Refactoring: make SudoWrapper a bit more self-contained

By looking at the code, it seems that it was a goal to make the sudo
wrapper path configurable through the Vagrantfile, but it wasn't
effective and didn't make much sense (that kind of config is a per-host
config, not a per-guest one).

This caused the cause to be needlessly complex by giving the Provider
the responsibility of instanciating the wrapper. This commit gets rid of
that.

I didn't get rid of `sudo_wrapper` injection in `Driver` and
`Driver::CLI` constructors because they're needed for tests. I'm not
ready to tackle this yet.

lib/vagrant-lxc.rb

@@ -1,22 +1,10 @@
 require "vagrant-lxc/version"
 require "vagrant-lxc/plugin"
-require "vagrant-lxc/sudo_wrapper"
 
 module Vagrant
   module LXC
     def self.source_root
       @source_root ||= Pathname.new(File.dirname(__FILE__)).join('..').expand_path
     end
-
-    def self.sudo_wrapper_path
-      "/usr/local/bin/vagrant-lxc-wrapper"
-    end
-
-    def self.sudo_wrapper
-      wrapper = Pathname.new(sudo_wrapper_path).exist? &&
-        sudo_wrapper_path || nil
-      SudoWrapper.new(wrapper)
-    end
-
   end
 end

lib/vagrant-lxc/command/sudoers.rb

@@ -1,6 +1,7 @@
 require 'tempfile'
 
 require "vagrant-lxc/driver"
+require "vagrant-lxc/sudo_wrapper"
 
 module Vagrant
   module LXC
@@ -27,7 +28,7 @@ module Vagrant
           argv = parse_options(opts)
           return unless argv
 
-          wrapper_path = Vagrant::LXC.sudo_wrapper_path
+          wrapper_path = SudoWrapper.bin_path
           wrapper = create_wrapper!
           sudoers = create_sudoers!(options[:user], wrapper_path)
 
@@ -45,7 +46,7 @@ module Vagrant
 
         # This requires vagrant 1.5.2+ https://github.com/mitchellh/vagrant/commit/3371c3716278071680af9b526ba19235c79c64cb
         def create_wrapper!
-          lxc_base_path = Driver.new(0, LXC.sudo_wrapper).containers_path
+          lxc_base_path = Driver.new("").containers_path
           wrapper = Tempfile.new('lxc-wrapper').tap do |file|
             template = Vagrant::Util::TemplateRenderer.new(
               'sudoers.rb',

lib/vagrant-lxc/config.rb

@@ -24,7 +24,6 @@ module Vagrant
         @customizations = []
         @backingstore = UNSET_VALUE
         @backingstore_options = []
-        @sudo_wrapper   = UNSET_VALUE
         @container_name = UNSET_VALUE
         @fetch_ip_tries = UNSET_VALUE
       end
@@ -50,7 +49,6 @@ module Vagrant
       end
 
       def finalize!
-        @sudo_wrapper = nil if @sudo_wrapper == UNSET_VALUE
         @container_name = nil if @container_name == UNSET_VALUE
         @backingstore = "best" if @backingstore == UNSET_VALUE
         @existing_container_name = nil if @existing_container_name == UNSET_VALUE

lib/vagrant-lxc/driver.rb

@@ -3,6 +3,7 @@ require "vagrant/util/subprocess"
 
 require "vagrant-lxc/errors"
 require "vagrant-lxc/driver/cli"
+require "vagrant-lxc/sudo_wrapper"
 
 require "etc"
 
@@ -21,10 +22,10 @@ module Vagrant
       attr_reader :container_name,
                   :customizations
 
-      def initialize(container_name, sudo_wrapper, cli = nil)
+      def initialize(container_name, sudo_wrapper = nil, cli = nil)
         @container_name = container_name
-        @sudo_wrapper   = sudo_wrapper
-        @cli            = cli || CLI.new(sudo_wrapper, container_name)
+        @sudo_wrapper   = sudo_wrapper || SudoWrapper.new()
+        @cli            = cli || CLI.new(@sudo_wrapper, container_name)
         @logger         = Log4r::Logger.new("vagrant::provider::lxc::driver")
         @customizations = []
       end

lib/vagrant-lxc/provider.rb

@@ -2,6 +2,7 @@ require "log4r"
 
 require "vagrant-lxc/action"
 require "vagrant-lxc/driver"
+require "vagrant-lxc/sudo_wrapper"
 
 module Vagrant
   module LXC
@@ -24,13 +25,9 @@ module Vagrant
         machine_id_changed
       end
 
-      def sudo_wrapper
-        @shell ||= LXC.sudo_wrapper
-      end
-
       def ensure_lxc_installed!
         begin
-          sudo_wrapper.run("which", "lxc-create")
+          SudoWrapper.new().run("which", "lxc-create")
         rescue Vagrant::LXC::Errors::ExecuteError
           raise Errors::LxcNotInstalled
         end
@@ -43,7 +40,7 @@ module Vagrant
 
         begin
           @logger.debug("Instantiating the container for: #{id.inspect}")
-          @driver = Driver.new(id, self.sudo_wrapper)
+          @driver = Driver.new(id)
           @driver.validate!
         rescue Driver::ContainerNotFound
           # The container doesn't exist, so we probably have a stale

lib/vagrant-lxc/sudo_wrapper.rb

@@ -6,8 +6,12 @@ module Vagrant
 
       attr_reader :wrapper_path
 
-      def initialize(wrapper_path = nil)
-        @wrapper_path = wrapper_path
+      def self.dest_path
+        "/usr/local/bin/vagrant-lxc-wrapper"
+      end
+
+      def initialize()
+        @wrapper_path = Pathname.new(SudoWrapper.dest_path).exist? && SudoWrapper.dest_path || nil
         @logger       = Log4r::Logger.new("vagrant::lxc::sudo_wrapper")
       end
 

spec/Vagrantfile

@@ -15,10 +15,6 @@ Vagrant.configure("2") do |config|
 
   config.cache.auto_detect = true
 
-  config.vm.provider :lxc do |lxc|
-    # lxc.sudo_wrapper = '/usr/bin/lxc-vagrant-wrapper'
-  end
-
   config.vm.provision :shell,
     inline: 'mkdir -p /vagrant/tmp && echo -n "Provisioned" > /vagrant/tmp/provisioning'