From aac71e8f95b47d0a8a34d63be283b708f57cda7c Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Thu, 3 Nov 2011 02:14:57 +0000
Subject: [PATCH] * Add a module for DRBD.

svn path=/nixos/trunk/; revision=30202
---
 modules/module-list.nix                       |  1 +
 modules/services/network-filesystems/drbd.nix | 77 +++++++++++++++++++
 .../activation/switch-to-configuration.sh     |  2 +-
 3 files changed, 79 insertions(+), 1 deletion(-)
 create mode 100644 modules/services/network-filesystems/drbd.nix

diff --git a/modules/module-list.nix b/modules/module-list.nix
index 13e56dc8f68..6ba0c447aed 100644
--- a/modules/module-list.nix
+++ b/modules/module-list.nix
@@ -96,6 +96,7 @@
   ./services/monitoring/systemhealth.nix
   ./services/monitoring/zabbix-agent.nix
   ./services/monitoring/zabbix-server.nix
+  ./services/network-filesystems/drbd.nix
   ./services/network-filesystems/nfs-kernel.nix
   ./services/network-filesystems/openafs-client/default.nix
   ./services/network-filesystems/samba.nix
diff --git a/modules/services/network-filesystems/drbd.nix b/modules/services/network-filesystems/drbd.nix
new file mode 100644
index 00000000000..1c70d44f6ba
--- /dev/null
+++ b/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 =
+          ''
+            ${pkgs.drbd}/sbin/drbdadm down all
+          '';
+      };
+    
+  };
+  
+}
diff --git a/modules/system/activation/switch-to-configuration.sh b/modules/system/activation/switch-to-configuration.sh
index 2586d492d9e..3be1b210d6a 100644
--- a/modules/system/activation/switch-to-configuration.sh
+++ b/modules/system/activation/switch-to-configuration.sh
@@ -114,7 +114,7 @@ EOF
 	# Xen domains unless we have to.
         # TODO: Jobs should be able to declare that they should not be
 	# auto-restarted.
-        if echo "$job" | grep -q "^shutdown$\|^control-alt-delete$\|^xserver$\|^dbus$\|^disnix$\|^emergency-shell$\|^xendomains$\|^udevtrigger$"; then continue; fi
+        if echo "$job" | grep -q "^shutdown$\|^control-alt-delete$\|^xserver$\|^dbus$\|^disnix$\|^emergency-shell$\|^xendomains$\|^udevtrigger$\|^drbd-down$"; then continue; fi
 
         if ! test -e "$oldJobs/$job.conf"; then
             echo "starting $job..."