From aeb89fc753c6f95c9d143e6f5346f92e4a02fa67 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <eelco.dolstra@logicblox.com>
Date: Tue, 5 Oct 2010 17:58:58 +0000
Subject: [PATCH] * Set /proc/sys/kernel/poweroff_cmd to Upstart's poweroff
 command   (rather than /sbin/poweroff).  Xen's "xm shutdown" needs this to  
 enable the host to cleanly shutdown the guest.

svn path=/nixos/trunk/; revision=24094
---
 modules/system/upstart-events/control-alt-delete.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/modules/system/upstart-events/control-alt-delete.nix b/modules/system/upstart-events/control-alt-delete.nix
index 5fa2bd87eb9..f0f146160e5 100644
--- a/modules/system/upstart-events/control-alt-delete.nix
+++ b/modules/system/upstart-events/control-alt-delete.nix
@@ -15,4 +15,12 @@
           shutdown -r now 'Ctrl-Alt-Delete pressed'
         '';
     };
+
+  system.activationScripts.poweroff =
+    ''
+      # Allow the kernel to find the poweroff command.  This is used
+      # (for instance) by Xen's "xm shutdown" command to signal a
+      # guest to shut down cleanly.
+      echo ${config.system.build.upstart}/sbin/poweroff > /proc/sys/kernel/poweroff_cmd
+    '';
 }