Get parents from guest plugin

lib/vagrant/guest/remote.rb

@@ -60,6 +60,7 @@ module Vagrant
       #
       # @return [Symbol]
       def name
+        # TODO: this can probably be deleted
         client.parents[0]
       end
 

lib/vagrant/plugin/v2/guest.rb

@@ -17,6 +17,25 @@ module Vagrant
         def detect?(machine)
           false
         end
+
+        # Returns list of parents for
+        # this guest
+        #
+        # @return [Array<Symbol>]
+        def parents
+          guests = Vagrant.plugin("2").manager.guests.to_hash
+          ancestors = []
+          n, entry = guests.detect { |_, v| v.first == self.class }
+          while n
+            n = nil
+            if entry.last
+              ancestors << entry.last
+              entry = guests[entry.last]
+              n = entry.last
+            end
+          end
+          ancestors
+        end
       end
     end
   end

plugins/commands/serve/service/guest_service.rb

@@ -64,26 +64,15 @@ module VagrantPlugins
           )
         end
 
-        def get_parent_chain(plugin_name)
-          chain = [plugin_name]
-          plugins = Vagrant.plugin("2").manager.guests[plugin_name.to_s.to_sym].to_a
-          if plugins.last.nil?
-            return chain
-          else
-            chain + get_parent_chain(plugins.last)
-          end
-        end
-
         def parents(req, ctx)
           ServiceInfo.with_info(ctx) do |info|
             plugin_name = info.plugin_name
-            plugin = Vagrant.plugin("2").manager.guests[plugin_name.to_s.to_sym].to_a
-            if !plugin.first
+            plugin = Vagrant.plugin("2").manager.guests[plugin_name.to_s.to_sym].to_a.first
+            if !plugin
               raise "Failed to locate guest plugin for: #{plugin_name.inspect}"
             end
-            guest_chain = get_parent_chain(plugin_name.to_s.to_sym)
             SDK::Platform::ParentsResp.new(
-              parents: guest_chain
+              parents: plugin.new.parents
             )
           end
         end

test/unit/plugins/commands/serve/service/guest_service_test.rb

@@ -1,6 +1,7 @@
 require File.expand_path("../../../../../base", __FILE__)
 
 require Vagrant.source_root.join("plugins/commands/serve/command")
+require Vagrant.source_root.join("plugins/commands/serve/broker").to_s
 
 class DummyContext
   attr_reader :metadata
@@ -34,6 +35,12 @@ describe VagrantPlugins::CommandServe::Service::GuestService do
   subject { described_class.new(broker: broker) }
 
   before(:each) do
+    parent_test_guest = Class.new(Vagrant.plugin("2", :guest)) do
+      def detect?(machine)
+        true
+      end
+    end
+
     test_guest = Class.new(Vagrant.plugin("2", :guest)) do
       def detect?(machine)
         true
@@ -41,6 +48,7 @@ describe VagrantPlugins::CommandServe::Service::GuestService do
     end
 
     register_plugin do |p|
+      p.guest(:parent_test) { parent_test_guest }
       p.guest(:test, :parent_test) { test_guest }
     end
   end
@@ -60,9 +68,7 @@ describe VagrantPlugins::CommandServe::Service::GuestService do
       ctx = DummyContext.new("test")
       parents = subject.parents("", ctx)
       expect(parents).not_to be_nil
-      expect(parents.parents).to include("test")
       expect(parents.parents).to include("parent_test")
-
     end
   end