<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 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)