#!/bin/sh -e

# remove a no-longer used conffile
rm_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
            echo "Obsolete conffile $CONFFILE has been modified by you."
            echo "Saving as $CONFFILE.dpkg-bak ..."
            mv -f "$CONFFILE" "$CONFFILE".dpkg-bak
        else
            echo "Removing obsolete conffile $CONFFILE ..." 
            rm -f "$CONFFILE"
        fi
    fi
}

case "$1" in
    install|upgrade)
        # Upgrade from previous versions
        if dpkg --compare-versions "$2" lt-nl "96"; then
            rm_conffile postgresql-common /etc/postgresql-common/autovacuum.conf
            rm_conffile postgresql-common /etc/cron.d/postgresql-common
        fi
        ;;

    abort-upgrade)
        ;;

    *)
        echo "$0 called with unknown argument \`$1'" 1>&2
        exit 1
        ;;
esac