itzg/docker-minecraft-server

Add support for unsup

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#3,798 opened on Dec 11, 2025

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enhancementhelp wanted

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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

Research direction
Study the existing server type implementations in the repository (e.g., FORGE, FABRIC) to understand the pattern for adding a new type. Then implement the unsup support by following the same pattern, using the unsup documentation and the Rewind Upsilon pack as reference.
Tech stack
shelldockerjava
Domain
backendinfrastructure
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
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.
Clear
Prerequisites
GitDockerShell scripting
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60