Fix gometalint errors

Signed-off-by: Manish Tomar <manish.tomar@docker.com>

registry/storage/paths.go

@@ -133,10 +133,7 @@ func pathFor(spec pathSpec) (string, error) {
 		return path.Join(append(append(repoPrefix, v.name, "_manifests", "revisions"), components...)...), nil
 	case manifestRevisionLinkPathSpec:
-		root, err := pathFor(manifestRevisionPathSpec{
-			name:     v.name,
-			revision: v.revision,
-		})
+		root, err := pathFor(manifestRevisionPathSpec(v))
 		if err != nil {
 			return "", err
@@ -156,10 +153,7 @@ func pathFor(spec pathSpec) (string, error) {
 		return path.Join(root, v.tag), nil
 	case manifestTagCurrentPathSpec:
-		root, err := pathFor(manifestTagPathSpec{
-			name: v.name,
-			tag:  v.tag,
-		})
+		root, err := pathFor(manifestTagPathSpec(v))
 		if err != nil {
 			return "", err
@@ -167,10 +161,7 @@ func pathFor(spec pathSpec) (string, error) {
 		return path.Join(root, "current", "link"), nil
 	case manifestTagIndexPathSpec:
-		root, err := pathFor(manifestTagPathSpec{
-			name: v.name,
-			tag:  v.tag,
-		})
+		root, err := pathFor(manifestTagPathSpec(v))
 		if err != nil {
 			return "", err
@@ -178,11 +169,7 @@ func pathFor(spec pathSpec) (string, error) {
 		return path.Join(root, "index"), nil
 	case manifestTagIndexEntryLinkPathSpec:
-		root, err := pathFor(manifestTagIndexEntryPathSpec{
-			name:     v.name,
-			tag:      v.tag,
-			revision: v.revision,
-		})
+		root, err := pathFor(manifestTagIndexEntryPathSpec(v))
 		if err != nil {
 			return "", err

registry/storage/paths_test.go

@@ -10,7 +10,6 @@ func TestPathMapper(t *testing.T) {
 	for _, testcase := range []struct {
 		spec     pathSpec
 		expected string
-		err      error
 	}{
 		{
 			spec: manifestRevisionPathSpec{

registry/storage/purgeuploads.go

@@ -59,7 +59,7 @@ func PurgeUploads(ctx context.Context, driver storageDriver.StorageDriver, older
 // file, so gather files by UUID with a date from startedAt.
 func getOutstandingUploads(ctx context.Context, driver storageDriver.StorageDriver) (map[string]uploadData, []error) {
 	var errors []error
-	uploads := make(map[string]uploadData, 0)
+	uploads := make(map[string]uploadData)
 	inUploadDir := false
 	root, err := pathFor(repositoriesRootPathSpec{})

registry/storage/purgeuploads_test.go

@@ -118,7 +118,7 @@ func TestPurgeOnlyUploads(t *testing.T) {
 		t.Fatalf(err.Error())
 	}
 	nonUploadPath := strings.Replace(dataPath, "_upload", "_important", -1)
-	if strings.Index(nonUploadPath, "_upload") != -1 {
+	if strings.Contains(nonUploadPath, "_upload") {
 		t.Fatalf("Non-upload path not created correctly")
 	}
@@ -132,7 +132,7 @@ func TestPurgeOnlyUploads(t *testing.T) {
 		t.Error("Unexpected errors", errs)
 	}
 	for _, file := range deleted {
-		if strings.Index(file, "_upload") == -1 {
+		if !strings.Contains(file, "_upload") {
 			t.Errorf("Non-upload file deleted")
 		}
 	}

registry/storage/schema2manifesthandler.go

@@ -14,9 +14,8 @@ import (
 )
 var (
-	errUnexpectedURL = errors.New("unexpected URL on layer")
-	errMissingURL    = errors.New("missing URL on layer")
-	errInvalidURL    = errors.New("invalid URL on layer")
+	errMissingURL = errors.New("missing URL on layer")
+	errInvalidURL = errors.New("invalid URL on layer")
 )
 //schema2ManifestHandler is a ManifestHandler that covers schema2 manifests.

registry/storage/tagstore.go

@@ -50,25 +50,6 @@ func (ts *tagStore) All(ctx context.Context) ([]string, error) {
 	return tags, nil
 }
-// exists returns true if the specified manifest tag exists in the repository.
-func (ts *tagStore) exists(ctx context.Context, tag string) (bool, error) {
-	tagPath, err := pathFor(manifestTagCurrentPathSpec{
-		name: ts.repository.Named().Name(),
-		tag:  tag,
-	})
-
-	if err != nil {
-		return false, err
-	}
-
-	exists, err := exists(ctx, ts.blobStore.driver, tagPath)
-	if err != nil {
-		return false, err
-	}
-
-	return exists, nil
-}
-
 // Tag tags the digest with the given tag, updating the the store to point at
 // the current tag. The digest must point to a manifest.
 func (ts *tagStore) Tag(ctx context.Context, tag string, desc distribution.Descriptor) error {

registry/storage/util.go

-package storage
-
-import (
-	"context"
-
-	"github.com/docker/distribution/registry/storage/driver"
-)
-
-// Exists provides a utility method to test whether or not a path exists in
-// the given driver.
-func exists(ctx context.Context, drv driver.StorageDriver, path string) (bool, error) {
-	if _, err := drv.Stat(ctx, path); err != nil {
-		switch err := err.(type) {
-		case driver.PathNotFoundError:
-			return false, nil
-		default:
-			return false, err
-		}
-	}
-
-	return true, nil
-}