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|
# This module contains the basic configuration for building a NixOS
# installation CD.
{ config, pkgs, ... }:
with pkgs.lib;
let
# We need a copy of the Nix expressions for Nixpkgs and NixOS on the
# CD. We put them in a tarball because accessing that many small
# files from a slow device like a CD-ROM takes too long. !!! Once
# we use squashfs, maybe we won't need this anymore.
makeTarball = tarName: input: pkgs.runCommand "tarball" {inherit tarName;}
''
ensureDir $out
(cd ${input} && tar cvfj $out/${tarName} . \
--exclude '*~' --exclude 'result')
'';
# Put the current directory in a tarball.
nixosTarball = makeTarball "nixos.tar.bz2" (cleanSource ../../..);
# Put Nixpkgs in a tarball.
nixpkgsTarball = makeTarball "nixpkgs.tar.bz2" (cleanSource pkgs.path);
includeSources = true;
in
{
require =
[ ./memtest.nix
./iso-image.nix
# Profiles of this basic installation CD.
../../profiles/base.nix
../../profiles/installation-device.nix
];
# ISO naming.
isoImage.isoName = "${config.isoImage.isoBaseName}-${config.system.nixosVersion}-${pkgs.stdenv.system}.iso";
isoImage.volumeID = "NIXOS_INSTALL_CD_${config.system.nixosVersion}";
boot.postBootCommands =
''
export PATH=${pkgs.gnutar}/bin:${pkgs.bzip2}/bin:$PATH
# Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required
# for nixos-install.
${optionalString includeSources ''
echo "unpacking the NixOS/Nixpkgs sources..."
mkdir -p /etc/nixos/nixos
tar xjf ${nixosTarball}/nixos.tar.bz2 -C /etc/nixos/nixos
mkdir -p /etc/nixos/nixpkgs
tar xjf ${nixpkgsTarball}/nixpkgs.tar.bz2 -C /etc/nixos/nixpkgs
chown -R root.root /etc/nixos
''}
# 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.
echo 1 > /proc/sys/vm/overcommit_memory
'';
# To speed up installation a little bit, include the complete stdenv
# in the Nix store on the CD.
isoImage.storeContents = [ pkgs.stdenv pkgs.klibc pkgs.klibcShrunk ];
}
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