#! /bin/sh

set -e

# Prepare to move a conffile without triggering a dpkg question
prep_mv_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"

    [ -e "$CONFFILE" ] || return 0

    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(dpkg-query -W -f='${Conffiles}' $PKGNAME | \
            sed -n -e "\' $CONFFILE ' { s/ obsolete$//; s/.* //; p }")"
    if [ "$md5sum" = "$old_md5sum" ]; then
        rm -f "$CONFFILE"
    fi
}

# Remove a no-longer used conffile
rm_conffile() {
    local PKGNAME="$1"
    local CONFFILE="$2"

    [ -e "$CONFFILE" ] || return 0

    local md5sum="$(md5sum $CONFFILE | sed -e 's/ .*//')"
    local old_md5sum="$(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
}

case "$1" in
	upgrade)
		version=$2
		if dpkg --compare-versions "$2" lt 2.2.6-1; then
			prep_mv_conffile sarg "/etc/squid/sarg.conf"
			prep_mv_conffile sarg "/etc/squid/sarg.exclude_codes"
			prep_mv_conffile sarg "/etc/squid/sarg.hosts"
			prep_mv_conffile sarg "/etc/squid/sarg-reports.conf"
			prep_mv_conffile sarg "/etc/squid/sarg.users"
			prep_mv_conffile sarg "/etc/squid/sarg.usertab"
			prep_mv_conffile sarg "/etc/squid/user_limit_block"

			rm_conffile sarg "/etc/squid/fonts/DejaVuSans.ttf"
			rm_conffile sarg "/etc/squid/fonts/FreeSans.ttf"

			if test -d /etc/squid/languages; then
				rm -rf /etc/squid/languages 
			fi

			if test -d /etc/squid/images; then
				mv /etc/squid/images /usr/share/sarg
			fi

			if test -d /var/www/squid-reports; then
				if test -d /var/lib/sarg ; then
					mv /var/www/squid-reports/* /var/lib/sarg || true
					rmdir /var/www/squid-reports
				else
					mv /var/www/squid-reports /var/lib/sarg || true
				fi
			fi
		fi
		;;
esac