iotests: test clearing unknown autoclear_features by qcow2

#!/usr/bin/env python

#

# Test clearing unknown autoclear_features flag by qcow2 after

# migration. This test mimics migration to older qemu.

#

# Copyright (c) 2017 Parallels International GmbH

#

# 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

disk = os.path.join(iotests.test_dir, 'disk')

migfile = os.path.join(iotests.test_dir, 'migfile')

class TestInvalidateAutoclear(iotests.QMPTestCase):

    def tearDown(self):

        self.vm_a.shutdown()

        self.vm_b.shutdown()

        os.remove(disk)

        os.remove(migfile)

    def setUp(self):

        qemu_img('create', '-f', iotests.imgfmt, disk, '1M')

        self.vm_a = iotests.VM(path_suffix='a').add_drive(disk)

        self.vm_a.launch()

        self.vm_b = iotests.VM(path_suffix='b').add_drive(disk)

        self.vm_b.add_incoming("exec: cat '" + migfile + "'")

    def test_migration(self):

        result = self.vm_a.qmp('migrate', uri='exec:cat>' + migfile)

        self.assert_qmp(result, 'return', {});

        self.assertNotEqual(self.vm_a.event_wait("STOP"), None)

        with open(disk, 'r+b') as f:

            f.seek(88) # first byte of autoclear_features field

            f.write(b'\xff')

        self.vm_b.launch()

        while True:

            result = self.vm_b.qmp('query-status')

            if result['return']['status'] == 'running':

                break

        with open(disk, 'rb') as f:

            f.seek(88)

            self.assertEqual(f.read(1), b'\x00')

if __name__ == '__main__':

    iotests.main(supported_fmts=['qcow2'])

.

----------------------------------------------------------------------

Ran 1 tests

OK

192 rw auto quick

194 rw auto migration quick

195 rw auto quick

196 rw auto quick

197 rw auto quick

198 rw auto