Index: includes/bootstrap.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/bootstrap.inc,v
retrieving revision 1.208
diff -u -p -r1.208 bootstrap.inc
--- includes/bootstrap.inc	14 Apr 2008 17:48:33 -0000	1.208
+++ includes/bootstrap.inc	23 Apr 2008 03:49:30 -0000
@@ -218,6 +218,19 @@ function timer_stop($name) {
  *
  * 13. $confdir/default
  *
+ * If a file named sites.php is present in the $confdir, it will be loaded
+ * prior to scanning for directories.  It should define an associative array
+ * named $sites, which maps domains to directories.  For example:
+ *
+ * $sites = array(
+ *   'example.com' => 'otherexample.com'
+ * );
+ *
+ * The above array will cause Drupal to look for a directory named
+ * "otherexample.com" whenever it would otherwise look for "example.com".
+ * That is useful on development servers, where the domain name may not be
+ * the same as the domain of the live server.
+ * 
  * @param $require_settings
  *   Only configuration directories with an existing settings.php file
  *   will be recognized. Defaults to TRUE. During initial installation,
@@ -237,11 +250,21 @@ function conf_path($require_settings = T
   }
 
   $confdir = 'sites';
+  
+  $sites = array();
+  if (file_exists($confdir . '/sites.php')) {
+    // This will overwrite $sites with the desired mappings.
+    include($confdir . '/sites.php');
+  }
+  
   $uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
   $server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
   for ($i = count($uri) - 1; $i > 0; $i--) {
     for ($j = count($server); $j > 0; $j--) {
       $dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
+      if (isset($sites[$dir]) && file_exists("$confdir/{$sites[$dir]}")) {
+        $dir = $sites[$dir];
+      }
       if (file_exists("$confdir/$dir/settings.php") || (!$require_settings && file_exists("$confdir/$dir"))) {
         $conf = "$confdir/$dir";
         return $conf;