fprintf(pack_pipe, "-%s\n", sha1_to_hex(commit->object.sha1));
 }
 
-static int do_rev_list(int fd, void *create_full_pack)
+static int do_rev_list(int in, int out, void *create_full_pack)
 {
        int i;
        struct rev_info revs;
 
-       pack_pipe = xfdopen(fd, "w");
+       pack_pipe = xfdopen(out, "w");
        init_revisions(&revs, NULL);
        revs.tag_objects = 1;
        revs.tree_objects = 1;
        int arg = 0;
 
        if (shallow_nr) {
+               memset(&rev_list, 0, sizeof(rev_list));
                rev_list.proc = do_rev_list;
-               rev_list.data = 0;
+               rev_list.out = -1;
                if (start_async(&rev_list))
                        die("git upload-pack: unable to fork git-rev-list");
                argv[arg++] = "pack-objects";