nixos-minimal-installer.nix

{ lib, pkgs, config, nixpkgs-modules-path, ... }:
{
  imports =
    [
      "${nixpkgs-modules-path}/nixos/modules/installer/cd-dvd/iso-image.nix"
      # Profiles of this basic installation CD.
      "${nixpkgs-modules-path}/nixos/modules/profiles/base.nix"
      "${nixpkgs-modules-path}/nixos/modules/profiles/installation-device.nix"
    ];

  # ISO naming.
  isoImage.isoName = "${config.isoImage.isoBaseName}-${config.system.nixos.label}-${pkgs.stdenv.hostPlatform.system}.iso";

  # EFI booting
  isoImage.makeEfiBootable = true;

  # Add Memtest86+ to the CD.
  boot.loader.grub.memtest86.enable = true;

  # An installation media cannot tolerate a host config defined file
  # system layout on a fresh machine, before it has been formatted.
  swapDevices = lib.mkImageMediaOverride [ ];
  fileSystems = lib.mkImageMediaOverride config.lib.isoFileSystems;

  boot.postBootCommands = ''
    for o in $(</proc/cmdline); do
      case "$o" in
        live.nixos.passwd=*)
          set -- $(IFS==; echo $o)
          echo "nixos:$2" | ${pkgs.shadow}/bin/chpasswd
          ;;
      esac
    done
  '';

  system.stateVersion = lib.mkDefault lib.trivial.release;

  # Causes a lot of uncached builds for a negligible decrease in size.
  environment.noXlibs = lib.mkOverride 500 false;

  documentation.man.enable = lib.mkOverride 500 true;

  # Although we don't really need HTML documentation in the minimal installer,
  # not including it may cause annoying cache misses in the case of the NixOS manual.
  documentation.doc.enable = lib.mkOverride 500 true;

  fonts.fontconfig.enable = lib.mkForce false;

  isoImage.edition = lib.mkForce "minimal";
}