Add NetworkManager module

It works but it doesn't respect ignoredInterfaces etc.
Probably I forgotten to create some directories (all of them exist on my
laptop). Feel free to fix this module.

svn path=/nixos/trunk/; revision=33097

modules/module-list.nix

@@ -128,6 +128,7 @@
   ./services/networking/ifplugd.nix
   ./services/networking/ircd-hybrid/default.nix
   ./services/networking/nat.nix
+  ./services/networking/networkmanager.nix
   ./services/networking/ntpd.nix
   ./services/networking/oidentd.nix
   ./services/networking/openfire.nix

modules/services/networking/networkmanager.nix

@@ -0,0 +1,80 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+
+  stateDir = "/var/lib/NetworkManager";
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    networking.networkmanager.enable = mkOption {
+      default = false;
+      merge = mergeEnableOption;
+      description = ''
+        Whether to use NetworkManager to obtain an IP adress and other
+        configuration for all network interfaces that are not manually
+        configured.
+      '';
+    };
+
+    networking.networkmanager.packages = mkOption {
+      default = [ pkgs.networkmanager ];
+      description =
+        ''
+          Packages providing NetworkManager plugins.
+        '';
+    };
+  };
+
+
+  ###### implementation
+
+  config = mkIf config.networking.networkmanager.enable {
+
+    jobs.networkmanager =
+      { startOn = "started network-interfaces";
+        stopOn = "stopping network-interfaces";
+
+        script =
+          ''
+            mkdir -m 755 -p /etc/NetworkManager
+            mkdir -m 700 -p /etc/NetworkManager/system-connections
+            mkdir -m 755 -p ${stateDir}
+
+            if [[ ! -f /etc/NetworkManager/NetworkManager.conf ]]; then
+            cat <<-EOF > /etc/NetworkManager/NetworkManager.conf
+            [main]
+            plugins=keyfile
+            EOF
+            fi
+
+            exec ${pkgs.networkmanager}/sbin/NetworkManager --no-daemon
+          '';
+      };
+
+    environment.systemPackages = config.networking.networkmanager.packages;
+    services.dbus.packages = config.networking.networkmanager.packages;
+    networking.useDHCP = false;
+
+    environment.etc = [
+      {
+        source = pkgs.writeScript "01nixos-ip-up"
+          ''
+          #!/bin/sh
+          if test "$2" = "up"; then
+            ${pkgs.upstart}/sbin/initctl emit ip-up
+          fi
+          '';
+        target = "NetworkManager/dispatcher.d/01nixos-ip-up";
+      }
+    ];
+  };
+}
+