function(user, path, cwd, cb) {
    logger.info('link system: ' + path + ', ' + cwd);
    _sr.linkSystem(user, path, cwd, cb);
  }
function(user, path, cwd, cb) {
    logger.info('link system: ' + path + ', ' + cwd);
    _sr.linkSystem(user, path, cwd, cb);
  }
function ( user , path , cwd , cb ) { logger . info ( 'link system: ' + path + ', ' + cwd ) ; _sr . linkSystem ( user , path , cwd , cb ) ; }
link a system from local fs
link a system from local fs