Update Dockerfile

Dockerfile

@@ -28,17 +28,19 @@ RUN echo "eula=true" > eula.txt && \
 
 EXPOSE 25565
 
-# launcher script: start tunnel, wait for tcp url, print it, then run server
+# launcher
 RUN printf '%s\n' \
   '#!/bin/sh' \
   'set -e' \
-  'cloudflared tunnel --url tcp://localhost:25565 --no-autoupdate --logfile /tmp/cf.log --logformat json &' \
+  'touch /tmp/cf.log' \
+  'cloudflared tunnel --url tcp://localhost:25565 --no-autoupdate > /tmp/cf.log 2>&1 &' \
   'echo "waiting for cloudflared…"' \
-  'while true; do' \
+  'for i in $(seq 1 60); do' \
   '  MC_URL=$(grep -o "tcp://[A-Za-z0-9._-]*trycloudflare.com:[0-9]*" /tmp/cf.log | head -n1)' \
   '  [ -n "$MC_URL" ] && break' \
   '  sleep 1' \
   'done' \
+  '[ -z "$MC_URL" ] && { echo "cloudflared failed"; cat /tmp/cf.log; exit 1; }' \
   'echo "minecraft public endpoint: $MC_URL"' \
   'exec java -Xmx2G -Xms2G -jar /minecraft/server.jar --nogui' \
   > /start.sh && chmod +x /start.sh