docs: def apply(self, folder):
          """ Merge code from the given repo url to the git repo contained in the given folder.
  
          :param string folder: path of the folder where is the git repo cloned at.
          :raise: RuntimeError if the patch could not be applied.
          """
          logger.info("Apply Patch %s@%s (commit %s)", self.url, self.branch, self.commit)
          remote_name = 'patch'
          commands = [
              "git remote add {} {}".format(remote_name, self.url),
              "git fetch {} {}".format(remote_name, self.branch),
              'git merge {} -m "patch"'.format(self.commit),
              "git remote remove {}".format(remote_name),
          ]
          for command in commands:
              return_code, stream_data = _run_command_inside_folder(command, folder)
              if return_code:
                  msg = "Could not apply patch from {}@{}: {}. Error: {}".format(
                      self.url, self.branch, command, stream_data)
                  logger.error(msg)
                  raise RuntimeError(msg)