system.install

<?php
// $Id$

/**
 * Test and report Drupal installation requirements.
 *
 * @param $phase
 *   The current system installation phase.
 * @return
 *   An array of system requirements.
 */
function system_requirements($phase) {
  $requirements = array();
  // Ensure translations don't break at install time
  $t = get_t();

  // Report Drupal version
  if ($phase == 'runtime') {
    $requirements['drupal'] = array(
      'title' => $t('Drupal'),
      'value' => VERSION,
      'severity' => REQUIREMENT_INFO,
      'weight' => -10,
    );
  }

  // Test web server
  $software = $_SERVER['SERVER_SOFTWARE'];
  $requirements['webserver'] = array(
    'title' => $t('Web server'),
    'value' => $software,
  );
  // Use server info string, if present.
  if ($software && preg_match('![0-9]!', $software)) {
    list($server, $version) = split('[ /]', $software);
    switch ($server) {
      case 'Apache':
        if (version_compare($version, DRUPAL_MINIMUM_APACHE) < 0) {
          $requirements['webserver']['description'] = $t('Your Apache server is too old. Drupal requires at least Apache %version.', array('%version' => DRUPAL_MINIMUM_APACHE));
          $requirements['webserver']['severity'] = REQUIREMENT_ERROR;
        }
        break;

      default:
        $requirements['webserver']['description'] = $t('The web server you\'re using has not been tested with Drupal and might not work properly.');
        $requirements['webserver']['severity'] = REQUIREMENT_WARNING;
        break;
    }
  }
  else {
    $requirements['webserver']['value'] = $software ? $software : $t('Unknown');
    $requirements['webserver']['description'] = $t('Unable to determine your web server type and version. Drupal might not work properly.');
    $requirements['webserver']['severity'] = REQUIREMENT_WARNING;
  }

  // Test PHP version
  $requirements['php'] = array(
    'title' => $t('PHP'),
    'value' => ($phase == 'runtime') ? l(phpversion(), 'admin/reports/status/php') : phpversion(),
  );
  if (version_compare(phpversion(), DRUPAL_MINIMUM_PHP) < 0) {
    $requirements['php']['description'] = $t('Your PHP installation is too old. Drupal requires at least PHP %version.', array('%version' => DRUPAL_MINIMUM_PHP));
    $requirements['php']['severity'] = REQUIREMENT_ERROR;
  }

  // Test DB version
  global $db_type;
  if (function_exists('db_status_report')) {
    $requirements += db_status_report($phase);
  }

  // Test settings.php file writability
  if ($phase == 'runtime') {
    $conf_dir = drupal_verify_install_file(conf_path(), FILE_NOT_WRITABLE, 'dir');
    $conf_file = drupal_verify_install_file(conf_path() .'/settings.php', FILE_EXIST|FILE_READABLE|FILE_NOT_WRITABLE);
    if (!$conf_dir || !$conf_file) {
      $requirements['settings.php'] = array(
        'value' => $t('Not protected'),
        'severity' => REQUIREMENT_ERROR,
        'description' => '',
      );
      if (!$conf_dir) {
        $requirements['settings.php']['description'] .= $t('The directory %file is not protected from modifications and poses a security risk. You must change the directory\'s permissions to be non-writable. ', array('%file' => conf_path()));
      }
      if (!$conf_file) {
        $requirements['settings.php']['description'] .= $t('The file %file is not protected from modifications and poses a security risk. You must change the file\'s permissions to be non-writable.', array('%file' => conf_path() .'/settings.php'));
      }
    }
    else {
      $requirements['settings.php'] = array(
        'value' => $t('Protected'),
      );
    }
    $requirements['settings.php']['title'] = $t('Configuration file');
  }

  // Report cron status.
  if ($phase == 'runtime') {
    // Cron warning threshold defaults to two days.
    $threshold_warning = variable_get('cron_threshold_warning', 172800);
    // Cron error threshold defaults to two weeks.
    $threshold_error = variable_get('cron_threshold_error', 1209600);
    // Cron configuration help text.
    $help = $t('For more information, see the online handbook entry for <a href="@cron-handbook">configuring cron jobs</a>.', array('@cron-handbook' => 'http://drupal.org/cron'));

    // Determine when cron last ran. If never, use the install time to
    // determine the warning or error status.
    $cron_last = variable_get('cron_last', NULL);
    $never_run = FALSE;
    if (!is_numeric($cron_last)) {
      $never_run = TRUE;
      $cron_last = variable_get('install_time', 0);
    }

