#!/bin/sh

set -e

# chk_conf_tag ()
#
#   Check if configuration file has CARNet package info lines.
#   return:  $RET => 0 - tagged
#                    1 - file does not exists
#                    2 - file exists, but it is not tagged
#
chk_conf_tag () {
    local conf_file
    conf_file="$1"
    RET=1

    if [ -f "$conf_file" ]; then
        if egrep -q "^## Begin - Generated by CARNet package mod-security-cn$" "$conf_file"; then
            RET=0
        else
            RET=2
        fi
    fi
}


case "$1" in
    remove|deconfigure)

        # Include CARNet functions.
        . /usr/share/carnet-tools/functions.sh

        PKG="mod-security-cn"
        A2DIR="/etc/apache2"
        CONFDIR="$A2DIR/conf.d"
        MODSECDIR="$A2DIR/mod-security"
        MODSECCONF="$MODSECDIR/mod-security-cn.conf"
        MODSECRBL="$MODSECDIR/rbl_lookup.conf"
        MODSECLNK="$CONFDIR/$(basename $MODSECCONF)"

        need_restart=0


        # Disable ModSecurity configuration.
        chk_conf_tag "$MODSECCONF"
        if [ $RET -eq 0 ]; then
            if [ -e "$MODSECLNK" ]; then
                cp_echo "CN: Disabling ModSecurity configuration."
                rm -f "$MODSECLNK"
                need_restart=1
            fi
        fi

        # Remove configuration files generated by this CARNet package.
        for file in "$MODSECCONF" "$MODSECRBL"; do
            chk_conf_tag "$file"
            if [ $RET -eq 0 ]; then
                cp_echo "CN: Removing configuration file $file"
                rm -f $file
                need_restart=1
            fi
        done

        # Restart Apache2 web server.
        if [ $need_restart -eq 1 ]; then
            if apache2ctl configtest 2>/dev/null; then
                invoke-rc.d apache2 force-reload || true
            else
                # Something is broken.
                cp_echo "CN: Your Apache2 configuration seem to be broken."
                cp_echo "CN: Please, check the service configuration!"
            fi
        fi

        # Mail root
        cp_mail "$PKG"

        echo
        ;;
    upgrade|failed-upgrade)
        ;;
    *)
        echo "prerm called with unknown argument \$1'" >&2
        exit 0
        ;;
esac

#DEBHELPER#

exit 0