Inject dummy client into remote synced folders

lib/vagrant/action/builtin/remote/mixin_synced_folders.rb

@@ -13,6 +13,12 @@ module Vagrant
             end
           end
 
+          # This returns the available synced folder implementations. This
+          # is a separate method so that it can be easily stubbed by tests.
+          def plugins
+            @plugins ||= Vagrant.plugin("remote").manager.synced_folders
+          end
+
           # This should never be called?
           def default_synced_folder_type(machine, plugins)
             nil

lib/vagrant/plugin/remote/manager.rb

@@ -9,12 +9,43 @@ module Vagrant
       class Manager < Vagrant::Plugin::V2::Manager
         attr_reader :registered
 
-        def initialize()
+        def initialize
           @logger = Log4r::Logger.new("vagrant::plugin::remote::manager")
+          @logger.debug("initializing remote manager")
           # Copy in local Ruby registered plugins
           @registered = Vagrant.plugin("2").manager.registered
         end
 
+        # This returns all synced folder implementations.
+        #
+        # @return [Registry]
+        def synced_folders
+          Registry.new.tap do |result|
+            @registered.each do |plugin|
+              plugin.components.synced_folders.each do |k, v|
+                sf_class = Class.new(v[0])
+                sf_class.class_eval do
+                  def initialize(*_, **_)
+                    super(@@client)
+                  end
+                  def self.client=(val)
+                    @@client=val
+                  end
+                  def self.client
+                    @@client
+                  end
+                end
+                # TODO: set the actual client
+                sf_class.client = "todo"
+                v = [sf_class] + v[1..]
+                result.register(k) do
+                  v
+                end
+              end
+            end
+          end
+        end
+
         # Registers remote plugins provided from the client
         #
         # @param [VagrantPlugin::Command::Serve::Client::Basis]

lib/vagrant/plugin/v2/plugin.rb

@@ -24,9 +24,12 @@ module Vagrant
         #
         # @return [V2::Manager]
         def self.manager
+          @manager if !@manager.nil?
           if Vagrant.server_mode?
+            LOGGER.debug("using remote manager")
             @manager ||= Vagrant::Plugin::Remote::Manager.new
           else
+            LOGGER.debug("using v2 manager")
             @manager ||= Manager.new
           end
           @manager