generate_proxy ()  {
    X509_USER_PROXY=${X509_USER_PROXY:-/tmp/moldynsub.x509up_u$(id -u)}
    export X509_USER_PROXY

    VO_NAME=${VO_NAME:-$VONAME}
    [ -z "$VO_NAME" ] && exit_error "There is no VO specified for proxy generation."

    local gen_proxy=1
    arcproxy -I >/dev/null 2>&1
    if [ $? -eq 0 ]; then
        arcproxy -I 2>&1 | grep -qi expired || unset gen_proxy
        if [ -n "$VO_FQAN" ]; then
            arcproxy -I 2>&1 | grep -qi "$VO_FQAN" || gen_proxy=1
        fi
    fi
    if [ -n "$gen_proxy" ]; then
        echo_g "INFO: Generating proxy certificate for VO ${VO_NAME} ${VO_FQAN:+with FQAN $VO_FQAN}"
        arcproxy -S ${VO_NAME}${VO_FQAN:+:$VO_FQAN}
        [ $? -ne 0 ] && exit_error "Failed to generate proxy certificate."
    else
        echo_g "INFO: Proxy is already valid. Skipping proxy generation."
    fi
}

proxy_gen_params () {
cat <<END
###############################################################
#              PROXY GENERATION PARAMETERS                    #
###############################################################

# Define VO name for proxy-certificate generation (default is $VONAME)
#VO_NAME=moldyngrid

# Optionally define VO group/role if needed (default is general membership)
#VO_FQAN=/moldyngrid/Role=production

END
}