file.install in Drupal 7

Install, update and uninstall functions for File module.

File

modules/file/file.install

<?php

/**
 * @file
 * Install, update and uninstall functions for File module.
 */

/**
 * Implements hook_field_schema().
 */
function file_field_schema($field) {
  return array(
    'columns' => array(
      'fid' => array(
        'description' => 'The {file_managed}.fid being referenced in this field.',
        'type' => 'int',
        'not null' => FALSE,
        'unsigned' => TRUE,
      ),
      'display' => array(
        'description' => 'Flag to control whether this file should be displayed when viewing content.',
        'type' => 'int',
        'size' => 'tiny',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 1,
      ),
      'description' => array(
        'description' => 'A description of the file.',
        'type' => 'text',
        'not null' => FALSE,
      ),
    ),
    'indexes' => array(
      'fid' => array(
        'fid',
      ),
    ),
    'foreign keys' => array(
      'fid' => array(
        'table' => 'file_managed',
        'columns' => array(
          'fid' => 'fid',
        ),
      ),
    ),
  );
}

/**
 * Implements hook_requirements().
 *
 * Display information about getting upload progress bars working.
 */
function file_requirements($phase) {
  $requirements = array();

  // Check the server's ability to indicate upload progress.
  if ($phase == 'runtime') {
    $implementation = file_progress_implementation();
    $apache = strpos($_SERVER['SERVER_SOFTWARE'], 'Apache') !== FALSE;
    $fastcgi = strpos($_SERVER['SERVER_SOFTWARE'], 'mod_fastcgi') !== FALSE || strpos($_SERVER["SERVER_SOFTWARE"], 'mod_fcgi') !== FALSE;
    $description = NULL;
    if (!$apache) {
      $value = t('Not enabled');
      $description = t('Your server is not capable of displaying file upload progress. File upload progress requires an Apache server running PHP with mod_php.');
      $severity = REQUIREMENT_INFO;
    }
    elseif ($fastcgi) {
      $value = t('Not enabled');
      $description = t('Your server is not capable of displaying file upload progress. File upload progress requires PHP be run with mod_php and not as FastCGI.');
      $severity = REQUIREMENT_INFO;
    }
    elseif (!$implementation && extension_loaded('apc')) {
      $value = t('Not enabled');
      $description = t('Your server is capable of displaying file upload progress through APC, but it is not enabled. Add <code>apc.rfc1867 = 1</code> to your php.ini configuration. Alternatively, it is recommended to use <a href="http://pecl.php.net/package/uploadprogress">PECL uploadprogress</a>, which supports more than one simultaneous upload.');
      $severity = REQUIREMENT_INFO;
    }
    elseif (!$implementation) {
      $value = t('Not enabled');
      $description = t('Your server is capable of displaying file upload progress, but does not have the required libraries. It is recommended to install the <a href="http://pecl.php.net/package/uploadprogress">PECL uploadprogress library</a> (preferred) or to install <a href="http://us2.php.net/apc">APC</a>.');
      $severity = REQUIREMENT_INFO;
    }
    elseif ($implementation == 'apc') {
      $value = t('Enabled (<a href="http://php.net/manual/en/apc.configuration.php#ini.apc.rfc1867">APC RFC1867</a>)');
      $description = t('Your server is capable of displaying file upload progress using APC RFC1867. Note that only one upload at a time is supported. It is recommended to use the <a href="http://pecl.php.net/package/uploadprogress">PECL uploadprogress library</a> if possible.');
      $severity = REQUIREMENT_OK;
    }
    elseif ($implementation == 'uploadprogress') {
      $value = t('Enabled (<a href="http://pecl.php.net/package/uploadprogress">PECL uploadprogress</a>)');
      $severity = REQUIREMENT_OK;
    }
    $requirements['file_progress'] = array(
      'title' => t('Upload progress'),
      'value' => $value,
      'severity' => $severity,
      'description' => $description,
    );
  }
  return $requirements;
}

Functions

Name	Description
file_field_schema	Implements hook_field_schema().
file_requirements	Implements hook_requirements().