NixOS on rpi3

configuration.nix

{ config, pkgs, lib, ... }:
{
  # NixOS wants to enable GRUB by default
  boot.loader.grub.enable = false;
  # Enables the generation of /boot/extlinux/extlinux.conf
  boot.loader.generic-extlinux-compatible.enable = true;
 
  # !!! If your board is a Raspberry Pi 1, select this:
  # boot.kernelPackages = pkgs.linuxPackages_rpi;
  # !!! Otherwise (even if you have a Raspberry Pi 2 or 3), pick this:
  boot.kernelPackages = pkgs.linuxPackages_latest;
  
  # !!! This is only for ARMv6 / ARMv7. Don't enable this on AArch64, cache.nixos.org works there.
  # nix.binaryCaches = lib.mkForce [ "http://nixos-arm.dezgeg.me/channel" ];
  # nix.binaryCachePublicKeys = [ "nixos-arm.dezgeg.me-1:xBaUKS3n17BZPKeyxL4JfbTqECsT+ysbDJz29kLFRW0=%" ];

  # !!! Needed for the virtual console to work on the RPi 3, as the default of 16M doesn't seem to be enough.
  boot.kernelParams = ["cma=128M"];
    
  # File systems configuration for using the installer's partition layout
  fileSystems = {
    "/boot" = {
      device = "/dev/disk/by-label/NIXOS_BOOT";
      fsType = "vfat";
    };
    "/" = {
      device = "/dev/disk/by-label/NIXOS_SD";
      fsType = "ext4";
    };
  };
    
  # !!! Adding a swap file is optional, but strongly recommended!
  swapDevices = [ { device = "/swapfile"; size = 1024; } ];

  networking.hostName = "rpi";
  networking.wireless.enable = true;
  
  i18n = {
    consoleKeyMap = "us";
    defaultLocale = "en_US.UTF-8";
  };
  
  time.timeZone = "America/Chicago";

  environment.systemPackages = with pkgs; [
    wget
    binutils
    mc
    nix
    gitAndTools.gitFull
    emacs
    #firefox-bin
    #chromium
    tmux
    #haskellPackages.xmonad
    #haskellPackages.xmobar
    xfontsel
    xlsfonts
    xscreensaver
    awesome
    dmenu
    xclip
    lilyterm
  ];
  
  services.openssh.enable = true;

  services.xserver = {
    enable = true;
    layout = "us";
    
    videoDrivers = ["modesetting"];

  #  #windowManager.xmonad = {
  #  #  enable = true;
  #  #  enableContribAndExtras = true;
  #  #};
    
    windowManager.awesome = {
       enable = true;
    };

    windowManager.default = "awesome";

    displayManager = {
      slim = {
        enable = true;
        defaultUser = "alex";
      };
    };
  };

  programs.ssh.startAgent = true;

  users.extraUsers.alex = {
    isNormalUser = true;
    uid = 1000;
  };  

  system.stateVersion = "unstable";

  nixpkgs.config.allowUnfree = true;
}