Content() {
+		// If key is empty, we know this is a scalar value and we can directly set the
+		// node
+		if key == "" {
+			_, err := dst.Pipe(yaml.ElementSetter{Element: elem, Key: key, Value: elem.Value})
+			if err != nil {
+				return nil, err
+			}
+			continue
+		}
+		// we need to get the value for key so that we can find the element to set
+		// in sequence.
+		tmpNode := yaml.NewRNode(elem)
+		valueNode, err := tmpNode.Pipe(yaml.Get(key))
+		if err != nil {
+			return nil, err
+		}
+		if valueNode.IsNil() {
+			// no key found, directly append to dst
+			err = dst.PipeE(yaml.Append(elem))
+			if err != nil {
+				return nil, err
+			}
+			continue
+		}
+		v := valueNode.YNode().Value
+		// We use the key and value from elem to find the corresponding element in dst.
+		// Then we will use ElementSetter to replace the element with elem. If we cannot
+		// find the item, the element will be appended.
+		_, err = dst.Pipe(yaml.ElementSetter{Element: elem, Key: key, Value: v})
 		if err != nil {
 			return nil, err
 		}
 	}
+	return dst, nil
+}
 
-	// non-primitive associative list -- merge the elements
-	if key != "" {
-		values := l.elementValues(key)
-
-		// recursively set the elements in the list
-		var s *openapi.ResourceSchema
-		if l.Schema != nil {
-			s = l.Schema.Elements()
-		}
-		for _, value := range values {
-			val, err := Walker{
-				VisitKeysAsScalars:    l.VisitKeysAsScalars,
-				InferAssociativeLists: l.InferAssociativeLists,
-				Visitor:               l,
-				Schema:                s,
-				Sources:               l.elementValue(key, value),
-			}.Walk()
-			if err != nil {
-				return nil, err
-			}
-			if yaml.IsMissingOrNull(val) || yaml.IsEmptyMap(val) {
-				_, err = dest.Pipe(yaml.ElementSetter{Key: key, Value: value})
-				if err != nil {
-					return nil, err
-				}
-				continue
-			}
-
-			if val.Field(key) == nil {
-				// make sure the key is set on the field
-				_, err = val.Pipe(yaml.SetField(key, yaml.NewScalarRNode(value)))
-				if err != nil {
-					return nil, err
-				}
-			}
-
-			// this handles empty and non-empty values
-			_, err = dest.Pipe(yaml.ElementSetter{Element: val.YNode(), Key: key, Value: value})
-			if err != nil {
-				return nil, err
-			}
-		}
-		// field is empty
-		if yaml.IsMissingOrNull(dest) {
-			return nil, nil
-		}
-		return dest, nil
-	}
-
-	// primitive associative list -- merge the values
-	values := l.elementPrimitiveValues()
-	var s *openapi.ResourceSchema
+// setAssociativeSequenceElements recursively set the elements in the list
+func (l *Walker) setAssociativeSequenceElements(values []string, key string, dest *yaml.RNode) (*yaml.RNode, error) {
+	// itemsToBeAdded contains the items that will be added to dest
+	itemsToBeAdded := yaml.NewListRNode()
+	var schema *openapi.ResourceSchema
 	if l.Schema != nil {
-		s = l.Schema.Elements()
+		schema = l.Schema.Elements()
 	}
 	for _, value := range values {
 		val, err := Walker{
 			VisitKeysAsScalars:    l.VisitKeysAsScalars,
 			InferAssociativeLists: l.InferAssociativeLists,
 			Visitor:               l,
-			Schema:                s,
-			Sources:               l.elementValue(key /*empty key implies primitive*/, value),
+			Schema:                schema,
+			Sources:               l.elementValue(key, value),
+			MergeOptions:          l.MergeOptions,
 		}.Walk()
 		if err != nil {
 			return nil, err
 		}
-		if yaml.IsMissingOrNull(val) {
+		// delete the node from **dest** if it's null or empty
+		if yaml.IsMissingOrNull(val) || yaml.IsEmptyMap(val) {
 			_, err = dest.Pipe(yaml.ElementSetter{Key: key, Value: value})
 			if err != nil {
 				return nil, err
@@ -113,18 +91,60 @@ func (l *Walker) walkAssociativeSequence() (*yaml.RNode, error) {
 			}
 		}
 
