types/model: fix name for hostport

types/model/name.go

@@ -143,7 +143,11 @@ func ParseNameBare(s string) Name {
 		n.RawDigest = MissingPart
 	}
 
+	// "/" is an illegal tag character, so we can use it to split the host
+	if strings.LastIndex(s, ":") > strings.LastIndex(s, "/") {
 		s, n.Tag, _ = cutPromised(s, ":")
+	}
+
 	s, n.Model, promised = cutPromised(s, "/")
 	if !promised {
 		n.Model = s

types/model/name_test.go

@@ -34,6 +34,14 @@ func TestParseNameParts(t *testing.T) {
 				Model:     "model",
 			},
 		},
+		{
+			in: "host:12345/namespace/model",
+			want: Name{
+				Host:      "host:12345",
+				Namespace: "namespace",
+				Model:     "model",
+			},
+		},
 		{
 			in: "namespace/model",
 			want: Name{