#!/bin/sh

set -e

mode=$1

# Move a conffile without triggering a dpkg question
mv_conffile() {
    OLDCONFFILE="$1"
    NEWCONFFILE="$2"

    if [ -e "$OLDCONFFILE" ]; then
        echo "Preserving user changes in $OLDCONFFILE to $NEWCONFFILE ..."
        mv -f "$NEWCONFFILE" "$NEWCONFFILE".dpkg-new
        mv -f "$OLDCONFFILE" "$NEWCONFFILE"
    fi
}

# Move a conffile to a non-conffile
mv_conffile_to_noncf() {
    OLDCONFFILE="$1"
    NEWCONFFILE="$2"

    if [ -e "$OLDCONFFILE" ]; then
        echo "Preserving user changes in $OLDCONFFILE to $NEWCONFFILE ..."
        mv -f "$OLDCONFFILE" "$NEWCONFFILE"
    fi
}

case "$mode" in
  configure )
    old_version=$2
    
    config_file=/etc/courier/filters/courier-filter-perl.conf
    
    if dpkg --compare-versions "$old_version" lt "0.200"; then
        # Preserve customized old config file, if any:
        mv_conffile_to_noncf /etc/courier/filters/pureperlfilter.conf $config_file
    fi
    
    if [ ! -e $config_file ]; then
        # No config file exists, create one:
        cp /usr/share/courier-filter-perl/courier-filter-perl.conf.bare $config_file
    fi
    
    echo "Starting courier-filter-perl mail filter ..."
    filterctl start courier-filter-perl
    ;;
esac