code: static function run_clean( $task=null, $args=array(), $cliopts=array() )
      {
          $opts = self::getOpts( @$args[0], @$args[1], $cliopts );
          if ( !SharedLock::acquire( $opts['extension']['name'], LOCK_EX, $opts ) )
              throw new PakeException( "Source code locked by another process" );
  
          pake_remove_dir( $opts['build']['dir'] );
  
          SharedLock::release( $opts['extension']['name'], LOCK_EX, $opts );
      }
docs: Removes the build/ directory