Add the following to your inputs:

stable-diffusion-webui-nix = {
  url = "github:Janrupf/stable-diffusion-webui-nix/main";
  inputs.nixpkgs.follows = "nixpkgs";
};

Then add the overlay to your system configuration:

{ 
  nixpkgs.overlays = [ stable-diffusion-webui-nix.overlays.default ];
}

Finally add the package to your packages:

environment.systemPackages = [ pkgs.stable-diffusion-webui ];

Afterwards you should have the command stable-diffusion-webui available which launches the server.

Data is by default stored in $HOME/.local/share/stable-diffusion-webui, this can be overwritten by using the --data-dir /another/path argument when starting the Web UI.

Running Stable Diffusion models requires CUDA and thus depends on packages which are by default not available in the NixOS cache. Add the cuda-maintainers Cachix as a substituter to your Nix configuration. See the NixOS Wiki for more information.

Due to the nature of python package management, this flake is quite complex.

1. update the Web UI commit hash in source/default.nix (and other sources).
2. run nix run .#stable-diffusion-webui-update-requirements requirements/requirements.json to update the requirements metadata
3. try running the Web UI using nix run . and test everything

NOTE: If you get an error that you have run out of disk space during step 2, your /tmp is too small. Either increase the tmpfs size or run the command with TMPDIR set to a different directory. Generally, if step 2 fails the temporary directory may not be deleted, you are free to rm -rf it, but it can be useful for inspecting why it failed.

This flake supports the usual mechanism of opening a development shell with a proper python environment set up already. Run nix develop to open this shell.

Please note that this shell does not come with a virtual environment. If you need to update requirements, do so as described above.