index: fix github action tests failing

This fixes the following errors,
- use strings.ReplaceAll method instead of strings.Replace
- `infromation` is a misspelling of `information`
- var-naming: don't use underscores in Go names
- unnecessary conversion (unconvert)
- ineffectual assignment to err
- unnecessary trailing newline
- unnecessary leading newline

Signed-off-by: Husni Faiz <ahamedhusni73@gmail.com>

local/index.go

@@ -69,6 +69,10 @@ func (i *ImageIndex) Add(repoName string) error {
 	if ref.Context().Name() != indexRef.Context().Name() {
 		imgRefName := indexRef.Context().Name() + "@" + desc.Digest.Algorithm + ":" + desc.Digest.Hex
 		imgRef, err := name.ParseReference(imgRefName)
+		if err != nil {
+			return err
+		}
+
 		err = remote.Write(imgRef, img, remote.WithAuthFromKeychain(authn.DefaultKeychain))
 		if err != nil {
 			return errors.Wrapf(err, "failed to copy image '%s' to index repository", imgRef.Name())
@@ -139,8 +143,8 @@ func (i *ImageIndex) Save(additionalNames ...string) error {
 // Ex: cnbs/sample-package:hello-multiarch-universe
 // to cnbs_sample-package-hello-multiarch-universe
 func makeFileSafeName(ref string) string {
-	fileName := strings.Replace(ref, ":", "-", -1)
-	return strings.Replace(fileName, "/", "_", -1)
+	fileName := strings.ReplaceAll(ref, ":", "-")
+	return strings.ReplaceAll(fileName, "/", "_")
 }
 
 func (i *ImageIndex) Name() string {
@@ -174,8 +178,8 @@ func (i *ImageIndex) AnnotateManifest(manifestName string, opts AnnotateFields)
 		return err
 	}
 
-	for i, desc_i := range manifest.Manifests {
-		if desc_i.Digest.String() == desc.Digest.String() {
+	for i, iDesc := range manifest.Manifests {
+		if iDesc.Digest.String() == desc.Digest.String() {
 			if opts.Architecture != "" {
 				manifest.Manifests[i].Platform.Architecture = opts.Architecture
 			}
@@ -223,7 +227,7 @@ func GetIndexManifest(repoName string, path string) (v1.IndexManifest, error) {
 		return manifest, errors.Wrapf(err, "Reading local index %q in path %q", repoName, path)
 	}
 
-	err = json.Unmarshal([]byte(jsonFile), &manifest)
+	err = json.Unmarshal(jsonFile, &manifest)
 	if err != nil {
 		return manifest, errors.Wrapf(err, "Decoding local index %q", repoName)
 	}

local/index_options.go

@@ -1,8 +1,9 @@
 package local
 
 import (
-	"github.com/buildpacks/imgutil"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
+
+	"github.com/buildpacks/imgutil"
 )
 
 type ImageIndexOption func(*indexOptions) error

local/new_index.go

@@ -33,13 +33,13 @@ func NewIndex(repoName string, path string, ops ...ImageIndexOption) (*ImageInde
 			return nil, err
 		}
 
-		for _, manifest_i := range indexOpts.manifest.Manifests {
+		for _, manifest := range indexOpts.manifest.Manifests {
 			img, _ := emptyImage(imgutil.Platform{
-				Architecture: manifest_i.Platform.Architecture,
-				OS:           manifest_i.Platform.OS,
-				OSVersion:    manifest_i.Platform.OSVersion,
+				Architecture: manifest.Platform.Architecture,
+				OS:           manifest.Platform.OS,
+				OSVersion:    manifest.Platform.OSVersion,
 			})
-			index = mutate.AppendManifests(index, mutate.IndexAddendum{Add: img, Descriptor: manifest_i})
+			index = mutate.AppendManifests(index, mutate.IndexAddendum{Add: img, Descriptor: manifest})
 		}
 
 		idx := &ImageIndex{
@@ -85,7 +85,6 @@ func NewIndex(repoName string, path string, ops ...ImageIndexOption) (*ImageInde
 	}
 
 	return ridx, nil
-
 }
 
 func emptyIndex(mediaType types.MediaType) (v1.ImageIndex, error) {

remote/index.go

@@ -102,7 +102,6 @@ func (i *ImageIndex) SaveAs(name string, additionalNames ...string) error {
 	}
 
