#!/bin/bash
#  $HeadURL$ $LastChangedRevision$
set -e
PROGNAME=$(basename $0)

#  Load support functions
. $(pcms-config PCMS_SHARE_PREFIX)/scripts/support.sh

main()
{
    #  Defaults for options
    VERBOSELEVEL=2

    debug 10 "main: sof"

    #  Process options
    while [ $# -ge 1 ]; do
        case $1 in
            -d)              VERBOSELEVEL=$2; shift ;;
            --debug=*)       VERBOSELEVEL=${1#*=} ;;
            -v|--verbose)    VERBOSELEVEL=3 ;;
            --)              shift; break ;;
            -*)              error "main: $1: bad option" ;;
            *)               break ;;
        esac
        shift
    done

    #  Process arguments
    [ $# = 1 ] || usage
    eval set -- $(encode --decode "$1")
    [ $# -ge 2 ] || usage
    LOGIN="$1"
    shift
    unset GROUPS    #  GROUPS is a bash builtin until unassigned
    GROUPS="$@"
    echo "LOGIN=$LOGIN, GROUPS=$GROUPS"

    #  Sanity checks and derivations
    id $LOGIN > /dev/null 2>&1 || error "$LOGIN: no such login"
    for GROUP in $GROUPS; do
         getent group $GROUP > /dev/null 2>&1 || error "$GROUP: no such group"
    done
    
    #  Guts
    usermod -a -G ${GROUPS// /,} $LOGIN
}

usage() { echo "Usage: $PROGNAME <login>@<group>[@<group>...]" >&2; exit 1; }

main "$@"