A script to softly reboot a Linux system with kexec

soft-reboot.sh

#!/bin/bash

if [ "$EUID" -ne 0 ]; then
        echo "This script requires root."
        sudo $0
        exit
fi

if [ "$1" == "complete" ]; then
        systemctl stop graphical.target
        killall -9 -u jvyden

        sleep 0.5
        modprobe -r nvidia_drm

        kexec -e
fi

# load kernel here, might as well do something before we switch away
kexec -l /boot/vmlinuz-linux-zen --initrd=/boot/initramfs-linux-zen.img --reuse-cmdline

# defer this to another systemd session so we don't get ourselves killed
systemd-run /usr/bin/soft-reboot complete