drush_make.download.inc.patch

--- drush_make.download.inc.orig  2010-11-21 15:25:50.000000000 -0800
+++ drush_make.download.inc 2011-01-14 14:00:35.046868916 -0800
@@ -2,6 +2,14 @@
 // $Id: drush_make.download.inc,v 1.1.2.99 2010/11/21 23:25:50 dmitrig01 Exp $
 
 function drush_make_download_factory($name, $download, $download_location) {
+  static $done;
+  $type = $download['type'];
+  $done[$name][] = $type;
+  if ((count($done[$name]) > 1 && $name != 'awssdk') || (count($done[$name]) > 2 && $name == 'awssdk')) {
+    drush_log(dt('Attempt to download project %name more than once (%types) prevented',
+      array('%name' => $name, '%types' => join(", ", $done[$name]))), 'warning');
+    return FALSE;
+  }
   $function = 'drush_make_download_' . $download['type'];
   if (function_exists($function)) {
     return $function($name, $download, $download_location);