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 : //proc/thread-self/root/lib/python3.6/site-packages/cloudinit/sources/DataSourceBigstep.py
# Copyright (C) 2015-2016 Bigstep Cloud Ltd.
#
# Author: Alexandru Sirbu <alexandru.sirbu@bigstep.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

import errno
import json
import os

from cloudinit import sources, url_helper, util


class DataSourceBigstep(sources.DataSource):

    dsname = "Bigstep"

    def __init__(self, sys_cfg, distro, paths):
        super().__init__(sys_cfg, distro, paths)
        self.metadata = {}
        self.vendordata_raw = ""
        self.userdata_raw = ""

    def _get_data(self, apply_filter=False) -> bool:
        url = self._get_url_from_file()
        if url is None:
            return False
        response = url_helper.readurl(url)
        decoded = json.loads(response.contents.decode())
        self.metadata = decoded["metadata"]
        self.vendordata_raw = decoded["vendordata_raw"]
        self.userdata_raw = decoded["userdata_raw"]
        return True

    def _get_subplatform(self) -> str:
        """Return the subplatform metadata source details."""
        return f"metadata ({self._get_url_from_file()})"

    def _get_url_from_file(self):
        url_file = os.path.join(
            self.paths.cloud_dir, "data", "seed", "bigstep", "url"
        )
        try:
            content = util.load_file(url_file)
        except IOError as e:
            # If the file doesn't exist, then the server probably isn't a
            # Bigstep instance; otherwise, another problem exists which needs
            # investigation
            if e.errno == errno.ENOENT:
                return None
            else:
                raise
        return content


# Used to match classes to dependencies
datasources = [
    (DataSourceBigstep, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)),
]


# Return a list of data sources that match this set of dependencies
def get_datasource_list(depends):
    return sources.list_from_depends(depends, datasources)

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