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mqtt.sh: suppress orb summary's per-poll banner, keep error output #24

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mqtt.sh: suppress orb summary's per-poll banner, keep error output #24

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fa73cc3
mqtt.sh: silence orb summary's stderr banner on every poll
jamietre Jul 10, 2026
4daa967
mqtt.sh: only silence orb summary's stderr when mqtt_debug is off
jamietre Jul 10, 2026
55c0b1e
mqtt.sh: capture orb summary stderr, replay it on failure or in debug…
jamietre Jul 10, 2026
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18 changes: 16 additions & 2 deletions docker/mqtt.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -116,8 +116,22 @@ while true; do
# sleep first to avoid publishing zeroes on first iteration
sleep "$MQTT_PAUSE"

# output a single line to mosquitto_pub
(/app/orb summary || echo '{}') | jq -c .
# output a single line to mosquitto_pub. orb summary prints a startup
# banner to stderr on every invocation, which would flood the journal at
# MQTT_PAUSE cadence -- so capture stderr in a variable (fd 3 carries the
# real stdout out of the command substitution) and only replay it when
# orb fails (it's the only diagnostic we have then) or mqtt_debug is on.
{
ORB_ERRS=$(/app/orb summary 2>&1 >&3)
ORB_RC=$?
if [ "$ORB_RC" -ne 0 ]; then
echo "orb summary failed (exit $ORB_RC):" >&2
[ -n "$ORB_ERRS" ] && printf '%s\n' "$ORB_ERRS" >&2
echo '{}'
elif [ "$DEBUG_MODE" = "true" ] && [ -n "$ORB_ERRS" ]; then
printf '%s\n' "$ORB_ERRS" >&2
fi
} 3>&1 | jq -c .

done | mosquitto_pub -h "$MQTT_HOST" -p "$MQTT_PORT" -u "$MQTT_USER" -P "$MQTT_PASS" \
-t "$STATE_TOPIC" -l -r -k $((MQTT_PAUSE * 2))
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