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

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

main()
{
    local IPV4_DNS CON_NAME

    #  Defaults for options
    VERBOSELEVEL=2

    #  Process options
    while [ $# -ge 1 ]; do
        case $1 in
            -d)              VERBOSELEVEL=$2; shift ;;
            --debug=*)       VERBOSELEVEL=${1#*=} ;;
            --file=*)        OPT_FILE=${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 1 ] || usage
    while [ $# -ge 1 ]; do
        case $1 in
            ipv4.dns) IPV4_DNS=$2; shift ;;
            con-name) CON_NAME=$2; shift ;;
            *)   error "$1: unhandled nmcli keyword" ;;
        esac
        shift
    done

    #  Sanity checks and derivations
    for VAR in CON_NAME IPV4_DNS; do
        eval "[ \"X\$$VAR\" != X ]" || error "$VAR: not set"
    done

    #  Clean

    #  Configure
    nmcli con mod "$CON_NAME" +ipv4.dns "$IPV4_DNS"
}

usage() { echo "Usage: $PROGNAME [ --file=<file> ] con-name@<connection-name>@ipv4.dns@<nameserver-ip>" >&2; exit 1; }

main "$@"