#!/bin/sh
#----------------------------------------------------------------------------
# add-group - add a group
#
# Creation:     2001-11-04  fm
# Last Update:  $Id$
#
# Copyright (c) 2001-@@YEAR@@ the eisfair team, team(at)eisfair(dot)org
#
# usage: add-group
#    or: add-group group gid
#
# 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

#debug=true

if ${debug:-false}
then
    exec 2>/tmp/$(basename ${0})-trace$$.log
    set -x
    ask_debug=true
    export ask_debug
fi

ASK=/var/install/bin/ask
MKTEMP=/usr/bin/mktemp
RM=/usr/bin/rm
EXPR=/usr/bin/expr
GROUPADD=/usr/sbin/groupadd
GETENT=/usr/bin/getent

#----------------------------------------------------------------------------
# usage
#----------------------------------------------------------------------------
usage()
{
cat  <<EOF

 Usage:
 ${0}
                              empty for interactive mode

 Example: ${0} group gid
 Example: ${0}

EOF
}

#----------------------------------------------------------------------------
# do exit
#----------------------------------------------------------------------------
do_exit()
{
    if "${interactive:-false}"
    then
        mecho
        anykey
    fi
    exit $1
}

#----------------------------------------------------------------------------
# myecho, do output to tty
#----------------------------------------------------------------------------
myecho()
{
    if ${interactive:-false}
    then
        mecho ${1} "${2}"
    else
        mecho "${2}" >&2
    fi
}

#----------------------------------------------------------------------------
# add group
#----------------------------------------------------------------------------
add_group()
{
    group="${1}"
    gid="${2}"

    if "${interactive}"
    then
        clrhome
        mecho --info "Add group"
        mecho
    fi

    if [ -z "${gid}" ]
    then
        oldifs=${IFS}
        gid=200
        while read line
        do
            IFS=':'
            set -- ${line}
            if [ ${3} -gt ${gid} -a ${3} -lt 300 ]
            then
                gid=${3}
            fi
            IFS="${oldifs}"
        done </etc/group

        gid=$(${EXPR} $gid + 1)
    fi

    if [ -z "${group}" ]
    then
        _ask_tmpfile=$(${MKTEMP} -t .XXXXXXXXXXXXX)
        ${ASK} "Group (max. 32 characters, e.g. 'www'): " '' '*' > ${_ask_tmpfile}
        rc=${?}
        read group < ${_ask_tmpfile}
        ${RM} -f ${_ask_tmpfile}
        if [ ${rc} = 255 ]
        then
            exit 1
        fi
    fi

    if [ -z "${group}" ]
    then
        mecho
        myecho --warn "No group added"
        do_exit 1
    fi

    if [ "${#group}" -gt 32 ]
    then
        mecho
        myecho --warn "Name of group is too long"
        do_exit 1
    fi

    if ${GETENT} group "${group}" >/dev/null
    then
        mecho
        myecho --warn "Group '${group}' already exists"
        do_exit 1
    fi

    ${GROUPADD} -g "${gid}" "${group}"
}

#----------------------------------------------------------------------------
# main
#----------------------------------------------------------------------------
main()
{
    group=''
    gid=''
    interactive=false

    case ${#} in
    0)
        interactive=true
        ;;
    1)
        group="${1}"
        ;;
    2)
        group="${1}"
        gid="${2}"
        ;;
    *)
        usage
        exit 1
        ;;
    esac

    add_group ${group} ${gid}
}

#----------------------------------------------------------------------------
# call function main
#----------------------------------------------------------------------------
main "${@}"

#----------------------------------------------------------------------------
# end
#----------------------------------------------------------------------------