int unit_add_dependency(Unit *u, UnitDependency d, Unit *other);
int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name);
+int unit_choose_id(Unit *u, const char *name);
+
void unit_add_to_load_queue(Unit *u);
int unit_merge(Unit *u, Unit *other);