Modern shell #scripting is weird. :P #programming #bash #linux

#!/usr/bin/env bash

function parse_options () {
    declare -n result="$1"
    shift 1
    result['verbosity']='4'
    result['memory']='24G'
    result['volumes']=''
    result['device']='/dev/st0'
    result['write-rate']='250M'

    local opt
    local OPTARG
    while getopts 'vm:n:i:' opt
    do
        case $opt in
            v)
                result['verbosity']=6
                ;;
            m)
                result['memory']="$OPTARG"
                ;;
            n)
                result['volumes']="$OPTARG"
                ;;
            i)
                result['device']="$OPTARG"
                ;;
            r)
                result['write-rate']="$OPTARG"
                ;;
        esac
    done

    if [[ -z "${result['volumes']}" ]]; then
        echo "-i VOLUMES is required"
        exit 1
    fi
    return 0
}


declare -A CONFIG
parse_options CONFIG "$@" || exit 1

exec mbuffer \
    -v "${CONFIG['verbosity']}" \
    -m "${CONFIG['memory']}" \
    -n "${CONFIG['volumes']}" \
    -p 30 \
    -s 65536 \
    -A 'sh /usr/local/bin/tape_wait.sh' \
    -f \
    -R "${CONFIG['write-rate']}" \
    -i "${CONFIG['device']}"