Convert image transformer to kyaml.

api/builtins/ImageTagTransformer.go

@@ -8,10 +8,10 @@ import (
 	"regexp"
 	"strings"
 
-	"sigs.k8s.io/kustomize/api/transform"
+	"sigs.k8s.io/kustomize/api/filters/imagetag"
-	"sigs.k8s.io/kustomize/api/types"
-
 	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -31,18 +31,18 @@ func (p *ImageTagTransformerPlugin) Config(
 
 func (p *ImageTagTransformerPlugin) Transform(m resmap.ResMap) error {
 	for _, r := range m.Resources() {
-		for _, path := range p.FieldSpecs {
+		// If you're here because someone expected any field containing
-			if !r.OrgId().IsSelected(&path.Gvk) {
+		// the string "containers" or "initContainers" to get an image
-				continue
+		// update (not just spec/template/spec/containers[], etc.) then
-			}
+		// a code change is needed.  See api/filters/imagetag/legacy
-			err := transform.MutateField(
+		// for the start of an implementation that won't use an
-				r.Map(), path.PathSlice(), false, p.mutateImage)
+		// allowlist like FsSlice, and instead walks the object looking
-			if err != nil {
+		// for fields named containers or initContainers.
-				return err
+		err := filtersutil.ApplyToJSON(imagetag.Filter{
-			}
+			ImageTag: p.ImageTag,
-		}
+			FsSlice:  p.FieldSpecs,
-		// Kept for backward compatibility
+		}, r)
-		if err := p.findAndReplaceImage(r.Map()); err != nil && r.OrgId().Kind != `CustomResourceDefinition` {
+		if err != nil {
 			return err
 		}
 	}

api/filters/imagetag/imagetag.go

@@ -11,11 +11,17 @@ import (
 	"sigs.k8s.io/kustomize/kyaml/yaml"
 )
 
+// Filter modifies an "image tag", the value used to specify the
+// name, tag, version digest etc. of (docker) container images
+// used by a pod template.
 type Filter struct {
 	// imageTag is the tag we want to apply to the inputs
+	// The name of the image is used as a key, and other fields
+	// can specify a new name, tag, etc.
 	ImageTag types.Image `json:"imageTag,omitempty" yaml:"imageTag,omitempty"`
 
-	// FsSlice contains the FieldSpecs to locate the namespace field
+	// FsSlice contains the FieldSpecs to locate an image field,
+	// e.g. Path: "spec/myContainers[]/image"
 	FsSlice types.FsSlice `json:"fieldSpecs,omitempty" yaml:"fieldSpecs,omitempty"`
 }
 
@@ -27,6 +33,12 @@ func (f Filter) Filter(nodes []*yaml.RNode) ([]*yaml.RNode, error) {
 }
 
 func (f Filter) filter(node *yaml.RNode) (*yaml.RNode, error) {
+	// FsSlice is an allowlist, not a denyList, so to deny
+	// something via configuration a new config mechanism is
+	// needed. Until then, hardcode it.
+	if f.isOnDenyList(node) {
+		return node, nil
+	}
 	if err := node.PipeE(fsslice.Filter{
 		FsSlice:  f.FsSlice,
 		SetValue: updateImageTagFn(f.ImageTag),
@@ -36,6 +48,18 @@ func (f Filter) filter(node *yaml.RNode) (*yaml.RNode, error) {
 	return node, nil
 }
 
+func (f Filter) isOnDenyList(node *yaml.RNode) bool {
+	meta, err := node.GetMeta()
+	if err != nil {
+		// A missing 'meta' field will cause problems elsewhere;
+		// ignore it here to keep the signature simple.
+		return false
+	}
+	// Ignore CRDs
+	// https://github.com/kubernetes-sigs/kustomize/issues/890
+	return meta.Kind == `CustomResourceDefinition`
+}
+
 func updateImageTagFn(imageTag types.Image) filtersutil.SetFn {
 	return func(node *yaml.RNode) error {
 		return node.PipeE(imageTagUpdater{

api/filters/imagetag/imagetag_test.go

@@ -36,7 +36,7 @@ metadata:
   name: whatever
 spec:
   containers:
-  - image: theImageShouldNotChangeInACrd
+  - image: whatever
 `,
 			filter: Filter{
 				ImageTag: types.Image{

api/konfig/builtinpluginconsts/images.go

@@ -4,7 +4,15 @@
 package builtinpluginconsts
 
 const (
-	// imageFieldSpecs is left empty since `containers` and `initContainers`
+	imagesFieldSpecs = `
-	// of *ANY* kind in *ANY* path are builtin supported in code
+images:
-	imagesFieldSpecs = ``
+- path: spec/containers[]/image
+  create: true
+- path: spec/initContainers[]/image
+  create: true
+- path: spec/template/spec/containers[]/image
+  create: true
+- path: spec/template/spec/initContainers[]/image
+  create: true
+`
 )

