Systemd ждать, пока служба завершится перед входом в систему
[Unit]
Description=Prepare the system after installation
Before=getty@tty1.service getty@tty2.service getty@rrt3.service getty@tty4.service getty@tty5.service getty@tty6.service
[Service]
Type=oneshot
ExecStart=/usr/bin/prepare-system
[Install]
WantedBy=multi-user.target
Defiant Dragonfly