晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
# Author: Ben Howard <ben.howard@canonical.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import copy

from cloudinit.distros import PREFERRED_NTP_CLIENTS, debian
from cloudinit.distros.package_management.snap import Snap


class Distro(debian.Distro):
    def __init__(self, name, cfg, paths):
        super().__init__(name, cfg, paths)
        # Ubuntu specific network cfg locations
        self.network_conf_fn = {
            "eni": "/etc/network/interfaces.d/50-cloud-init.cfg",
            "netplan": "/etc/netplan/50-cloud-init.yaml",
        }
        self.renderer_configs = {
            "eni": {
                "eni_path": self.network_conf_fn["eni"],
                "eni_header": debian.NETWORK_FILE_HEADER,
            },
            "netplan": {
                "netplan_path": self.network_conf_fn["netplan"],
                "netplan_header": debian.NETWORK_FILE_HEADER,
                "postcmds": True,
            },
        }
        self.snap = Snap(self._runner)
        self.package_managers.append(self.snap)

    def package_command(self, command, args=None, pkgs=None):
        super().package_command(command, args, pkgs)
        self.snap.upgrade_packages()

    @property
    def preferred_ntp_clients(self):
        """The preferred ntp client is dependent on the version."""
        if not self._preferred_ntp_clients:
            self._preferred_ntp_clients = copy.deepcopy(PREFERRED_NTP_CLIENTS)
        return self._preferred_ntp_clients

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