post_install() {
	dkms install -m douane -v ${1%%-*}
}
pre_upgrade() {
	local curver=${2%%-*}
	# $2 is unset due to a bug. Query current version using pacman as fallback
	[ -n "$curver" ] || curver=$(pacman -Qi douane-dkms | awk '/^Version/{print $3}')
	pre_remove $curver
}
post_upgrade() {
	post_install ${1%%-*}
}
pre_remove() {
	dkms remove -m douane -v ${1%%-*} --all
}