commit 0a76e13645e990c48491c4c555fe9f7adcc1e552
Author: Ryan Davis <ryand-ruby@zenspider.com>
Date:   Sat Feb 7 05:41:57 2015 -0800

    - Fixed potential perms issue unpacking of gems on NFS. Fixes #1161

diff --git lib/rubygems/package.rb lib/rubygems/package.rb
index 417b34b..e8b8b38 100644
--- lib/rubygems/package.rb
+++ lib/rubygems/package.rb
@@ -366,8 +366,9 @@ EOM
 
         FileUtils.mkdir_p mkdir, mkdir_options
 
-        open destination, 'wb', entry.header.mode do |out|
+        open destination, 'wb' do |out|
           out.write entry.read
+          FileUtils.chmod entry.header.mode, destination
         end if entry.file?
 
         verbose destination