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A minimal nixos configuration example using the dendritic patter with flake-parts, flake-file and hjem. Using niri-wm and noctalia-shell

If you'd like to know more about the dendritic pattern for you nixos configuration, read doc-steve's guide, and filip-ruman's practical implementation tips. These were incredibly helpful when I started rewriting my config.

Configuration entry point and Rebuilding the system

The entry point for building the system is in modules/hosts/desktop/desktop.nix. From this file, hardware.nix is sourced and all other modules are imported To rebuild the system, use sudo nixos-rebuild switch --flake .#desktop

If you need to create a configuration for another host, you can add it in hosts/ following the same structure as desktop.nix, and build your new configuration combining any of the modules

Adding flake inputs

flake-file is used to add flake inputs from the same config file where they will be used. For example, we can see this in the zen.nix module:

{inputs, ...}: {
  flake-file.inputs.zen-browser = {
    url = "github:youwen5/zen-browser-flake";
    inputs.nixpkgs.follows = "nixpkgs";
  };
  flake.nixosModules.zen = {pkgs, ...}: {
    environment.systemPackages = [
      inputs.zen-browser.packages.${pkgs.stdenv.hostPlatform.system}.default
    ];
  };
}

After adding this, you can use flake-file to update flake.nix using nix run .#write-flake

Sourcing config files without home-manager

To source config files from other programs using nix, we use hjem. For example, this is the tmux module, where we source a tmux.conf file that is located in the same directory as tmux.nix to be available at ~/.config/tmux/tmux.conf after rebuilding the system:

{
  flake.nixosModules.tmux = {pkgs, ...}: {
    programs.tmux = {
      enable = true;
      terminal = "tmux-256color";
      baseIndex = 1;
    };

    hjem.users.eduardo = {
      files = {
        ".config/tmux/tmux.conf".source = ./tmux.conf;
      };
    };
  };
}

made with olin by eduardofuncao