Lists the current on-chain configuration values.

def _do_identity_role_list(args):
    """Lists the current on-chain configuration values.
    """
    rest_client = RestClient(args.url)
    state = rest_client.list_state(subtree=IDENTITY_NAMESPACE + _ROLE_PREFIX)

    head = state['head']
    state_values = state['data']
    printable_roles = []
    for state_value in state_values:
        role_list = RoleList()
        decoded = b64decode(state_value['data'])
        role_list.ParseFromString(decoded)

        for role in role_list.roles:
            printable_roles.append(role)

    printable_roles.sort(key=lambda r: r.name)

    if args.format == 'default':
        tty_width = tty.width()
        for role in printable_roles:
            # Set value width to the available terminal space, or the min width
            width = tty_width - len(role.name) - 3
            width = width if width > _MIN_PRINT_WIDTH else _MIN_PRINT_WIDTH
            value = (role.policy_name[:width] + '...'
                     if len(role.policy_name) > width
                     else role.policy_name)
            print('{}: {}'.format(role.name, value))
    elif args.format == 'csv':
        try:
            writer = csv.writer(sys.stdout, quoting=csv.QUOTE_ALL)
            writer.writerow(['KEY', 'VALUE'])
            for role in printable_roles:
                writer.writerow([role.name, role.policy_name])
        except csv.Error:
            raise CliException('Error writing CSV')
    elif args.format == 'json' or args.format == 'yaml':
        roles_snapshot = {
            'head': head,
            'roles': {role.name: role.policy_name
                      for role in printable_roles}
        }
        if args.format == 'json':
            print(json.dumps(roles_snapshot, indent=2, sort_keys=True))
        else:
            print(yaml.dump(roles_snapshot, default_flow_style=False)[0:-1])
    else:
        raise AssertionError('Unknown format {}'.format(args.format))