    // Determine severity based on time since cron last ran.
    $severity = REQUIREMENT_OK;
    if (time() - $cron_last > $threshold_error) {
      $severity = REQUIREMENT_ERROR;
    }
    else if ($never_run || (time() - $cron_last > $threshold_warning)) {
      $severity = REQUIREMENT_WARNING;
    }

    // If cron hasn't been run, and the user is viewing the main
    // administration page, instead of an error, we display a helpful reminder
    // to configure cron jobs.
    if ($never_run && $severity != REQUIREMENT_ERROR && $_GET['q'] == 'admin' && user_access('administer site configuration')) {
      drupal_set_message($t('Cron has not run. Please visit the <a href="@status">status report</a> for more information.', array('@status' => url('admin/reports/status'))));
    }

    // Set summary and description based on values determined above.
    if ($never_run) {
      $summary = $t('Never run');
      $description = $t('Cron has not run.') .' '. $help;
    }
    else {
      $summary = $t('Last run !time ago', array('!time' => format_interval(time() - $cron_last)));
      $description = '';
      if ($severity != REQUIREMENT_OK) {
        $description = $t('Cron has not run recently.') .' '. $help;
      }
    }

    $requirements['cron'] = array(
      'title' => $t('Cron maintenance tasks'),
      'severity' => $severity,
      'value' => $summary,
      'description' => $description .' '. $t('You can <a href="@cron">run cron manually</a>.', array('@cron' => url('admin/reports/status/run-cron'))),
    );
  }

  // Test files directory
  $directory = file_directory_path();

  // For installer, create the directory if possible.
  if ($phase == 'install' && !is_dir($directory) && @mkdir($directory)) {
    @chmod($directory, 0775); // Necessary for non-webserver users.
  }

  $is_writable = is_writable($directory);
  $is_directory = is_dir($directory);
  if (!$is_writable || !$is_directory) {
    if (!$is_directory) {
      $error = $t('The directory %directory does not exist.', array('%directory' => $directory));
    }
    else {
      $error = $t('The directory %directory is not writable.', array('%directory' => $directory));
    }
    $requirements['file system'] = array(
      'value' => $t('Not writable'),
      'severity' => REQUIREMENT_ERROR,
    );
    if ($phase == 'runtime') {
      $requirements['file system']['description'] = $error .' '. $t('You may need to set the correct directory at the <a href="@admin-file-system">file system settings page</a> or change the current directory\'s permissions so that it is writable.', array('@admin-file-system' => url('admin/settings/file-system')));
    }
    else if ($phase == 'install') {
      // For the installer UI, we need different wording. 'value' will
      // be treated as version, so provide none there.
      $requirements['file system']['description'] = $error .' '. $t('An automated attempt to create this directory failed, possibly due to a permissions problem. To proceed with the installation, either create the directory and modify its permissions manually, or ensure that the installer has the permissions to create it automatically. For more information, please see INSTALL.txt or the <a href="@handbook_url">on-line handbook</a>.', array('@handbook_url' => 'http://drupal.org/server-permissions'));
      $requirements['file system']['value'] = '';
    }
  }
  else {
    if (variable_get('file_downloads', FILE_DOWNLOADS_PUBLIC) == FILE_DOWNLOADS_PUBLIC) {
      $requirements['file system']['value'] = $t('Writable (<em>public</em> download method)');
    }
    else {
      $requirements['file system']['value'] = $t('Writable (<em>private</em> download method)');
    }
  }
  $requirements['file system']['title'] = $t('File system');

  // See if updates are available in update.php.
  if ($phase == 'runtime') {
    $requirements['update'] = array(
      'title' => $t('Database updates'),
      'severity' => REQUIREMENT_OK,
      'value' => $t('Up to date'),
    );

    // Check installed modules.
    foreach (module_list() as $module) {
      $updates = drupal_get_schema_versions($module);
      if ($updates !== FALSE) {
        $default = drupal_get_installed_schema_version($module);
        if (max($updates) > $default) {
          $requirements['update']['severity'] = REQUIREMENT_ERROR;
          $requirements['update']['value'] = $t('Out of date');
          $requirements['update']['description'] = $t('Some modules have database schema updates to install. You should run the <a href="@update">database update script</a> immediately.', array('@update' => base_path() .'update.php'));
          break;
        }
      }
    }
  }

