PREIN

/bin/sh

getent group ow >/dev/null || groupadd -r ow
getent passwd ow >/dev/null || \
    useradd -r -g ow -d /var/empty -s /sbin/nologin \
    -c "1-wire file-system (OWFS) utilities account" ow
exit 0

PREUN

/bin/sh

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

POSTIN

/bin/sh

if [ $1 -eq 1 ] ; then 
        # Initial installation 
        /usr/bin/systemctl preset owserver.service >/dev/null 2>&1 || : 
fi

POSTUN

/bin/sh

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