#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2015 Wojtek Porczyk <woju@invisiblethingslab.com>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, see <https://www.gnu.org/licenses/>.
#
'''
Qubes OS exception hierarchy
'''
[docs]
class QubesException(Exception):
'''Exception that can be shown to the user'''
[docs]
class QubesVMNotFoundError(QubesException, KeyError):
'''Domain cannot be found in the system'''
def __init__(self, vmname):
super().__init__(
'No such domain: {!r}'.format(vmname))
self.vmname = vmname
def __str__(self):
# KeyError overrides __str__ method
return QubesException.__str__(self)
[docs]
class QubesVMError(QubesException):
'''Some problem with domain state.'''
def __init__(self, vm, msg):
super().__init__(msg)
self.vm = vm
[docs]
class QubesVMInUseError(QubesVMError):
'''VM is in use, cannot remove.'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain is in use: {!r}'.format(vm.name))
[docs]
class QubesVMNotStartedError(QubesVMError):
'''Domain is not started.
This exception is thrown when machine is halted, but should be started
(that is, either running or paused).
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain is powered off: {!r}'.format(vm.name))
[docs]
class QubesVMNotRunningError(QubesVMNotStartedError):
'''Domain is not running.
This exception is thrown when machine should be running but is either
halted or paused.
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain not running (either powered off or paused): {!r}' \
.format(vm.name))
[docs]
class QubesVMNotPausedError(QubesVMNotStartedError):
'''Domain is not paused.
This exception is thrown when machine should be paused, but is not.
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain is not paused: {!r}'.format(vm.name))
[docs]
class QubesVMNotSuspendedError(QubesVMError):
'''Domain is not suspended.
This exception is thrown when machine should be suspended but is either
halted or running.
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain is not suspended: {!r}'.format(vm.name))
[docs]
class QubesVMNotHaltedError(QubesVMError):
'''Domain is not halted.
This exception is thrown when machine should be halted, but is not (either
running or paused).
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain is not powered off: {!r}'.format(vm.name))
[docs]
class QubesVMShutdownTimeoutError(QubesVMError):
'''Domain shutdown timed out.
'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Domain shutdown timed out: {!r}'.format(vm.name))
[docs]
class QubesNoTemplateError(QubesVMError):
'''Cannot start domain, because there is no template'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Template for the domain {!r} not found'.format(vm.name))
[docs]
class QubesPoolInUseError(QubesException):
'''VM is in use, cannot remove.'''
def __init__(self, pool, msg=None):
super().__init__(
msg or 'Storage pool is in use: {!r}'.format(pool.name))
[docs]
class QubesValueError(QubesException, ValueError):
'''Cannot set some value, because it is invalid, out of bounds, etc.'''
[docs]
class QubesPropertyValueError(QubesValueError):
'''Cannot set value of qubes.property, because user-supplied value is wrong.
'''
def __init__(self, holder, prop, value, msg=None):
super().__init__(
msg or 'Invalid value {!r} for property {!r} of {!r}'.format(
value, prop.__name__, holder))
self.holder = holder
self.prop = prop
self.value = value
[docs]
class QubesNoSuchPropertyError(QubesException, AttributeError):
'''Requested property does not exist
'''
def __init__(self, holder, prop_name, msg=None):
super().__init__(
msg or 'Invalid property {!r} of {!s}'.format(
prop_name, holder))
self.holder = holder
self.prop = prop_name
[docs]
class QubesNotImplementedError(QubesException, NotImplementedError):
'''Thrown at user when some feature is not implemented'''
def __init__(self, msg=None):
super().__init__(
msg or 'This feature is not available')
[docs]
class BackupCancelledError(QubesException):
'''Thrown at user when backup was manually cancelled'''
def __init__(self, msg=None):
super().__init__(
msg or 'Backup cancelled')
[docs]
class BackupAlreadyRunningError(QubesException):
'''Thrown at user when they try to run the same backup twice at
the same time'''
def __init__(self, msg=None):
super().__init__(
msg or 'Backup already running')
[docs]
class QubesMemoryError(QubesVMError, MemoryError):
'''Cannot start domain, because not enough memory is available'''
def __init__(self, vm, msg=None):
super().__init__(vm,
msg or 'Not enough memory to start domain {!r}'.format(vm.name))
[docs]
class QubesFeatureNotFoundError(QubesException, KeyError):
'''Feature not set for a given domain'''
def __init__(self, domain, feature):
super().__init__(
'Feature not set for domain {}: {}'.format(domain, feature))
self.feature = feature
self.vm = domain
def __str__(self):
# KeyError overrides __str__ method
return QubesException.__str__(self)
[docs]
class QubesTagNotFoundError(QubesException, KeyError):
'''Tag not set for a given domain'''
def __init__(self, domain, tag):
super().__init__('Tag not set for domain {}: {}'.format(
domain, tag))
self.vm = domain
self.tag = tag
def __str__(self):
# KeyError overrides __str__ method
return QubesException.__str__(self)
[docs]
class QubesLabelNotFoundError(QubesException, KeyError):
"""Label does not exists"""
def __init__(self, label):
super().__init__('Label does not exist: {}'.format(label))
self.label = label
def __str__(self):
# KeyError overrides __str__ method
return QubesException.__str__(self)