Adding a wake on lan module.

svn path=/nixos/trunk/; revision=24958

modules/config/power-management.nix

@@ -10,9 +10,14 @@ let
     ''
       #! ${pkgs.stdenv.shell}
       action="$1"
-      if [ "$action" = "resume" ]; then
+      case "$action" in
+          hibernate|suspend)
+              ${cfg.powerDownCommands}
+              ;;
+          thaw|resume)
               ${cfg.resumeCommands}
               ${cfg.powerUpCommands}
+              ;;
       fi
     '';
 
@@ -51,6 +56,17 @@ in
           '';
       };
 
+      powerDownCommands = mkOption {
+        default = "";
+        example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
+        description =
+          ''
+            Commands executed when the machine powers down.  That is,
+            they're executed both when the system shuts down and when
+            it goes to suspend or hibernation.
+          '';
+      };
+      
     };
     
   };

modules/module-list.nix

@@ -107,6 +107,7 @@
   ./services/networking/ssh/sshd.nix
   ./services/networking/tftpd.nix
   ./services/networking/vsftpd.nix
+  ./services/networking/wakeonlan.nix
   ./services/networking/wicd.nix
   ./services/networking/wpa_supplicant.nix
   ./services/networking/xinetd.nix

modules/services/networking/wakeonlan.nix

@@ -0,0 +1,56 @@
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let
+  interfaces = config.services.wakeonlan.interfaces;
+
+  ethtool = "${pkgs.ethtool}/sbin/ethtool";
+
+  passwordParameter = password : if (password == "") then "" else
+    "sopass ${password}";
+
+  methodParameter = {method, password} :
+    if method == "magicpacket" then "wol g"
+    else if method == "password" then "wol s so ${passwordParameter password}"
+    else throw "Wake-On-Lan method not supported";
+    
+  line = { interface, method ? "magicpacket", password ? "" }: ''
+    ${ethtool} -s ${interface} ${methodParameter {inherit method password;}}
+  '';
+
+  concatStrings = fold (x: y: x + y) "";
+  lines = concatStrings (map (l: line l) interfaces);
+
+in
+{
+
+  ###### interface
+  
+  options = {
+
+    services.wakeonlan.interfaces = mkOption {
+      default = [ ];
+      example = [
+        {
+          interface = "eth0";
+          method = "password";
+          password = "00:11:22:33:44:55";
+        }
+      ];
+      description = ''
+        Interfaces where to enable Wake-On-LAN, and how. Two methods available:
+        "magickey" and "password". The password has the shape of six bytes
+        in hexadecimal separated by a colon each. For more information,
+        check the ethtool manual.
+      '';
+    };
+
+  };
+
+
+  ###### implementation
+
+  config.powerManagement.powerDownCommands = lines;
+
+}

modules/system/upstart-events/shutdown.nix

@@ -30,6 +30,8 @@ with pkgs.lib;
           fi
           echo ""
 
+          ${config.powerManagement.powerDownCommands}
+      
           export PATH=${pkgs.utillinux}/bin:${pkgs.utillinux}/sbin:$PATH