dotfiles/hosts/nixos-laptop/default.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).
{ config
, pkgs
, inputs
, ...
}: {
  imports = [
    # Include the results of the hardware scan.
    ./hardware-configuration.nix
  ];

  # BOOT
  boot = {
    supportedFilesystems = [ "btrfs" ];
    loader = {
      grub = {
        enable = true;
        version = 2;
        device = "nodev";
        efiSupport = true;
      };
      efi.canTouchEfiVariables = true;
    };
  };

  # SERVICES
  services = {
    xserver.libinput.enable = true;
    xserver.libinput.touchpad.disableWhileTyping = true;
    printing.enable = true;
  };
  hardware.bluetooth.enable = true;

  # NETWORKING
  networking = {
    hostName = "nixos-laptop";
    networkmanager.enable = true;

    useDHCP = false;
    interfaces.wlp1s0.useDHCP = true;
    # interfaces.enp4s0f4u2.useDHCP = true;
  };

  time.timeZone = "Europe/Berlin";
  console.keyMap = "de";

  # needed for enabling hibernation
  security.protectKernelImage = false;

  # Powersaving
  services.tlp.enable = true;
  powerManagement.enable = true;

  # Hibernare on low battery
  systemd.timers.hibernate-on-low-battery = {
    wantedBy = [ "multi-user.target" ];
    timerConfig = {
      OnUnitActiveSec = "120";
      OnBootSec = "120";
    };
  };
  systemd.services.hibernate-on-low-battery =
    let
      batteryLevelSufficient =
        let
          batteryPath = "/sys/class/power_supply/BATT";
        in
        pkgs.writeShellScriptBin "battery-level-sufficient" ''
          test "$(cat ${batteryPath}/status)" != Discharging \
            || test "$(cat ${batteryPath}/capacity)" -ge 5
        '';
    in
    {
      serviceConfig.Type = "oneshot";
      onFailure = [ "hibernate.target" ];
      script = "${batteryLevelSufficient}/bin/battery-level-sufficient";
    };

  # Trackpad
  # i2c for https://github.com/mohamed-badaoui/asus-touchpad-numpad-driver
  hardware.i2c.enable = true;
  systemd.services.asus-touchpad-numpad = {
    description = "Activate Numpad inside the touchpad with top right corner switch";
    documentation = [ "https://github.com/mohamed-badaoui/asus-touchpad-numpad-driver" ];
    path = [ pkgs.i2c-tools ];
    script = ''
      cd ${inputs.asus-touchpad-numpad-driver}
      # In the last argument here you choose your layout.
      ${
        pkgs.python3.withPackages (ps: [ps.libevdev])
      }/bin/python asus_touchpad.py m433ia
    '';
    # Probably needed because it fails on boot seemingly because the driver
    # is not ready yet. Alternativly, you can use `sleep 3` or similar in the
    # `script`.
    serviceConfig = {
      RestartSec = "1s";
      Restart = "on-failure";
    };
    wantedBy = [ "multi-user.target" ];
  };

  nix = {
    distributedBuilds = true;
    buildMachines = [
      {
        hostName = "builder";
        system = "x86_64-linux";
        maxJobs = 6;
        speedFactor = 2;
        supportedFeatures = [ "nixos.test" "benchmark" "big-parallel" "kvm" ];
      }
    ];
    extraOptions = ''
      builders-use-substitutes = true
    '';
  };

  programs.ssh.extraConfig = ''
    Host builder
      Hostname 192.168.0.14
      Port 22
      User moritz

      IdentitiesOnly yes
      IdentityFile /etc/ssh/ssh_host_ed25519_key
  '';

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "22.05"; # Did you read the comment?
}