 	return nil
-
 }
 
 func (i *ImageIndex) doSave(indexName string) error {
@@ -113,10 +112,13 @@ func (i *ImageIndex) doSave(indexName string) error {
 	}
 
 	iManifest, err := i.index.IndexManifest()
+	if err != nil {
+		return err
+	}
 
 	// This for loop will check if all the referenced manifests have the plaform information.
 	// This is OPTIONAL if the target is plaform independent.
-	// Current implementation does not allow to push an index without platform infromation.
+	// Current implementation does not allow to push an index without platform information.
 	for _, j := range iManifest.Manifests {
 		switch j.MediaType {
 		case types.OCIManifestSchema1, types.DockerManifestSchema2:

remote/index_options.go

@@ -1,8 +1,9 @@
 package remote
 
 import (
-	"github.com/buildpacks/imgutil"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
+
+	"github.com/buildpacks/imgutil"
 )
 
 type ImageIndexOption func(*indexOptions) error

remote/index_test.go

@@ -29,7 +29,6 @@ func newTestIndexName(providedPrefix ...string) string {
 }
 
 func TestIndex(t *testing.T) {
-
 	dockerConfigDir, err := ioutil.TempDir("", "test.docker.config.dir")
 	h.AssertNil(t, err)
 	defer os.RemoveAll(dockerConfigDir)
@@ -77,7 +76,6 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 		when("when index is found in registry", func() {
 			it("use the index found in registry as base", func() {
 			})
-
 		})
 
 		when("#WithIndexMediaTypes", func() {
@@ -91,7 +89,6 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 				mediatype, err := idxt.MediaType()
 				h.AssertNil(t, err)
 				h.AssertEq(t, mediatype, types.OCIImageIndex)
-
 			})
 		})
 	})
@@ -106,7 +103,6 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 				err = idx.Add(manifestName)
 				h.AssertError(t, err, fmt.Sprintf("error fetching %s from registry", manifestName))
 			})
-
 		})
 
 		when("manifest name is invalid", func() {
@@ -118,7 +114,6 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 				err = idx.Add(manifestName)
 				h.AssertError(t, err, fmt.Sprintf("could not parse reference: %s", manifestName))
 			})
-
 		})
 
 		when("manifest is in registry", func() {
@@ -135,14 +130,13 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 						OS:           "linux",
 					}),
 				)
+				h.AssertNil(t, err)
 				h.AssertNil(t, img.Save())
 
 				err = idx.Add(manifestName)
 				h.AssertNil(t, err)
 			})
-
 		})
-
 	})
 
 	when("#Save", func() {
@@ -161,6 +155,7 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 						OS:           "linux",
 					}),
 				)
+				h.AssertNil(t, err)
 				h.AssertNil(t, img.Save())
 
 				h.AssertNil(t, idx.Add(manifestName))
@@ -186,7 +181,7 @@ func testIndex(t *testing.T, when spec.G, it spec.S) {
 						OS:           "linux",
 					}),
 				)
-
+				h.AssertNil(t, err)
 				h.AssertNil(t, img.Save())
 
 				h.AssertNil(t, idx.Add(manifestName))

remote/new_index.go

@@ -33,13 +33,17 @@ func NewIndex(repoName string, keychain authn.Keychain, ops ...ImageIndexOption)
 			return nil, err
 		}
 
-		for _, manifest_i := range indexOpts.manifest.Manifests {
-			img, _ := emptyImage(imgutil.Platform{
-				Architecture: manifest_i.Platform.Architecture,
-				OS:           manifest_i.Platform.OS,
-				OSVersion:    manifest_i.Platform.OSVersion,
+		for _, manifest := range indexOpts.manifest.Manifests {
+			img, err := emptyImage(imgutil.Platform{
+				Architecture: manifest.Platform.Architecture,
+				OS:           manifest.Platform.OS,
+				OSVersion:    manifest.Platform.OSVersion,
 			})
-			index = mutate.AppendManifests(index, mutate.IndexAddendum{Add: img, Descriptor: manifest_i})
+			if err != nil {
+				return nil, err
+			}
+
+			index = mutate.AppendManifests(index, mutate.IndexAddendum{Add: img, Descriptor: manifest})
 		}
 
 		idx := &ImageIndex{
@@ -85,7 +89,6 @@ func NewIndex(repoName string, keychain authn.Keychain, ops ...ImageIndexOption)
 	}
 
 	return ridx, nil
-
 }
 
 func emptyIndex(mediaType types.MediaType) (v1.ImageIndex, error) {