From 967f7bce1a0102e2366e1e5ac0cf0b567126879c Mon Sep 17 00:00:00 2001
From: Mitchell Hashimoto <mitchell.hashimoto@gmail.com>
Date: Thu, 10 Apr 2014 10:02:27 -0700
Subject: [PATCH] providers/virtualbox: usability test

---
 plugins/providers/virtualbox/provider.rb | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/plugins/providers/virtualbox/provider.rb b/plugins/providers/virtualbox/provider.rb
index 61c7a5ef5..a52c07fb3 100644
--- a/plugins/providers/virtualbox/provider.rb
+++ b/plugins/providers/virtualbox/provider.rb
@@ -5,6 +5,19 @@ module VagrantPlugins
     class Provider < Vagrant.plugin("2", :provider)
       attr_reader :driver
 
+      def self.usable?(raise_error=false)
+        # Instantiate the driver, which will determine the VirtualBox
+        # version and all that, which checks for VirtualBox being present
+        Driver::Meta.new
+        true
+      rescue Vagrant::Errors::VirtualBoxInvalidVersion
+        raise if raise_error
+        return false
+      rescue Vagrant::Errors::VirtualBoxNotDetected
+        raise if raise_error
+        return false
+      end
+
       def initialize(machine)
         @logger  = Log4r::Logger.new("vagrant::provider::virtualbox")
         @machine = machine