check for valid repository for proper 404 handling

        @param environ:

        @param match_dict:

        """

        repo_name = match_dict.get('repo_name')

        return not cr(repo_name, config['base_path'])

    #REST routes

    with map.submapper(path_prefix='/_admin', controller='repos') as m:

        m.connect("repos", "/repos",

             action="create", conditions=dict(method=["POST"]))

        m.connect("repos", "/repos",

             action="index", conditions=dict(method=["GET"]))

        m.connect("formatted_repos", "/repos.{format}",

             action="index",

            conditions=dict(method=["GET"]))

        m.connect("new_repo", "/repos/new",

             action="new", conditions=dict(method=["GET"]))

        m.connect("formatted_new_repo", "/repos/new.{format}",

             action="new", conditions=dict(method=["GET"]))

        m.connect("/repos/{repo_name:.*}",

             action="update", conditions=dict(method=["PUT"],

                                              function=check_repo))

        m.connect("/repos/{repo_name:.*}",

             action="delete", conditions=dict(method=["DELETE"],

                                              function=check_repo))

        m.connect("edit_repo", "/repos/{repo_name:.*}/edit",

             action="edit", conditions=dict(method=["GET"],

                                            function=check_repo))

        m.connect("formatted_edit_repo", "/repos/{repo_name:.*}.{format}/edit",

             action="edit", conditions=dict(method=["GET"],

                                            function=check_repo))

        m.connect("repo", "/repos/{repo_name:.*}",

             action="show", conditions=dict(method=["GET"],

                                            function=check_repo))

        m.connect("formatted_repo", "/repos/{repo_name:.*}.{format}",

             action="show", conditions=dict(method=["GET"],

                                            function=check_repo))

        #ajax delete repo perm user

        m.connect('delete_repo_user', "/repos_delete_user/{repo_name:.*}",

             action="delete_perm_user", conditions=dict(method=["DELETE"],

                                                        function=check_repo))

    map.resource('user', 'users', path_prefix='/_admin')

    map.resource('permission', 'permissions', path_prefix='/_admin')

    #ADMIN

    with map.submapper(path_prefix='/_admin', controller='admin') as m:

        m.connect('admin_add_repo', '/add_repo/{new_repo:[a-z0-9\. _-]*}',

                  action='add_repo')

    #FEEDS

    map.connect('rss_feed_home', '/{repo_name:.*}/feed/rss',

                controller='feed', action='rss',

                conditions=dict(function=check_repo))

    map.connect('atom_feed_home', '/{repo_name:.*}/feed/atom',

                controller='feed', action='atom',

                conditions=dict(function=check_repo))

    map.connect('login_home', '/login', controller='login')

    map.connect('logout_home', '/logout', controller='login', action='logout')

    map.connect('changeset_home', '/{repo_name:.*}/changeset/{revision}',

                controller='changeset', revision='tip',

                conditions=dict(function=check_repo))

    map.connect('summary_home', '/{repo_name:.*}/summary',

                controller='summary', conditions=dict(function=check_repo))

    map.connect('shortlog_home', '/{repo_name:.*}/shortlog',

                controller='shortlog', conditions=dict(function=check_repo))

    map.connect('branches_home', '/{repo_name:.*}/branches',

                controller='branches', conditions=dict(function=check_repo))

    map.connect('tags_home', '/{repo_name:.*}/tags',

                controller='tags', conditions=dict(function=check_repo))

    map.connect('changelog_home', '/{repo_name:.*}/changelog',

                controller='changelog', conditions=dict(function=check_repo))    

    map.connect('files_home', '/{repo_name:.*}/files/{revision}/{f_path:.*}',

                controller='files', revision='tip', f_path='',

                conditions=dict(function=check_repo))

    map.connect('files_diff_home', '/{repo_name:.*}/diff/{f_path:.*}',

                controller='files', action='diff', revision='tip', f_path='',

                conditions=dict(function=check_repo))

    map.connect('files_raw_home', '/{repo_name:.*}/rawfile/{revision}/{f_path:.*}',

                controller='files', action='rawfile', revision='tip', f_path='',

                conditions=dict(function=check_repo))

    map.connect('files_annotate_home', '/{repo_name:.*}/annotate/{revision}/{f_path:.*}',

                controller='files', action='annotate', revision='tip', f_path='',

                conditions=dict(function=check_repo))    

    map.connect('files_archive_home', '/{repo_name:.*}/archive/{revision}/{fileformat}',

                controller='files', action='archivefile', revision='tip',

                conditions=dict(function=check_repo))

    return map