elif alias == 'git':

            r = backend(repo_path, create=True, src_url=clone_uri, bare=True)

            # add rhodecode hook into this repo

            ScmModel().install_git_hook(repo=r)

        else:

            raise Exception('Undefined alias %s' % alias)

    def __rename_repo(self, old, new):

        """

        renames repository on filesystem

        :param old: old name

        :param new: new name

        """

        log.info('renaming repo from %s to %s' % (old, new))

        old_path = os.path.join(self.repos_path, old)

        new_path = os.path.join(self.repos_path, new)

        if os.path.isdir(new_path):

            raise Exception(

                'Was trying to rename to already existing dir %s' % new_path

            )

        shutil.move(old_path, new_path)

    def __delete_repo(self, repo):

        """

        removes repo from filesystem, the removal is acctually made by

        added rm__ prefix into dir, and rename internat .hg/.git dirs so this

        repository is no longer valid for rhodecode, can be undeleted later on

        by reverting the renames on this repository

        :param repo: repo object

        """

        rm_path = os.path.join(self.repos_path, repo.repo_name)

        log.info("Removing %s" % (rm_path))

        # disable hg/git internal that it doesn't get detected as repo

        alias = repo.repo_type

        bare = getattr(repo.scm_instance, 'bare', False)

        if not bare:

            # skip this for bare git repos

            shutil.move(os.path.join(rm_path, '.%s' % alias),

                        os.path.join(rm_path, 'rm__.%s' % alias))

        # disable repo

        _now = datetime.now()

        _ms = str(_now.microsecond).rjust(6, '0')

        _d = 'rm__%s__%s' % (_now.strftime('%Y%m%d_%H%M%S_' + _ms),

        shutil.move(rm_path, os.path.join(self.repos_path, _d))