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NixOS

About

This directory contains configuration for the NixOS system environment.

This document focuses on aspects that are unique to this dotfiles. Detailed usage instructions for NixOS itself can be found in the official docs.

Layout

Directory Contents
profiles Contains profiles
machines Contains configuration for each host

A profile refers to a NixOS module targeting a specific use case.

The configuration for NixOS is chosen based on the hostname unless a specific one is chosen via the command line. Configuration for each host are defined in machines, so make sure to add hosts as necessary.

How to add configuration for new hosts

Add them to this file. Here's an example of how this might look like for a host named pod042:

pod042 = mkNixOS {
  modules = [{
    dotfiles.profiles = {
      laptop.enable = true;
      interactive.username = "yorha2b";
    };

    users.mutableUsers = false;

    # NOTE: Maybe use https://github.com/ryantm/agenix
    users.users.yorha2b.passwordFile = "/run/secrets/hashed-login-password";

    system.stateVersion = "21.11";
  }];
};

mkNixOS is a wrapper for nixosSystem that bundles custom NixOS modules in this dotfiles repository.

There's also an importNixOS function that allows you to split out the configuration into a separate file. To use this, replace mkNixOS with the below:

pod042 = importNixOS ./pod042.nix { };

Then move the configuration into pod042.nix:

{
  dotfiles.profiles = {
    laptop.enable = true;
    interactive.username = "yorha2b";
  };

  users.mutableUsers = false;

  # NOTE: Maybe use https://github.com/ryantm/agenix
  users.users.yorha2b.passwordFile = "/run/secrets/hashed-login-password";

  system.stateVersion = "21.11";
}

Finally, it's also possible to place host configuration in a separate repository by creating a new Nix flake that takes this repository as input. See the description in the templates directory for more details.

How to test the current configuration for a specific host

It's possible to try out the current configuration in a test VM. For example, to run the ci machine in a VM, run the following command:

nixos-rebuild build-vm --flake '.#ci'
result/bin/run-nixos-vm

To clean up afterwards:

rm result nixos.qcow2

Custom Options

This dotfiles introduces a few additional options for NixOS. Here's some of the interesting ones:

dotfiles.profiles.desktop.enable
Configures a desktop environment.
dotfiles.profiles.desktop.desktop
Choose a desktop environment to use. Currently available options are Gnome and KDE.
dotfiles.profiles.hardware.enable
Configuration for bare metal.
dotfiles.profiles.hardware.hidpi.enable
Configuration for HiDPI displays.
dotfiles.profiles.laptop.enable
Configuration for laptops.
dotfiles.profiles.network.enable
Network related configuration.