Static deltas support

https://bugzilla.gnome.org/show_bug.cgi?id=721799

src/libostree/ostree-core-private.h

@@ -96,6 +96,10 @@ char *
 _ostree_get_relative_static_delta_path (const char        *from,
                                         const char        *to);
 
+char *
+_ostree_get_relative_static_delta_detachedmeta_path (const char        *from,
+                                                     const char        *to);
+
 char *
 _ostree_get_relative_static_delta_part_path (const char        *from,
                                              const char        *to,
@@ -114,5 +118,9 @@ _ostree_loose_path_with_suffix (char              *buf,
                                 OstreeRepoMode     repo_mode,
                                 const char        *suffix);
 
+GVariant *
+_ostree_detached_metadata_append_gpg_sig (GVariant   *existing_metadata,
+                                          GBytes     *signature_bytes);
+
 G_END_DECLS