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

nixos/modules/profiles/installation-device.nix

@@ -0,0 +1,56 @@
+# Provide a basic configuration for installation devices like CDs.
+{ config, pkgs, modules, ... }:
+
+with pkgs.lib;
+
+{
+  imports =
+    [ # Enable devices which are usually scanned, because we don't know the
+      # target system.
+      ../installer/scan/detected.nix
+      ../installer/scan/not-detected.nix
+
+      # Allow "nixos-rebuild" to work properly by providing
+      # /etc/nixos/configuration.nix.
+      ./clone-config.nix
+    ];
+
+  config = {
+
+    # Show the manual.
+    services.nixosManual.showManual = true;
+
+    # Let the user play Rogue on TTY 8 during the installation.
+    services.rogue.enable = true;
+
+    # Disable some other stuff we don't need.
+    security.sudo.enable = false;
+
+    # Include only the en_US locale.  This saves 75 MiB or so compared to
+    # the full glibcLocales package.
+    i18n.supportedLocales = ["en_US.UTF-8/UTF-8" "en_US/ISO-8859-1"];
+
+    # Some more help text.
+    services.mingetty.helpLine =
+      ''
+
+        Log in as "root" with an empty password.  ${
+          optionalString config.services.xserver.enable
+            "Type `start display-manager' to\nstart the graphical user interface."}
+      '';
+
+    # Allow sshd to be started manually through "start sshd".
+    services.openssh.enable = true;
+    systemd.services.sshd.wantedBy = mkOverride 50 [];
+
+    # Enable wpa_supplicant, but don't start it by default.
+    networking.wireless.enable = true;
+    jobs.wpa_supplicant.startOn = pkgs.lib.mkOverride 50 "";
+
+    # Tell the Nix evaluator to garbage collect more aggressively.
+    # This is desirable in memory-constrained environments that don't
+    # (yet) have swap set up.
+    environment.variables.GC_INITIAL_HEAP_SIZE = "100000";
+
+  };
+}