Improve image, add command wrapper

Signed-off-by: Knut Ahlers <knut@ahlers.me>

Dockerfile

@@ -1,7 +1,11 @@
 FROM debian:stretch
 
 ENV TERRARIA_VERISON=1353 \
-    DUMB_INIT_VERSION=1.2.1
+    DUMB_INIT_VERSION=1.2.1 \
+    GOSU_VERSION=1.10 \
+    TERRARIA_DOCKER_VERSION=v0.1.0 \
+    HOME=/home/gameserver \
+    SERVER=/home/gameserver/terraria
 
 RUN set -ex \
  && apt-get update \
@@ -12,22 +16,22 @@ RUN set -ex \
       unzip \
  && useradd -m gameserver \
  && mkdir /data && chown gameserver: /data \
- && curl -sSfLo /usr/local/bin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v${DUMB_INIT_VERSION}/dumb-init_${DUMB_INIT_VERSION}_amd64 \
- && chmod +x /usr/local/bin/dumb-init \
- && rm -rf /var/cache/apk/*
-
-USER gameserver
-ENV HOME /home/gameserver
-ENV SERVER $HOME/terraria
-
-RUN set -ex \
+ && curl -sSfLo /usr/local/bin/dumb-init "https://github.com/Yelp/dumb-init/releases/download/v${DUMB_INIT_VERSION}/dumb-init_${DUMB_INIT_VERSION}_amd64" \
+ && curl -sSfLo /usr/local/bin/gosu https://github.com/tianon/gosu/releases/download/${GOSU_VERSION}/gosu-amd64 \
+ && curl -sSfL "https://github.com/Luzifer/terraria-docker/releases/download/${TERRARIA_DOCKER_VERSION}/terraria-docker_linux_amd64.tar.gz" | tar -xz -C /usr/local/bin \
+ && chmod +x \
+      /usr/local/bin/dumb-init \
+      /usr/local/bin/gosu \
  && mkdir -p ${SERVER} \
- && curl -sSLo /tmp/terraria.zip http://terraria.org/server/terraria-server-${TERRARIA_VERISON}.zip && unzip -d ${SERVER} /tmp/terraria.zip \
- && ln -s ${SERVER}/terraria-server-* ${SERVER}/server \
- && rm /tmp/terraria.zip
+ && curl -sSfLo /tmp/terraria.zip "http://terraria.org/server/terraria-server-${TERRARIA_VERISON}.zip" \
+ && unzip -d ${SERVER} /tmp/terraria.zip \
+ && chown -R gameserver:gameserver ${SERVER} \
+ && rm /tmp/terraria.zip \
+ && rm -rf /var/lib/apt/lists/*
 
 COPY config.ini ${SERVER}/config.ini.default
 COPY start.sh ${SERVER}/start.sh
+COPY terraria_cmd.sh /usr/local/bin/terraria_cmd
 
 VOLUME /data
 EXPOSE 7777/udp 7777

README.md

@@ -6,13 +6,20 @@ This image contains a [Terraria](http://terraria.org/) 1.3.5.3 server with autom
 
 You can simply run the image with the default settings:
 
-```
-docker run -d -p 7777:7777 luzifer/terraria
+```console
+$ docker run -d --name=terraria -p 7777:7777 luzifer/terraria
 ```
 
 If you want the world to persist you can mount a volume into the container:
 
-```
-docker run -d -p 7777:7777 -v ~/terraria:/data luzifer/terraria
+```console
+$ docker run -d --name=terraria -p 7777:7777 -v ~/terraria:/data luzifer/terraria
 ```
 
+### Interacting with the server command line
+
+In case you want to use the [console commands](https://terraria.gamepedia.com/Server#List_of_console_commands) on the Terraria server this image has a helper for you:
+
+```console
+$ docker exec terraria terraria_cmd save
+```

config.ini

@@ -30,7 +30,7 @@ world=/data/world/Terraria.wld
 
 #Creates a new world if none is found. World size is specified by: 1(small), 2(medium), and 3(large).
 #autocreate=1
-autocreate=3
+autocreate=1
 
 #Sets the world seed when using autocreate
 #seed=AwesomeSeed

start.sh

@@ -1,8 +1,8 @@
-#!/bin/bash
+#!/usr/local/bin/dumb-init /bin/bash
 set -euxo pipefail
 
 if ! [ -e /data/config.ini ]; then
-  cp ${SERVER}/config.ini.default /data/config.ini
+	cp ${SERVER}/config.ini.default /data/config.ini
 fi
 
 SERVER_BINARY=$(find /home/gameserver -name 'TerrariaServer.bin.x86_64')
@@ -10,4 +10,9 @@ SERVER_BINARY=$(find /home/gameserver -name 'TerrariaServer.bin.x86_64')
 # FIX: The ZIP archive does not have correct permissions
 chmod +x "${SERVER_BINARY}"
 
-exec tail -f /dev/null | "${SERVER_BINARY}" -config /data/config.ini "$@"
+# Force data path to be writable
+chown -R gameserver:gameserver /data
+
+exec terraria-docker_linux_amd64 | /usr/local/bin/gosu \
+	gameserver \
+	${SERVER_BINARY} -config /data/config.ini "$@"

terraria_cmd.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+set -euo pipefail
+
+echo "$@" >/home/gameserver/terraria_cmd