if group is None:

            group = Group(group_name, parent)

            sa.add(group)

            sa.commit()

        parent = group

    return group

def repo2db_mapper(initial_repo_list, remove_obsolete=False):

    """maps all repos given in initial_repo_list, non existing repositories

    are created, if remove_obsolete is True it also check for db entries

    that are not in initial_repo_list and removes them.

    :param initial_repo_list: list of repositories found by scanning methods

    :param remove_obsolete: check for obsolete entries in database

    """

    sa = meta.Session()

    rm = RepoModel()

    user = sa.query(User).filter(User.admin == True).first()

    added = []

    for name, repo in initial_repo_list.items():

        if not rm.get_by_repo_name(name, cache=False):

            log.info('repository %s not found creating default', name)

            added.append(name)

            form_data = {

                         'repo_name': name,

                         'repo_name_full': name,

                         'repo_type': repo.alias,

                         'description': repo.description \

                            if repo.description != 'unknown' else \

                                        '%s repository' % name,

                         'private': False,

                         'group_id': getattr(group, 'group_id', None)

                         }

            rm.create(form_data, user, just_db=True)

    removed = []

    if remove_obsolete:

        #remove from database those repositories that are not in the filesystem

        for repo in sa.query(Repository).all():

            if repo.repo_name not in initial_repo_list.keys():

                removed.append(repo.repo_name)

                sa.delete(repo)

                sa.commit()