#!/usr/bin/env python3
#
# Test mirror with unmap
#
# Copyright (C) 2015 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 time
import os
import iotests
from iotests import qemu_img, qemu_io

test_img = os.path.join(iotests.test_dir, 'test.img')
target_img = os.path.join(iotests.test_dir, 'target.img')

class TestSingleDrive(iotests.QMPTestCase):
    image_len = 2 * 1024 * 1024 # MB

    def setUp(self):
        # Write data to the image so we can compare later
        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestSingleDrive.image_len))
        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x5d 0 2M', test_img)

        self.vm = iotests.VM().add_drive(test_img, 'discard=unmap')
        self.vm.launch()

    def tearDown(self):
        self.vm.shutdown()
        os.remove(test_img)
        try:
            os.remove(target_img)
        except OSError:
            pass

    def test_mirror_discard(self):
        result = self.vm.qmp('drive-mirror', device='drive0', sync='full',
                             target=target_img)
        self.assert_qmp(result, 'return', {})
        self.vm.hmp_qemu_io('drive0', 'discard 0 64k')
        self.complete_and_wait('drive0')
        self.vm.shutdown()
        self.assertTrue(iotests.compare_images(test_img, target_img),
                        'target image does not match source after mirroring')

if __name__ == '__main__':
    iotests.main(supported_fmts=['raw', 'qcow2'],
                 supported_protocols=['file'])