A Fabric mod allowing modpack authors to add non-overwriting override files.

[Modrinth]

OneTimeOverrides

Some override files, such as options.txt, should only be copied the first time a player plays a modpack. Otherwise, their changes would be lost every time the modpack is updated.

This mod allows modpack authors to place files in the one-time-overrides directory that will only be copied to their intended destination if the target file does not exist.

Example:

.minecraft
├── config
│   └── first_mod.toml
└── one-time-overrides
    │   └── config
    │       └── first_mod.toml  # already exists in .minecraft/config -> will not be copied
    └── options.txt  # does not exist in .minecraft -> will be copied

As it does not use any Minecraft-specific APIs, the mod should work with any version of the game. 1.18.2 and 1.19.2 were tested.

The only dependency is fabric-language-kotlin. Fabric API is not required.