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

nixos/modules/services/ttys/gpm.nix

@@ -0,0 +1,51 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  cfg = config.services.gpm;
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.gpm = {
+
+      enable = mkOption {
+        default = false;
+        description = ''
+          Whether to enable GPM, the General Purpose Mouse daemon,
+          which enables mouse support in virtual consoles.
+        '';
+      };
+
+      protocol = mkOption {
+        default = "ps/2";
+        description = "Mouse protocol to use.";
+      };
+
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    jobs.gpm =
+      { description = "General purpose mouse";
+
+        startOn = "started udev";
+
+        exec = "${pkgs.gpm}/sbin/gpm -m /dev/input/mice -t ${cfg.protocol} -D &>/dev/null";
+      };
+
+  };
+
+}