return 1;
        }
        pos = -pos - 1;
-       if (replace_object_alloc <= ++replace_object_nr) {
-               replace_object_alloc = alloc_nr(replace_object_alloc);
-               replace_object = xrealloc(replace_object,
-                                         sizeof(*replace_object) *
-                                         replace_object_alloc);
-       }
+       ALLOC_GROW(replace_object, replace_object_nr + 1, replace_object_alloc);
+       replace_object_nr++;
        if (pos < replace_object_nr)
                memmove(replace_object + pos + 1,
                        replace_object + pos,
 }
 
 static int register_replace_ref(const char *refname,
-                               const unsigned char *sha1,
+                               const struct object_id *oid,
                                int flag, void *cb_data)
 {
        /* Get sha1 from refname */
        }
 
        /* Copy sha1 from the read ref */
-       hashcpy(repl_obj->replacement, sha1);
+       hashcpy(repl_obj->replacement, oid->hash);
 
        /* Register new object */
        if (register_replace_object(repl_obj, 1))