System/modules/linux/default.nix

{ config, lib, pkgs, ... }:
let
  inherit (import ../lib.nix {
    inherit lib;
    inherit pkgs;
  })
    nLib;
in {
  imports = [
    ../options.nix
    ./base.nix
    ./user.nix
    ./desktop.nix
    ./swaywm.nix
    ./hardware.nix
    ./virtualization.nix
    ./windows.nix
    ./programs/games.nix
    ./programs/gpg.nix
    ./programs/utils.nix
    ./services/ssh.nix
    ./services/tailscale.nix
    ./services/borg.nix
    ./services/nginx.nix
    ./services/matrix.nix
    ./services/ipfs.nix
    ./services/resolved.nix
    ./services/postgresql.nix
  ];

  options = with lib;
    with nLib; {
      nathan = {
        # Control enabling of services
        # Services are system specific so they go here
        services = {
          # Enable resolved
          resolved = {
            enable = mkEnableOption "resolved";
            nameserver = mkOption { default = "10.0.0.10"; };
            domains = mkOption {
              default = [ "mccarty.io" "stranger.systems" "local" ];
            };
          };
          # Use zramSwap, enabled by default
          zramSwap = mkDefaultOption "zram memory compression"
            config.nathan.config.isDesktop;
          # Enable ssh and configure firewall
          # On by default
          ssh = mkEnableOptionT "ssh";
          # Enable tailscale, on by default on linux
          tailscale = {
            enable = mkDefaultOption "tailscale" pkgs.stdenv.isLinux;
          };
          # Borg backup
          # Disabled by default as it requires configuration, but a really good idea to turn on
          borg = {
            enable = mkEnableOption "borg";
            extraExcludes = mkOption {
              default = [ ];
              description = "List of extra paths to exclude";
            };
            extraIncludes = mkOption {
              default = [ ];
              description = "List of extra paths to include";
            };
            location = mkOption {
              default = "de1955@de1955.rsync.net:computers";
              description = "Location to backup to";
              type = lib.types.str;
            };
            passwordFile = mkOption {
              description = "Path to the password file";
              type = lib.types.str;
            };
            sshKey = mkOption {
              description = "Path to the ssh key";
              type = lib.types.str;
            };
            startAt = mkOption {
              description = "How often to run backups";
              default = "hourly";
            };
          };
          # Nginx
          nginx = {
            enable = mkEnableOption "nginx";
            acme = mkEnableOption "ACME Integration";
          };
          postgresql = {
            enable = mkEnableOption "postgresql";
            backup = mkEnableOption "postgresqlbackup";
          };
          # Matrix
          matrix = {
            enable = mkEnableOption "matrix";
            baseDomain = mkOption {
              description = "Base domain to use for the matrix services";
              example = "mccarty.io";
              type = lib.types.str;
            };
            element =
              mkDefaultOption "element" config.nathan.services.matrix.enable;
            enableRegistration = mkEnableOption "synapse registration";
          };
          # Kubo
          kubo = { enable = mkEnableOption "kubo"; };
        };
        # Linux (desktop/server, not android) specific programs
        programs = {
          # Install games
          games = mkEnableOption "games";
          # Install gpg with yubikey support
          # Enabled by default if the system is a desktop
          gpg = mkDefaultOption "gpg" config.nathan.config.isDesktop;
          utils = {
            # Enable multi system emulation
            # Enabled by default on desktop
            binfmt = mkDefaultOption "binfmt" config.nathan.config.isDesktop;
          };
        };
        # Control enabling of hardware support
        hardware = {
          # Logitech hardware support
          # On by default if the system is a desktop
          logitech = mkDefaultOption "logitech" config.nathan.config.isDesktop;
          # AMD Single gpu passthrough
          amdPassthrough = mkEnableOption "logitech";
          # Printing setup
          printing = mkEnableOption "printing";
        };
        # Linux specific configuration
        config = {
          # Wether or not to install the main user
          installUser = mkOption {
            default = pkgs.stdenv.isLinux;
            example = true;
            description = "Whether to install the 'nathan' user";
            type = lib.types.bool;
          };
          homeTmpfs = mkEnableOptionT "~/.tmp as tmpfs";
          userUid = mkOption {
            default = "1000";
            example = "1000";
            description = "UID of the user";
          };
          # Should we harden this system?
          # On by default
          harden = mkEnableOptionT "Apply system hardening";
          # Enable audio subsystem
          # On by default if the system is a desktop
          audio = mkDefaultOption "audio" config.nathan.config.isDesktop;
          # Basic grub configuration
          # Off by default
          setupGrub = mkEnableOption "Setup grub";
          # Install fonts
          # On by default if the system is a desktop
          fonts = mkDefaultOption "fonts" config.nathan.config.isDesktop;
          # Enable unfree software
          # On by default
          enableUnfree = mkEnableOptionT "unfree software";
          # Nix configuration
          nix = {
            # Automatic GC and optimization of the nix store
            # On by default
            autoGC = mkEnableOptionT "Nix store optimization and auto gc";
            # Automatic updating of the system
            # On by default
            autoUpdate = mkEnableOptionT "Nix autoupdating";
          };
          # Swaywm configuration
          # On by default if the system is a desktop
          swaywm = {
            enable = mkOption {
              default = config.nathan.config.isDesktop;
              example = true;
              description = "Whether to setup swaywm";
              type = lib.types.bool;
            };
          };
          # Virtualization configuration
          # All on by default if the system is a desktop
          virtualization = {
            qemu = mkDefaultOption "qemu" config.nathan.config.isDesktop;
            docker = mkDefaultOption "docker" config.nathan.config.isDesktop;
            lxc = mkEnableOption "lxc";
            nixos =
              mkDefaultOption "nixos containers" config.nathan.config.isDesktop;
            crosvm = mkEnableOption "crosvm";
          };
          # Support for interacting with a dual booted windows system
          windows = {
            enable = mkEnableOption "Windows Integration";
            mount = {
              enable = mkDefaultOption "Mount a bitlockered windows partition"
                config.nathan.config.windows.enable;
              device = mkOption {
                description = "Device to mount";
                example = "/dev/sda2";
                type = types.str;
              };
              mountPoint = mkOption {
                description = "Location to mount the device to";
                example = "/dev/sda2";
                type = types.str;
              };
              keyFile = mkOption {
                description =
                  "File containing the recovery key for the partition";
                type = types.str;
              };
            };
          };
        };
      };
    };

  config = {
    # Enable the firewall
    networking.firewall.enable = true;
    # Enable unfree packages
    nixpkgs.config.allowUnfree = config.nathan.config.enableUnfree;
    # Work around for discord jank ugh
    nixpkgs.config.permittedInsecurePackages = [ "electron-13.6.9" ];
    # Set system state version
    system.stateVersion = "22.05";

    nix = {
      # Enable flakes
      package = pkgs.nixFlakes;
      extraOptions = ''
        experimental-features = nix-command flakes
      '';
      # Setup my binary cache
      settings = {
        substituters = [
          "https://nix-cache.mccarty.io/"
          "https://nix-community.cachix.org"
        ];
        trusted-public-keys = [
          "nathan-nix-cache:R5/0GiItBM64sNgoFC/aSWuAopOAsObLcb/mwDf335A="
          "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
        ];
      };
    };
  };
}