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

import logging

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

LOG = logging.getLogger(__name__)


class Renderer(cloudinit.net.bsd.BSDRenderer):
    def __init__(self, config=None):
        self._route_cpt = 0
        super(Renderer, self).__init__()

    def rename_interface(self, cur_name, device_name):
        self.set_rc_config_value("ifconfig_%s_name" % cur_name, device_name)

    def write_config(self):
        for device_name, v in self.interface_configurations.items():
            if isinstance(v, dict):
                net_config = "inet %s netmask %s" % (
                    v.get("address"),
                    v.get("netmask"),
                )
                mtu = v.get("mtu")
                if mtu:
                    net_config += " mtu %d" % mtu
            elif v == "DHCP":
                net_config = "DHCP"
            self.set_rc_config_value("ifconfig_" + device_name, net_config)

        for device_name, v in self.interface_configurations_ipv6.items():
            if isinstance(v, dict):
                net_config = "inet6 %s/%d" % (
                    v.get("address"),
                    v.get("prefix"),
                )
                mtu = v.get("mtu")
                if mtu:
                    net_config += " mtu %d" % mtu
            self.set_rc_config_value(
                "ifconfig_%s_ipv6" % device_name, net_config
            )

    def start_services(self, run=False):
        if not run:
            LOG.debug("freebsd generate postcmd disabled")
            return

        for dhcp_interface in self.dhcp_interfaces():
            # Observed on DragonFlyBSD 6. If we use the "restart" parameter,
            # the routes are not recreated.
            net.dhcp.IscDhclient.stop_service(
                dhcp_interface, distros.freebsd.Distro
            )

        subp.subp(["service", "netif", "restart"], capture=True)
        # On FreeBSD 10, the restart of routing and dhclient is likely to fail
        # because
        # - routing: it cannot remove the loopback route, but it will still set
        #   up the default route as expected.
        # - dhclient: it cannot stop the dhclient started by the netif service.
        # In both case, the situation is ok, and we can proceed.
        subp.subp(["service", "routing", "restart"], capture=True, rcs=[0, 1])

        for dhcp_interface in self.dhcp_interfaces():
            net.dhcp.IscDhclient.start_service(
                dhcp_interface, distros.freebsd.Distro
            )

    def set_route(self, network, netmask, gateway):
        if network == "0.0.0.0":
            self.set_rc_config_value("defaultrouter", gateway)
        elif network == "::":
            self.set_rc_config_value("ipv6_defaultrouter", gateway)
        else:
            route_name = f"net{self._route_cpt}"
            route_cmd = f"-net {network} -netmask {netmask} {gateway}"
            self.set_rc_config_value("route_" + route_name, route_cmd)
            self.route_names = f"{self.route_names} {route_name}"
            self.set_rc_config_value("static_routes", self.route_names.strip())
            self._route_cpt += 1


def available(target=None):
    return util.is_FreeBSD() or util.is_DragonFlyBSD()

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