63 lines
2.7 KiB
Markdown
63 lines
2.7 KiB
Markdown
# JSON patches for MultiMC instances
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This allows changing the Minecraft version in the instance without re-editing the component, and easier interoperability with other MultiMC features. More information about JSON patches can be found [on the MultiMC wiki page about them](https://github.com/MultiMC/Launcher/wiki/JSON-Patches). Here is a [MultiMC instance](https://github.com/MCPHackers/LaunchWrapper/files/11588554/LaunchWrapperMCP-MultiMC.zip) demonstrating this.
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Instructions:
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- Create a new MultiMC instance.
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- Click "Edit Instance".
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- Click "Add Empty". Enter "LaunchWrapper" for the name, and "org.mcphackers.launchwrapper" for the UUID.
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- Select the new component labeled "LaunchWrapper", and click "Edit".
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- Replace the contents of the file with something like this:
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```json
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{
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"+traits": [
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"noapplet"
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],
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"assetIndex": {
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"id": "empty",
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"sha1": "62ea787c1f800c091b98678b050453a5ae59d7bc",
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"size": 14,
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"totalSize": 0,
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"url": "https://mcphackers.github.io/assets/empty.json"
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},
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"libraries": [
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{
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"name": "org.mcphackers:launchwrapper:1.0",
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"url": "https://mcphackers.github.io/libraries/"
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},
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{
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"name": "org.ow2.asm:asm:9.2",
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"url": "https://repo1.maven.org/maven2/"
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},
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{
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"name": "org.ow2.asm:asm-tree:9.2",
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"url": "https://repo1.maven.org/maven2/"
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},
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{
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"name": "org.json:json:20230311",
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"url": "https://mcphackers.github.io/libraries/"
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},
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{
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"name": "org.mcphackers.rdi:rdi:1.0",
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"url": "https://mcphackers.github.io/libraries/"
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}
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],
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"mainClass": "org.mcphackers.launchwrapper.Launch",
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"minecraftArguments": "--username ${auth_player_name} --session ${auth_session} --gameDir ${game_directory} --assetsDir ${game_assets}",
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"requires": [
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{
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"uid": "net.minecraft"
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}
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],
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"formatVersion": 1,
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"name": "LaunchWrapper",
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"uid": "org.mcphackers.launchwrapper",
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"version": "1.0.0"
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}
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```
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The existing version-specific information about creating a MultiMC instance should apply here (`minecraftArguments` should be customised as needed, `assetIndex` and `noapplet` can be removed for Minecraft 1.6 and onwards etc). The main difference between this and the existing instructions is that the format of the `libraries` array is different for JSON patches (`url` is treated like a maven repo).
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- Save and close the document.
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This should produce an instance similar to the attached one. I also edited mmc-pack.json to set `dependencyOnly` to be true on the LaunchWrapper patch, which prevents disabling it (optional).
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