salt/docker-minecraft
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Dynamically download modpacks at runtime if so desired

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Salt 2021-04-09 16:54:45 -05:00
parent 7a6404b861
commit 8a78fd604a
3 changed files with 24 additions and 0 deletions
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1
Dockerfile
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@ -17,6 +17,7 @@ RUN apk add curl openjdk8-jre &&\
# The second stage is the actual container
FROM openjdk:8
RUN apt-get update && apt-get install rsync -y
WORKDIR /minecraft
COPY --from=build /minecraft .
CMD [ "bash", "start-server.sh" ]

9
README.md
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@ -28,6 +28,7 @@ variable|description
---|---
`JRE_XMX`|Maximum amount of heap passed to the main Minecraft process
`JRE_XMS`|Minimum heap size passed to the main Minecraft process
`FORGE_PACK_ZIP`|If provided, the URL to a zip or tar.gz file that contains the modpack that needs to be installed. Will be intelligently extracted into the server directory through the magic of `find`.
`ARGS`|Any additional arguments to be passed to the JVM
## Useful Arguments
@ -47,6 +48,14 @@ enable-command-block=true
spawn-protection=0
```
## FAQ
**Why do you download the pack at runtime?**
It allows for transparent upgrades without having to build a whole new container. You may lose container consistency, but you gain simplicity in definition.
Of course, nothing prevents you from just not using this magic variable and instead `FROM`ing this container and building your own pack.
## License
MIT

14
start-server.sh
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@ -5,6 +5,20 @@
#
# Distributed under terms of the MIT license.
#
set -e
# Download and extract a pack zip, if one is provided
if [ -n "$FORGE_PACK_ZIP" ]; then
echo "Downloading pack: $FORGE_PACK_ZIP"
tmpdir="$(mktemp -d)"
pushd "$tmpdir" > /dev/null 2>&1
curl -L "$FORGE_PACK_ZIP" -o pack.zip
unzip pack.zip
directory="$(find . -type d -iname "mods" -execdir pwd \; | sort -n | head -n 1)"
echo "Found modpack directory: $directory"
rsync -av "$directory"/ /minecraft/
popd > /dev/null 2>&1
fi
# Entrypoint will be server.jar
args="-jar server.jar nogui"