category='warning')

            redirect(url('summary_home', repo_name=repo.repo_name))

        except RepositoryError, e:

            log.error(traceback.format_exc())

            h.flash(str(e), category='warning')

            if not partial:

                redirect(h.url('summary_home', repo_name=repo.repo_name))

            raise HTTPBadRequest()

    def _get_changesets(self, alias, org_repo, org_ref, other_repo, other_ref, merge):

        """

        Returns a list of changesets that can be merged from org_repo@org_ref

        to other_repo@other_ref ... and the ancestor that would be used for merge

        :param org_repo:

        :param org_ref:

        :param other_repo:

        :param other_ref:

        :param tmp:

        """

        ancestor = None

            # lookup up the exact node id

            _revset_predicates = {

                    'branch': 'branch',

                    'book': 'bookmark',

                    'tag': 'tag',

                    'rev': 'id',

                }

            org_rev_spec = "max(%s(%%s))" % _revset_predicates[org_ref[0]]

            org_revs = org_repo._repo.revs(org_rev_spec, safe_str(org_ref[1]))

            org_rev = org_repo._repo[org_revs[-1] if org_revs else -1].hex()

            other_revs_spec = "max(%s(%%s))" % _revset_predicates[other_ref[0]]

            other_revs = other_repo._repo.revs(other_revs_spec, safe_str(other_ref[1]))

            other_rev = other_repo._repo[other_revs[-1] if other_revs else -1].hex()

            #case two independent repos

            if org_repo != other_repo:

                hgrepo = unionrepo.unionrepository(other_repo.baseui,

                                                   other_repo.path,

                                                   org_repo.path)

                # all the changesets we are looking for will be in other_repo,

                # so rev numbers from hgrepo can be used in other_repo