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# This module contains the basic configuration for building a NixOS
# installation CD.
{ config, lib, pkgs, ... }:
with 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 11 "NIXOS_ISO";
# 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. Archive::Cpio is needed for the
# initrd builder.
isoImage.storeContents = [ pkgs.stdenv pkgs.busybox pkgs.perlPackages.ArchiveCpio ];
# EFI booting
isoImage.makeEfiBootable = true;
# USB booting
isoImage.makeUsbBootable = true;
# Add Memtest86+ to the CD.
boot.loader.grub.memtest86.enable = true;
# Get a console as soon as the initrd loads fbcon on EFI boot.
boot.initrd.kernelModules = [ "fbcon" ];
# Add support for cow filesystems and their utilities
boot.supportedFilesystems = [ "zfs" "btrfs" ];
# Configure host id for ZFS to work
networking.hostId = "8425e349";
# Allow the user to log in as root without a password.
users.extraUsers.root.initialHashedPassword = "";
}
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