From 93d362bcc94a65e38d1410b95c6f6571be00c27a Mon Sep 17 00:00:00 2001
From: kx1t <kx1t@amsat.org>
Date: Tue, 28 Mar 2023 16:01:27 -0400
Subject: [PATCH] add readsb-prometheus data

---
 rootfs/etc/cont-finish.d/02-remove-prometheus-data |  4 ++++
 rootfs/etc/services.d/prometheus-readsb/run        | 12 ++++++++++++
 rootfs/etc/services.d/readsb/run                   |  8 ++++++++
 3 files changed, 24 insertions(+)
 create mode 100644 rootfs/etc/cont-finish.d/02-remove-prometheus-data
 create mode 100644 rootfs/etc/services.d/prometheus-readsb/run

diff --git a/rootfs/etc/cont-finish.d/02-remove-prometheus-data b/rootfs/etc/cont-finish.d/02-remove-prometheus-data
new file mode 100644
index 0000000..3def684
--- /dev/null
+++ b/rootfs/etc/cont-finish.d/02-remove-prometheus-data
@@ -0,0 +1,4 @@
+#!/usr/bin/with-contenv bash
+#shellcheck shell=bash
+
+rm -f /run/readsb-prometheus.prom || true
diff --git a/rootfs/etc/services.d/prometheus-readsb/run b/rootfs/etc/services.d/prometheus-readsb/run
new file mode 100644
index 0000000..6e0a5b7
--- /dev/null
+++ b/rootfs/etc/services.d/prometheus-readsb/run
@@ -0,0 +1,12 @@
+#!/usr/bin/with-contenv bash
+#shellcheck shell=bash
+
+if [[ -n "$PROMETHEUS_ENABLE" ]]; then
+    while [[ ! -f /run/readsb-prometheus.prom ]]
+    do
+        sleep 1
+    done
+    echo -e "HTTP/1.1 200 OK\nContent-Type: text/plain\n\n$(cat /run/readsb-prometheus.prom)" | ncat -l 9274 > /dev/null 2>&1
+else
+    sleep infinity
+fi
diff --git a/rootfs/etc/services.d/readsb/run b/rootfs/etc/services.d/readsb/run
index a30cf06..07398f8 100644
--- a/rootfs/etc/services.d/readsb/run
+++ b/rootfs/etc/services.d/readsb/run
@@ -314,6 +314,14 @@ if [[ -n "$READSB_BEAST_BAUDRATE" ]]; then
     READSB_CMD+=("--beast-baudrate=$READSB_BEAST_BAUDRATE")
 fi
 
+#####################
+# Handle --write-prom=<filepath> 
+
+if [[ -n "$PROMETHEUS_ENABLE" ]]; then 
+    READSB_CMD+=("--write-prom=/run/readsb-prometheus.prom")
+fi
+
+
 # shellcheck disable=SC2086
 if [[ -z "${LOGLEVEL}" ]] || [[ "${LOGLEVEL,,}" == "verbose" ]]; then
     "${READSB_BIN}" "${READSB_CMD[@]}" $READSB_EXTRA_ARGS 2>&1 | \