nixos-config-master/hosts/steamdeck/configuration.nix

{ config, pkgs, lib, ... }:

let
  jovianNixosRev = "f6423d86bec22c25a576b23262495c5536b0d069";
  jovianNixos = builtins.fetchTarball {
    url = "https://github.com/Jovian-Experiments/Jovian-NixOS/archive/${jovianNixosRev}.tar.gz";
    sha256 = "sha256:1frd1dfqd97idwf1rj29ab0wvyfa2nx2h3bp9hkbmfa1m802avmb";
  };

  v4l2loopback-options = {
    options = {
      exclusive_caps = 1;
      video_nr = 0;
      card_label = "Immersed Virtual Camera";
    };
  };
in
{
  imports = [
    ./hardware-configuration.nix
    (fetchTarball "https://github.com/nix-community/nixos-vscode-server/tarball/master")
    (jovianNixos + "/modules")
    ./cachix.nix
  ];

  # Basic System Configuration
  system.stateVersion = "24.05";

  # Printing Configuration
  services.printing = {
    enable = true;
    drivers = [ pkgs.hplipWithPlugin ];
  };

  services.avahi = {
    enable = true;
    nssmdns = true;
  };

  # Nix Package Manager Configuration
  nixpkgs = {
    overlays = [
      (import (jovianNixos + "/overlay.nix"))
    ];
    config.allowUnfree = true;
  };

  nix.settings = {
    experimental-features = [ "nix-command" "flakes" ];
    substituters = [ "https://cache.nixos.org" ];
    allowed-users = [ "@wheel" "jeirmeister" ];
    auto-optimise-store = true;
  };

  nix.extraOptions = ''
    trusted-users = root jeirmeister
    extra-substituters = https://nixpkgs-python.cachix.org https://devenv.cachix.org
    extra-trusted-public-keys = nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU= devenv.cachix.org-1:w1cLUi8dv3hnoSPGAuibQv+f9TZLr6cv/Hm9XgU50cw=
  '';

  # Steam Deck Configuration
  jovian = {
    hardware.has.amd.gpu = true;
    devices.steamdeck = {
      enable = true;
      enableControllerUdevRules = true;
      enableDefaultStage1Modules = true;
      enablePerfControlUdevRules = true;
      enableOsFanControl = true;
      enableSoundSupport = true;
      enableXorgRotation = true;
      enableKernelPatches = true;
      enableFwupdBiosUpdates = false;
      autoUpdate = false;
    };
    steam.enable = false;
    workarounds.ignoreMissingKernelModules = true;
  };

  # Desktop Environment and Display Configuration
  services.xserver = {
    enable = true;
    xkb.layout = "us";
    videoDrivers = [ "displaylink" "modesetting" ];
    desktopManager.plasma6 = {
      enable = true;
    };
    displayManager = {
      sddm = {
        enable = true;
        settings = {
          Wayland = {
            EnableHiDPI = true;
          };
        };
      };
      sessionCommands = ''
        ${lib.getBin pkgs.xorg.xrandr}/bin/xrandr --setprovideroutputsource 2 0
      '';
    };
  };

  # VS Code Server Configuration
  services.vscode-server = {
    enable = true;
    enableFHS = true;
  };

  programs.nix-ld = {
    enable = true;
    package = pkgs.nix-ld-rs;
  };

  # System Services Configuration
  services = {
    # Audio Configuration
    pipewire = {
      enable = true;
      alsa.enable = true;
      pulse.enable = true;
    };

    # Network Services
    openssh = {
      enable = true;
      settings = {
        PasswordAuthentication = true;
        AllowUsers = [ "jeirmeister" ];
      };
    };
    tailscale.enable = true;
  };

  # Systemd Services
  systemd.services = {
    jupiter-fan-control = {
      path = [ pkgs.dmidecode ];
      serviceConfig = lib.mkForce {
        Environment = "PYTHONUNBUFFERED=1";
        StandardOutput = "journal";
        StandardError = "journal";
        ExecStart = "${pkgs.jupiter-fan-control}/share/jupiter-fan-control/fancontrol.py --run";
        ExecStopPost = "${pkgs.jupiter-fan-control}/share/jupiter-fan-control/fancontrol.py --stop";
        OOMScoreAdjust = -1000;
        Restart = "on-failure";
      };
    };

    # Uncomment when ready to use Immersed
    # immersed-video = {
    #   description = "Load v4l2loopback module for Immersed";
    #   wantedBy = [ "multi-user.target" ];
    #   after = [ "systemd-modules-load.service" ];
    #   requires = [ "systemd-modules-load.service" ];
    #   serviceConfig = {
    #     Type = "oneshot";
    #     RemainAfterExit = true;
    #     ExecStartPre = "${pkgs.kmod}/bin/modprobe -r v4l2loopback || true";
    #     ExecStart = "${pkgs.kmod}/bin/modprobe v4l2loopback exclusive_caps=1 video_nr=0 card_label='Immersed Virtual Camera'";
    #     ExecStop = "${pkgs.kmod}/bin/rmmod v4l2loopback || true";
    #   };
    # };

    "systemd-modules-load" = {
      wantedBy = [ "multi-user.target" ];
      restartIfChanged = true;
    };
  };

  # UDev Rules
  services.udev.extraRules = ''
    # Steam Deck Fan Control
    SUBSYSTEM=="hwmon*", KERNEL=="hwmon*", ACTION=="add", RUN+="${pkgs.coreutils}/bin/chmod a+rw /sys/%p/pwm1"
    SUBSYSTEM=="hwmon*", KERNEL=="hwmon*", ACTION=="add", RUN+="${pkgs.coreutils}/bin/chmod a+rw /sys/%p/fan1_input"
  '';

  # Network Configuration
  networking = {
    hostName = "steamnix";
    networkmanager.enable = true;
  };

  # User Configuration
  users = {
    users.jeirmeister = {
      isNormalUser = true;
      description = "jeirmeister";
      group = "steamos";
      extraGroups = [
        "networkmanager"
        "users"
        "wheel"
        "input"
        "video"
        "audio"
        "render"
        "gamepad"
      ];
      packages = with pkgs; [
        tailscale
      ];
    };

    groups = {
      steamos.gid = 1000;
      gamepad = { };
      render = { };
    };
  };

  # System Programs and Packages
  programs = {
    firefox.enable = true;
  };

  environment.systemPackages = with pkgs; [
    # System Tools
    pciutils
    usbutils
    lm_sensors
    dmidecode
    binutils

    # Scanner & Printers
    epsonscan2

    # Virtual Display
    linuxPackages.v4l2loopback
    v4l-utils

    # Development Tools
    nixfmt-rfc-style
    git

    # Network Tools
    wget
    curl

    # Utilities
    tree
  ];

  # Locale and Time
  time.timeZone = "America/Los_Angeles";
  i18n = {
    defaultLocale = "en_US.UTF-8";
    extraLocaleSettings = {
      LC_ADDRESS = "en_US.UTF-8";
      LC_IDENTIFICATION = "en_US.UTF-8";
      LC_MEASUREMENT = "en_US.UTF-8";
      LC_MONETARY = "en_US.UTF-8";
      LC_NAME = "en_US.UTF-8";
      LC_NUMERIC = "en_US.UTF-8";
      LC_PAPER = "en_US.UTF-8";
      LC_TELEPHONE = "en_US.UTF-8";
      LC_TIME = "en_US.UTF-8";
    };
  };
}