[Unit]
Description=FirstBoot
After=network.target
Before=rc-local.service
ConditionFileNotEmpty=/boot/firstboot.bash

[Service]
ExecStart=/boot/firstboot.bash
ExecStartPost=/bin/mv /boot/firstboot.bash /boot/firstboot.bash.done
Type=oneshot
RemainAfterExit=no

[Install]
WantedBy=multi-user.target