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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Current File : //lib/python3.6/site-packages/cloudinit/net/openbsd.py
# This file is part of cloud-init. See LICENSE file for license information.

import logging
import platform

import cloudinit.net.bsd
from cloudinit import net, subp, util

LOG = logging.getLogger(__name__)


class Renderer(cloudinit.net.bsd.BSDRenderer):
    def write_config(self):
        for device_name, v in self.interface_configurations.items():
            if_file = "etc/hostname.{}".format(device_name)
            fn = subp.target_path(self.target, if_file)
            if device_name in self.dhcp_interfaces():
                content = "dhcp\n"
            elif isinstance(v, dict):
                try:
                    content = "inet {address} {netmask}".format(
                        address=v["address"], netmask=v["netmask"]
                    )
                except KeyError:
                    LOG.error(
                        "Invalid static configuration for %s", device_name
                    )
                mtu = v.get("mtu")
                if mtu:
                    content += " mtu %d" % mtu
                content += "\n" + self.interface_routes
            util.write_file(fn, content)

    def start_services(self, run=False):
        has_dhcpleasectl = bool(int(platform.release().split(".")[0]) > 6)
        if not self._postcmds:
            LOG.debug("openbsd generate postcmd disabled")
            return
        if has_dhcpleasectl:  # OpenBSD 7.0+
            subp.subp(["sh", "/etc/netstart"], capture=True)
            for interface in self.dhcp_interfaces():
                subp.subp(
                    ["dhcpleasectl", "-w", "30", interface], capture=True
                )
        else:
            net.dhcp.IscDhclient.kill_dhcp_client()
            subp.subp(["route", "del", "default"], capture=True, rcs=[0, 1])
            subp.subp(["route", "flush", "default"], capture=True, rcs=[0, 1])
            subp.subp(["sh", "/etc/netstart"], capture=True)

    def set_route(self, network, netmask, gateway):
        if network == "0.0.0.0":
            if_file = "etc/mygate"
            fn = subp.target_path(self.target, if_file)
            content = gateway + "\n"
            util.write_file(fn, content)
        else:
            self.interface_routes = (
                self.interface_routes
                + "!route add "
                + network
                + " -netmask "
                + netmask
                + " "
                + gateway
                + "\n"
            )


def available(target=None):
    return util.is_OpenBSD()

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