Only mount and do unison setup in the absense of error environments

lib/vagrant/action/vm/share_folders.rb

@@ -15,9 +15,13 @@ module Vagrant
 
           @app.call(env)
 
+          if !env.error?
+            # Only mount and setup shared folders in the absense of an
+            # error
             mount_shared_folders
             setup_unison
           end
+        end
 
         # This method returns an actual list of VirtualBox shared
         # folders to create and their proper path.

test/vagrant/action/vm/share_folders_test.rb

@@ -46,6 +46,19 @@ class ShareFoldersVMActionTest < Test::Unit::TestCase
 
       @instance.call(@env)
     end
+
+    should "run only the metadata actions if erroneous environment" do
+      @env.error!(:foo)
+
+      before_seq = sequence("before")
+      @instance.expects(:clear_shared_folders).once.in_sequence(before_seq)
+      @instance.expects(:create_metadata).once.in_sequence(before_seq)
+      @app.expects(:call).with(@env).in_sequence(before_seq)
+      @instance.expects(:mount_shared_folders).never
+      @instance.expects(:setup_unison).never
+
+      @instance.call(@env)
+    end
   end
 
   context "collecting shared folders" do