Generate metadata.json in root of package.

plugins/providers/hyperv/action.rb

@@ -87,6 +87,7 @@ module VagrantPlugins
             b2.use Package
             b2.use Export
             b2.use PackageVagrantfile
+            b2.use PackageMetadataJson
           end
         end
       end
@@ -291,6 +292,7 @@ module VagrantPlugins
       autoload :PackageSetupFolders, action_root.join("package_setup_folders")
       autoload :PackageSetupFiles, action_root.join("package_setup_files")
       autoload :PackageVagrantfile, action_root.join("package_vagrantfile")
+      autoload :PackageMetadataJson, action_root.join("package_metadata_json")
       autoload :Export, action_root.join("export")
 
       autoload :CheckEnabled, action_root.join("check_enabled")

plugins/providers/hyperv/action/package_metadata_json.rb

@@ -0,0 +1,34 @@
+require "json"
+
+#require 'vagrant/util/template_renderer'
+
+module VagrantPlugins
+  module HyperV
+    module Action
+      class PackageMetadataJson
+        # For TemplateRenderer
+        include Vagrant::Util
+
+        def initialize(app, env)
+          @app = app
+        end
+
+        def call(env)
+          @env = env
+          create_metadata
+          @app.call(env)
+        end
+
+        # This method creates a metadata.json file to tell vagrant this is a
+        # Hyper V box
+        def create_metadata
+          File.open(File.join(@env["export.temp_dir"], "metadata.json"), "w") do |f|
+            f.write(JSON.generate({
+              provider: "hyperv"
+            }))
+          end
+        end
+      end
+    end
+  end
+end