wireguard-dkmsのモジュールをreloadするシェルスクリプを作った

#!/bin/bash
# LICENSE: GPLv2
set -euo pipefail
echo "Loaded version: $(cat /sys/module/wireguard/version)"
echo "Installed version: $(modinfo -F version wireguard)"
if [[ $(cat /sys/module/wireguard/version) != $(modinfo -F version wireguard) ]]; then
    if [ -d /run/systemd/system ]; then
        systemctl daemon-reload || true
        units="$(systemctl list-units --state=active --plain --no-legend 'wg-quick@*.service' | awk '{print $1}')"
        if [ -n "$units" ]; then
            echo "Stopping currently active wg-quick@ unit instances..." >&2
            systemctl stop $units || true
        fi
    fi
    if [ -n "$(wg show interfaces)" ]; then
        echo "Warning: Wireguard interfaces currently configured, not reloading module" >&2
    else
        echo "Reloading wireguard module..." >&2
        if ! rmmod wireguard ; then
            echo "Warning: failed to unload wireguard module" >&2
        else
            modprobe wireguard
        fi
    fi
    if [ -d /run/systemd/system ]; then
        if [ -n "$units" ]; then
            echo "Starting previously active wg-quick@ unit instances..." >&2
            systemctl start $units || true
        fi
    fi
fi
if [[ -f /run/reboot-required.pkgs ]]; then
    if [[ wireguard-dkms = $(</run/reboot-required.pkgs) ]]; then
        rm -f /run/reboot-required*
    fi
fi