From ef44f196011ee5daf9f1bc3734b91b83dee18ff5 Mon Sep 17 00:00:00 2001
From: Matt Behrens <matt@zigg.com>
Date: Sun, 25 May 2014 18:42:40 -0400
Subject: [PATCH] drop `-r` flag from `xargs` on OS X

OS X's `xargs` does not support the `-r` flag (which means "do not
execute the command even once if there are no arguments"), but
behaves by default as if it was specified.

You can verify this yourself with this test:

    $ touch zero-length-file
    $ xargs echo <zero-length-file

If `echo` is executed, you will see a blank line.  If it is not
executed (i.e. `-r` is specified or the behavior is implied) then
you will see no blank line.
---
 plugins/guests/darwin/cap/rsync.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/guests/darwin/cap/rsync.rb b/plugins/guests/darwin/cap/rsync.rb
index f8cdc2e3e..e98d6e5ae 100644
--- a/plugins/guests/darwin/cap/rsync.rb
+++ b/plugins/guests/darwin/cap/rsync.rb
@@ -23,7 +23,7 @@ module VagrantPlugins
 
           machine.communicate.sudo(
             "find '#{opts[:guestpath]}' '(' ! -user #{opts[:owner]} -or ! -group #{opts[:group]} ')' -print0 | " +
-            "xargs -0 -r chown #{opts[:owner]}:#{opts[:group]}")
+            "xargs -0 chown #{opts[:owner]}:#{opts[:group]}")
         end
       end
     end