Issue #3118730 by andypost, daffie, catch, xjm: Explicitly test for pg_trgm extention in installer

<?php

/**

 * @file

 * Install, update and uninstall functions for the pgsql module.

 */

use Drupal\Core\Database\Database;

/**

 * Implements hook_requirements().

 */

function pgsql_requirements() {

  $requirements = [];

  // Test with PostgreSQL databases for the status of the pg_trgm extension.

  if (Database::isActiveConnection()) {

    $connection = Database::getConnection();

    // Set the requirement just for postgres.

    if ($connection->driver() == 'pgsql') {

      $requirements['pgsql_extension_pg_trgm'] = [

        'severity' => REQUIREMENT_OK,

        'title' => t('PostgreSQL pg_trgm extension'),

        'value' => t('Available'),

        'description' => 'The pg_trgm PostgreSQL extension is present.',

      ];

      // If the extension is not available, set the requirement error.

      if (!$connection->schema()->extensionExists('pg_trgm')) {

        $requirements['pgsql_extension_pg_trgm']['severity'] = REQUIREMENT_ERROR;

        $requirements['pgsql_extension_pg_trgm']['value'] = t('Not created');

        $requirements['pgsql_extension_pg_trgm']['description'] = t('The <a href=":pg_trgm">pg_trgm</a> PostgreSQL extension is not present. The extension is required by Drupal 10 to improve performance when using PostgreSQL. See <a href=":requirements">Drupal database server requirements</a> for more information.', [

          ':pg_trgm' => 'https://www.postgresql.org/docs/current/pgtrgm.html',

          ':requirements' => 'https://www.drupal.org/docs/system-requirements/database-server-requirements',

        ]);

      }

    }

  }

  return $requirements;

}

    }

  }

  // Test with PostgreSQL databases for the status of the pg_trgm extension.

  if ($phase === 'runtime' || $phase === 'update') {

    if (Database::isActiveConnection()) {

      $connection = Database::getConnection();

      // Set the requirement just for postgres.

      if ($connection->driver() == 'pgsql') {

        $requirements['pgsql_extension_pg_trgm'] = [

          'severity' => REQUIREMENT_OK,

          'title' => t('PostgreSQL pg_trgm extension'),

          'value' => t('Available'),

          'description' => 'The pg_trgm PostgreSQL extension is present.',

        ];

        // If the extension is not available, set the requirement error.

        if (!$connection->schema()->extensionExists('pg_trgm')) {

          $requirements['pgsql_extension_pg_trgm']['severity'] = REQUIREMENT_ERROR;

          $requirements['pgsql_extension_pg_trgm']['value'] = t('Not created');

          $requirements['pgsql_extension_pg_trgm']['description'] = t('The <a href=":pg_trgm">pg_trgm</a> PostgreSQL extension is not present. The extension is required by Drupal 10 to improve performance when using PostgreSQL. See <a href=":requirements">Drupal database server requirements</a> for more information.', [

            ':pg_trgm' => 'https://www.postgresql.org/docs/current/pgtrgm.html',

            ':requirements' => 'https://www.drupal.org/docs/system-requirements/database-server-requirements',

          ]);

        }

      }

    }

  }

  if ($phase === 'runtime' || $phase === 'update') {

    // Test database JSON support.

    $requirements['database_support_json'] = [