72 lines
2.7 KiB
Python
72 lines
2.7 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2017 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, see <http://www.gnu.org/licenses/>.
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import qubes.events
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class DVMTemplateMixin(qubes.events.Emitter):
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'''VM class capable of being DVM template'''
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template_for_dispvms = qubes.property('template_for_dispvms',
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type=bool,
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default=False,
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doc='Should this VM be allowed to start as Disposable VM')
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@qubes.events.handler('property-pre-set:template_for_dispvms')
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def __on_pre_set_dvmtemplate(self, event, name,
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newvalue, oldvalue=None):
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# pylint: disable=unused-argument
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if newvalue:
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return
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if any(self.dispvms):
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raise qubes.exc.QubesVMInUseError(self,
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'Cannot change template_for_dispvms to False while there are '
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'some DispVMs based on this DVM template')
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@qubes.events.handler('property-pre-del:template_for_dispvms')
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def __on_pre_del_dvmtemplate(self, event, name,
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oldvalue=None):
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self.__on_pre_set_dvmtemplate(
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event, name, False, oldvalue)
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@qubes.events.handler('property-pre-set:template')
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def __on_pre_property_set_template(self, event, name, newvalue,
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oldvalue=None):
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# pylint: disable=unused-argument
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for vm in self.dispvms:
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if vm.is_running():
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raise qubes.exc.QubesVMNotHaltedError(self,
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'Cannot change template while there are running DispVMs '
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'based on this DVM template')
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@qubes.events.handler('property-set:template')
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def __on_property_set_template(self, event, name, newvalue,
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oldvalue=None):
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# pylint: disable=unused-argument
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pass
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@property
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def dispvms(self):
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''' Returns a generator containing all Disposable VMs based on the
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current AppVM.
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'''
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for vm in self.app.domains:
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if getattr(vm, 'template', None) == self:
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yield vm
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