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+# -*- 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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+
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+import qubes.events
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+
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+class DVMTemplateMixin(qubes.events.Emitter):
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+ '''VM class capable of being DVM template'''
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+
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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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+
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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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+
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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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+
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+ @qubes.events.handler('property-pre-set:template')
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+ def __on_property_pre_set_template(self, event, name, newvalue,
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+ oldvalue=None):
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+ # pylint: disable=unused-argument
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+ if any(self.dispvms):
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+ raise qubes.exc.QubesVMInUseError(self,
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+ 'Cannot change template '
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+ 'while there are DispVMs based on this qube')
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+
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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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