drupal_install_fix_file in drupal-7.x/includes/install.inc

Attempts to fix file permissions.

drupal_install_mkdir in drupal-7.x/includes/install.inc

Creates a directory with the specified permissions.

drupal_verify_install_file in drupal-7.x/includes/install.inc

Verifies the state of the specified file.

install_check_requirements in drupal-7.x/includes/install.core.inc

Checks installation requirements and reports any errors.

install_configure_form in drupal-7.x/includes/install.core.inc

Form constructor for a form to configure the new site.

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