  // Verify the update.php access setting
  if ($phase == 'runtime') {
    if (!empty($GLOBALS['update_free_access'])) {
      $requirements['update access'] = array(
        'value' => $t('Not protected'),
        'severity' => REQUIREMENT_ERROR,
        'description' => $t('The update.php script is accessible to everyone without authentication check, which is a security risk. You must change the $update_free_access value in your settings.php back to FALSE.'),
      );
    }
    else {
      $requirements['update access'] = array(
        'value' => $t('Protected'),
      );
    }
    $requirements['update access']['title'] = $t('Access to update.php');
  }

  // Test Unicode library
  include_once './includes/unicode.inc';
  $requirements = array_merge($requirements, unicode_requirements());

  // Check for update status module.
  if ($phase == 'runtime') {
    if (!module_exists('update')) {
      $requirements['update status'] = array(
        'value' => $t('Not enabled'),
        'severity' => REQUIREMENT_ERROR,
        'description' => $t('Update notifications are not enabled. It is <strong>highly recommended</strong> that you enable the update status module from the <a href="@module">module administration page</a> in order to stay up-to-date on new releases. For more information please read the <a href="@update">Update status handbook page</a>.', array('@update' => 'http://drupal.org/handbook/modules/update', '@module' => url('admin/build/modules'))),
      );
    }
    else {
      $requirements['update status'] = array(
        'value' => $t('Enabled'),
      );
      if (variable_get('drupal_http_request_fails', FALSE)) {
        $requirements['http requests'] = array(
          'title' => $t('HTTP request status'),
          'value' => $t('Fails'),
          'severity' => REQUIREMENT_ERROR,
          'description' => $t('Your system or network configuration does not allow Drupal to access web pages, resulting in reduced functionality. This could be due to your webserver configuration or PHP settings, and should be resolved in order to download information about available updates, fetch aggregator feeds, sign in via OpenID, or use other network-dependent services.'),
        );
      }
    }
    $requirements['update status']['title'] = $t('Update notifications');
  }

  return $requirements;
}

/**
 * Implementation of hook_install().
 */
function system_install() {
  if ($GLOBALS['db_type'] == 'pgsql') {
    // Create unsigned types.
    db_query("CREATE DOMAIN int_unsigned integer CHECK (VALUE >= 0)");
    db_query("CREATE DOMAIN smallint_unsigned smallint CHECK (VALUE >= 0)");
    db_query("CREATE DOMAIN bigint_unsigned bigint CHECK (VALUE >= 0)");

    // Create functions.
    db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric) RETURNS numeric AS
      \'SELECT CASE WHEN (($1 > $2) OR ($2 IS NULL)) THEN $1 ELSE $2 END;\'
      LANGUAGE \'sql\''
    );
    db_query('CREATE OR REPLACE FUNCTION "greatest"(numeric, numeric, numeric) RETURNS numeric AS
      \'SELECT greatest($1, greatest($2, $3));\'
      LANGUAGE \'sql\''
    );
    if (!db_result(db_query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'rand'"))) {
      db_query('CREATE OR REPLACE FUNCTION "rand"() RETURNS float AS
        \'SELECT random();\'
        LANGUAGE \'sql\''
      );
    }

    if (!db_result(db_query("SELECT COUNT(*) FROM pg_proc WHERE proname = 'concat'"))) {
      db_query('CREATE OR REPLACE FUNCTION "concat"(text, text) RETURNS text AS
        \'SELECT $1 || $2;\'
        LANGUAGE \'sql\''
      );
    }
    db_query('CREATE OR REPLACE FUNCTION "if"(boolean, text, text) RETURNS text AS
      \'SELECT CASE WHEN $1 THEN $2 ELSE $3 END;\'
      LANGUAGE \'sql\''
    );
    db_query('CREATE OR REPLACE FUNCTION "if"(boolean, integer, integer) RETURNS integer AS
      \'SELECT CASE WHEN $1 THEN $2 ELSE $3 END;\'
      LANGUAGE \'sql\''
    );
  }

  // Create tables.
  $modules = array('system', 'filter', 'block', 'user', 'node', 'comment', 'taxonomy');
  foreach ($modules as $module) {
    drupal_install_schema($module);
  }

  // Load system theme data appropriately.
  system_theme_data();

