nixpkgs/modules/installer/cd-dvd/installation-cd-base.nix

# This module contains the basic configuration for building a NixOS
# installation CD.

{ config, pkgs, ... }:

with pkgs.lib;

{
  imports =
    [ ./channel.nix
      ./iso-image.nix

      # Profiles of this basic installation CD.
      ../../profiles/all-hardware.nix
      ../../profiles/base.nix
      ../../profiles/installation-device.nix
    ];

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

  isoImage.volumeID = substring 0 32 "NIXOS_${config.system.nixosVersion}";

  # Make the installer more likely to succeed in low memory
  # environments.  The kernel's overcommit heustistics bite us
  # fairly often, preventing processes such as nix-worker or
  # download-using-manifests.pl from forking even if there is
  # plenty of free memory.
  boot.kernel.sysctl."vm.overcommit_memory" = "1";

  # To speed up installation a little bit, include the complete stdenv
  # in the Nix store on the CD.
  isoImage.storeContents = [ pkgs.stdenv pkgs.busybox ];

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