Fix resolving image name for marker name attribute

The image name was incorrectly extracted from the given reference,
yielding a trimmed version of the string and breaking the resulting
replacement value.

Signed-off-by: Aurel Canciu <aurelcanciu@gmail.com>

pkg/update/setters.go

@@ -158,7 +158,7 @@ func UpdateWithSetters(inpath, outpath string, policies []imagev1alpha1_reflect.
 		// annoyingly, neither the library imported above, nor an
 		// alternative I found, will yield the original image name;
 		// this is an easy way to get it
-		name := image[:len(tag)+1]
+		name := image[:len(image)-len(tag)-1]
 
 		imageSetter := fmt.Sprintf("%s:%s", policy.GetNamespace(), policy.GetName())
 		defs[fieldmeta.SetterDefinitionPrefix+imageSetter] = setterSchema(imageSetter, policy.Status.LatestImage)

pkg/update/testdata/setters/expected/kustomization.yaml

@@ -5,5 +5,5 @@ resources:
 - unimportant.yaml
 images:
 - name: container
-  newName: updated # {"$imagepolicy": "automation-ns:policy:name"}
+  newName: index.repo.fake/updated # {"$imagepolicy": "automation-ns:policy:name"}
   newTag: v1.0.1 # {"$imagepolicy": "automation-ns:policy:tag"}

pkg/update/testdata/setters/expected/marked.yaml

@@ -11,6 +11,6 @@ spec:
         spec:
           containers:
           - name: c
-            image: updated:v1.0.1 # {"$imagepolicy": "automation-ns:policy"}
+            image: index.repo.fake/updated:v1.0.1 # {"$imagepolicy": "automation-ns:policy"}
           - name: d
             image: image:v1.0.0 # {"$imagepolicy": "automation-ns:unchanged"}

pkg/update/update_test.go

@@ -41,16 +41,16 @@ var _ = Describe("Update image via kyaml setters2", func() {
 
 	var (
 		policies = []imagev1alpha1_reflect.ImagePolicy{
-			imagev1alpha1_reflect.ImagePolicy{
+			{
 				ObjectMeta: metav1.ObjectMeta{ // name matches marker used in testdata/setters/{original,expected}
 					Namespace: "automation-ns",
 					Name:      "policy",
 				},
 				Status: imagev1alpha1_reflect.ImagePolicyStatus{
-					LatestImage: "updated:v1.0.1",
+					LatestImage: "index.repo.fake/updated:v1.0.1",
 				},
 			},
-			imagev1alpha1_reflect.ImagePolicy{
+			{
 				ObjectMeta: metav1.ObjectMeta{ // name matches marker used in testdata/setters/{original,expected}
 					Namespace: "automation-ns",
 					Name:      "unchanged",
@@ -68,16 +68,16 @@ var _ = Describe("Update image via kyaml setters2", func() {
 		defer os.RemoveAll(tmp)
 
 		policies := []imagev1alpha1_reflect.ImagePolicy{
-			imagev1alpha1_reflect.ImagePolicy{
+			{
 				ObjectMeta: metav1.ObjectMeta{ // name matches marker used in testdata/setters/{original,expected}
 					Namespace: "automation-ns",
 					Name:      "policy",
 				},
 				Status: imagev1alpha1_reflect.ImagePolicyStatus{
-					LatestImage: "updated:v1.0.1",
+					LatestImage: "index.repo.fake/updated:v1.0.1",
 				},
 			},
-			imagev1alpha1_reflect.ImagePolicy{
+			{
 				ObjectMeta: metav1.ObjectMeta{ // name matches marker used in testdata/setters/{original,expected}
 					Namespace: "automation-ns",
 					Name:      "unchanged",
@@ -117,7 +117,7 @@ var _ = Describe("Update image via kyaml setters2", func() {
 				Name:      "foo",
 			},
 		}}
-		r, _ := name.ParseReference("updated:v1.0.1")
+		r, _ := name.ParseReference("index.repo.fake/updated:v1.0.1")
 		expectedImageRef := imageRef{r, types.NamespacedName{
 			Name:      "policy",
 			Namespace: "automation-ns",