* actual communication so far depends on whether a daemon
* is involved. */
write_int(batch_fd, protocol_version);
- if (protocol_version >= 30) {
- int sub = protocol_version == PROTOCOL_VERSION
- ? SUBPROTOCOL_VERSION : 0;
- write_varint(batch_fd, sub);
- }
write_int(batch_fd, checksum_seed);
if (am_sender)