constant REQUIRED_D7_SCHEMA_VERSION

Minimum schema version of Drupal 7 required for upgrade to Backdrop.

Upgrades from Drupal 7 to Backdrop require that Drupal 7 be running the most recent version, or the upgrade could fail. We can't check the Drupal 7 version once the update process has begun, so instead we check the schema version of system.module in the system table.

1 use of REQUIRED_D7_SCHEMA_VERSION

update_prepare_bootstrap in core/includes/update.inc: Performs extra steps required to bootstrap when using a Drupal 7 database.

File

core/includes/update.inc, line 18: Backdrop site update API.

Code

define('REQUIRED_D7_SCHEMA_VERSION', '7069')