Traverse filesystem upwards, searching for .svn directories
        with matching UUIDs (Recursive)

        Args:
            fpath (str): file path to search upwards from
            repodirname (str): directory name to search for (``.svn``)
            upwards (dict): dict of already-searched directories

        example::

            repo/.svn
            repo/dir1/.svn
            repo/dir1/dir2/.svn

            >> search_upwards('repo/')
            << 'repo/'
            >> search_upwards('repo/dir1')
            << 'repo/'
            >> search_upwards('repo/dir1/dir2')
            << 'repo/'

            repo/.svn
            repo/dirA/
            repo/dirA/dirB/.svn

            >> search_upwards('repo/dirA')
            << 'repo/'
            >> search_upwards('repo/dirA/dirB')
            >> 'repo/dirB')

def search_upwards(self, fpath=None, repodirname='.svn', upwards={}):
        """
        Traverse filesystem upwards, searching for .svn directories
        with matching UUIDs (Recursive)

        Args:
            fpath (str): file path to search upwards from
            repodirname (str): directory name to search for (``.svn``)
            upwards (dict): dict of already-searched directories

        example::

            repo/.svn
            repo/dir1/.svn
            repo/dir1/dir2/.svn

            >> search_upwards('repo/')
            << 'repo/'
            >> search_upwards('repo/dir1')
            << 'repo/'
            >> search_upwards('repo/dir1/dir2')
            << 'repo/'

            repo/.svn
            repo/dirA/
            repo/dirA/dirB/.svn

            >> search_upwards('repo/dirA')
            << 'repo/'
            >> search_upwards('repo/dirA/dirB')
            >> 'repo/dirB')

        """
        fpath = fpath or self.fpath
        uuid = self.unique_id
        last_path = self

        path_comp = fpath.split(os.path.sep)
        # [0:-1], [0:-2], [0:-1*len(path_comp)]
        for n in xrange(1, len(path_comp)-1):
            checkpath = os.path.join(*path_comp[0:-1 * n])
            repodir = os.path.join(checkpath, repodirname)
            upw_uuid = upwards.get(repodir)
            if upw_uuid:
                if upw_uuid == uuid:
                    last_path = SvnRepository(checkpath)
                    continue
                else:
                    break
            elif os.path.exists(repodir):
                repo = SvnRepository(checkpath)
                upw_uuid = repo.unique_id
                upwards[repodir] = upw_uuid
                # TODO: match on REVISION too
                if upw_uuid == uuid:
                    last_path = repo
                    continue
                else:
                    break

        return last_path