containerd handle localhost and 127.0.0.1 registry hosts

Signed-off-by: Chris Plock <chrisplo@appdynamics.com>

pkg/image/containerd/daemon_provider.go

@@ -507,10 +507,16 @@ func withMetadata(platform *platforms.Platform, ref string) (metadata []image.Ad
 // if image doesn't have host set, add docker hub by default
 func checkRegistryHostMissing(imageName string) string {
 	parts := strings.Split(imageName, "/")
-	if len(parts) == 1 {
+	switch {
+	case len(parts) == 0:
+		return imageName
+	case len(parts) == 1:
 		return fmt.Sprintf("docker.io/library/%s", imageName)
-	} else if len(parts) > 1 && !strings.Contains(parts[0], ".") {
+	case strings.Contains(parts[0], ".") || strings.Contains(parts[0], ":"):
+		return imageName
+	case parts[0] == "localhost" || parts[0] == "127.0.0.1":
+		return imageName
+	default:
 		return fmt.Sprintf("docker.io/%s", imageName)
 	}
-	return imageName
 }

pkg/image/containerd/daemon_provider_test.go

@@ -32,6 +32,22 @@ func Test_checkRegistryHostMissing(t *testing.T) {
 			image: "registry.place.io/thing:version",
 			want:  "registry.place.io/thing:version",
 		},
+		{
+			image: "127.0.0.1/thing:version",
+			want:  "127.0.0.1/thing:version",
+		},
+		{
+			image: "127.0.0.1:1234/thing:version",
+			want:  "127.0.0.1:1234/thing:version",
+		},
+		{
+			image: "localhost/thing:version",
+			want:  "localhost/thing:version",
+		},
+		{
+			image: "localhost:1234/thing:version",
+			want:  "localhost:1234/thing:version",
+		},
 		{
 			image: "alpine@sha256:95cf004f559831017cdf4628aaf1bb30133677be8702a8c5f2994629f637a209",
 			want:  "docker.io/library/alpine@sha256:95cf004f559831017cdf4628aaf1bb30133677be8702a8c5f2994629f637a209",