acquia / df

    if ($rollback == TRUE) {

      // Queue migrations to rollback in the opposite order provided.

      foreach (array_reverse($migrations[$scenario]) as $machine_name) {

        migrate_static_registration(array($machine_name));

        $migration = Migration::getInstance($machine_name);

        $operations[] = array('migrate_ui_batch', array('rollback', $machine_name, array('unit' => 'items', 'value' => ''), FALSE));

      }

    }

    // Queue migrations to import in the provided order.

    }

    // Queue migrations to import in the provided order.

    foreach ($migrations[$scenario]  as $machine_name) {

      migrate_static_registration(array($machine_name));

      $migration = Migration::getInstance($machine_name);

      $operations[] = array('migrate_ui_batch', array('import', $machine_name, array('unit' => 'items', 'value' => ''), FALSE));

    }

    // Confirm if there was an attempt to run scenario migrations.

    $migrations_count = count($migrations[$scenario]);

    $migrations = module_invoke_all('df_import');

    drupal_alter('df_import', $migrations);

    $operations = array();

    foreach (array_reverse($migrations[$scenario]) as $machine_name) {

      migrate_static_registration(array($machine_name));

      $operations[] = array('migrate_ui_batch', array('rollback', $machine_name, array('unit' => 'items', 'value' => ''), FALSE));

    }

    $batch = array(

      'operations' => $operations,

      'title' => t('Sub-scenario base scenario rollback.'),

  // Check for available migrations based on the scenario.

  if (isset($migrations[$scenario]) && !empty($migrations[$scenario])) {

    // Queue migrations to rollback in the opposite order provided.

    foreach (array_reverse($migrations[$scenario]) as $machine_name) {

      migrate_static_registration(array($machine_name));

      $operations[] = array('migrate_ui_batch', array('rollback', $machine_name, array('unit' => 'items', 'value' => ''), FALSE));

    }

  }

  // Uninstall features and the scenario.