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

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Nix

# This module contains the basic configuration for building a NixOS
# installation CD.
{ config, lib, pkgs, ... }:
with lib;
{
imports =
[ ./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 11 "NIXOS_ISO";
# EFI booting
isoImage.makeEfiBootable = true;
# USB booting
isoImage.makeUsbBootable = true;
# Add Memtest86+ to the CD.
boot.loader.grub.memtest86.enable = true;
# Allow the user to log in as root without a password.
users.extraUsers.root.initialHashedPassword = "";
}