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      })
 35    ];
 36    config = {
 37      allowUnfree = true;
 38    };
 39  };
 40  nix =
 41    lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
 42      # This will add each flake input as a registry
 43      # To make nix3 commands consistent with your flake
 44      # NOTE: These options only exist in NixOS, not in system-manager
 45      registry = lib.mkForce (lib.mapAttrs (_: value: { flake = value; }) inputs);
 46
 47      # This will additionally add your inputs to the system's legacy channels
 48      # Making legacy nix commands consistent as well, awesome!
 49      nixPath = lib.mkForce (
 50        lib.mapAttrsToList (key: value: "${key}=${value.to.path}") config.nix.registry
 51      );
 52    }
 53    // lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
 54      # NOTE: optimise only exists in NixOS, not in system-manager
 55      optimise = {
 56        automatic = true;
 57        dates = [
 58          "01:10"
 59          "12:10"
 60        ];
 61      };
 62    }
 63    // {
 64
 65      settings = {
 66        auto-optimise-store = true;
 67        experimental-features = [
 68          "nix-command"
 69          "flakes"
 70        ];
 71        sandbox = true;
 72        allowed-users = [
 73          "@wheel"
 74        ];
 75        trusted-users = [
 76          "root"
 77          "@wheel"
 78        ];
 79        # See https://nixos.org/manual/nix/stable/command-ref/conf-file#conf-use-xdg-base-directories
 80        use-xdg-base-directories = true;
 81
 82        # Add some "caches" (substituters)
 83        substituters = [
 84          "https://cache.nixos.org/"
 85          "https://r-ryantm.cachix.org"
 86          "https://shortbrain.cachix.org"
 87          "https://vdemeester.cachix.org"
 88          "https://chapeau-rouge.cachix.org"
 89        ];
 90        trusted-public-keys = [
 91          "r-ryantm.cachix.org-1:gkUbLkouDAyvBdpBX0JOdIiD2/DP1ldF3Z3Y6Gqcc4c="
 92          "shortbrain.cachix.org-1:dqXcXzM0yXs3eo9ChmMfmob93eemwNyhTx7wCR4IjeQ="
 93          "mic92.cachix.org-1:gi8IhgiT3CYZnJsaW7fxznzTkMUOn1RY4GmXdT/nXYQ="
 94          "chapeau-rouge.cachix.org-1:r34IG766Ez4Eeanr7Zx+egzXLE2Zgvc+XRspYZPDAn8="
 95          "vdemeester.cachix.org-1:eZWNOrLR9A9szeMahn9ENaoT9DB3WgOos8va+d2CU44="
 96        ];
 97      };
 98
 99      extraOptions = ''
100        connect-timeout = 20
101        build-cores = 0
102        keep-outputs = true
103        keep-derivations = true
104        builders-use-substitutes = true
105      '';
106    }
107    // lib.optionalAttrs (!(config.system-manager.allowAnyDistro or false)) {
108      # On laptops at least, make the daemon and builders low priority
109      # to have a responding system while building
110      # NOTE: These options only exist in NixOS, not in system-manager
111      daemonIOSchedClass = "idle";
112      daemonCPUSchedPolicy = "idle";
113    };
114}