File debian.postinst of Package greylisting-spp

#!/bin/sh

cd "/etc/qmail/control"
if [ "$1" = "configure" -a `grep -c plugins/greylisting-spp smtpplugins` -eq 0 ]; then
    echo "Trying to insert plugin into /etc/qmail/control/smtpplugins..."
    if grep '^\[mail\]$' smtpplugins >/dev/null; then
	i=1
	while [ `head -$i smtpplugins | grep -c '^\[mail\]$'` -lt 1 ]; do
	    i=$(($i + 1))
	done
	head -$i smtpplugins >smtpplugins.new
	tail -n +$(($i + 1)) smtpplugins >>smtpplugins.new && \
	  mv smtpplugins.new smtpplugins
    else
	echo "[mail]" >>smtpplugins
    fi
    if grep '^\[rcpt\]$' smtpplugins >/dev/null; then
	i=1
	while [ `head -$i smtpplugins | grep -c '^\[rcpt\]$'` -lt 1 ]; do
	    i=$(($i + 1))
	done
	head -$i smtpplugins >smtpplugins.new
	echo "plugins/greylisting-spp" >>smtpplugins.new
	tail -n +$(($i + 1)) smtpplugins >>smtpplugins.new && \
	  mv smtpplugins.new smtpplugins
    else
	echo "[rcpt]" >>smtpplugins
	echo "plugins/greylisting-spp" >>smtpplugins
    fi
    echo "Don't forget to set the required environment variables"
    echo "when invoking qmail-smtpd."
    echo "And think about whitelisting some addresses, see /usr/share/doc/greylisting-spp."
fi