code: function manageProcess(proc, cb) {
    var errorMsg = '';
    proc.stderr.on('data', function(data) {
      errorMsg += data.toString();
    });
    proc.on('close', function(code) {
      cb(code === 0 ? null : { message: errorMsg });
    });
  }
docs: manageProcess
  
  @param {ChildProcess} proc
  @param {Function} cb
  @api private