added systemd service file

.drone.yml

@@ -1,18 +1,42 @@
 pipeline:
+ dl-cache:
+    image: repo.shimun.net/drone-plugins/davfile
+    url: https://seaf.shimun.net/seafdav/Drone/cache/
+    secrets: ["docker_username", "docker_password"]
+    file: ${DRONE_REPO_NAME}.tar.gz
+    secrets: ["dav_username", "dav_password"]
+ ex-cache:
+    image: repo.shimun.net/plugins/tar
+    dest: /drone/
+    file: ${DRONE_REPO_NAME}.tar.gz
+    quiet: true
  docker:
     image: plugins/docker
     repo: repo.shimun.net/shimun/sauerbraten
     registry: repo.shimun.net
     secrets: ["docker_username", "docker_password"]
-    storage_path: /drone/cache/docker
+    storage_path: /drone/docker
     use_cache: true
+ mk-cache:
+    image: repo.shimun.net/plugins/tar
+    dest: ${DRONE_REPO_NAME}.tar.gz
+    file: /drone/docker
+    quiet: true
+ up-cache:
+    image: repo.shimun.net/plugins/davfile
+    url: https://seaf.shimun.net/seafdav/Drone/cache/
+    upload: true
+    file: ${DRONE_REPO_NAME}.tar.gz
+    secrets: ["dav_username", "dav_password"]
+    group: fin
  docker-p:
     image: plugins/docker
     repo: repo.shimun.net/sauerbraten
     registry: repo.shimun.net
     secrets: ["docker_username", "docker_password"]
     use_cache: true
-    storage_path: /drone/cache/docker
+    storage_path: /drone/docker
     squash: true
     when:
       event: tag
+    group: fin

Dockerfile

@@ -11,8 +11,18 @@ RUN apk add --no-cache $BUILD_DEPS && cd /usr/src/sauerbraten && \
     cp /usr/src/sauerbraten/bin_unix/native_server /usr/bin/sauerbraten-server && \
     apk del --no-cache $BUILD_DEPS && rm -rf /usr/src/sauerbraten
 
+COPY entrypoint.sh /sbin/
+
+COPY src/server-init.cfg /etc/default/sauer-server.cfg
+
+RUN chmod +x /sbin/entrypoint.sh
+
 EXPOSE 28785 28786 28785/udp 28786/udp
 
-ENTRYPOINT /usr/bin/sauerbraten-server
+VOLUME /opt/sauerbraten
+
+WORKDIR /opt/sauerbraten
+
+ENTRYPOINT /sbin/entrypoint.sh
 
 CMD ["-d1", "-c18", "-g2"]

entrypoint.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ ! -e "/opt/sauerbraten/server-init.cfg" ]; then
+ cp "/etc/default/sauer-server.cfg" "/opt/sauerbraten/server-init.cfg"
+fi
+
+/usr/bin/sauerbraten-server "$@"

sauerbraten.service

@@ -0,0 +1,26 @@
+[Unit]
+Description=Sauerbraten Server container based on https://github.com/andrius4669/zeromod-sauerbraten
+
+[Service]
+Slice=machine.slice
+# Resource limits
+Delegate=true
+CPUShares=256
+MemoryLimit=128M
+
+Environment=ROOT_DIR=/srv/sauerbraten
+Environment=SAUER_PORT=4700
+Environment=SAUER_CMD="-d1 -c18 -g2"
+
+ExecStartPre=/bin/mkdir -p ${ROOT_DIR}
+ExecStart=/usr/bin/rkt --insecure-options=image run --dns 8.8.8.8 --inherit-env --volume volume-opt-sauerbraten,kind=host,source=${ROOT_DIR} \
+                       --port 28785-udp:${SAUER_PORT}5 --port 28786-udp:${SAUER_PORT}6 --port 28785-tcp:${SAUER_PORT}5 --port 28786-tcp:${SAUER_PORT}6 \
+                       docker://repo.shimun.net/sauerbraten -- ${SAUER_CMD} --- --memory=64M
+
+ExecStopPost=/usr/bin/rkt gc
+KillMode=mixed
+Restart=always
+RestartSec=30
+
+[Install]
+WantedBy=multi-user.target