#!/bin/bash
#
# Copyright (c) 2009 Red Hat, Inc.
#
# This software is licensed to you under the GNU General Public License,
# version 2 (GPLv2). There is NO WARRANTY for this software, express or
# implied, including the implied warranties of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
# along with this software; if not, see
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
#
# Red Hat trademarks are not licensed under GPLv2. No permission is
# granted to use or replicate Red Hat trademarks that are incorporated
# in this software or its documentation.
#

#but echo here if you do not want really remove your files.
DEBUG="echo DEBUG:"

print_help () {
        cat <<HELP
usage: rpmconf [options]

options:
        -a, --all
                check configuration files of all packages
        -opackage, --owner=package
                check only configuration files of given package
        -ftype, --frontend=type
                to be done
HELP
        exit
}

function handle_rpmnew {
        CONF_FILE=$1
        OTHER_FILE=$2
        if diff $CONF_FILE $OTHER_FILE &>/dev/null; then 
                $DEBUG rm $OTHER_FILE
                return
        fi
        OPTION=0
        while [ 0$OPTION -eq 0 -o 0$OPTION -ge 3 ]; do
                cat <<ASK
Configuration file $CONF_FILE is available in new version.
Do you want to:
    [1] Keep your original file
     2  Install maintainer version of this file
     3  View differencies
ASK
                read -u 1 -p "Your choice: " OPTION
                if [ "$OPTION" = "" ]; then
                        OPTION=1
                fi 
                if [ 0$OPTION -eq 3 ]; then
                        diff -u $CONF_FILE $OTHER_FILE |less
                fi
        done
        if [ 0$OPTION -eq 1 ]; then
                $DEBUG rm $OTHER_FILE
        elif [ 0$OPTION -eq 2 ]; then 
                $DEBUG cp $OTHER_FILE $CONF_FILE
        fi
}

function handle_rpmsave {
        CONF_FILE=$1
        OTHER_FILE=$2
        if diff $CONF_FILE $OTHER_FILE &>/dev/null; then
                $DEBUG rm $OTHER_FILE
                return
        fi
        OPTION=0
        while [ 0$OPTION -eq 0 -o 0$OPTION -ge 3 ]; do
                cat <<ASK
Configuration file $CONF_FILE is available in new version and maintainer recommend upgrade.
Do you want to:
     1  Return back your original file
    [2] Keep maintainer new version of this file
     3  View differencies
ASK
                read -u 1 -p "Your choice: " OPTION
                if [ "$OPTION" = "" ]; then
                        OPTION=2
                fi
                if [ 0$OPTION -eq 3 ]; then
                        diff -u $OTHER_FILE $CONF_FILE |less
                fi
        done
        if [ 0$OPTION -eq 1 ]; then
                $DEBUG cp $OTHER_FILE $CONF_FILE
        elif [ 0$OPTION -eq 2 ]; then
                $DEBUG rm $OTHER_FILE
        fi
}

function handle_packages {
        PACKAGE=$1
        rpm -qc $PACKAGE |grep -v '(contains no files)' | \
        while read CONFFILE; do
                if [ -f $CONFFILE.rpmnew ]; then
                        handle_rpmnew $CONFFILE $CONFFILE.rpmnew
                fi
                if [ -f $CONFFILE.rpmsave ]; then
                        handle_rpmsave $CONFFILE $CONFFILE.rpmsave
                fi
        done
}

if [ $# -eq 0 ]; then
        print_help;
fi
while [ $# -ge 1 ]; do
    case $1 in
            --help | -h)  print_help;;
            -o*) PACKAGE=$(echo $1 | cut -c3-); handle_packages $PACKAGE;;
            --owner=*) PACKAGE=$(echo $1 | cut -d= -f2-); handle_packages $PACKAGE;;
            --all | -a) handle_packages -a;;
            *) echo Error: Invalid option $1
    esac
    shift
done