diff --git a/common/flatpak-image-source-private.h b/common/flatpak-image-source-private.h
index 42f1a5bb..5f9604d8 100644
--- a/common/flatpak-image-source-private.h
+++ b/common/flatpak-image-source-private.h
@@ -75,4 +75,5 @@ void flatpak_image_source_build_commit_metadata (FlatpakImageSource *self,
                                                  GVariantBuilder    *metadata_builder);
 
 GVariant *flatpak_image_source_make_fake_commit      (FlatpakImageSource *image_source);
+GVariant *flatpak_image_source_make_summary_metadata (FlatpakImageSource *self);
 #endif /* __FLATPAK_IMAGE_SOURCE_H__ */
diff --git a/common/flatpak-image-source.c b/common/flatpak-image-source.c
index ef29a976..66a19c81 100644
--- a/common/flatpak-image-source.c
+++ b/common/flatpak-image-source.c
@@ -500,3 +500,20 @@ flatpak_image_source_make_fake_commit (FlatpakImageSource *self)
                                        ostree_checksum_to_bytes_v ("0000000000000000000000000000000000000000000000000000000000000000"),
                                        ostree_checksum_to_bytes_v ("0000000000000000000000000000000000000000000000000000000000000000")));
 }
+
+GVariant *
+flatpak_image_source_make_summary_metadata (FlatpakImageSource *self)
+{
+  g_autoptr(GVariantBuilder) ref_metadata_builder = NULL;
+
+  ref_metadata_builder = g_variant_builder_new (G_VARIANT_TYPE ("a{sv}"));
+
+  if (self->repository)
+    g_variant_builder_add (ref_metadata_builder, "{sv}", "xa.oci-repository",
+                          g_variant_new_string (self->repository));
+  if (self->delta_url)
+    g_variant_builder_add (ref_metadata_builder, "{sv}", "xa.delta-url",
+                           g_variant_new_string (self->delta_url));
+
+  return g_variant_ref_sink (g_variant_builder_end (ref_metadata_builder));
+}