backdrop_uninstall_modules in core/includes/install.inc

Uninstalls a given list of disabled modules.

drupal_set_installed_schema_version in core/includes/drupal.inc

Update the installed version information for a module.

module_enable in core/includes/module.inc

Enables or installs a given list of modules.

system_install in core/modules/system/system.install

Implements hook_install().

UpdateDrupal7TestCase::testAvailableUpdates in core/modules/simpletest/tests/update.test

Tests that updates will be executed in the correct order.

UpdateScriptFunctionalTest::testRequirements in core/modules/system/tests/system.test

Tests that requirements warnings and errors are correctly displayed.

UpdateScriptFunctionalTest::testSuccessfulUpdateFunctionality in core/modules/system/tests/system.test

Tests update.php after performing a successful update.

update_batch in core/includes/update.inc

Starts the site update batch process.

update_do_one in core/includes/update.inc

Performs one update and stores the results for display on the results page.