farmOS/modules/farm/farm_map/farm_map.install

<?php
/**
 * @file
 * Farm map install.
 */

/**
 * Copy the Google Maps API key into the new configuration variable.
 */
function farm_map_update_7000(&$sandbox) {

  // Load the Google Hybrid source.
  $source = \Drupal\openlayers\Openlayers::load('Source', 'farm_map_source_google_hybrid');

  // If an API key is set, copy it to the variable.
  $key = $source->getOption('key');
  if (!empty($key)) {
    variable_set('farm_map_google_api_key', $key);
  }
}

/**
 * Delete the old farm_map_default_base_layer variable.
 */
function farm_map_update_7001(&$sandbox) {
  variable_del('farm_map_default_base_layer');
}

/**
 * Install new Google Maps module if an API key is saved.
 */
function farm_map_update_7002(&$sandbox) {
  $module = 'farm_map_google';
  if (variable_get('farm_map_google_api_key', FALSE) && !module_exists($module)) {
    module_enable(array($module));
  }
}

/**
 * Install new Mapbox module if an API key is saved.
 */
function farm_map_update_7003(&$sandbox) {
  $module = 'farm_map_mapbox';
  if (variable_get('farm_map_mapbox_api_key', FALSE) && !module_exists($module)) {
    module_enable(array($module));
  }
}

/**
 * Delete the old farm_map_show variable.
 */
function farm_map_update_7004(&$sandbox) {
  variable_del('farm_map_show');
}