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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# Copyright (C) 2020 Red Hat, Inc., Jake Hunsaker <jhunsake@redhat.com>

# This file is part of the sos project: https://github.com/sosreport/sos
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# version 2 of the GNU General Public License.
#
# See the LICENSE file in the source distribution for further information.

import json
import os

from sos.options import SoSOptions

PRESETS_PATH = "/etc/sos/presets.d"

#: Constants for on-disk preset fields
DESC = "desc"
NOTE = "note"
OPTS = "args"


class PresetDefaults():
    """Preset command line defaults to allow for quick reference to sets of
    commonly used options

    :param name: The name of the new preset
    :type name: ``str``

    :param desc: A description for the new preset
    :type desc: ``str``

    :param note: Note for the new preset
    :type note: ``str``

    :param opts: Options set for the new preset
    :type opts: ``SoSOptions``
    """
    #: Preset name, used for selection
    name = None
    #: Human readable preset description
    desc = None
    #: Notes on preset behaviour
    note = None
    #: Options set for this preset
    opts = SoSOptions()

    #: ``True`` if this preset if built-in or ``False`` otherwise.
    builtin = True

    def __str__(self):
        """Return a human readable string representation of this
            ``PresetDefaults`` object.
        """
        return (f"name={self.name} desc={self.desc} note={self.note} "
                f"opts=({str(self.opts)})")

    def __repr__(self):
        """Return a machine readable string representation of this
            ``PresetDefaults`` object.
        """
        return (f"PresetDefaults(name='{self.name}' desc='{self.desc}' "
                f"note='{self.note}' opts=({repr(self.opts)})")

    def __init__(self, name="", desc="", note=None, opts=SoSOptions()):
        """Initialise a new ``PresetDefaults`` object with the specified
            arguments.

            :returns: The newly initialised ``PresetDefaults``
        """
        self.name = name
        self.desc = desc
        self.note = note
        self.opts = opts

    def write(self, presets_path):
        """Write this preset to disk in JSON notation.

        :param presets_path: the directory where the preset will be written
        :type presets_path: ``str``
        """
        if self.builtin:
            raise TypeError("Cannot write built-in preset")

        # Make dictionaries of PresetDefaults values
        odict = self.opts.dict()
        pdict = {self.name: {DESC: self.desc, NOTE: self.note, OPTS: odict}}

        if not os.path.exists(presets_path):
            os.makedirs(presets_path, mode=0o755)

        with open(os.path.join(presets_path, self.name), "w",
                  encoding='utf-8') as pfile:
            json.dump(pdict, pfile)

    def delete(self, presets_path):
        """Delete a preset from disk

        :param presets_path: the directory where the preset is saved
        :type presets_path: ``str``
        """
        os.unlink(os.path.join(presets_path, self.name))


NO_PRESET = 'none'
NO_PRESET_DESC = 'Do not load a preset'
NO_PRESET_NOTE = 'Use to disable automatically loaded presets'

SMALL_PRESET = 'minimal'
SMALL_PRESET_DESC = ('Small and quick report that reduces sos report resource '
                     'consumption')
SMALL_PRESET_NOTE = ('May be useful for low-resource systems, but may not '
                     'provide sufficient data for analysis')

SMALL_PRESET_OPTS = SoSOptions(log_size=10, journal_size=10, plugin_timeout=30,
                               command_timeout=30, low_priority=True)

GENERIC_PRESETS = {
    NO_PRESET: PresetDefaults(
        name=NO_PRESET, desc=NO_PRESET_DESC, note=NO_PRESET_NOTE,
        opts=SoSOptions()
    ),
    SMALL_PRESET: PresetDefaults(
        name=SMALL_PRESET, desc=SMALL_PRESET_DESC, note=SMALL_PRESET_NOTE,
        opts=SMALL_PRESET_OPTS
    )
}

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