remove-bitmap-from-backing

#!/usr/bin/env python3
#
# Test removing persistent bitmap from backing
#
# Copyright (c) 2021 Virtuozzo 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 iotests
from iotests import log, qemu_img_create, qemu_img, qemu_img_pipe

iotests.script_initialize(supported_fmts=['qcow2'],
                          unsupported_imgopts=['compat'])

top, base = iotests.file_path('top', 'base')
size = '1M'

assert qemu_img_create('-f', iotests.imgfmt, base, size) == 0
assert qemu_img_create('-f', iotests.imgfmt, '-b', base,
                       '-F', iotests.imgfmt, top, size) == 0

assert qemu_img('bitmap', '--add', base, 'bitmap0') == 0
# Just assert that our method of checking bitmaps in the image works.
assert 'bitmaps' in qemu_img_pipe('info', base)

vm = iotests.VM().add_drive(top, 'backing.node-name=base')
vm.launch()

log('Trying to remove persistent bitmap from r-o base node, should fail:')
vm.qmp_log('block-dirty-bitmap-remove', node='base', name='bitmap0')

new_base_opts = {
    'options': [{
        'node-name': 'base',
        'driver': 'qcow2',
        'file': {
            'driver': 'file',
            'filename':  base
        },
        'read-only': False
    }]
}

# Don't want to bother with filtering qmp_log for reopen command
result = vm.qmp('blockdev-reopen', **new_base_opts)
if result != {'return': {}}:
    log('Failed to reopen: ' + str(result))

log('Remove persistent bitmap from base node reopened to RW:')
vm.qmp_log('block-dirty-bitmap-remove', node='base', name='bitmap0')

new_base_opts['options'][0]['read-only'] = True
result = vm.qmp('blockdev-reopen', **new_base_opts)
if result != {'return': {}}:
    log('Failed to reopen: ' + str(result))

vm.shutdown()

if 'bitmaps' in qemu_img_pipe('info', base):
    log('ERROR: Bitmap is still in the base image')