More accurate VBoxManage error detection.

CHANGELOG.md

@@ -13,6 +13,7 @@
   - Fix issue where VM import sometimes made strange VirtualBox folder
     layouts. [GH-669]
   - Call proper `id` command on Solaris. [GH-679]
+  - More accurate VBoxManage error detection.
 
 ## 0.9.3 (January 24, 2012)
 

lib/vagrant/driver/virtualbox_base.rb

@@ -260,6 +260,14 @@ module Vagrant
           else
             raise Errors::VBoxManageError, :command => command.inspect
           end
+        else
+          # Sometimes, VBoxManage fails but doesn't actual return a non-zero
+          # exit code. For this we inspect the output and determine if an error
+          # occurred.
+          if r.stderr =~ /VBoxManage: error:/
+            @logger.info("VBoxManage error text found, assuming error.")
+            raise Errors::VBoxManageError, :command => command.inspect
+          end
         end
 
         # Return the output, making sure to replace any Windows-style