PREIN

/bin/sh

getent group mosquitto >/dev/null || groupadd -r mosquitto
getent passwd mosquitto >/dev/null || \
    useradd -r -g mosquitto -d /etc/mosquitto -s /sbin/nologin \
    -c "Mosquitto Broker" mosquitto
exit 0

PREUN

/bin/sh

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

POSTIN

/bin/sh

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

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 mosquitto.service >/dev/null 2>&1 || : 
fi 
/sbin/ldconfig