--- a/dev/Vagrantfile	Fri Mar 14 10:03:37 2014 +0100
+++ b/dev/Vagrantfile	Fri Mar 14 13:16:10 2014 +0100
@@ -5,7 +5,7 @@
 
 custom_file_path = File.join(__dir__, (ENV['SYSCONFIG'] || 'custom.yaml'))
 
-context = File.exist?(custom_file_path)?YAML::load_file(custom_file_path):{}
+context = (File.exist?(custom_file_path)?YAML::load_file(custom_file_path):{}) || {}
 
 ROOT_PATH = context.fetch("root_path","../")
 
@@ -18,11 +18,11 @@
   # please see the online documentation at vagrantup.com.
 
   # Every Vagrant virtual environment requires a box to build off of.
-  config.vm.box = "wheezy-73-x64"
+  config.vm.box = context.fetch("vm_box","wheezy-73-x64")
 
   # The url from where the 'config.vm.box' box will be fetched if it
   # doesn't already exist on the user's system.
-  config.vm.box_url = "http://puppet-vagrant-boxes.puppetlabs.com/debian-73-x64-virtualbox-puppet.box"
+  config.vm.box_url = context.fetch("vm_box_url","http://puppet-vagrant-boxes.puppetlabs.com/debian-73-x64-virtualbox-puppet.box")
 
   # Create a forwarded port mapping which allows access to a specific port
   # within the machine from a port on the host machine. In the example below,