Initial commit

The files were ported over from the old repository at
https://git.zom.bi/zombi-systems/dockerfiles/-/tree/master/games/forge-modbase
originally written by LOD, steffen and madmaurice.

Dockerfile

@@ -0,0 +1,37 @@
+FROM openjdk:8-jre-slim
+EXPOSE 25565
+
+ARG MINECRAFT=1.7.10
+ARG FORGE=10.13.4.1641
+
+ENV \
+    ForgeUrl1=http://files.minecraftforge.net/maven/net/minecraftforge/forge/${MINECRAFT}-${FORGE}/forge-${MINECRAFT}-${FORGE}-installer.jar \
+    ForgeUrl2=http://files.minecraftforge.net/maven/net/minecraftforge/forge/${MINECRAFT}-${FORGE}-${MINECRAFT}/forge-${MINECRAFT}-${FORGE}-${MINECRAFT}-installer.jar \
+    InstallerJar=forge-${MINECRAFT}-${FORGE}-installer.jar
+
+ENV \
+    INSTDIR=/usr/share/minecraft \
+    RUNDIR=/minecraft
+
+RUN useradd -U -d /minecraft -m forge
+
+WORKDIR $INSTDIR
+
+# Since the URL schema changed, we need to try both after another.
+# Prepare the server files and remove the installer.
+# The EULA needs to be present, so we also accept it at this point.
+# The remaining jar beginning with forge-* is the launcher (multiple names
+# possible), so we will symlink it to forge.jar for convenience.
+RUN ( wget -O ${InstallerJar} ${ForgeUrl1} || wget -O ${InstallerJar} ${ForgeUrl2} ) && \
+    echo "eula=true" > eula.txt && \
+    java -jar ./${InstallerJar} --installServer && rm -f ${InstallerJar} && \
+    ln -s "forge-${MINECRAFT}-*.jar" forge.jar || exit 2
+
+COPY entrypoint.sh /usr/bin
+
+WORKDIR $RUNDIR
+
+VOLUME ["/minecraft"]
+
+ENTRYPOINT ["/usr/bin/entrypoint.sh"]
+

entrypoint.sh

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+#!/bin/bash
+
+# rmln links dest to target, but removes the target if it already exists.
+rmln() {
+    dest=$1
+    target=$2
+
+    [ -e "$target" ] && rm -rf "$target"
+    ln -s "$dest" "$target"
+}
+
+
+rmln "$INSTDIR/forge.jar"                       "$RUNDIR/forge.jar"
+rmln "$INSTDIR/libraries"                       "$RUNDIR/libraries"
+rmln "$INSTDIR/minecraft_server.$MineVers.jar"  "$RUNDIR/minecraft_server.$MineVers.jar"
+rmln "$INSTDIR/eula.txt"                        "$RUNDIR/eula.txt"
+
+( echo "MINECRAFT=${MINECRAFT}"; echo "FORGE=${FORGE}" ) > $RUNDIR/version.info
+
+chown forge:forge "$RUNDIR"
+
+cd $RUNDIR
+
+exec su forge -c "/usr/bin/java -jar $RUNDIR/forge.jar"
+