  // Inserting uid 0 here confuses MySQL -- the next user might be created as
  // uid 2 which is not what we want. So we insert the first user here, the
  // anonymous user. uid is 1 here for now, but very soon it will be changed
  // to 0.
  db_query("INSERT INTO {users} (name, mail) VALUES('%s', '%s')", '', '');
  // We need some placeholders here as name and mail are uniques and data is
  // presumed to be a serialized array. Install will change uid 1 immediately
  // anyways. So we insert the superuser here, the uid is 2 here for now, but
  // very soon it will be changed to 1.
  db_query("INSERT INTO {users} (name, mail, created, data) VALUES('%s', '%s', %d, '%s')", 'placeholder-for-uid-1', 'placeholder-for-uid-1', time(), serialize(array()));
  // This sets the above two users uid 0 (anonymous). We avoid an explicit 0
  // otherwise MySQL might insert the next auto_increment value.
  db_query("UPDATE {users} SET uid = uid - uid WHERE name = '%s'", '');
  // This sets uid 1 (superuser). We skip uid 2 but that's not a big problem.
  db_query("UPDATE {users} SET uid = 1 WHERE name = '%s'", 'placeholder-for-uid-1');

  db_query("INSERT INTO {role} (name) VALUES ('%s')", 'anonymous user');
  db_query("INSERT INTO {role} (name) VALUES ('%s')", 'authenticated user');

  db_query("INSERT INTO {permission} (rid, perm, tid) VALUES (%d, '%s', %d)", 1, 'access content', 0);
  db_query("INSERT INTO {permission} (rid, perm, tid) VALUES (%d, '%s', %d)", 2, 'access comments, access content, post comments, post comments without approval', 0);

  db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", 'theme_default', 's:7:"garland";');
  db_query("UPDATE {system} SET status = %d WHERE type = '%s' AND name = '%s'", 1, 'theme', 'garland');
  db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s')", 'user', '0', 'garland', 1, 0, 'left', '');
  db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s')", 'user', '1', 'garland', 1, 0, 'left', '');
  db_query("INSERT INTO {blocks} (module, delta, theme, status, weight, region, pages) VALUES ('%s', '%s', '%s', %d, %d, '%s', '%s')", 'system', '0', 'garland', 1, 10, 'footer', '');

  db_query("INSERT INTO {node_access} (nid, gid, realm, grant_view, grant_update, grant_delete) VALUES (%d, %d, '%s', %d, %d, %d)", 0, 0, 'all', 1, 0, 0);

  // Add input formats.
  db_query("INSERT INTO {filter_formats} (name, roles, cache) VALUES ('%s', '%s', %d)", 'Filtered HTML', ',1,2,', 1);
  db_query("INSERT INTO {filter_formats} (name, roles, cache) VALUES ('%s', '%s', %d)", 'Full HTML', '', 1);

  // Enable filters for each input format.

  // Filtered HTML:
  // URL filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 1, 'filter', 2, 0);
  // HTML filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 1, 'filter', 0, 1);
  // Line break filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 1, 'filter', 1, 2);
  // HTML corrector filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 1, 'filter', 3, 10);

  // Full HTML:
  // URL filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 2, 'filter', 2, 0);
  // Line break filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 2, 'filter', 1, 1);
  // HTML corrector filter.
  db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", 2, 'filter', 3, 10);

  db_query("INSERT INTO {variable} (name, value) VALUES ('%s','%s')", 'filter_html_1', 'i:1;');

  db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", 'node_options_forum', 'a:1:{i:0;s:6:"status";}');
}

/**
 * Implementation of hook_schema().
 */
function system_schema() {
  // NOTE: {variable} needs to be created before all other tables, as
  // some database drivers, e.g. Oracle and DB2, will require variable_get()
  // and variable_set() for overcoming some database specific limitations.
  $schema['variable'] = array(
    'description' => t('Named variable/value pairs created by Drupal core or any other module or theme. All variables are cached in memory at the start of every Drupal request so developers should not be careless about what is stored here.'),
    'fields' => array(
      'name' => array(
        'description' => t('The name of the variable.'),
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => ''),
      'value' => array(
        'description' => t('The value of the variable.'),
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'big'),
      ),
    'primary key' => array('name'),
    );

