some optimizations (#44)

* move to exec

this change uses the s6 death tally logic to check if it's the first
start of the service, if it's not it will delay the start of airspy_adsb

in the usual case of a normal container startup, airspy_adsb is
instantly started up with exec which frees some memory used by bash

* use stop_service from common scripts instead of exec sleep inf

* airspy_adsb binary for arm64: use newer compile

newer compile only available for arm64
slight CPU use reduction

Dockerfile

@@ -29,7 +29,7 @@ RUN set -x && \
   curl \
   --location \
   --output /tmp/airspy_adsb-linux-arm64.tgz \
-  "https://github.com/wiedehopf/airspy-conf/raw/master/buster/airspy_adsb-linux-arm64.tgz" \
+  "https://github.com/wiedehopf/airspy-conf/raw/master/bookworm/airspy_adsb-linux-arm64.tgz" \
   && \
   tar \
   xvf /tmp/airspy_adsb-linux-arm64.tgz \

rootfs/etc/s6-overlay/scripts/airspy_adsb

@@ -2,7 +2,6 @@
 #shellcheck shell=bash disable=SC1091
 
 source /scripts/common
-trap 'pkill -P $$' SIGTERM SIGINT SIGHUP SIGQUIT
 
 s6wrap=(s6wrap --quiet --prepend="$(basename "$0")" --timestamps --args)
 
@@ -143,7 +142,7 @@ if [[ -z "$AIRSPY_ADSB_ARCH" ]]; then
 
     else
         "${s6wrap[@]}" echo "ERROR: Unsupported architecture: $(uname -m)!"
-        exec sleep infinity
+        stop_service
     fi
 fi
 
@@ -153,25 +152,25 @@ AIRSPY_ADSB_BIN="/usr/local/bin/airspy_adsb.${AIRSPY_ADSB_ARCH}"
 # Ensure binary exists
 if [[ ! -x "$AIRSPY_ADSB_BIN" ]]; then
     "${s6wrap[@]}" echo "ERROR: Executable binary not found for architecture: $AIRSPY_ADSB_ARCH!"
-    exec sleep infinity
+    stop_service
 fi
 
 # Ensure binary runnable
 if ! "$AIRSPY_ADSB_BIN" -h > /dev/null 2>&1; then
     "${s6wrap[@]}" echo "ERROR: Executable $AIRSPY_ADSB_ARCH binary not supported on $(uname -m) architecture!"
-    exec sleep infinity
+    stop_service
 fi
 
 # Execute binary with arguments prepared above
 "${s6wrap[@]}" echo "Running $AIRSPY_ADSB_ARCH binary on $(uname -m) architecture."
 "${s6wrap[@]}" echo "Running: ${AIRSPY_ADSB_BIN} ${AIRSPY_ADSB_CMD[*]}"
 
 # Slow down restarts
-sleep 10 &
+# wait 30 seconds if this is not the first startup (this should only happen on crashes or a bad command line, thus this can be a long timeout)
+if [[ $(s6-svdt /run/service/airspy_adsb | wc -l) != 0 ]]; then
+    "${s6wrap[@]}" echo "delaying restart by 30 seconds"
+    sleep 30
+fi
 
 #shellcheck disable=SC2016
-"${s6wrap[@]}" "${AIRSPY_ADSB_BIN}" "${AIRSPY_ADSB_CMD[@]}" &
-
-# trap will only work properly while the shell is running / waiting, not while another program is being foreground executed
-# the first wait exits due to the signal which is trapped, the 2nd wait actually waits for collectd to exit
-wait || wait || true
+exec "${s6wrap[@]}" "${AIRSPY_ADSB_BIN}" "${AIRSPY_ADSB_CMD[@]}"

rootfs/etc/s6-overlay/scripts/nginx

@@ -4,7 +4,7 @@
 source /scripts/common
 
 if ! chk_enabled "${AIRSPY_ADSB_STATS}"; then
-    exec sleep infinity
+    stop_service
 fi
 
 exec s6wrap --quiet --prepend=nginx --timestamps --args /usr/sbin/nginx