#!/usr/bin/env python3
# group: rw quick migration
#
# Regression test for issue 945:
# https://gitlab.com/qemu-project/qemu/-/issues/945
# Test adding an export on top of an iothread-ed block device while in
# -incoming defer.
#
# Copyright (C) 2022 Red Hat, Inc.
#
# 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 2 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/>.
#

import os
import iotests
from iotests import qemu_img_create


image_size = 1 * 1024 * 1024
test_img = os.path.join(iotests.test_dir, 'test.img')
node_name = 'node0'
iothread_id = 'iothr0'

nbd_sock = os.path.join(iotests.sock_dir, 'nbd.sock')


class TestExportIncomingIothread(iotests.QMPTestCase):
    def setUp(self) -> None:
        qemu_img_create('-f', iotests.imgfmt, test_img, str(image_size))

        self.vm = iotests.VM()
        self.vm.add_object(f'iothread,id={iothread_id}')
        self.vm.add_blockdev((
            f'driver={iotests.imgfmt}',
            f'node-name={node_name}',
            'file.driver=file',
            f'file.filename={test_img}'
        ))
        self.vm.add_incoming('defer')
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(test_img)

    def test_export_add(self):
        result = self.vm.qmp('nbd-server-start', {
            'addr': {
                'type': 'unix',
                'data': {
                    'path': nbd_sock
                }
            }
        })
        self.assert_qmp(result, 'return', {})

        # Regression test for issue 945: This should not fail an assertion
        result = self.vm.qmp('block-export-add', {
            'type': 'nbd',
            'id': 'exp0',
            'node-name': node_name,
            'iothread': iothread_id
        })
        self.assert_qmp(result, 'return', {})


if __name__ == '__main__':
    iotests.main(supported_fmts=['generic'],
                 unsupported_fmts=['luks'], # Would need a secret
                 supported_protocols=['file'])