PREIN

/bin/sh

getent group vdradmin >/dev/null || groupadd -r vdradmin
getent passwd vdradmin >/dev/null || \
useradd -r -g vdradmin -d /var/lib/vdradmin -s /sbin/nologin \
    -c "VDR web interface" -M -n vdradmin
exit 0

PREUN

/bin/sh

[ $1 -eq 0 ] && rm -rf /var/cache/vdradmin/*

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

POSTIN

/bin/sh

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

POSTUN

/bin/sh

[ $1 -gt 0 ] && rm -rf /var/cache/vdradmin/*