Determine the branch name of the working directory of this Repository

        Returns:
            str: branch name (``git symbolic-ref --short HEAD``)

def branch(self):
        """
        Determine the branch name of the working directory of this Repository

        Returns:
            str: branch name (``git symbolic-ref --short HEAD``)
        """
        # return self.sh(['git, 'branch'], shell=False)  # parse for '*'
        cmd = ['git', 'symbolic-ref', '--short', 'HEAD']
        try:
            output = self.sh(cmd, shell=False, ignore_error=True).rstrip()
        except subprocess.CalledProcessError as e:
            log.exception(e)
            return  "#err# %s" % output
            #if e.returncode == 128  # bare repo
        if output.startswith('fatal: ref HEAD is not a symbolic ref'):
            output = '# %s' % output
        return output