1{
  2  config,
  3  hostname,
  4  inputs,
  5  lib,
  6  outputs,
  7  ...
  8}:
  9{
 10  imports = [
 11    (./. + "/${hostname}/system.nix")
 12
 13    # ./common/base
 14  ];
 15
 16  nixpkgs = {
 17    # NOTE: Overlays might cause infinite recursion in system-manager
 18    # Only apply them for NixOS systems
 19    overlays = lib.optionals (!(config.system-manager.allowAnyDistro or false)) [
 20      # Our own flake exports (from overlays and pkgs dir)
 21      outputs.overlays.additions
 22      outputs.overlays.modifications
 23      outputs.overlays.unstable-packages
 24
 25      # And from other flakes
 26      inputs.emacs-overlay.overlay
 27      inputs.chapeau-rouge.overlays.openshift
 28      inputs.chick-group.overlays.default
 29      inputs.agenix.overlays.default
 30
 31      # Migrate to "modifications"
 32      (_: prev: {
 33        inherit (inputs.buildkit-tekton.packages.${prev.stdenv.hostPlatform.system}) tkn-local;
 34        inherit (inputs.dagger.packages.${prev.stdenv.hostPlatform.system}) dagger;
 35      })
 36    ];
 37    config = {
 38      allowUnfree = true;
 39    };
 40  };
 41  nix =
 42    lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
 43      # This will add each flake input as a registry
 44      # To make nix3 commands consistent with your flake
 45      # NOTE: These options only exist in NixOS, not in system-manager
 46      registry = lib.mkForce (lib.mapAttrs (_: value: { flake = value; }) inputs);
 47
 48      # This will additionally add your inputs to the system's legacy channels
 49      # Making legacy nix commands consistent as well, awesome!
 50      nixPath = lib.mkForce (
 51        lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry
 52      );
 53    }
 54    // lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
 55      # NOTE: optimise only exists in NixOS, not in system-manager
 56      optimise = {
 57        automatic = true;
 58        dates = [
 59          "01:10"
 60          "12:10"
 61        ];
 62      };
 63    }
 64    // {
 65
 66      settings = {
 67        auto-optimise-store = true;
 68        experimental-features = [
 69          "nix-command"
 70          "flakes"
 71        ];
 72        sandbox = true;
 73        allowed-users = [
 74          "@wheel"
 75        ];
 76        trusted-users = [
 77          "root"
 78          "@wheel"
 79        ];
 80        # See https://nixos.org/manual/nix/stable/command-ref/conf-file#conf-use-xdg-base-directories
 81        use-xdg-base-directories = true;
 82
 83        # Add some "caches" (substituters)
 84        substituters = [
 85          "https://cache.nixos.org/"
 86          "https://r-ryantm.cachix.org"
 87          "https://shortbrain.cachix.org"
 88          "https://vdemeester.cachix.org"
 89          "https://chapeau-rouge.cachix.org"
 90        ];
 91        trusted-public-keys = [
 92          "r-ryantm.cachix.org-1:gkUbLkouDAyvBdpBX0JOdIiD2/DP1ldF3Z3Y6Gqcc4c="
 93          "shortbrain.cachix.org-1:dqXcXzM0yXs3eo9ChmMfmob93eemwNyhTx7wCR4IjeQ="
 94          "mic92.cachix.org-1:gi8IhgiT3CYZnJsaW7fxznzTkMUOn1RY4GmXdT/nXYQ="
 95          "chapeau-rouge.cachix.org-1:r34IG766Ez4Eeanr7Zx+egzXLE2Zgvc+XRspYZPDAn8="
 96          "vdemeester.cachix.org-1:eZWNOrLR9A9szeMahn9ENaoT9DB3WgOos8va+d2CU44="
 97        ];
 98      };
 99
100      extraOptions = ''
101        connect-timeout = 20
102        build-cores = 0
103        keep-outputs = true
104        keep-derivations = true
105        builders-use-substitutes = true
106      '';
107    }
108    // lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
109      # On laptops at least, make the daemon and builders low priority
110      # to have a responding system while building
111      # NOTE: These options only exist in NixOS, not in system-manager
112      daemonIOSchedClass = "idle";
113      daemonCPUSchedPolicy = "idle";
114    };
115}