Add proper handling of docker stop

Author: Overv

README.md

@@ -63,6 +63,8 @@ docker run \
     run
 ```
 
+**If you do this, then make sure to also run the import with the `openstreetmap-rendered-tiles` volume to make sure that caching works properly across updates!**
+
 ### Enabling automatic updating (optional)
 
 Given that you've specified both the OSM data and polygon as specified in the *Automatic updates* section during server setup, you can enable the updating process by setting the variable `UPDATES` to `enabled`:

run.sh

@@ -95,8 +95,16 @@ if [ "$1" = "run" ]; then
       /etc/init.d/cron start
     fi
 
-    # Run
-    sudo -u renderer renderd -f -c /usr/local/etc/renderd.conf
+    # Run while handling docker stop's SIGTERM
+    stop_handler() {
+        kill -TERM "$child"
+    }
+    trap stop_handler SIGTERM
+
+    sudo -u renderer renderd -f -c /usr/local/etc/renderd.conf &
+    child=$!
+    wait "$child"
+
     service postgresql stop
 
     exit 0