PREUN

/bin/sh

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

POSTIN

/bin/sh

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


# save today's logfile (format might be incompatible)
mv /var/log/atop/atop_`date +%Y%m%d` /var/log/atop/atop_`date +%Y%m%d`.save \
					2> /dev/null || :

# create dummy files to be rotated
touch /var/log/atop/dummy_before /var/log/atop/dummy_after

# activate daily logging for today
/etc/atop/atop.daily

POSTUN

/bin/sh

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