Quick and dirty wordpress deployment plugin

deployment.php

<?php

/*
Plugin Name: Deployment routines
Description: Runs update routines allowing code based database updates.
Author: Andy Mantell
Version: 1.0
*/
add_action('admin_init', 'deployment_admin_init');

/**
 * Attached to init. Runs any necessary update routines
 */
function deployment_admin_init() {

  // What is the current version of this plugin?
  $deployment_version = 1;

  // What is the current version in the db
  $db_version = get_option('deployment_version', 0);

  // Is the db out of date?
  if($db_version < $deployment_version) {

    // If so, loop over all subsequent version numbers and attempt to run corresponding deployment_update_N functions
    for($version = $db_version + 1; $version <= $deployment_version; $version++) {
      if(function_exists('deployment_update_' . $version)) {
        $success = call_user_func('deployment_update_' . $version);

        // If the function returns a boolean false, log an error and bail out. Subsequent updates may rely on this update
        // so we shouldn't proceed any further.
        if($success === FALSE) {
          // @TODO: log error here
          break;
        }
      }

      // If we've reached this far without error, update the db version
      update_option('deployment_version', $version);
    }

    // @TODO: output update summary on success
  }
}

/**
 * Update functions.
 */

/**
 * Disable the wordpress-meta-description plugin.
 * Enable and configure the add-meta-tags plugin
 */
function deployment_update_1() {

  // Include the plugin.php file so you have access to the activate_plugin() function
  require_once(ABSPATH .'/wp-admin/includes/plugin.php');

  deactivate_plugins(WP_PLUGIN_DIR . '/wordpress-meta-description/wp-meta-description.php');
  activate_plugins(WP_PLUGIN_DIR . '/add-meta-tags/add-meta-tags.php');

  update_option('add_meta_tags_opts', array(
    'settings_version' => 2,
    'site_description' => 'Site description here',
    'site_keywords' => 'site, keywords, here',
    'global_keywords' => 'global, keywords, here',
    'site_wide_meta' => '',
    'auto_description' => '1',
    'auto_keywords' => '1',
    'auto_opengraph' => '0',
    'auto_dublincore' => '0',
    'noodp_description' => '0',
    'noindex_search_results' => '1',
    'noindex_date_archives' => '0',
    'noindex_category_archives' => '0',
    'noindex_tag_archives' => '0',
    'noindex_author_archives' => '0',
    'copyright_url' => '',
    'default_image_url' => '',
    'i_have_donated' => '0',
  ));

  return TRUE;
}