Remove tmpdir after rsync completes

plugins/synced_folders/rsync/helper.rb

@@ -1,3 +1,4 @@
+require "fileutils"
 require "ipaddr"
 require "shellwords"
 require "tmpdir"
@@ -232,6 +233,8 @@ module VagrantPlugins
               message: err.to_s
           end
         end
+      ensure
+        FileUtils.remove_entry_secure(controlpath) if controlpath
       end
 
       # Check if rsync versions support using chown option

test/unit/plugins/synced_folders/rsync/helper_test.rb

@@ -293,6 +293,10 @@ describe VagrantPlugins::SyncedFolderRSync::RsyncHelper do
         }.and_return(result)
 
         subject.rsync_single(machine, ssh_info, opts)
+
+        unless Vagrant::Util::Platform.windows?
+          expect(File.exist?("/tmp/vagrant-rsync-12345")).to be_falsey
+        end
       end
     end
   end