wireguard-dkms.postinst

#!/bin/sh
set -e

#DEBHELPER#

# Message of running rmmod & modprobe need to run after the module has been build. 

case "$1" in
	install)
		;;

	configure)
		# Check if the wireguard module is loaded else the install will fail.
		if [ ! -f "/sys/module/wireguard/version" ]; then
			exit 0
		fi
		if [ ! -f "/lib/modules/$(uname -r)/updates/dkms/wireguard.ko" ]; then
			exit 0
		fi
		
		
		new="$(modinfo -F version "/lib/modules/$(uname -r)/updates/dkms/wireguard.ko" 2>/dev/null)" # Get the version of the current built module
		old="$(cat /sys/module/wireguard/version)" # Get the version of the current loaded module
		if ! [ "$old" = "$new" ]; then
			echo "You appear to have just upgraded WireGuard from version v$old to v$new."
			echo "However, the old version is still running on your system. In order to use the"
			echo "new version, you will need to remove the old module and load the new one."
			echo "You can accomplish this with the following commands:"
			echo
			echo "    # sudo rmmod wireguard"
			echo "    # sudo modprobe wireguard"
			echo
			echo "Do note that doing this will remove current WireGuard interfaces, so you may want"
			echo "to gracefully remove them yourself prior."
			echo
			if [ -f /etc/wireguard/.reload-module-on-update ]; then
				units="$(systemctl list-units --state=active --plain --no-legend 'wg-quick@*.service' 2>/dev/null|cut -d ' ' -f 1)"
				if [ -n "$units" ]; then
					for unit in $units; do
						echo "Stopping $unit..."
						systemctl stop "$unit"
					done
					echo "Sleeping 3 seconds..."
					sleep 3
					if [ -n "$(wg show interfaces)" ]; then
						echo "Warning: interfaces exist after stopping systemd units, not reloading module"
					else
						echo "Reloading module..."
						rmmod wireguard
						modprobe wireguard
					fi
					systemctl daemon-reload
					for unit in $units; do
						echo "Starting $unit..."
						systemctl start "$unit"
					done
				else
					echo "No wg-quick@.service units were found to restart."
					if [ -n "$(wg show interfaces)" ]; then
						echo "Warning: interfaces exist, not reloading module"
					else
						echo "Reloading module..."
						rmmod wireguard
						modprobe wireguard
					fi
					systemctl daemon-reload
				fi
			else
				echo "In order to have all wg-quick@.service units restarted and the new module inserted"
				echo "when a new version is installed, run \`touch /etc/wireguard/.reload-module-on-update'."
			fi
		fi 
		;;
	abort-upgrade)
		;;
	*)
		exit 0
		;;
esac


exit 0