  $schema['actions'] = array(
    'description' => t('Stores action information.'),
    'fields' => array(
      'aid' => array(
        'description' => t('Primary Key: Unique actions ID.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '0'),
      'type' => array(
        'description' => t('The object that that action acts on (node, user, comment, system or custom types.)'),
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => ''),
      'callback' => array(
        'description' => t('The callback function that executes when the action runs.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'parameters' => array(
        'description' => t('Parameters to be passed to the callback function.'),
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'big'),
      'description' => array(
        'description' => t('Description of the action.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '0'),
      ),
    'primary key' => array('aid'),
    );

  $schema['actions_aid'] = array(
    'description' => t('Stores action IDs for non-default actions.'),
    'fields' => array(
      'aid' => array(
        'description' => t('Primary Key: Unique actions ID.'),
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE),
      ),
    'primary key' => array('aid'),
    );

  $schema['batch'] = array(
    'description' => t('Stores details about batches (processes that run in multiple HTTP requests).'),
    'fields' => array(
      'bid' => array(
        'description' => t('Primary Key: Unique batch ID.'),
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE),
      'token' => array(
        'description' => t("A string token generated against the current user's session id and the batch id, used to ensure that only the user who submitted the batch can effectively access it."),
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE),
      'timestamp' => array(
        'description' => t('A Unix timestamp indicating when this batch was submitted for processing. Stale batches are purged at cron time.'),
        'type' => 'int',
        'not null' => TRUE),
      'batch' => array(
        'description' => t('A serialized array containing the processing data for the batch.'),
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big')
      ),
    'primary key' => array('bid'),
    'indexes' => array('token' => array('token')),
    );

  $schema['cache'] = array(
    'description' => t('Generic cache table for caching things not separated out into their own tables. Contributed modules may also use this to store cached items.'),
    'fields' => array(
      'cid' => array(
        'description' => t('Primary Key: Unique cache ID.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'data' => array(
        'description' => t('A collection of data to cache.'),
        'type' => 'blob',
        'not null' => FALSE,
        'size' => 'big'),
      'expire' => array(
        'description' => t('A Unix timestamp indicating when the cache entry should expire, or 0 for never.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'created' => array(
        'description' => t('A Unix timestamp indicating when the cache entry was created.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'headers' => array(
        'description' => t('Any custom HTTP headers to be added to cached data.'),
        'type' => 'text',
        'not null' => FALSE),
      'serialized' => array(
        'description' => t('A flag to indicate whether content is serialized (1) or not (0).'),
        'type' => 'int',
        'size' => 'small',
        'not null' => TRUE,
        'default' => 0)
      ),
    'indexes' => array('expire' => array('expire')),
    'primary key' => array('cid'),
    );

  $schema['cache_form'] = $schema['cache'];
  $schema['cache_form']['description'] = t('Cache table for the form system to store recently built forms and their storage data, to be used in subsequent page requests.');
  $schema['cache_page'] = $schema['cache'];
  $schema['cache_page']['description'] = t('Cache table used to store compressed pages for anonymous users, if page caching is enabled.');
  $schema['cache_menu'] = $schema['cache'];
  $schema['cache_menu']['description'] = t('Cache table for the menu system to store router information as well as generated link trees for various menu/page/user combinations.');

  $schema['files'] = array(
    'description' => t('Stores information for uploaded files.'),
    'fields' => array(
      'fid' => array(
        'description' => t('Primary Key: Unique files ID.'),
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE),
      'uid' => array(
        'description' => t('The {users}.uid of the user who is associated with the file.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'filename' => array(
        'description' => t('Name of the file.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'filepath' => array(
        'description' => t('Path of the file relative to Drupal root.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'filemime' => array(
        'description' => t('The file MIME type.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'filesize' => array(
        'description' => t('The size of the file in bytes.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'status' => array(
        'description' => t('A flag indicating whether file is temporary (1) or permanent (0).'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'timestamp' => array(
        'description' => t('UNIX timestamp for when the file was added.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      ),
    'indexes' => array(
      'uid' => array('uid'),
      'status' => array('status'),
      'timestamp' => array('timestamp'),
      ),
    'primary key' => array('fid'),
    );

  $schema['flood'] = array(
    'description' => t('Flood controls the threshold of events, such as the number of contact attempts.'),
    'fields' => array(
      'fid' => array(
        'description' => t('Unique flood event ID.'),
        'type' => 'serial',
        'not null' => TRUE),
      'event' => array(
        'description' => t('Name of event (e.g. contact).'),
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => ''),
      'hostname' => array(
        'description' => t('Hostname of the visitor.'),
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => ''),
      'timestamp' => array(
        'description' => t('Timestamp of the event.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0)
      ),
    'primary key' => array('fid'),
    'indexes' => array(
      'allow' => array('event', 'hostname', 'timestamp'),
    ),
    );

