docker-adsb-ultrafeeder/rootfs/etc/s6-overlay/scripts/prometheus-readsb

#!/command/with-contenv bash
# shellcheck shell=bash disable=SC1091

source /scripts/common

if chk_enabled "$PROMETHEUS_ENABLE"; then
    while [[ ! -f /run/readsb-prometheus.prom ]]
    do
        sleep 1
    done
    trap "pkill -P $$ || true; s6wrap --timestamps --prepend=prometheus-readsb --quiet --args echo 'service stopping'; exit 0" SIGTERM SIGINT SIGHUP SIGQUIT
    echo -e "HTTP/1.1 200 OK\nContent-Type: text/plain\n\n$(cat /run/readsb-prometheus.prom)" | ncat -l 9274 > /dev/null 2>&1 &
    wait
else
    exec sleep infinity
fi