# Copyright 2017  Lars Wirzenius
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=



import os
import stat

import cliapp

import vmdb


class KpartxPlugin(cliapp.Plugin):

    def enable(self):
        self.app.step_runners.add(KpartxStepRunner())


class KpartxStepRunner(vmdb.StepRunnerInterface):

    def get_key_spec(self):
        return {
            'kpartx': str,
        }

    def run(self, values, settings, state):
        device = values['kpartx']
        tags = state.tags.get_tags()
        devs = self.kpartx(device)
        for tag, dev in zip(tags, devs):
            vmdb.progress('remembering {} as {}'.format(dev, tag))
            state.tags.set_dev(tag, dev)

    def kpartx(self, device):
        output = vmdb.runcmd(['kpartx', '-asv', device]).decode('UTF-8')
        for line in output.splitlines():
            words = line.split()
            if words[0] == 'add':
                name = words[2]
                yield '/dev/mapper/{}'.format(name)

    def teardown(self, values, settings, state):
        device = values['kpartx']
        vmdb.runcmd(['kpartx', '-dsv', device])
