def create(self, pause=False, **kwargs):
args = ["xl", "create"]
if pause:
args += ["-p"]
args += [self._cfg_path]
logging.info(f"Creating VM {self.vm_name}")
try_run(args, f"Failed to launch VM {self.vm_name}", **kwargs)
def restore(self, snapshot_path=None, pause=False, **kwargs) -> None:
"""Restore virtual machine from snapshot.
:raises: subprocess.CalledProcessError
"""
if self.is_running:
self.destroy()
args = ["xl", "restore"]
if snapshot_path is None:
snapshot_path = Path(VOLUME_DIR) / "snapshot.sav"
if pause is True:
args += ["-p"]
if kwargs.get("stderr") is None:
kwargs["stderr"] = subprocess.STDOUT
# we are explicitely passing stdout=None so that things can be print to terminal
kwargs["stdout"] = kwargs.get("stdout")
# No need to rollback vm-0. Since the state of vm-0
# is correct by definition.
if self.vm_id != 0 and self.backend is not None and self.vm_id is not None:
self.backend.rollback_vm_storage(self.vm_id)
args += [self._cfg_path, snapshot_path]
logging.info(f"Restoring VM {self.vm_name}")
try_run(args, msg=f"Failed to restore VM {self.vm_name}", **kwargs)
def unpause(self, **kwargs):
logging.info(f"Unpausing VM {self.vm_name}")
try_run(
["xl", "unpause", self.vm_name],
f"Failed to unpause VM {self.vm_name}",
**kwargs,
)
def destroy(self, **kwargs):
"""Destroy a running virtual machine.
:raises: subprocess.CalledProcessError
"""
if self.is_running:
logging.info(f"Destroying {self.vm_name}")
try_run(
["xl", "destroy", self.vm_name],
f"Failed to destroy VM {self.vm_name}",
**kwargs,
)
def save(self, filename, pause=False, cont=False, **kwargs):
logging.info(f"Saving VM {self.vm_name}")
args = ["xl", "save"]
# no such args will shutdown the VM after saving
if pause is True:
args += ["-p"]
elif cont is True:
args += ["-c"]
if kwargs.get("stderr") is None:
kwargs["stderr"] = subprocess.STDOUT
# we are explicitely passing stdout=None so that things can be print to terminal
kwargs["stdout"] = kwargs.get("stdout")
args += [self.vm_name, filename]
try_run(args, f"Failed to save VM {self.vm_name}", **kwargs)