configuration.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, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  boot = {
    loader = {
      efi = {
        canTouchEfiVariables = true;
      };
      grub = {
        device = "/dev/sdc";
        efiSupport = true;
        enable = true;
        zfsSupport = true;
      };
    };
    supportedFilesystems = [ "zfs" ];
  };

  nixpkgs.config.allowUnfree = true;

  networking.hostName = "stick";
  networking.hostId = "a7634783";

  i18n.consoleUseXkbConfig = true;

  services.xserver = {
    layout = "us";
    xkbVariant = "dvp";
  };

  # The NixOS release to be compatible with for stateful data such as databases.
  system.stateVersion = "17.09";

}

default.nix

with import <nixpkgs> {};
{ pool ? "main"
, disk
, altroot ? "/mnt"
}:
let
  createFilesystem = ''
    set -x

    sudo sgdisk -Z -n 1::+200M -t 1:ef00 -n 2:: -g ${disk}

    zpool create -f -o ashift=12 -m legacy ${pool} ${disk}2
    mkdir -p ${altroot}
    mount -t zfs ${pool} ${altroot}
    cd ${altroot}

    mkdir boot home root var
    mkdir nix

    mkfs.vfat ${disk}1
    mount -t vfat ${disk}1 boot
    
    sudo zfs create -o compress=on ${pool}/nix
    mount -t zfs ${pool}/nix nix

    sudo zfs create -o compress=on -o snapdir=visible ${pool}/home
    mount -t zfs ${pool}/home home

    sudo zfs create -o compress=on -o snapdir=visible ${pool}/root
    mount -t zfs ${pool}/root root

    sudo zfs create -o snapdir=visible ${pool}/var
    mount -t zfs ${pool}/var var

    mkdir -p etc/nixos
  '';
in writeScript "setup" ''
  ${createFilesystem}
  cp ${./configuration.nix} etc/nixos/configuration.nix
  nixos-generate-config --root ${altroot}
  nixos-install
''