Script to improve handling for dynamic Minecraft server list

- Updates list of servers monitored by exporter-minecraft
- Updates router mappings
- Produces no stdout (potentially stderr)
- Idempotent (if no change is necessary, no change is made

server/config/minecraft/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3'
 services:
   router:
     image: itzg/mc-router
-    container_name: minecraft_mc-router
+    container_name: minecraft_router
     logging:
       driver: loki
       options:

server/scripts/update_minecraft_server_list.sh

@@ -0,0 +1,30 @@
+#!/bin/bash
+# Get list of configured servers
+# One server per line, includes router
+SERVERS="$(docker-compose -f ~/homelab/server/config/minecraft/docker-compose.yml config --services)"
+
+# exporter-minecraft: Create comma-separated list for EXPORT_SERVERS
+EXPORT_SERVERS=""
+for server in $SERVERS
+do
+    if [ $server != "router" ]
+    then EXPORT_SERVERS="${EXPORT_SERVERS}${EXPORT_SERVERS:+,}$server"
+    fi
+done
+echo "EXPORT_SERVERS=\"$EXPORT_SERVERS\"" > /home/joey/homelab/server/config/monitoring/exporter-minecraft.yml
+
+# router: Create valid and correct mapping command for mc-router
+# example: command: --mapping=vanilla.jafner.net=vanilla:25565,e9.jafner.net=e9:25565,fan.jafner.net=fan:25565,vanilla2.jafner.net=vanilla2:25565,bmcp.jafner.net=bmcp:25565 --api-binding=0.0.0.0:25566
+MAPPINGS=""
+
+for server in $SERVERS
+do
+    #MAPPING="$server.jafner.net=$server:25565"
+    #echo $MAPPING
+    if [ $server != "router" ]
+    then MAPPINGS="${MAPPINGS}${MAPPINGS:+,}$server.janfer.net=$server:25565"
+    fi
+done
+
+#COMMAND="command: --mapping=$MAPPINGS --api-binding=0.0.0.0:25566"
+sed -i "s/--mapping=[^ ]\+/--mapping=$MAPPINGS/m" /home/joey/homelab/server/config/minecraft/docker-compose.yml