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/cloud.py
# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# This file is part of cloud-init. See LICENSE file for license information.

import copy
import logging
import os
from typing import Optional

from cloudinit.distros import Distro
from cloudinit.helpers import Paths, Runners
from cloudinit.reporting import events
from cloudinit.sources import DataSource

LOG = logging.getLogger(__name__)

# This class is the high level wrapper that provides
# access to cloud-init objects without exposing the stage objects
# to handler and or module manipulation. It allows for cloud
# init to restrict what those types of user facing code may see
# and or adjust (which helps avoid code messing with each other)
#
# It also provides util functions that avoid having to know
# how to get a certain member from this submembers as well
# as providing a backwards compatible object that can be maintained
# while the stages/other objects can be worked on independently...


class Cloud:
    def __init__(
        self,
        datasource: DataSource,
        paths: Paths,
        cfg: dict,
        distro: Distro,
        runners: Runners,
        reporter: Optional[events.ReportEventStack] = None,
    ):
        self.datasource = datasource
        self.paths = paths
        self.distro = distro
        self._cfg = cfg
        self._runners = runners
        if reporter is None:
            reporter = events.ReportEventStack(
                name="unnamed-cloud-reporter",
                description="unnamed-cloud-reporter",
                reporting_enabled=False,
            )
        self.reporter = reporter

    @property
    def cfg(self):
        # Ensure that cfg is not indirectly modified
        return copy.deepcopy(self._cfg)

    def run(self, name, functor, args, freq=None, clear_on_fail=False):
        return self._runners.run(name, functor, args, freq, clear_on_fail)

    def get_template_filename(self, name):
        fn = self.paths.template_tpl % (name)
        if not os.path.isfile(fn):
            LOG.warning(
                "No template found in %s for template named %s",
                os.path.dirname(fn),
                name,
            )
            return None
        return fn

    # The rest of these are just useful proxies
    def get_userdata(self, apply_filter=True):
        return self.datasource.get_userdata(apply_filter)

    def get_instance_id(self):
        return self.datasource.get_instance_id()

    @property
    def launch_index(self):
        return self.datasource.launch_index

    def get_public_ssh_keys(self):
        return self.datasource.get_public_ssh_keys()

    def get_locale(self):
        return self.datasource.get_locale()

    def get_hostname(self, fqdn=False, metadata_only=False):
        return self.datasource.get_hostname(
            fqdn=fqdn, metadata_only=metadata_only
        )

    def device_name_to_device(self, name):
        return self.datasource.device_name_to_device(name)

    def get_ipath_cur(self, name=None):
        return self.paths.get_ipath_cur(name)

    def get_cpath(self, name=None):
        return self.paths.get_cpath(name)

    def get_ipath(self, name=None):
        return self.paths.get_ipath(name)

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