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) 2023 Canonical Ltd., Chi Wai Chan <chiwai.chan@canonical.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 subprocess

from sos.collector.exceptions import JujuNotInstalledException
from sos.collector.transports import RemoteTransport
from sos.utilities import sos_get_command_output


class JujuSSH(RemoteTransport):
    """
    A "transport" that leverages `juju ssh` to perform commands on the remote
    hosts.

    This transport is expected to be used in juju managed environment, and the
    user should have the necessary credential for accessing the controller.
    When using this transport, the --nodes option will be expected to be a
    comma separated machine IDs, **not** IP addr, since `juju ssh` identifies
    the ssh target by machine ID.

    Examples:

    sos collect --nodes 0,1,2 --no-local --transport juju --batch

    """

    name = "juju_ssh"
    default_user = "ubuntu"

    def _check_juju_installed(self):
        cmd = "juju version"
        try:
            subprocess.check_output(cmd, stderr=subprocess.STDOUT, shell=True)
        except subprocess.CalledProcessError as err:
            self.log_error("Failed to check `juju` version")
            raise JujuNotInstalledException from err
        return True

    def _chmod(self, fname):
        cmd = f"{self.remote_exec} sudo chmod o+r {fname}"
        try:
            subprocess.check_output(cmd, stderr=subprocess.STDOUT, shell=True)
        except subprocess.CalledProcessError:
            self.log_error(f"Failed to make {fname} world-readable")
            raise
        return True

    def _connect(self, password=""):
        self._connected = self._check_juju_installed()
        return self._connected

    def _disconnect(self):
        return True

    @property
    def connected(self):
        return self._connected

    @property
    def remote_exec(self):
        model, target_option = self.address.split(":")
        model_option = f"-m {model}" if model else ""
        option = f"{model_option} {target_option}"
        return f"juju ssh {option}"

    def _copy_file_to_remote(self, fname, dest):
        model, unit = self.address.split(":")
        model_option = f"-m {model}" if model else ""
        cmd = f"juju scp {model_option} -- {fname} {unit}:{dest}"
        res = sos_get_command_output(cmd, timeout=15)
        return res["status"] == 0

    def _retrieve_file(self, fname, dest):
        self._chmod(fname)  # juju scp needs the archive to be world-readable
        model, unit = self.address.split(":")
        model_option = f"-m {model}" if model else ""
        cmd = f"juju scp {model_option} -- -r {unit}:{fname} {dest}"
        res = sos_get_command_output(cmd)
        return res["status"] == 0


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