commands/plugin: uninstall works again

lib/vagrant/bundler.rb

@@ -67,13 +67,19 @@ module Vagrant
         ::Bundler::Installer.install(root, definition, opts)
       end
 
-      # Clean up any unused/old gems
-      runtime = ::Bundler::Runtime.new(root, definition)
-      #runtime.clean
-
       definition.specs
     end
 
+    # Clean removes any unused gems.
+    def clean(plugins)
+      gemfile    = build_gemfile(plugins)
+      lockfile   = "#{gemfile.path}.lock"
+      definition = ::Bundler::Definition.build(gemfile, lockfile, nil)
+      root       = File.dirname(gemfile.path)
+      runtime    = ::Bundler::Runtime.new(root, definition)
+      runtime.clean
+    end
+
     # Builds a valid Gemfile for use with Bundler given the list of
     # plugins.
     #

lib/vagrant/plugin/manager.rb

@@ -40,6 +40,16 @@ module Vagrant
         result
       end
 
+      # Uninstalls the plugin with the given name.
+      #
+      # @param [String] name
+      def uninstall_plugin(name)
+        @global_file.remove_plugin(name)
+
+        # Clean the environment, removing any old plugins
+        Vagrant::Bundler.instance.clean(installed_plugins)
+      end
+
       # This returns the list of plugins that should be enabled.
       #
       # @return [Array<String>]

plugins/commands/plugin/action/uninstall_plugin.rb

@@ -13,7 +13,9 @@ module VagrantPlugins
           # Remove it!
           env[:ui].info(I18n.t("vagrant.commands.plugin.uninstalling",
                                :name => env[:plugin_name]))
-          env[:plugin_state_file].remove_plugin(env[:plugin_name])
+
+          manager = Vagrant::Plugin::Manager.instance
+          manager.uninstall_plugin(env[:plugin_name])
 
           @app.call(env)
         end