PREUN

/bin/sh

if [[ $1 -eq 0 && -n $(lsmod | grep "^xt_set ") ]]; then
    rmmod xt_set 2>/dev/null
    [[ $? -ne 0 ]] && echo Current iptables configuration requires ipsets && exit 1
fi

if [ $1 -eq 0 ] ; then 
        # Package removal, not upgrade 
        systemctl --no-reload disable --now ipset.service > /dev/null 2>&1 || : 
fi

POSTIN

/bin/sh

if [ $1 -eq 1 ] ; then 
        # Initial installation 
        systemctl --no-reload preset ipset.service >/dev/null 2>&1 || : 
fi

POSTUN

/bin/sh

if [ $1 -ge 1 ] ; then 
        # Package upgrade, not uninstall 
        systemctl try-restart ipset.service >/dev/null 2>&1 || : 
fi