  $schema['history'] = array(
    'description' => t('A record of which {users} have read which {node}s.'),
    'fields' => array(
      'uid' => array(
        'description' => t('The {users}.uid that read the {node} nid.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'nid' => array(
        'description' => t('The {node}.nid that was read.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'timestamp' => array(
        'description' => t('The Unix timestamp at which the read occurred.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0)
      ),
    'primary key' => array('uid', 'nid'),
    'indexes' => array(
      'nid' => array('nid'),
    ),
    );
  $schema['menu_router'] = array(
    'description' => t('Maps paths to various callbacks (access, page and title)'),
    'fields' => array(
      'path' => array(
        'description' => t('Primary Key: the Drupal path this entry describes'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'load_functions' => array(
        'description' => t('A serialized array of function names (like node_load) to be called to load an object corresponding to a part of the current path.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'to_arg_functions' => array(
        'description' => t('A serialized array of function names (like user_current_to_arg) to be called to replace a part of the router path with another string.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'access_callback' => array(
        'description' => t('The callback which determines the access to this router path. Defaults to user_access.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'access_arguments' => array(
        'description' => t('A serialized array of arguments for the access callback.'),
        'type' => 'text',
        'not null' => FALSE),
      'page_callback' => array(
        'description' => t('The name of the function that renders the page.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'page_arguments' => array(
        'description' => t('A serialized array of arguments for the page callback.'),
        'type' => 'text',
        'not null' => FALSE),
      'fit' => array(
        'description' => t('A numeric representation of how specific the path is.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'number_parts' => array(
        'description' => t('Number of parts in this router path.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'tab_parent' => array(
        'description' => t('Only for local tasks (tabs) - the router path of the parent page (which may also be a local task).'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'tab_root' => array(
        'description' => t('Router path of the closest non-tab parent page. For pages that are not local tasks, this will be the same as the path.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'title' => array(
        'description' => t('The title for the current page, or the title for the tab if this is a local task.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'title_callback' => array(
        'description' => t('A function which will alter the title. Defaults to t()'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'title_arguments' => array(
        'description' => t('A serialized array of arguments for the title callback. If empty, the title will be used as the sole argument for the title callback.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'type' => array(
        'description' => t('Numeric representation of the type of the menu item, like MENU_LOCAL_TASK.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'block_callback' => array(
        'description' => t('Name of a function used to render the block on the system administration page for this item.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'description' => array(
        'description' => t('A description of this item.'),
        'type' => 'text',
        'not null' => TRUE),
      'position' => array(
        'description' => t('The position of the block (left or right) on the system administration page for this item.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'weight' => array(
        'description' => t('Weight of the element. Lighter weights are higher up, heavier weights go down.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'file' => array(
        'description' => t('The file to include for this element, usually the page callback function lives in this file.'),
        'type' => 'text',
        'size' => 'medium')
      ),
    'indexes' => array(
      'fit' => array('fit'),
      'tab_parent' => array('tab_parent')
      ),
    'primary key' => array('path'),
    );

