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　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。 . Prv8 Shell

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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>
#
# This file is part of cloud-init. See LICENSE file for license information.

import logging
import os

from cloudinit import handlers, subp, util
from cloudinit.settings import PER_ALWAYS

LOG = logging.getLogger(__name__)


class BootHookPartHandler(handlers.Handler):

    # The content prefixes this handler understands.
    prefixes = ["#cloud-boothook"]

    def __init__(self, paths, datasource, **_kwargs):
        handlers.Handler.__init__(self, PER_ALWAYS)
        self.boothook_dir = paths.get_ipath("boothooks")
        self.instance_id = None
        if datasource:
            self.instance_id = datasource.get_instance_id()

    def _write_part(self, payload, filename):
        filename = util.clean_filename(filename)
        filepath = os.path.join(self.boothook_dir, filename)
        contents = util.strip_prefix_suffix(
            util.dos2unix(payload), prefix=self.prefixes[0]
        )
        util.write_file(filepath, contents.lstrip(), 0o700)
        return filepath

    def handle_part(self, data, ctype, filename, payload, frequency):
        if ctype in handlers.CONTENT_SIGNALS:
            return

        filepath = self._write_part(payload, filename)
        try:
            env = os.environ.copy()
            if self.instance_id is not None:
                env["INSTANCE_ID"] = str(self.instance_id)
            LOG.debug("Executing boothook")
            subp.subp([filepath], env=env, capture=False)
        except subp.ProcessExecutionError:
            util.logexc(LOG, "Boothooks script %s execution error", filepath)
        except Exception:
            util.logexc(
                LOG, "Boothooks unknown error when running %s", filepath
            )

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