-		// this handles empty and non-empty values
-		_, err = dest.Pipe(yaml.ElementSetter{Element: val.YNode(), Key: key, Value: value})
+		// Add the val to the sequence. val will replace the item in the sequence if
+		// there is an item that matches the key-value pair. Otherwise val will be appended
+		// the the sequence.
+		_, err = itemsToBeAdded.Pipe(yaml.ElementSetter{Element: val.YNode(), Key: key, Value: value})
+		if err != nil {
+			return nil, err
+		}
+	}
+	var err error
+	if l.MergeOptions.ListIncreaseDirection == yaml.MergeOptionsListPrepend {
+		// items from patches are needed to be prepended. so we append the
+		// dest to itemsToBeAdded
+		dest, err = appendListNode(itemsToBeAdded, dest, key)
+	} else {
+		// append the items
+		dest, err = appendListNode(dest, itemsToBeAdded, key)
+	}
+	if err != nil {
+		return nil, err
+	}
+	// sequence is empty
+	if yaml.IsMissingOrNull(dest) {
+		return nil, nil
+	}
+	return dest, nil
+}
+
+func (l *Walker) walkAssociativeSequence() (*yaml.RNode, error) {
+	// may require initializing the dest node
+	dest, err := l.Sources.setDestNode(l.VisitList(l.Sources, l.Schema, AssociativeList))
+	if dest == nil || err != nil {
+		return nil, err
+	}
+
+	// get the merge key from schema
+	var key, strategy string
+	if l.Schema != nil {
+		strategy, key = l.Schema.PatchStrategyAndKey()
+	}
+	if strategy == "" && key == "" { // neither strategy nor not present in the schema -- infer the key
+		// find the list of elements we need to recursively walk
+		key, err = l.elementKey()
 		if err != nil {
 			return nil, err
 		}
 	}
 
-	// field is empty
-	if yaml.IsMissingOrNull(dest) {
-		return nil, nil
+	if key != "" {
+		// non-primitive associative list -- merge the elements
+		return l.setAssociativeSequenceElements(l.elementValues(key), key, dest)
 	}
-	return dest, nil
+
+	// primitive associative list -- merge the values
+	return l.setAssociativeSequenceElements(l.elementPrimitiveValues(), key, dest)
 }
 
 // elementKey returns the merge key to use for the associative list
@@ -154,17 +174,23 @@ func (l Walker) elementKey() (string, error) {
 // elements missing from earlier sources appear later.
 func (l Walker) elementValues(key string) []string {
 	// use slice to to keep elements in the original order
-	// dest node must be first
 	var returnValues []string
 	seen := sets.String{}
+	// if we are doing append, dest node should be the first.
+	// otherwise dest node should be the last.
+	beginIdx := 0
+	if l.MergeOptions.ListIncreaseDirection == yaml.MergeOptionsListPrepend {
+		beginIdx = 1
+	}
 	for i := range l.Sources {
-		if l.Sources[i] == nil {
+		src := l.Sources[(i+beginIdx)%len(l.Sources)]
+		if src == nil {
 			continue
 		}
 
 		// add the value of the field for each element
 		// don't check error, we know this is a list node
-		values, _ := l.Sources[i].ElementValues(key)
+		values, _ := src.ElementValues(key)
 		for _, s := range values {
 			if seen.Has(s) {
 				continue
@@ -177,21 +203,25 @@ func (l Walker) elementValues(key string) []string {
 }
 
 // elementPrimitiveValues returns the primitive values in an associative list -- eg. finalizers
-// TODO: figure out the right order -- currently the order is deterministic but may be improved
-// upon.
 func (l Walker) elementPrimitiveValues() []string {
 	// use slice to to keep elements in the original order
-	// dest node must be first
 	var returnValues []string
 	seen := sets.String{}
+	// if we are doing append, dest node should be the first.
+	// otherwise dest node should be the last.
+	beginIdx := 0
+	if l.MergeOptions.ListIncreaseDirection == yaml.MergeOptionsListPrepend {
+		beginIdx = 1
+	}
 	for i := range l.Sources {
-		if l.Sources[i] == nil {
+		src := l.Sources[(i+beginIdx)%len(l.Sources)]
+		if src == nil {
 			continue
 		}
 
 		// add the value of the field for each element
 		// don't check error, we know this is a list node
-		for _, item := range l.Sources[i].YNode().Content {
+		for _, item := range src.YNode().Content {
 			if seen.Has(item.Value) {
 				continue
 			}

kyaml/yaml/walk/map.go

@@ -68,6 +68,7 @@ func (l Walker) walkMap() (*yaml.RNode, error) {
 			Visitor:               l,
 			Schema:                s,
 			Sources:               fv,
+			MergeOptions:          l.MergeOptions,
 			Path:                  append(l.Path, key)}.Walk()
 		if err != nil {
 			return nil, err

kyaml/yaml/walk/walk.go

@@ -36,8 +36,12 @@ type Walker struct {
 	// VisitKeysAsScalars if true will call VisitScalar on map entry keys,
 	// providing nil as the OpenAPI schema.
 	VisitKeysAsScalars bool
+
+	// MergeOptions is a struct to store options for merge
+	MergeOptions yaml.MergeOptions
 }
 
