#!/bin/sh

set -e

mode=$1

# Prepare to move a conffile without triggering a dpkg question
prep_mv_conffile() {
    PKGNAME="$1"
    CONFFILE="$2"
    
    if [ -e "$CONFFILE" ]; then
        md5sum="`md5sum \"$CONFFILE\" | sed -e \"s/ .*//\"`"
        old_md5sum="`dpkg-query -W -f='${Conffiles}' $PKGNAME | sed -n -e \"\\\\' $CONFFILE'{s/ obsolete$//;s/.* //p}\"`"
        if [ "$md5sum" = "$old_md5sum" ]; then
            rm -f "$CONFFILE"
        fi
    fi
}

case "$mode" in
  install | upgrade )
    old_version=$2
    
    if dpkg --compare-versions "$old_version" lt "0.200"; then
        pureperlfilter_link=/etc/courier/filters/active/pureperlfilter
        if [ -h $pureperlfilter_link ]; then
            echo "Disabling pureperlfilter mail filter ..."
            rm $pureperlfilter_link
            courierfilter restart
        fi
        
        prep_mv_conffile courier-filter-perl /etc/courier/filters/pureperlfilter.conf
    fi
    ;;
esac