Move all of NixOS to nixos/ in preparation of the repository merge

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

@@ -0,0 +1,37 @@
+# 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;
+}