From f92c3ce35033a558a9c86c824a829368a472f873 Mon Sep 17 00:00:00 2001
From: Miloslav Trmač <mitr@redhat.com>
Date: Wed, 9 Jan 2019 21:42:37 +0100
Subject: Return a reference.Named from normalizedTag
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Instead of returning a string, return a native value and convert it
into the string in the caller, to make it that small bit more
common to use reference types.

Should not change behavior.

Signed-off-by: Miloslav Trmač <mitr@redhat.com>
---
 libpod/image/image.go      | 18 +++++++++---------
 libpod/image/image_test.go |  6 +++---
 2 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/libpod/image/image.go b/libpod/image/image.go
index 0b743e144..7442f1945 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -452,42 +452,42 @@ func getImageDigest(ctx context.Context, src types.ImageReference, sc *types.Sys
 	return "@" + digest.Hex(), nil
 }
 
-// normalizeTag returns the canonical version of tag for use in Image.Names()
-func normalizeTag(tag string) (string, error) {
+// normalizedTag returns the canonical version of tag for use in Image.Names()
+func normalizedTag(tag string) (reference.Named, error) {
 	decomposedTag, err := decompose(tag)
 	if err != nil {
-		return "", err
+		return nil, err
 	}
 	// If the input doesn't specify a registry, set the registry to localhost
 	var ref reference.Named
 	if !decomposedTag.hasRegistry {
 		ref, err = decomposedTag.referenceWithRegistry(DefaultLocalRegistry)
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 	} else {
 		ref, err = decomposedTag.normalizedReference()
 		if err != nil {
-			return "", err
+			return nil, err
 		}
 	}
 	// If the input does not have a tag, we need to add one (latest)
 	ref = reference.TagNameOnly(ref)
-	return ref.String(), nil
+	return ref, nil
 }
 
 // TagImage adds a tag to the given image
 func (i *Image) TagImage(tag string) error {
 	i.reloadImage()
-	tag, err := normalizeTag(tag)
+	ref, err := normalizedTag(tag)
 	if err != nil {
 		return err
 	}
 	tags := i.Names()
-	if util.StringInSlice(tag, tags) {
+	if util.StringInSlice(ref.String(), tags) {
 		return nil
 	}
-	tags = append(tags, tag)
+	tags = append(tags, ref.String())
 	if err := i.imageruntime.store.SetNames(i.ID(), tags); err != nil {
 		return err
 	}
diff --git a/libpod/image/image_test.go b/libpod/image/image_test.go
index 96148c2cd..077ae460e 100644
--- a/libpod/image/image_test.go
+++ b/libpod/image/image_test.go
@@ -257,7 +257,7 @@ func Test_stripSha256(t *testing.T) {
 	assert.Equal(t, stripSha256("sha256:a"), "a")
 }
 
-func TestNormalizeTag(t *testing.T) {
+func TestNormalizedTag(t *testing.T) {
 	const digestSuffix = "@sha256:0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
 
 	for _, c := range []struct{ input, expected string }{
@@ -270,12 +270,12 @@ func TestNormalizeTag(t *testing.T) {
 		{"ns/busybox:latest", "localhost/ns/busybox:latest"},                                             // Unqualified with a dot-less namespace
 		{"docker.io/busybox:latest", "docker.io/library/busybox:latest"},                                 // docker.io without /library/
 	} {
-		res, err := normalizeTag(c.input)
+		res, err := normalizedTag(c.input)
 		if c.expected == "" {
 			assert.Error(t, err, c.input)
 		} else {
 			assert.NoError(t, err, c.input)
-			assert.Equal(t, c.expected, res)
+			assert.Equal(t, c.expected, res.String())
 		}
 	}
 }
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