Minecraft MultiMC-pack updater

Simple minecraft mod-pack updater for multimc by fetch mod data from server and compare changes

Getting started

• You have to setup Server before continue
• Download latest zip in release
• Import into multi-mc
• Follow config to custom your pack

  you don't have to ship any config and mods (it will automatically sync with server)

• Export instance

  don't include current.json if you don't ship config or mod

Config file

config.json

{
   // server host
   "server": "localhost",
   // server port
   "port": 8888,
   "config_sync": {
      // if true it will sync config from everytime that you launch game
      // better don't enable because it will reset your config every restart
      "on_launch": false,
      // if true it will only sync config when minecraft version update
      "on_mc_update": true,
      // if true it will only sync config when forge version update
      "on_forge_update": false,
      // if true it will only sync config when mod update
      "on_mod_update": false
   }
}

Note: to refresh config just single time you can remove current.json in .minecraft at instance folder

At client side

1. Run ./gradlew jar
2. Output file (fat jar) is in build/libs directory
3. Copy output file to .minecraft folder of multimc instance
4. Add pre-launch command $INST_JAVA -jar mcupdater.jar
5. Copy config.json to .minecraft folder and config server ip
6. Launch!
   • will fail to launch if it can't connect to server
   • will fail to launch if url response from server can't access
   • sometime it will continue to launch (it's feature!)
7. Export multimc instance to your friend!

At server side

Simple data response from server

server and port can be found config.json

GET "http://${server}:${port}/config.json"

should return data like this

// real response should not have comment but only for describe how it work
{
  "config": { // forge config
    "mc_version": "1.18.1", // minecraft version note: NYI
    "forge_version": "39.0.79" // forge version note: need to relaunch after update
  },
  "mods": [
    {
       // mod name (can be anything that always identical to mod after updated)
      "name": "journeymap_1.18",
      // version can be version or hash or anything that different between version
      "version": "1.18.1-5.8.0beta15",
      // if file name doesn't prefix with http it will download mod via "http://${server}:${port}/mods/${filename}"
      "file_name": "journeymap-1.18.1-5.8.0beta15.jar"
    },
    {
      "name": "jei-1.18.1",
      "version": "9.2.1.99",
      // if file name is prefix with http it will download from url directly
      "file_name": "https://media.forgecdn.net/files/3650/556/jei-1.18.1-9.4.1.99.jar"
    }
  ]
}

Goal

• Update minecraft version
• Update forge version
• Update fabric version
• Update mods

Priority fix

• Add tests
• Add comments
• Resolve mystery bug
• Remove unnecessary library