code: function like_a_boss(attempt) {
      fs.rename(from, to, function(err) {
        if (err) log('Error when moving directory: ' + err.message);
  
        // if no error, or err is not EPERM/EACCES, we're done
        if (!err || (err.code != 'EPERM' && err.code != 'EACCES'))
          cb();
        else if (attempt >= 30) // max attempts reached, so give up.
          cb(err);
        else
          setTimeout(function() { like_a_boss(attempt + 1) }, 1000);
  
      })
    }
docs: on windows, antivirus softwares lock new folders until all files are scanned which causes a EPERM error when doing a fs.rename. to prevent this from ruining the process, we'll retry the fs.rename 10 times every one second if we do get a EPERM error.