FILE_NOT_WRITABLE

drupal_install_fix_file in core/includes/install.inc

Attempts to fix file permissions.

drupal_install_mkdir in core/includes/install.inc

Creates a directory with the specified permissions.

drupal_verify_install_file in core/includes/install.inc

Verifies the state of the specified file.

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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