api/krusty/transformersimage_test.go

@@ -173,6 +173,9 @@ spec:
 `)
 }
 
+// The default configuration recognizes image paths starting
+// with "spec", not spec2 or spec3, so the latter two specs won't
+// have their image entries changed.
 func TestTransfomersImageDefaultConfig(t *testing.T) {
 	th := kusttest_test.MakeHarness(t)
 	makeTransfomersImageBase(th)
@@ -212,25 +215,25 @@ spec2:
   template:
     spec:
       containers:
-      - image: nginx:v2
+      - image: nginx:v1
         name: nginx3
-      - image: my-nginx:previous
+      - image: my-nginx:latest
         name: nginx4
 spec3:
   template:
     spec:
       initContainers:
-      - image: my-postgres:v3
+      - image: postgres:alpine-9
         name: postgresdb
-      - image: my-docker@sha256:25a0d4b4
+      - image: docker:17-git
         name: init-docker
-      - image: myprivaterepohostname:1234/my/image:v1.0.1
+      - image: myprivaterepohostname:1234/my/image:latest
         name: myImage
-      - image: myprivaterepohostname:1234/my/image:v1.0.1
+      - image: myprivaterepohostname:1234/my/image
         name: myImage2
       - image: my-app-image:v1
         name: my-app
-      - image: my-cool-app:latest
+      - image: gcr.io:8080/my-project/my-cool-app:latest
         name: my-cool-app
 `)
 }
@@ -299,11 +302,11 @@ spec3:
 	th.WriteF("/app/base/config/custom.yaml", `
 images:
 - kind: Custom
-  path: spec/template/spec/myContainers/image
+  path: spec/template/spec/myContainers[]/image
 - kind: Custom
-  path: spec2/template/spec/myContainers/image
+  path: spec2/template/spec/myContainers[]/image
 - kind: Custom
-  path: spec3/template/spec/myInitContainers/image
+  path: spec3/template/spec/myInitContainers[]/image
 `)
 }
 

plugin/builtin/imagetagtransformer/ImageTagTransformer.go

@@ -9,10 +9,10 @@ import (
 	"regexp"
 	"strings"
 
-	"sigs.k8s.io/kustomize/api/transform"
+	"sigs.k8s.io/kustomize/api/filters/imagetag"
-	"sigs.k8s.io/kustomize/api/types"
-
 	"sigs.k8s.io/kustomize/api/resmap"
+	"sigs.k8s.io/kustomize/api/types"
+	"sigs.k8s.io/kustomize/kyaml/filtersutil"
 	"sigs.k8s.io/yaml"
 )
 
@@ -35,18 +35,18 @@ func (p *plugin) Config(
 
 func (p *plugin) Transform(m resmap.ResMap) error {
 	for _, r := range m.Resources() {
-		for _, path := range p.FieldSpecs {
+		// If you're here because someone expected any field containing
-			if !r.OrgId().IsSelected(&path.Gvk) {
+		// the string "containers" or "initContainers" to get an image
-				continue
+		// update (not just spec/template/spec/containers[], etc.) then
-			}
+		// a code change is needed.  See api/filters/imagetag/legacy
-			err := transform.MutateField(
+		// for the start of an implementation that won't use an
-				r.Map(), path.PathSlice(), false, p.mutateImage)
+		// allowlist like FsSlice, and instead walks the object looking
-			if err != nil {
+		// for fields named containers or initContainers.
-				return err
+		err := filtersutil.ApplyToJSON(imagetag.Filter{
-			}
+			ImageTag: p.ImageTag,
-		}
+			FsSlice:  p.FieldSpecs,
-		// Kept for backward compatibility
+		}, r)
-		if err := p.findAndReplaceImage(r.Map()); err != nil && r.OrgId().Kind != `CustomResourceDefinition` {
+		if err != nil {
 			return err
 		}
 	}

plugin/builtin/imagetagtransformer/ImageTagTransformer_test.go

@@ -22,6 +22,9 @@ metadata:
 imageTag:
   name: nginx
   newTag: v2
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+- path: spec/template/spec/initContainers[]/image
 `, `
 group: apps
 apiVersion: v1
@@ -89,6 +92,9 @@ metadata:
 imageTag:
   name: nginx
   newName: busybox
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+- path: spec/template/spec/initContainers[]/image
 `, `
 group: apps
 apiVersion: v1
@@ -158,6 +164,9 @@ imageTag:
   name: nginx
   newName: busybox
   newTag: v2
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+- path: spec/template/spec/initContainers[]/image
 `, `
 group: apps
 apiVersion: v1
@@ -226,6 +235,9 @@ metadata:
 imageTag:
   name: nginx
   Digest: sha256:222222222222222222
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+- path: spec/template/spec/initContainers[]/image
 `, `
 group: apps
 apiVersion: v1
@@ -295,6 +307,9 @@ imageTag:
   name: nginx
   newName: busybox
   Digest: sha256:222222222222222222
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+- path: spec/template/spec/initContainers[]/image
 `, `
 group: apps
 apiVersion: v1
@@ -363,6 +378,11 @@ metadata:
 imageTag:
   name: nginx
   newTag: v2
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
+  create: true
+- path: spec/template/spec/initContainers[]/image
+  create: true
 `, `
 group: apps
 apiVersion: v1
@@ -384,8 +404,8 @@ metadata:
 spec:
   template:
     spec:
-      containers: null
+      containers: []
-      initContainers: null
+      initContainers: []
 `)
 }
 
@@ -402,6 +422,8 @@ metadata:
 imageTag:
   name: some.registry.io/my-image
   newTag: "my-fixed-tag"
+fieldSpecs:
+- path: spec/template/spec/containers[]/image
 `, `
 group: apps
 apiVersion: v1

plugin/builtin/imagetagtransformer/go.mod

@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	sigs.k8s.io/kustomize/api v0.5.1
+	sigs.k8s.io/kustomize/kyaml v0.4.1
 	sigs.k8s.io/yaml v1.2.0
 )