#! /bin/sh
#----------------------------------------------------------------------------
# /var/install/bin/remove-user-from-additional-group - remove user from additional group
#
# Creation:     2003-07-20  fm
# Last Update:  $Id$
#
# Copyright (c) 2001-2007 the eisfair team, team(at)eisfair(dot)org
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#----------------------------------------------------------------------------

# include eislib
. /var/install/include/eislib

#exec 2> /tmp/remove-user$$.log
#set -x

#----------------------------------------------------------------------------
# remove user from group
#----------------------------------------------------------------------------
remove_user_from_group ()
{

if [ "${quietflag}" = "-quiet" ]
then
    user=${1}
    rg=${2}
fi

if [ "${quietflag}" = "" ]
then
    clrhome
    myecho -info "Remove user from additional group"
    mecho

    tty=`tty`
    mecho
    mecho

    /var/install/bin/ask "User:" '' '*' > /tmp/ask.$$
    rc=${?}
    user=`cat /tmp/ask.$$`
    rm -f /tmp/ask.$$
    if [ ${rc} = 255 ]
    then
        exit 1
    fi

fi


oldifs="${IFS}"

if [ "${user}" != "" ]
then
    myecho
    line=`grep "^${user}:" /etc/passwd`

    if [ "${line}" != "" ]
    then
        groups=''
        myecho "  Additional groups of user ${user}:"
        myecho
        IFS=':'
        while read line
        do
            set -- ${line}
            g="${1}"
            u="${4}"

            IFS=','
            set -- ${u}
            for j in ${*}
            do
                if [ ${j} = ${user} ]
                then
                    myecho -std "    ${g}"

                    if [ "${groups}" = "" ]
                    then
                        groups="${g}"
                    else
                        groups="${groups} "${g}
                    fi

                    break
                fi
            done
            IFS=':'
        done </etc/group
        IFS="${oldifs}"

        if [ "${groups}" != "" ]
        then

            if [ "${quietflag}" = "" ]
            then
                mecho
                /var/install/bin/ask "Remove user ${user} from group:" '' '*' > /tmp/ask.$$
                rc=${?}
                rg=`cat /tmp/ask.$$`
                rm -f /tmp/ask.$$
                if [ ${rc} = 255 ]
                then
                    exit 1
                fi
                mecho
            fi

            if [ "${rg}" != "" ]
            then
                group_found=false

                for j in ${groups}
                do
                    if [ ${rg} = ${j} ]
                    then
                        group_found=true
                        break
                    fi
                done

                if [ ${group_found} = true ]
                then
                    g=''

                    for j in ${groups}
                    do
                        if [ ${j} != ${rg} ]
                        then
                            if [ "${g}" = "" ]
                            then
                                g=${j}
                            else
                                g="${g},${j}"
                            fi
                        fi
                    done

                    /usr/sbin/usermod -G "${g}" ${user}
                else
                    myecho -warn "additional group ${rg} for user ${user} not found!"
                fi
            else
                myecho -warn "Command aborted"
            fi
        else
            myecho -warn "No additional group for ${user} found!"
        fi
    else
        myecho -warn "User ${user} does not exist!"
    fi
else
    myecho
    myecho -warn "Command aborted"
fi

if [ "${quietflag}" = "" ]
then
mecho
anykey
fi

}

myecho ()
{
    case ${quietflag} in
        -quiet)
           # nothing to do
        ;;

        *)
           mecho ${1} "${2}"
        ;;
    esac
}
#----------------------------------------------------------------------------
# main
#----------------------------------------------------------------------------

user=''
group=''
quietflag='-quiet'

usage ()
{
cat  <<EOF

 Usage:
 ${0}

        -u, --user            user to remove
        -g, --group           group to user remove from

                              or empty for interactive mode

 Example: ${0} --user mustermann --group users
 Example: ${0} -u mustermann -g users
 Example: ${0}

EOF
}

if [ ${#} -eq 0 ]
then
    quietflag=''
    remove_user_from_group
    exit 0
fi

if [ ${#} -lt 4 ]
then
    usage
    exit 1
fi

while [ ${#} -ne 0 ]
do
    case ${1} in
        -u|--user)
            user="${2}"
            shift; shift
        ;;

        -g|--group)
            group="${2}"
            shift; shift
        ;;

        *)
            usage
            exit 1
        ;;
    esac
done

remove_user_from_group ${user} ${group}

exit 0
#----------------------------------------------------------------------------
# end
#----------------------------------------------------------------------------