try to use transactions to replace db

apps/admin_export/settings.php

@@ -28,7 +28,7 @@ OC_Util::checkAppEnabled('admin_export');
 // Export?
 if (isset($_POST['admin_export'])) {
 	// Create the export zip
-	if( !$path = OC_Migrate::export( $_POST['export_type'] ) ){
+	if( !$path = OC_Migrate::export( null, $_POST['export_type'] ) ){
 		// Error
 		die('error');	
 	} else {

lib/db.php

@@ -489,7 +489,7 @@ class OC_DB {
 	 public static function replaceDB( $file ){
 	 	
 	 	$apps = OC_App::getAllApps();
-	 	
+	 	self::beginTransaction();
 	 	// Delete the old tables
 	 	self::removeDBStructure( OC::$SERVERROOT . '/db_structure.xml' );
 	 	
@@ -501,11 +501,8 @@ class OC_DB {
 	 	}
 	 	
 	 	// Create new tables
-	 	if( self::createDBFromStructure( $file ) ){
-	 		return true;
-	 	} else {
-	 		return false;	
-	 	}
+	 	self::createDBFromStructure( $file );
+	 	self::commit();
 	 	
 	 }
 	

lib/migrate.php

@@ -257,28 +257,30 @@ class OC_Migrate{
 				return $appsimported;
 			break;
 			case 'instance':
+					/*
 					// Check for new data dir and dbexport before doing anything
 					// TODO
-					/*
+					
 					// Delete current data folder.
 					OC_Log::write( 'migration', "Deleting current data dir", OC_Log::INFO );
-					if( self::unlink_r( $datadir, false ) ){
+					if( !self::unlink_r( $datadir, false ) ){
 						OC_Log::write( 'migration', 'Failed to delete the current data dir', OC_Log::ERROR );
 						return false;	
 					}
 				
 					// Copy over data
-					if( !self::copy_r( $extractname . 'data', $datadir ) ){
+					if( !self::copy_r( $extractpath . 'userdata', $datadir ) ){
 						OC_Log::write( 'migration', 'Failed to copy over data directory', OC_Log::ERROR );
 						return false;	
 					}
-					*/
+					
 					// Import the db
 					if( !OC_DB::replaceDB( $extractpath . 'dbexport.xml' ) ){
 						return false;	
 					}
 					// Done
 					return true; 
+					*/
 			break;	
 		}