  $schema['menu_links'] = array(
    'description' => t('Contains the individual links within a menu.'),
    'fields' => array(
     'menu_name' => array(
        'description' => t("The menu name. All links with the same menu name (such as 'navigation') are part of the same menu."),
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => ''),
      'mlid' => array(
        'description' => t('The menu link ID (mlid) is the integer primary key.'),
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE),
      'plid' => array(
        'description' => t('The parent link ID (plid) is the mlid of the link above in the hierarchy, or zero if the link is at the top level in its menu.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'link_path' => array(
        'description' => t('The Drupal path or external path this link points to.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'router_path' => array(
        'description' => t('For links corresponding to a Drupal path (external = 0), this connects the link to a {menu_router}.path for joins.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'link_title' => array(
      'description' => t('The text displayed for the link, which may be modified by a title callback stored in {menu_router}.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'options' => array(
        'description' => t('A serialized array of options to be passed to the url() or l() function, such as a query string or HTML attributes.'),
        'type' => 'text',
        'not null' => FALSE),
      'module' => array(
        'description' => t('The name of the module that generated this link.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => 'system'),
      'hidden' => array(
        'description' => t('A flag for whether the link should be rendered in menus. (1 = a disabled menu item that may be shown on admin screens, -1 = a menu callback, 0 = a normal, visible link)'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'external' => array(
        'description' => t('A flag to indicate if the link points to a full URL starting with a protocol, like http:// (1 = external, 0 = internal).'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'has_children' => array(
        'description' => t('Flag indicating whether any links have this link as a parent (1 = children exist, 0 = no children).'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'expanded' => array(
        'description' => t('Flag for whether this link should be rendered as expanded in menus - expanded links always have their child links displayed, instead of only when the link is in the active trail (1 = expanded, 0 = not expanded)'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'weight' => array(
        'description' => t('Link weight among links in the same menu at the same depth.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'depth' => array(
        'description' => t('The depth relative to the top level. A link with plid == 0 will have depth == 1.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'customized' => array(
        'description' => t('A flag to indicate that the user has manually created or edited the link (1 = customized, 0 = not customized).'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      'p1' => array(
        'description' => t('The first mlid in the materialized path. If N = depth, then pN must equal the mlid. If depth > 1 then p(N-1) must equal the plid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p2' => array(
        'description' => t('The second mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p3' => array(
        'description' => t('The third mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p4' => array(
        'description' => t('The fourth mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p5' => array(
        'description' => t('The fifth mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p6' => array(
        'description' => t('The sixth mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p7' => array(
        'description' => t('The seventh mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p8' => array(
        'description' => t('The eighth mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'p9' => array(
        'description' => t('The ninth mlid in the materialized path. See p1.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0),
      'updated' => array(
        'description' => t('Flag that indicates that this link was generated during the update from Drupal 5.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'small'),
      ),
    'indexes' => array(
      'path_menu' => array(array('link_path', 128), 'menu_name'),
      'menu_plid_expand_child' => array(
        'menu_name', 'plid', 'expanded', 'has_children'),
      'menu_parents' => array(
        'menu_name', 'p1', 'p2', 'p3', 'p4', 'p5', 'p6', 'p7', 'p8', 'p9'),
      'router_path' => array(array('router_path', 128)),
      ),
    'primary key' => array('mlid'),
    );

  $schema['sessions'] = array(
    'description' => t("Drupal's session handlers read and write into the sessions table. Each record represents a user session, either anonymous or authenticated."),
    'fields' => array(
      'uid' => array(
        'description' => t('The {users}.uid corresponding to a session, or 0 for anonymous user.'),
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE),
      'sid' => array(
        'description' => t("Primary key: A session ID. The value is generated by PHP's Session API."),
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => ''),
      'hostname' => array(
        'description' => t('The IP address that last used this session ID (sid).'),
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => ''),
      'timestamp' => array(
        'description' => t('The Unix timestamp when this session last requested a page. Old records are purged by PHP automatically.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'cache' => array(
        'description' => t("The time of this user's last post. This is used when the site has specified a minimum_cache_lifetime. See cache_get()."),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'session' => array(
        'description' => t('The serialized contents of $_SESSION, an array of name/value pairs that persists across page requests by this session ID. Drupal loads $_SESSION from here at the start of each request and saves it at the end.'),
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big')
      ),
    'primary key' => array('sid'),
    'indexes' => array(
      'timestamp' => array('timestamp'),
      'uid' => array('uid')
      ),
    );

  $schema['system'] = array(
    'description' => t("A list of all modules, themes, and theme engines that are or have been installed in Drupal's file system."),
    'fields' => array(
      'filename' => array(
        'description' => t('The path of the primary file for this item, relative to the Drupal root; e.g. modules/node/node.module.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'name' => array(
        'description' => t('The name of the item; e.g. node.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'type' => array(
        'description' => t('The type of the item, either module, theme, or theme_engine.'),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'owner' => array(
        'description' => t("A theme's 'parent'. Can be either a theme or an engine."),
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => ''),
      'status' => array(
        'description' => t('Boolean indicating whether or not this item is enabled.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),
      'throttle' => array(
        'description' => t('Boolean indicating whether this item is disabled when the throttle.module disables throttleable items.'),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny'),
      'bootstrap' => array(
        'description' => t("Boolean indicating whether this module is loaded during Drupal's early bootstrapping phase (e.g. even before the page cache is consulted)."),
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0),