Merge pull request #17 from itzg/forge-2

Resolves #14

minecraft-server/Dockerfile

@@ -2,6 +2,7 @@ FROM itzg/ubuntu-openjdk-7
 
 MAINTAINER itzg
 
+RUN apt-get update
 RUN apt-get install -y wget libmozjs-24-bin imagemagick && apt-get clean
 RUN update-alternatives --install /usr/bin/js js /usr/bin/js24 100
 
@@ -26,4 +27,5 @@ ENV UID 1000
 ENV MOTD A Minecraft Server Powered by Docker
 ENV LEVEL world
 ENV JVM_OPTS -Xmx1024M -Xms1024M
+ENV TYPE VANILLA
 ENV VERSION LATEST

minecraft-server/README.md

@@ -73,6 +73,26 @@ or a specific version:
 
     docker run -d -e VERSION=1.7.9 ...
 
+## Running a Forge Server
+
+By default the container will run the selected "vanilla" (aka official) Minecraft server, but
+you can also choose to run the `LATEST` or a specific version of a [Forge server](http://www.minecraftforge.net/wiki/).
+Enable Forge server mode, by adding a `-e TYPE=FORGE` to your command-line, such as
+
+    $ mkdir forge
+    $ docker run -d -v $(pwd)/forge:/data -e TYPE=FORGE -e VERSION=1.7.10 \
+        -p 25565:25565 -e EULA=TRUE itzg/minecraft
+
+**NOTE**: You *must* use a host-attached volume of the container's `/data` in order
+to access the `mods` directory. [Docker 1.6 has a scheduled feature](https://github.com/docker/docker/pull/10198) to extend `docker cp` to enable
+copying files *into* a container -- until then attach the `/data` volume.
+
+If your container is running when adding mods, you'll need to restart it to pick those
+up:
+
+    docker stop $ID
+    docker start $ID
+
 ## Server configuration
 
 ### Op/Administrator Players

minecraft-server/start-minecraft.sh

@@ -15,22 +15,60 @@ if [ ! -e /data/eula.txt ]; then
   fi
 fi
 
+echo "Checking version information."
 case $VERSION in
   LATEST)
-    export VERSION=`wget -O - https://s3.amazonaws.com/Minecraft.Download/versions/versions.json | jsawk -n 'out(this.latest.release)'`
+    VANILLA_VERSION=`wget -O - https://s3.amazonaws.com/Minecraft.Download/versions/versions.json | jsawk -n 'out(this.latest.release)'`
   ;;
-
   SNAPSHOT)
-    export VERSION=`wget -O - https://s3.amazonaws.com/Minecraft.Download/versions/versions.json | jsawk -n 'out(this.latest.snapshot)'`
+    VANILLA_VERSION=`wget -O - https://s3.amazonaws.com/Minecraft.Download/versions/versions.json | jsawk -n 'out(this.latest.snapshot)'`
+  ;;
+  *)
+    VANILLA_VERSION=$VERSION
   ;;
 esac
 
 cd /data
 
-if [ ! -e minecraft_server.$VERSION.jar ]; then
-  echo "Downloading minecraft_server.$VERSION.jar ..."
-  wget -q https://s3.amazonaws.com/Minecraft.Download/versions/$VERSION/minecraft_server.$VERSION.jar
+echo "Checking minecraft / forge type information."
+case $TYPE in
+  VANILLA)
+    SERVER="minecraft_server.$VANILLA_VERSION.jar"
+
+    if [ ! -e $SERVER ]; then
+      echo "Downloading $SERVER ..."
+      wget -q https://s3.amazonaws.com/Minecraft.Download/versions/$VANILLA_VERSION/$SERVER
     fi
+  ;;
+
+  FORGE)
+    # norm := the official Minecraft version as Forge is tracking it. dropped the third part starting with 1.8
+    case $VANILLA_VERSION in
+      1.7.*)
+        echo OLDER
+        norm=$VANILLA_VERSION
+      ;;
+
+      *)
+        norm=`echo $VANILLA_VERSION | sed 's/^\([0-9]\+\.[0-9]\+\).*/\1/'`
+      ;;
+    esac
+
+    FORGE_VERSION=`wget -O - http://files.minecraftforge.net/maven/net/minecraftforge/forge/promotions_slim.json | jsawk -n "out(this.promos['$norm-latest'])"`
+
+    normForgeVersion="$norm-$FORGE_VERSION"
+    FORGE_INSTALLER="forge-$normForgeVersion-installer.jar"
+    SERVER="forge-$normForgeVersion-universal.jar"
+
+    if [ ! -e $SERVER ]; then
+      echo "Downloading $FORGE_INSTALLER ..."
+      wget -q http://files.minecraftforge.net/maven/net/minecraftforge/forge/$normForgeVersion/$FORGE_INSTALLER
+      echo "Installing $SERVER"
+      java -jar $FORGE_INSTALLER --installServer
+    fi
+  ;;
+
+esac
 
 if [ ! -e server.properties ]; then
   cp /tmp/server.properties .
@@ -85,5 +123,4 @@ if [ -n "$ICON" -a ! -e server-icon.png ]; then
   fi
 fi
 
-exec java $JVM_OPTS -jar minecraft_server.$VERSION.jar
-
+exec java $JVM_OPTS -jar $SERVER