drupal_uninstall_modules in includes/install.inc
Uninstalls a given list of disabled modules.
module_enable in includes/module.inc
Enables or installs a given list of modules.
system_install in modules/system/system.install
Implements hook_install().
UpdateScriptFunctionalTest::testRequirements in modules/system/system.test
Tests that requirements warnings and errors are correctly displayed.
UpdateScriptFunctionalTest::testSuccessfulUpdateFunctionality in modules/system/system.test
Tests update.php after performing a successful update.
update_batch in includes/update.inc
Starts the database update batch process.
update_do_one in includes/update.inc
Implements callback_batch_operation().