+// Kind returns the kind of the first non-null node in Sources.
 func (l Walker) Kind() yaml.Kind {
 	for _, s := range l.Sources {
 		if !yaml.IsMissingOrNull(s) {
@@ -47,7 +51,8 @@ func (l Walker) Kind() yaml.Kind {
 	return 0
 }
 
-// GrepFilter implements yaml.GrepFilter
+// Walk will recursively traverse every item in the Sources and perform corresponding
+// actions on them
 func (l Walker) Walk() (*yaml.RNode, error) {
 	l.Schema = l.GetSchema()
 
@@ -62,6 +67,8 @@ func (l Walker) Walk() (*yaml.RNode, error) {
 		if err := yaml.ErrorIfAnyInvalidAndNonNull(yaml.SequenceNode, l.Sources...); err != nil {
 			return nil, err
 		}
+		// AssociativeSequence means the items in the sequence are associative. They can be merged
+		// according to merge key.
 		if schema.IsAssociative(l.Schema, l.Sources, l.InferAssociativeLists) {
 			return l.walkAssociativeSequence()
 		}
@@ -129,6 +136,8 @@ const (
 	UpdatedIndex
 )
 
+// Sources are a list of RNodes. First item is the dest node, followed by
+// multiple source nodes.
 type Sources []*yaml.RNode
 
 // Dest returns the destination node
@@ -175,29 +184,3 @@ func (s Sources) setDestNode(node *yaml.RNode, err error) (*yaml.RNode, error) {
 	s[0] = node
 	return node, nil
 }
-
-type FieldSources []*yaml.MapNode
-
-// Dest returns the destination node
-func (s FieldSources) Dest() *yaml.MapNode {
-	if len(s) <= DestIndex {
-		return nil
-	}
-	return s[DestIndex]
-}
-
-// Origin returns the origin node
-func (s FieldSources) Origin() *yaml.MapNode {
-	if len(s) <= OriginIndex {
-		return nil
-	}
-	return s[OriginIndex]
-}
-
-// Updated returns the updated node
-func (s FieldSources) Updated() *yaml.MapNode {
-	if len(s) <= UpdatedIndex {
-		return nil
-	}
-	return s[UpdatedIndex]
-}

plugin/builtin/configmapgenerator/go.mod

@@ -7,4 +7,6 @@ require (
 	sigs.k8s.io/yaml v1.2.0
 )
 
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../kyaml
+
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../api

plugin/builtin/hashtransformer/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../kyaml

plugin/builtin/legacyordertransformer/go.mod

@@ -8,3 +8,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../kyaml

plugin/builtin/patchtransformer/PatchTransformer_test.go

@@ -321,13 +321,13 @@ spec:
         old-label: old-value
     spec:
       containers:
-      - image: nginx
-        name: nginx
       - args:
         - proxy
         - sidecar
         image: docker.io/istio/proxyv2
         name: istio-proxy
+      - image: nginx
+        name: nginx
 ---
 apiVersion: apps/v1
 kind: Deployment
@@ -747,10 +747,7 @@ spec:
         name: test-deployment
         ports:
         - containerPort: 8080
-          name: take-over-the-world
-          protocol: TCP
-        - containerPort: 8080
-          name: take-over-the-world
+          name: disappearing-act
           protocol: TCP
 `)
 }

plugin/builtin/patchtransformer/go.mod

@@ -4,9 +4,9 @@ go 1.14
 
 require (
 	github.com/evanphx/json-patch v4.5.0+incompatible
+	github.com/pkg/errors v0.8.1
 	sigs.k8s.io/kustomize/api v0.6.2
 	sigs.k8s.io/kustomize/kyaml v0.8.1
-	github.com/pkg/errors v0.8.1
 	sigs.k8s.io/yaml v1.2.0
 )
 

plugin/builtin/secretgenerator/go.mod

@@ -8,3 +8,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../kyaml

plugin/someteam.example.com/v1/bashedconfigmap/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/chartinflator/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/dateprefixer/go.mod

@@ -9,3 +9,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/gogetter/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/printpluginenv/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

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

@@ -8,3 +8,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/secretsfromdatabase/go.mod

@@ -8,3 +8,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/sedtransformer/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/someservicegenerator/go.mod

@@ -8,3 +8,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/stringprefixer/go.mod

@@ -9,3 +9,5 @@ require (
 )
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml

plugin/someteam.example.com/v1/validator/go.mod

@@ -5,3 +5,5 @@ go 1.14
 require sigs.k8s.io/kustomize/api v0.6.2
 
 replace sigs.k8s.io/kustomize/api v0.6.2 => ../../../../api
+
+replace sigs.k8s.io/kustomize/kyaml v0.8.1 => ../../../../kyaml