1{
  2  config,
  3  desktop,
  4  hostname,
  5  inputs,
  6  lib,
  7  outputs,
  8  stateVersion,
  9  ...
 10}:
 11{
 12
 13  imports = [
 14    (./. + "/${hostname}/boot.nix")
 15    (./. + "/${hostname}/hardware.nix")
 16
 17    ./common/base
 18    ./common/users
 19  ]
 20  ++ lib.optional (builtins.pathExists (./. + "/${hostname}/extra.nix")) ./${hostname}/extra.nix
 21  ++ lib.optional (builtins.isString desktop) ./common/desktop;
 22
 23  nixpkgs = {
 24    overlays = [
 25      # Our own flake exports (from overlays and pkgs dir)
 26      outputs.overlays.additions
 27      outputs.overlays.modifications
 28      outputs.overlays.unstable-packages
 29
 30      # And from other flakes
 31      inputs.emacs-overlay.overlay
 32      inputs.chapeau-rouge.overlays.openshift
 33      inputs.chick-group.overlays.default
 34      inputs.go-org-readwise.overlays.default
 35      inputs.agenix.overlays.default
 36
 37      # Migrate to "modifications"
 38      (_: prev: {
 39        inherit (inputs.buildkit-tekton.packages.${prev.stdenv.hostPlatform.system}) tkn-local;
 40        inherit (inputs.dagger.packages.${prev.stdenv.hostPlatform.system}) dagger;
 41      })
 42    ];
 43    config = {
 44      allowUnfree = true;
 45      # Workaround for https://github.com/nix-community/home-manager/issues/2942
 46      allowUnfreePredicate = _: true;
 47    };
 48  };
 49
 50  nix = {
 51    # This will add each flake input as a registry
 52    # To make nix3 commands consistent with your flake
 53    registry = lib.mkForce (lib.mapAttrs (_: value: { flake = value; }) inputs);
 54
 55    # This will additionally add your inputs to the system's legacy channels
 56    # Making legacy nix commands consistent as well, awesome!
 57    nixPath = lib.mkForce (
 58      lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry
 59    );
 60
 61    optimise = {
 62      automatic = true;
 63      dates = [
 64        "01:10"
 65        "12:10"
 66      ];
 67    };
 68
 69    settings = {
 70      auto-optimise-store = true;
 71      experimental-features = [
 72        "nix-command"
 73        "flakes"
 74      ];
 75      sandbox = true;
 76      allowed-users = [
 77        "@wheel"
 78      ];
 79      trusted-users = [
 80        "root"
 81        "@wheel"
 82      ];
 83      # See https://nixos.org/manual/nix/stable/command-ref/conf-file#conf-use-xdg-base-directories
 84      use-xdg-base-directories = true;
 85
 86      # Add some "caches" (substituters)
 87      substituters = [
 88        "https://cache.nixos.org/"
 89        "https://r-ryantm.cachix.org"
 90        "https://shortbrain.cachix.org"
 91        "https://vdemeester.cachix.org"
 92        "https://chapeau-rouge.cachix.org"
 93        "https://nixos-raspberrypi.cachix.org"
 94        # Local Harmonia binary caches
 95        "http://aomi.sbr.pm:5000" # x86_64-linux
 96        "http://aion.sbr.pm:5000" # aarch64-linux
 97      ];
 98      trusted-public-keys = [
 99        "r-ryantm.cachix.org-1:gkUbLkouDAyvBdpBX0JOdIiD2/DP1ldF3Z3Y6Gqcc4c="
100        "shortbrain.cachix.org-1:dqXcXzM0yXs3eo9ChmMfmob93eemwNyhTx7wCR4IjeQ="
101        "chapeau-rouge.cachix.org-1:r34IG766Ez4Eeanr7Zx+egzXLE2Zgvc+XRspYZPDAn8="
102        "vdemeester.cachix.org-1:eZWNOrLR9A9szeMahn9ENaoT9DB3WgOos8va+d2CU44="
103        "nixos-raspberrypi.cachix.org-1:4iMO9LXa8BqhU+Rpg6LQKiGa2lsNh/j2oiYLNOQ5sPI="
104        # Local Harmonia cache public keys
105        "cache.aomi.home-1:QjLpxXo2XgJoZRGd/u6tSoJoKmrndesKcwd5gR6sBuY="
106        "cache.aion.home-1:VIbchtAJWf8+T46viAsLaQYDhG9KUGVo+vWxH1Tlz94="
107      ];
108    };
109
110    extraOptions = ''
111      connect-timeout = 20
112      build-cores = 0
113      keep-outputs = true
114      keep-derivations = true
115      builders-use-substitutes = true
116    '';
117
118    # On laptops at least, make the daemon and builders low priority
119    # to have a responding system while building
120    daemonIOSchedClass = "idle";
121    daemonCPUSchedPolicy = "idle";
122  };
123
124  # `nix-daemon` will hit the stack limit when using `nixFlakes`.
125  systemd.services.nix-daemon.serviceConfig."LimitSTACK" = "infinity";
126
127  system = {
128    inherit stateVersion;
129  };
130
131}