FILE_EXIST

drupal_verify_install_file in core/includes/install.inc

Verifies the state of the specified file.

install_check_requirements in core/includes/install.core.inc

Checks installation requirements and reports any errors.

install_check_translations in core/includes/install.core.inc

Checks installation requirements and reports any errors.

SiteConfigureForm::buildForm in core/lib/Drupal/Core/Installer/Form/SiteConfigureForm.php

SitesDirectoryHardeningTest::testSitesDirectoryHardening in core/modules/system/tests/src/Functional/System/SitesDirectoryHardeningTest.php

Tests the default behavior to restrict directory permissions is enforced.

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