def rebaseVolumeRollback(cls, taskObj, sdUUID, srcImg, srcVol, dstFormat,
srcParent, unsafe):
"""
Rebase volume rollback
"""
cls.log.info(
'rebase volume rollback (sdUUID=%s srcImg=%s srcVol=%s '
'dstFormat=%s srcParent=%s)', sdUUID, srcImg, srcVol, dstFormat,
srcParent)
imageResourcesNamespace = sd.getNamespace(sc.IMAGE_NAMESPACE, sdUUID)
with rm.acquireResource(imageResourcesNamespace, srcImg, rm.EXCLUSIVE):
vol = sdCache.produce(sdUUID).produceVolume(srcImg, srcVol)
vol.prepare(rw=True, chainrw=True, setrw=True)
volumePath = vol.getVolumePath()
backingVolPath = getBackingVolumePath(srcImg, srcParent)
try:
qemuimg.rebase(volumePath, backingVolPath,
sc.fmt2str(vol.getFormat()),
sc.fmt2str(int(dstFormat)),
misc.parseBool(unsafe), vars.task.aborting)
vol.setParent(srcParent)
vol.recheckIfLeaf()
except qemuimg.QImgError:
cls.log.exception(
'cannot rollback rebase for volume %s on '
'%s', volumePath, backingVolPath)
raise se.MergeVolumeRollbackError(srcVol)
finally:
vol.teardown(sdUUID, srcVol)
def rebase(self, backingVol, backingVolPath, backingFormat, unsafe,
rollback):
"""
Rebase volume on top of new backing volume
"""
if rollback:
pvol = self.getParentVolume()
if not pvol:
self.log.warn("Can't rebase volume %s, parent missing",
self.volUUID)
return
name = "Merge volume: " + self.volUUID
vars.task.pushRecovery(
task.Recovery(name, "volume", "Volume",
"rebaseVolumeRollback",
[self.sdUUID, self.getImage(),
self.volUUID, str(pvol.getFormat()),
pvol.volUUID, str(True)]))
volumePath = self.getVolumePath()
try:
qemuimg.rebase(volumePath, backingVolPath,
fmt2str(self.getFormat()), fmt2str(backingFormat),
unsafe, vars.task.aborting)
except qemuimg.QImgError:
self.log.exception('cannot rebase volume %s on %s', volumePath,
backingVolPath)
raise se.MergeSnapshotsError(self.volUUID)
self.setParent(backingVol)
self.recheckIfLeaf()
def rebaseVolumeRollback(cls, taskObj, sdUUID, srcImg,
srcVol, dstFormat, srcParent, unsafe):
"""
Rebase volume rollback
"""
cls.log.info('rebase volume rollback (sdUUID=%s srcImg=%s srcVol=%s '
'dstFormat=%s srcParent=%s)', sdUUID, srcImg, srcVol,
dstFormat, srcParent)
imageResourcesNamespace = sd.getNamespace(
sdUUID,
resourceFactories.IMAGE_NAMESPACE)
with rmanager.acquireResource(imageResourcesNamespace,
srcImg, rm.LockType.exclusive):
vol = sdCache.produce(sdUUID).produceVolume(srcImg, srcVol)
vol.prepare(rw=True, chainrw=True, setrw=True)
volumePath = vol.getVolumePath()
backingVolPath = getBackingVolumePath(srcImg, srcParent)
try:
qemuimg.rebase(volumePath, backingVolPath,
fmt2str(vol.getFormat()),
fmt2str(int(dstFormat)),
misc.parseBool(unsafe), vars.task.aborting)
vol.setParent(srcParent)
vol.recheckIfLeaf()
except qemuimg.QImgError:
cls.log.exception('cannot rollback rebase for volume %s on '
'%s', volumePath, backingVolPath)
raise se.MergeVolumeRollbackError(srcVol)
finally:
vol.teardown(sdUUID, srcVol)
def rebase(self, backingVol, backingVolPath, backingFormat, unsafe,
rollback):
"""
Rebase volume on top of new backing volume
