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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, 2013 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

from cloudinit import util
from cloudinit.distros.parsers.sys_conf import SysConf

LOG = logging.getLogger(__name__)


# Helper function to update a RHEL/SUSE /etc/sysconfig/* file
def update_sysconfig_file(fn, adjustments, allow_empty=False):
    if not adjustments:
        return
    (exists, contents) = read_sysconfig_file(fn)
    updated_am = 0
    for (k, v) in adjustments.items():
        if v is None:
            continue
        v = str(v)
        if len(v) == 0 and not allow_empty:
            continue
        contents[k] = v
        updated_am += 1
    if updated_am:
        lines = [
            str(contents),
        ]
        if not exists:
            lines.insert(0, util.make_header())
        util.write_file(fn, "\n".join(lines) + "\n", 0o644)


# Helper function to read a RHEL/SUSE /etc/sysconfig/* file
def read_sysconfig_file(fn):
    exists = False
    try:
        contents = util.load_file(fn).splitlines()
        exists = True
    except IOError:
        contents = []
    return (exists, SysConf(contents))

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