itzg/docker-minecraft-server

Add support for unsup

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#3798 opened on Dec 11, 2025

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enhancementhelp wanted

Description

Enhancement Type

New server type

Describe the enhancement

unsup (Una's Simple Updater) is an extension to the packwiz format which allows upgrading of the game components and supports pre-defined variants of a pack. It fills a similar niche to packwiz, but supports more exotic game configurations.

While this jar can be run as a java agent, it is unable to perform a 'cold start' given the Docker image needs a pre-existing sever jar.

The 'flagship' pack using unsup is Rewind Upsilon (a touchup of FTB Ultimate) and a reference usage can be seen in their server files (will download a .zip).

Contributor guide

Tech stack
javashelldocker
Domain
backenddevops
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
4
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Dockershell scriptingbasic Java knowledge
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
35
Research direction
Examine how existing server types (e.g., Vanilla, Forge, Fabric) are implemented in the repository, typically in the start scripts and configuration files. Understand the unsup tool's requirements by reviewing its documentation and the Rewind Upsilon server pack. Determine where to add the new server type option and how to handle unsup's cold start limitation, possibly by pre downloading the jar or using a different entry point.