* A simple module for running wpa_supplicant.

svn path=/nixos/branches/modular-nixos/; revision=16409

modules/module-list.nix

@@ -64,6 +64,7 @@
   ./services/networking/ssh/lshd.nix
   ./services/networking/ssh/sshd.nix
   ./services/networking/vsftpd.nix
+  ./services/networking/wpa_supplicant.nix
   ./services/printing/cupsd.nix
   ./services/scheduling/atd.nix
   ./services/scheduling/cron.nix

modules/services/networking/wpa_supplicant.nix

@@ -0,0 +1,54 @@
+{pkgs, config, ...}:
+
+let
+
+  configFile = "/etc/wpa_supplicant.conf";
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+  
+    networking.enableWLAN = pkgs.lib.mkOption {
+      default = false;
+      description = ''
+        Whether to start <command>wpa_supplicant</command> to scan for
+        and associate with wireless networks.  Note: NixOS currently
+        does not generate <command>wpa_supplicant</command>'s
+        configuration file, <filename>${configFile}</filename>.  You
+        should edit this file yourself to define wireless networks,
+        WPA keys and so on (see
+        <citerefentry><refentrytitle>wpa_supplicant.conf</refentrytitle>
+        <manvolnum>5</manvolnum></citerefentry>).
+      '';
+    };
+  
+  };
+
+
+  ###### implementation
+  
+  config = pkgs.lib.mkIf config.networking.enableWLAN {
+
+    environment.systemPackages = [pkgs.wpa_supplicant];
+
+    jobs = pkgs.lib.singleton
+      { name = "wpa_supplicant";
+
+        preStart =
+          ''
+            touch -a ${configFile}
+            chmod 600 ${configFile}
+          '';
+
+        exec =
+          "${pkgs.wpa_supplicant}/sbin/wpa_supplicant " +
+          "-C /var/run/wpa_supplicant -c ${configFile} -iwlan0";
+      };
+  
+  };
+
+}