Function has_unreachable

upload-pack.c:755–790

}

static int has_unreachable(struct object_array *src, enum allow_uor allow_uor)
{
	struct child_process cmd = CHILD_PROCESS_INIT;
	char buf[1];
	int i;

	if (do_reachable_revlist(&cmd, src, NULL, allow_uor) < 0)
		goto error;

	/*
	 * The commits out of the rev-list are not ancestors of
	 * our ref.
	 */
	i = read_in_full(cmd.out, buf, 1);
	if (i)
		goto error;
	close(cmd.out);
	cmd.out = -1;

	/*
	 * rev-list may have died by encountering a bad commit
	 * in the history, in which case we do want to bail out
	 * even when it showed no commit.
	 */
	if (finish_command(&cmd))
		goto error;

	/* All the non-tip ones are ancestors of what we advertised */
	return 0;

error:
	if (cmd.out >= 0)
		close(cmd.out);
	child_process_clear(&cmd);
	return 1;
}

static void check_non_tip(struct upload_pack_data *data)
{