static int diff_tree_commit_oid(const struct object_id *oid)
 {
-       struct commit *commit = lookup_commit_reference(oid);
+       struct commit *commit = lookup_commit_reference(the_repository, oid);
        if (!commit)
                return -1;
        return log_tree_commit(&log_tree_opt, commit);
 
        /* Graft the fake parents locally to the commit */
        while (isspace(*p++) && !parse_oid_hex(p, &oid, &p)) {
-               struct commit *parent = lookup_commit(&oid);
+               struct commit *parent = lookup_commit(the_repository, &oid);
                if (!pptr) {
                        /* Free the real parent list */
                        free_commit_list(commit->parents);
        struct tree *tree2;
        if (!isspace(*p++) || parse_oid_hex(p, &oid, &p) || *p)
                return error("Need exactly two trees, separated by a space");
-       tree2 = lookup_tree(&oid);
+       tree2 = lookup_tree(the_repository, &oid);
        if (!tree2 || parse_tree(tree2))
                return -1;
        printf("%s %s\n", oid_to_hex(&tree1->object.oid),