source: make-mini-image/functions

source CONFIG

ensure(){
    while [ "$#" -gt 0 ]; do
        if [ -z "${!1}" ]; then
            echo "Need ${1} defined in CONFIG, exitting.."
            exit 1
        fi
        shift 
    done
}

exists(){
    local ret=0
    while [ "$#" -gt 0 ]; do
        if [ -z "${!1}" ]; then
            ret=1
        fi
        shift 
    done
    return ${ret}
}

exitting(){

if [ "x${CLEAN_BASE}" = "x0" ]; then
    exit 0
fi

ensure BASE

if [ ! -d ./${BASE} ]; then
    popd &> /dev/null
fi
if [ -d ./${BASE} ]; then 
    if [ "${IN_RAM}" = "1" ]; then
        umount -l ./${BASE} &> /dev/null
        rmdir ./${BASE} &> /dev/null
    else
        rm -rf ./${BASE} &> /dev/null
    fi
    if [ -z "${1}" ]; then
        exit 1
    else
        echo ${1}
        exit 0
    fi
fi
}

trap exitting QUIT KILL TERM INT