command/sudoers: Use Vagrant's ruby for the sudoers file

This makes things work on systems that don't have a global ruby
installation in place and fix GH-289

CHANGELOG.md

@@ -9,8 +9,12 @@ IMPROVEMENTS:
 BUG FIXES:
 
   - Escape space characters for synced folders [[GH-291]]
+  - Use Vagrant's ruby on the sudoers file so that it works on systems that don't
+    have a global ruby installation [[GH-289]]
 
 [GH-291]: https://github.com/fgrehm/vagrant-lxc/issues/291
+[GH-289]: https://github.com/fgrehm/vagrant-lxc/issues/289
+
 
 ## [1.0.0.alpha.2](https://github.com/fgrehm/vagrant-lxc/compare/v1.0.0.alpha.1...v1.0.0.alpha.2) (May 13, 2014)
 

lib/vagrant-lxc/command/sudoers.rb

@@ -44,7 +44,7 @@ module Vagrant
         #           lands into core
         def create_wrapper!
           wrapper = Tempfile.new('lxc-wrapper').tap do |file|
-            file.puts "#!/usr/bin/env ruby"
+            file.puts "#!/opt/vagrant/embedded/bin/ruby"
             file.puts "# Automatically created by vagrant-lxc"
             file.puts <<-EOF
 class Whitelist