def revert(self, name=None, destroy=True):
"""Method to revert node in state from snapshot
For external snapshots in libvirt we use restore function.
After reverting in this way we get situation when node is connected
to original volume disk, without snapshot point. To solve this
problem we need to switch it to correct volume.
In case of usage external snapshots we clean snapshot disk when
revert to snapshot without childs and create new snapshot point
when reverting to snapshots with childs.
"""
if destroy:
self.destroy()
if self.has_snapshot(name):
snapshot = self._get_snapshot(name)
if snapshot.get_type == 'external':
# EXTERNAL SNAPSHOT
self._revert_external_snapshot(name)
else:
# ORIGINAL SNAPSHOT
logger.info("Revert {0} ({1}) to internal snapshot {2}".format(
self.name, snapshot.state, name))
self._libvirt_node.revertToSnapshot(snapshot._snapshot, 0)
else:
raise DevopsError(
'Domain snapshot for {0} node not found: no domain '
'snapshot with matching'
' name {1}'.format(self.name, name))
def create(cls, name):
"""Create Environment instance with given name.
:rtype: devops.models.Environment
"""
try:
return cls.objects.create(name=name)
except IntegrityError:
raise DevopsError('Environment with name {!r} already exists'
''.format(name))
