Merge pull request #48777 from vvoland/c8d-inspect-duplicate-repodigests

c8d/inspect: Fix duplicate RepoDigests

daemon/containerd/image_inspect.go

@@ -13,6 +13,7 @@ import (
 	"github.com/docker/docker/api/types/backend"
 	imagetypes "github.com/docker/docker/api/types/image"
 	"github.com/docker/docker/api/types/storage"
+	"github.com/docker/docker/internal/sliceutil"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"golang.org/x/sync/semaphore"
 )
@@ -103,7 +104,7 @@ func (i *ImageService) ImageInspect(ctx context.Context, refOrID string, _ backe
 	return &imagetypes.InspectResponse{
 		ID:            img.ImageID(),
 		RepoTags:      repoTags,
-		RepoDigests:   repoDigests,
+		RepoDigests:   sliceutil.Dedup(repoDigests),
 		Parent:        img.Parent.String(),
 		Comment:       comment,
 		Created:       created,

integration/image/inspect_test.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"testing"
 
+	"github.com/docker/docker/api/types/image"
 	"github.com/docker/docker/internal/testutils/specialimage"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
@@ -34,3 +35,27 @@ func TestImageInspectEmptyTagsAndDigests(t *testing.T) {
 	assert.Check(t, is.Len(rawJson["RepoTags"], 0))
 	assert.Check(t, is.Len(rawJson["RepoDigests"], 0))
 }
+
+// Regression test for: https://github.com/moby/moby/issues/48747
+func TestImageInspectUniqueRepoDigests(t *testing.T) {
+	ctx := setupTest(t)
+
+	client := testEnv.APIClient()
+
+	before, _, err := client.ImageInspectWithRaw(ctx, "busybox")
+	assert.NilError(t, err)
+
+	for _, tag := range []string{"master", "newest"} {
+		imgName := "busybox:" + tag
+		err := client.ImageTag(ctx, "busybox", imgName)
+		assert.NilError(t, err)
+		defer func() {
+			_, _ = client.ImageRemove(ctx, imgName, image.RemoveOptions{Force: true})
+		}()
+	}
+
+	after, _, err := client.ImageInspectWithRaw(ctx, "busybox")
+	assert.NilError(t, err)
+
+	assert.Check(t, is.Len(after.RepoDigests, len(before.RepoDigests)))
+}