Add base skeleton for `vagrant push`

lib/vagrant/plugin/v2.rb

@@ -16,6 +16,7 @@ module Vagrant
       autoload :Manager, "vagrant/plugin/v2/manager"
       autoload :Plugin, "vagrant/plugin/v2/plugin"
       autoload :Provider, "vagrant/plugin/v2/provider"
+      autoload :Push, "vagrant/plugin/v2/push"
       autoload :Provisioner, "vagrant/plugin/v2/provisioner"
       autoload :SyncedFolder, "vagrant/plugin/v2/synced_folder"
     end

lib/vagrant/plugin/v2/plugin.rb

@@ -221,6 +221,19 @@ module Vagrant
           data[:provisioners]
         end
 
+        # Registers additional pushes to be available.
+        #
+        # @param [String] name Name of the push.
+        def self.push(name=UNSET_VALUE, &block)
+          data[:pushes] ||= Registry.new
+
+          # Register a new pusher class only if a name was given
+          data[:pushes].register(name.to_sym, &block) if name != UNSET_VALUE
+
+          # Return the registry
+          data[:pushes]
+        end
+
         # Registers additional synced folder implementations.
         #
         # @param [String] name Name of the implementation.

lib/vagrant/plugin/v2/push.rb

@@ -0,0 +1,31 @@
+module Vagrant
+  module Plugin
+    module V2
+      class Push
+        attr_reader :machine
+        attr_reader :config
+
+        # Initializes the pusher with the machine that exists for this project
+        # as well as the configuration (the push configuration, not the full machine
+        # configuration).
+        #
+        # The pusher should _not_ do anything at this point except
+        # initialize internal state.
+        #
+        # @param [Machine] machine The machine associated with this code.
+        # @param [Object] config Push configuration, if one was set.
+        def initialize(machine, config)
+          @machine = machine
+          @config  = config
+        end
+
+        # This is the method called when the actual pushing should be
+        # done.
+        #
+        # No return value is expected.
+        def push
+        end
+      end
+    end
+  end
+end