Add cleanup_disks action

lib/vagrant/action/builtin/cleanup_disks.rb

@@ -0,0 +1,49 @@
+require "json"
+
+module Vagrant
+  module Action
+    module Builtin
+      class CleanupDisks
+        # Removes any attached disks no longer defined in a Vagrantfile config
+        def initialize(app, env)
+          @app    = app
+          @logger = Log4r::Logger.new("vagrant::action::builtin::disk")
+        end
+
+        def call(env)
+          machine = env[:machine]
+          defined_disks = get_disks(machine, env)
+
+          # Call into providers machine implementation for disk management
+          if !defined_disks.empty?
+            if machine.provider.capability?(:cleanup_disks)
+              machine.provider.capability(:cleanup_disks, defined_disks)
+            else
+              env[:ui].warn(I18n.t("vagrant.actions.disk.provider_unsupported",
+                                 provider: machine.provider_name))
+            end
+          end
+
+          # Continue On
+          @app.call(env)
+        end
+
+        def read_disk_metadata(machine)
+          meta_file = machine.data_dir.join("disk_meta")
+          disk_meta = JSON.parse(meta_file.read)
+
+          return disk_meta
+        end
+
+        def get_disks(machine, env)
+          return @_disks if @_disks
+
+          @_disks = []
+          @_disks = machine.config.vm.disks
+
+          @_disks
+        end
+      end
+    end
+  end
+end