# 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. These are installed into the "nixos" channel of the root # user, as expected by nixos-rebuild/nixos-install. channelSources = pkgs.runCommand "nixos-${config.system.nixosVersion}" { expr = builtins.readFile ../../../lib/channel-expr.nix; } '' mkdir -p $out/nixos cp -prd ${cleanSource ../../..} $out/nixos/nixos cp -prd ${cleanSource } $out/nixos/nixpkgs chmod -R u+w $out/nixos/nixos echo -n ${config.system.nixosVersion} > $out/nixos/nixos/.version echo -n "" > $out/nixos/nixos/.version-suffix echo "$expr" > $out/nixos/default.nix ''; includeSources = true; in { require = [ ./memtest.nix ./iso-image.nix # Profiles of this basic installation CD. ../../profiles/all-hardware.nix ../../profiles/base.nix ../../profiles/installation-device.nix ]; # ISO naming. isoImage.isoName = "${config.isoImage.isoBaseName}-${config.system.nixosVersion}-${pkgs.stdenv.system}.iso"; isoImage.volumeID = "NIXOS_${config.system.nixosVersion}"; installer.nixosURL = "http://nixos.org/releases/nixos/nixos-${config.system.nixosVersion}"; boot.postBootCommands = '' # Provide the NixOS/Nixpkgs sources in /etc/nixos. This is required # for nixos-install. ${optionalString includeSources '' echo "unpacking the NixOS/Nixpkgs sources..." mkdir -p /nix/var/nix/profiles/per-user/root ${config.environment.nix}/bin/nix-env -p /nix/var/nix/profiles/per-user/root/channels -i ${channelSources} --quiet mkdir -m 0700 -p /root/.nix-defexpr ln -s /nix/var/nix/profiles/per-user/root/channels /root/.nix-defexpr/channels ''} # 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.busybox ]; }