"""
if rollback:
pvol = self.getParentVolume()
if not pvol:
self.log.warn("Can't rebase volume %s, parent missing",
self.volUUID)
return
name = "Merge volume: " + self.volUUID
vars.task.pushRecovery(
task.Recovery(name, "volume", "Volume", "rebaseVolumeRollback",
[
self.sdUUID,
self.getImage(), self.volUUID,
str(pvol.getFormat()), pvol.volUUID,
str(True)
]))
volumePath = self.getVolumePath()
try:
qemuimg.rebase(volumePath,
backingVolPath, fmt2str(self.getFormat()),
fmt2str(backingFormat), unsafe, vars.task.aborting)
except qemuimg.QImgError:
self.log.exception('cannot rebase volume %s on %s', volumePath,
backingVolPath)
raise se.MergeSnapshotsError(self.volUUID)
self.setParent(backingVol)
self.recheckIfLeaf()
def _update_qemu_metadata(dom, subchain):
children = subchain.top_vol.getChildren()
if children:
# Top has children, update qcow metadata by rebasing -u
child = dom.produceVolume(subchain.img_id,
children[0])
log.info("Updating qemu metadata, rebasing volume %s into "
"volume %s",
child.volUUID, subchain.base_vol.volUUID)
qemuimg.rebase(image=child.volumePath,
backing=subchain.base_vol.volumePath,
format=qemuimg.FORMAT.QCOW2,
backingFormat=qemuimg.FORMAT.QCOW2,
unsafe=True)
def _rebase_operation(base, child):
backing = volume.getBackingVolumePath(base.imgUUID, base.volUUID)
backing_format = sc.fmt2str(base.getFormat())
operation = qemuimg.rebase(image=child.volumePath,
backing=backing,
format=qemuimg.FORMAT.QCOW2,
backingFormat=backing_format,
unsafe=True)
return operation
def test_read_bad_chain_raises(self):
with namedTemporaryDir() as tmpdir:
# Create a good chain.
base_qcow2 = os.path.join(tmpdir, "base.qcow2")
qemuimg.create(base_qcow2, "1m", qemuimg.FORMAT.QCOW2)
top = os.path.join(tmpdir, "top.qcow2")
qemuimg.create(top, "1m", qemuimg.FORMAT.QCOW2, backing=base_qcow2,
backingFormat=qemuimg.FORMAT.QCOW2)
# Create a broken chain using unsafe rebase with the wrong backing
# format.
base_raw = os.path.join(tmpdir, "base.raw")
qemuimg.create(base_raw, "1m", qemuimg.FORMAT.RAW)
operation = qemuimg.rebase(top,
backing=base_raw,
format=qemuimg.FORMAT.QCOW2,
backingFormat=qemuimg.FORMAT.QCOW2,
unsafe=True)
operation.run()
with self.assertRaises(cmdutils.Error):
qemu_pattern_verify(top, qemuimg.FORMAT.QCOW2)
def test_read_bad_chain_raises(self):
with namedTemporaryDir() as tmpdir:
# Create a good chain.
base_qcow2 = os.path.join(tmpdir, "base.qcow2")
qemuimg.create(base_qcow2, "1m", qemuimg.FORMAT.QCOW2)
top = os.path.join(tmpdir, "top.qcow2")
qemuimg.create(top,
"1m",
qemuimg.FORMAT.QCOW2,
backing=base_qcow2,
backingFormat=qemuimg.FORMAT.QCOW2)
# Create a broken chain using unsafe rebase with the wrong backing
# format.
base_raw = os.path.join(tmpdir, "base.raw")
qemuimg.create(base_raw, "1m", qemuimg.FORMAT.RAW)
operation = qemuimg.rebase(top,
backing=base_raw,
format=qemuimg.FORMAT.QCOW2,
backingFormat=qemuimg.FORMAT.QCOW2,
unsafe=True)
operation.run()
with self.assertRaises(cmdutils.Error):
qemu_pattern_verify(top, qemuimg.FORMAT.QCOW2)
