ResultCode publish() {
    transactionID = beginTransaction();
    foreach file f in /development/ready that is not in /server/live {
        error = move f from /development/ready to /server/live;
        if (error) {
            rollbackTransaction(transactionID);
            return ROLLED_BACK;
        }
    }

    foreach file f in /server/live that is not in /development/ready {
        error = delete f;
        if (error) {
            rollbackTransaction(transactionID);
            return ROLLED_BACK;
        }
    }

    foreach file f in /development/ready that differs from /server/live {
        error = move f from /development/ready to /server/live;
        if (error) {
            rollbackTransaction(transactionID);
            return ROLLED_BACK;
        }
    }
    commitTransaction(transactionID);
    return COMMITTED;
}