<?php
  
  // fix webdav properties,add namespace in front of the property, update for OC4.5
  $installedVersion=OCP\Config::getAppValue('files', 'installed_version');
  if (version_compare($installedVersion, '1.1.6', '<')) {

  	$concat = OC_DB::getConnection()->getDatabasePlatform()->
  		getConcatExpression( '\'{DAV:}\'', '`propertyname`' );
  	$query = OC_DB::prepare('
  		UPDATE `*PREFIX*properties`
  		SET    `propertyname` = ' . $concat . '
  		WHERE  `propertyname` NOT LIKE \'{%\'
  	');
  	$query->execute();

  }
  
  //update from OC 3
  
  //try to remove remaining files.
  //Give a warning if not possible
  
  $filesToRemove = array(
  	'ajax',
  	'appinfo',
  	'css',
  	'js',
  	'l10n',
  	'templates',
  	'admin.php',
  	'download.php',
  	'index.php',
  	'settings.php'
  );
  
  foreach($filesToRemove as $file) {
  	$filepath = OC::$SERVERROOT . '/files/' . $file;
  	if(!file_exists($filepath)) {
  		continue;
  	}
  	$success = OCP\Files::rmdirr($filepath);
  	if($success === false) {
  		//probably not sufficient privileges, give up and give a message.
  		OCP\Util::writeLog('files', 'Could not clean /files/ directory.'
  				.' Please remove everything except webdav.php from ' . OC::$SERVERROOT . '/files/', OCP\Util::ERROR);
  		break;
  	}
  }