source: sipes/modules_contrib/ctools/ctools.install @ 6e81fb4

<?php

/**
 * @file
 * Contains install and update functions for ctools.
 */

/**
 * Use requirements to ensure that the CTools CSS cache directory can be
 * created and that the PHP version requirement is met.
 */
function ctools_requirements($phase) {
  $requirements = array();
  if ($phase == 'runtime') {
    $path = file_create_path('ctools/css');
    if (!file_check_directory($path)) {
      $path = file_directory_path() . '/ctools';
      file_check_directory($path, FILE_CREATE_DIRECTORY);
      $path .= '/css';
      file_check_directory($path, FILE_CREATE_DIRECTORY);
    }

    $requirements['ctools_css_cache'] = array(
      'title' => t('CTools CSS Cache'),
      'severity' => REQUIREMENT_OK,
      'value' => t('Exists'),
    );

    if (!file_check_directory($path)) {
      $requirements['ctools_css_cache']['description'] = t('The CTools CSS cache directory, %path could not be created due to a misconfigured files directory. Please ensure that the files directory is correctly configured and that the webserver has permission to create directories.', array('%path' => $path));
      $requirements['ctools_css_cache']['severity'] = REQUIREMENT_ERROR;
      $requirements['ctools_css_cache']['value'] = t('Unable to create');
    }

    if (!function_exists('error_get_last')) {
          $requirements['ctools_php_52']['title'] = t('CTools PHP requirements');
      $requirements['ctools_php_52']['description'] = t('CTools requires certain features only available in PHP 5.2.0 or higher.');
      $requirements['ctools_php_52']['severity'] = REQUIREMENT_WARNING;
      $requirements['ctools_php_52']['value'] = t('PHP !version', array('!version' => phpversion()));
    }
  }

  return $requirements;
}

/**
 * Implementation of hook_install()
 */
function ctools_install() {
  drupal_install_schema('ctools');
}

/**
 * Implementation of hook_uninstall()
 */
function ctools_uninstall() {
  drupal_uninstall_schema('ctools');
}

/**
 * Implementation of hook_schemea
 */
function ctools_schema() {
  return ctools_schema_2();
}

/**
 * Version 2 of the CTools schema.
 */
function ctools_schema_2() {
  $schema = ctools_schema_1();

  // update the 'name' field to be 128 bytes long:
  $schema['ctools_object_cache']['fields']['name']['length'] = 128;

  // DO NOT MODIFY THIS TABLE -- this definition is used to create the table.
  // Changes to this table must be made in schema_3 or higher.
  $schema['ctools_css_cache'] = array(
    'description' => 'A special cache used to store CSS that must be non-volatile.',
    'fields' => array(
      'cid' => array(
        'type' => 'varchar',
        'length' => '128',
        'description' => 'The CSS ID this cache object belongs to.',
        'not null' => TRUE,
      ),
      'filename' => array(
        'type' => 'varchar',
        'length' => '255',
        'description' => 'The filename this CSS is stored in.',
      ),
      'css' => array(
        'type' => 'text',
        'size' => 'big',
        'description' => 'CSS being stored.',
        'serialize' => TRUE,
      ),
      'filter' => array(
         'type' => 'int',
         'size' => 'tiny',
         'description' => 'Whether or not this CSS needs to be filtered.',
       ),
    ),
    'primary key' => array('cid'),
  );

  return $schema;
}

/**
 * CTools' initial schema; separated for the purposes of updates.
 *
 * DO NOT MAKE CHANGES HERE. This schema version is locked.
 */
function ctools_schema_1() {
  $schema['ctools_object_cache'] = array(
    'description' => t('A special cache used to store objects that are being edited; it serves to save state in an ordinarily stateless environment.'),
    'fields' => array(
      'sid' => array(
        'type' => 'varchar',
        'length' => '64',
        'not null' => TRUE,
        'description' => 'The session ID this cache object belongs to.',
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => '32',
        'not null' => TRUE,
        'description' => 'The name of the object this cache is attached to.',
      ),
      'obj' => array(
        'type' => 'varchar',
        'length' => '32',
        'not null' => TRUE,
        'description' => 'The type of the object this cache is attached to; this essentially represents the owner so that several sub-systems can use this cache.',
      ),
      'updated' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The time this cache was created or updated.',
      ),
      'data' => array(
        'type' => 'text',
        'size' => 'big',
        'description' => 'Serialized data being stored.',
        'serialize' => TRUE,
      ),
    ),
    'primary key' => array('sid', 'obj', 'name'),
    'indexes' => array('updated' => array('updated')),
  );
  return $schema;
}

/**
 * Enlarge the ctools_object_cache.name column to prevent truncation and weird
 * errors.
 */
function ctools_update_6001() {
  $ret = array();

  // Perform updates like this to reduce code duplication.
  $schema = ctools_schema_2();

  db_change_field($ret, 'ctools_object_cache', 'name', 'name', $schema['ctools_object_cache']['fields']['name']);

  return $ret;
}

/**
 * Add the new css cache table.
 */
function ctools_update_6002() {
  $ret = array();

  // Schema 2 is locked and should not be changed.
  $schema = ctools_schema_2();

  db_create_table($ret, 'ctools_css_cache', $schema['ctools_css_cache']);
  return $ret;
}

/**
 * Take over for the panels_views module if it was on.
 */
function ctools_update_6003() {
  $ret = array();

  $result = db_result(db_query("SELECT status FROM {system} WHERE name = 'panels_views'"));
  if ($result) {
    $ret[] = update_sql("DELETE from {system} WHERE name = 'panels_views'");
    drupal_install_modules(array('views_content'));
  }

  return $ret;
}

/**
 * Add primary key to the ctools_object_cache table.
 */
function ctools_update_6004() {
  $ret = array();
  db_add_primary_key($ret, 'ctools_object_cache', array('sid', 'obj', 'name'));
  db_drop_index($ret, 'ctools_object_cache', 'sid_obj_name');
  return $ret;
}

/**
 * Removed update.
 */
function ctools_update_6005() {
  return array();
}

/**
 * ctools_custom_content table was originally here, but is now moved to
 * its own module.
 */
function ctools_update_6007() {
  $ret = array();
  if (db_table_exists('ctools_custom_content')) {
    // Enable the module to make everything as seamless as possible.
    drupal_install_modules(array('ctools_custom_content'));
  }

  return $ret;
}