iotests: add 208 nbd-server + blockdev-snapshot-sync test case

This test case adds an NBD server export and then invokes
blockdev-snapshot-sync, which changes the BlockDriverState node that the
NBD server's BlockBackend points to.  This is an interesting scenario to
test and exercises the code path fixed by the previous commit.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20180306204819.11266-3-stefanha@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2018-03-12 16:04:39 -05:00 committed by Eric Blake
parent d03654eacd
commit 44a8174e0a
3 changed files with 65 additions and 0 deletions

55
tests/qemu-iotests/208 Executable file
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@ -0,0 +1,55 @@
#!/usr/bin/env python
#
# Copyright (C) 2018 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/>.
#
# Creator/Owner: Stefan Hajnoczi <stefanha@redhat.com>
#
# Check that the runtime NBD server does not crash when stopped after
# blockdev-snapshot-sync.
import iotests
with iotests.FilePath('disk.img') as disk_img_path, \
iotests.FilePath('disk-snapshot.img') as disk_snapshot_img_path, \
iotests.FilePath('nbd.sock') as nbd_sock_path, \
iotests.VM() as vm:
img_size = '10M'
iotests.qemu_img_pipe('create', '-f', iotests.imgfmt, disk_img_path, img_size)
iotests.log('Launching VM...')
(vm.add_drive(disk_img_path, 'node-name=drive0-node', interface='none')
.launch())
iotests.log('Starting NBD server...')
iotests.log(vm.qmp('nbd-server-start', addr={
"type": "unix",
"data": {
"path": nbd_sock_path,
}
}))
iotests.log('Adding NBD export...')
iotests.log(vm.qmp('nbd-server-add', device='drive0-node', writable=True))
iotests.log('Creating external snapshot...')
iotests.log(vm.qmp('blockdev-snapshot-sync',
node_name='drive0-node',
snapshot_node_name='drive0-snapshot-node',
snapshot_file=disk_snapshot_img_path))
iotests.log('Stopping NBD server...')
iotests.log(vm.qmp('nbd-server-stop'))

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Launching VM...
Starting NBD server...
{u'return': {}}
Adding NBD export...
{u'return': {}}
Creating external snapshot...
{u'return': {}}
Stopping NBD server...
{u'return': {}}

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@ -204,3 +204,4 @@
205 rw auto quick
206 rw auto
207 rw auto
208 rw auto quick