def clean_for_disk(self, disk):
if not self.metadatas:
raise SnapshotNotStarted()
elif disk not in self.metadatas["disks"]:
raise DiskNotSnapshot(disk)
snapshot_path = os.path.abspath(
self.metadatas["disks"][disk]["snapshot"])
disk_path = os.path.abspath(self.metadatas["disks"][disk]["src"])
# Do not commit and pivot if our snapshot is not the current top disk
current_disk_path = (get_xml_block_of_disk(
self.dom.XMLDesc(), disk).xpath("source")[0].get("file"))
if os.path.abspath(current_disk_path) != snapshot_path:
logger.warning(
"It seems that the domain configuration (and specifically the "
"one related to its disks) has been changed. The current disk "
"will not be committed nor pivoted with the external "
"snapshot, to not break the backing chain.\n\n"
"You might want to manually check, where your domain image is "
"stored, if no temporary file is remaining ({}).".format(
os.path.dirname(current_disk_path)))
return
if self.dom.isActive():
self.blockcommit_disk(disk)
else:
self._qemu_img_commit(disk_path, snapshot_path)
self._manually_pivot_disk(disk, disk_path)
os.remove(snapshot_path)
self.metadatas["disks"].pop(disk)
self._callbacks_registrer.callbacks.pop(snapshot_path, None)
def create_temp_snapshot_files(self, tmpdir):
tmpdir = tmpdir.mkdir("snaps")
self.snapshot_helper.dom.set_storage_basedir(
os.path.abspath(str(tmpdir)))
snapshots = {}
# swap disk and snapshots, to just change the domain basedir
for disk, prop in self.snapshot_helper.disks.items():
dom_disk_path = (get_xml_block_of_disk(
self.snapshot_helper.dom.XMLDesc(),
disk)).xpath("source")[0].get("file")
tmpdir.join(os.path.basename(dom_disk_path)).write("")
prop["snapshot"] = dom_disk_path
disk_path = tmpdir.join("{}.qcow2.{}".format(disk, "123"))
prop["src"] = str(disk_path)
snapshots[disk] = prop["snapshot"]
return snapshots
def _manually_pivot_disk(self, disk, src):
"""
Replace the disk src
:param disk: disk name
:param src: new disk path
"""
dom_xml = defusedxml.lxml.fromstring(self.dom.XMLDesc())
disk_xml = get_xml_block_of_disk(dom_xml, disk)
disk_xml.xpath("source")[0].set("file", src)
if self.conn.getLibVersion() >= 3000000:
# update a disk is broken in libvirt < 3.0
return self.dom.updateDeviceFlags(
defusedxml.lxml.tostring(disk_xml).decode(),
libvirt.VIR_DOMAIN_AFFECT_CONFIG)
else:
return self.conn.defineXML(
defusedxml.lxml.tostring(dom_xml).decode())
def create_temp_snapshot_files(self, tmpdir):
tmpdir = tmpdir.mkdir("snaps")
self.snapshot_helper.dom.set_storage_basedir(
os.path.abspath(str(tmpdir))
)
snapshots = {}
# swap disk and snapshots, to just change the domain basedir
for disk, prop in self.snapshot_helper.disks.items():
dom_disk_path = (
get_xml_block_of_disk(self.snapshot_helper.dom.XMLDesc(), disk)
).xpath("source")[0].get("file")
tmpdir.join(os.path.basename(dom_disk_path)).write("")
prop["snapshot"] = dom_disk_path
disk_path = tmpdir.join("{}.qcow2.{}".format(disk, "123"))
prop["src"] = str(disk_path)
snapshots[disk] = prop["snapshot"]
return snapshots
def _manually_pivot_disk(self, disk, src):
"""
Replace the disk src
:param disk: disk name
:param src: new disk path
"""
dom_xml = defusedxml.lxml.fromstring(self.dom.XMLDesc())
disk_xml = get_xml_block_of_disk(dom_xml, disk)
disk_xml.xpath("source")[0].set("file", src)
if self.conn.getLibVersion() >= 3000000:
# update a disk is broken in libvirt < 3.0
return self.dom.updateDeviceFlags(
defusedxml.lxml.tostring(disk_xml).decode(),
libvirt.VIR_DOMAIN_AFFECT_CONFIG
)
else:
return self.conn.defineXML(
defusedxml.lxml.tostring(dom_xml).decode()
)
def clean_for_disk(self, disk):
if not self.metadatas:
raise SnapshotNotStarted()
elif disk not in self.metadatas["disks"]:
raise DiskNotSnapshot(disk)
snapshot_path = os.path.abspath(
self.metadatas["disks"][disk]["snapshot"]
)
disk_path = os.path.abspath(self.metadatas["disks"][disk]["src"])
# Do not commit and pivot if our snapshot is not the current top disk
current_disk_path = get_xml_block_of_disk(
self.dom.XMLDesc(), disk
).xpath("source")[0].get("file")
if os.path.abspath(current_disk_path) != snapshot_path:
logger.warning(
"It seems that the domain configuration (and specifically the "
"one related to its disks) has been changed. The current disk "
"will not be committed nor pivoted with the external "
"snapshot, to not break the backing chain.\n\n"
"You might want to manually check, where your domain image is "
"stored, if no temporary file is remaining ({}).".format(
os.path.dirname(current_disk_path)
)
)
return
if self.dom.isActive():
self.blockcommit_disk(disk)
else:
self._qemu_img_commit(disk_path, snapshot_path)
self._manually_pivot_disk(disk, disk_path)
os.remove(snapshot_path)
self.metadatas["disks"].pop(disk)
if not self.metadatas["disks"] and self._callback_id is not None:
self._deregister_callback()
def post_backup_cleaning_snapshot(self, disk, disk_path, snapshot_path):
snapshot_path = os.path.abspath(snapshot_path)
# Do not commit and pivot if our snapshot is not the current top disk
current_disk_path = get_xml_block_of_disk(
self.dom.XMLDesc(), disk).xpath("source")[0].get("file")
if os.path.abspath(current_disk_path) != snapshot_path:
logger.warning(
"It seems that the domain configuration (and specifically the "
"one related to its disks) has been changed. The current disk "
"will not be committed nor pivoted with the external "
"snapshot, to not break the backing chain.\n\n"
"You might want to manually check, where your domain image is "
"stored, if no temporary file is remaining ({}).".format(
os.path.dirname(current_disk_path)))
return
if self.dom.isActive():
self._blockcommit_disk(disk)
else:
self._qemu_img_commit(disk_path, snapshot_path)
self._manually_pivot_disk(disk, disk_path)
def get_src_for_disk(self, dom_xml, disk):
elem = get_xml_block_of_disk(dom_xml, disk)
return elem.xpath("source")[0].get("file")
def get_src_for_disk(self, dom_xml, disk):
elem = get_xml_block_of_disk(dom_xml, disk)
return elem.xpath("source")[0].get("file")