* Add a module for DRBD.

svn path=/nixos/trunk/; revision=30202

modules/services/network-filesystems/drbd.nix

@@ -0,0 +1,77 @@
+# Support for DRBD, the Distributed Replicated Block Device.
+
+{ config, pkgs, ... }:
+
+with pkgs.lib;
+
+let cfg = config.services.drbd; in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.drbd.enable = mkOption {
+      default = false;
+      type = types.bool;
+      description = ''
+        Whether to enable support for DRBD, the Distributed Replicated
+        Block Device.
+      '';
+    };
+
+    services.drbd.config = mkOption {
+      default = "";
+      type = types.string;
+      description = ''
+        Contents of the <filename>drbd.conf</filename> configuration file.
+      '';
+    };
+
+  };
+
+  
+  ###### implementation
+
+  config = mkIf cfg.enable {
+  
+    environment.systemPackages = [ pkgs.drbd ];
+    
+    services.udev.packages = [ pkgs.drbd ];
+
+    boot.kernelModules = [ "drbd" ];
+
+    boot.extraModprobeConfig =
+      ''
+        options drbd usermode_helper=/var/run/current-system/sw/sbin/drbdadm
+      '';
+
+    environment.etc = singleton
+      { source = pkgs.writeText "drbd.conf" cfg.config;
+        target = "drbd.conf";
+      };
+
+    jobs.drbd_up =
+      { name = "drbd-up";
+        startOn = "stopped udevtrigger or ip-up";
+        task = true;
+        script =
+          ''
+            ${pkgs.drbd}/sbin/drbdadm up all
+          '';
+      };
+    
+    jobs.drbd_down =
+      { name = "drbd-down";
+        startOn = "starting shutdown";
+        task = true;
+        script =
+          ''
+            ${pkgs.drbd}/sbin/drbdadm down all
+          '';
+      };
+    
+  };
+  
+}