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+# -*- encoding: utf8 -*-
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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) 2019 Marek Marczykowski-Górecki
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+# <marmarek@invisiblethingslab.com>
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+#
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+# This library is free software; you can redistribute it and/or
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+# modify it under the terms of the GNU Lesser General Public
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+# License as published by the Free Software Foundation; either
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+# version 2.1 of the License, or (at your option) any later version.
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+#
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+# This library 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 GNU
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+# Lesser General Public License for more details.
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+#
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+# You should have received a copy of the GNU Lesser General Public
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+# License along with this library; if not, see <https://www.gnu.org/licenses/>.
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+
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+"""
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+Backup restore related functionality. Specifically:
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+ - prevent starting a domain currently being restored
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+"""
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+
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+import qubes.api
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+import qubes.ext
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+import qubes.vm.adminvm
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+
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+
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+class BackupRestoreExtension(qubes.ext.Extension):
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+ # pylint: disable=too-few-public-methods
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+ @qubes.ext.handler('domain-pre-start')
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+ def on_domain_pre_start(self, vm, event, **kwargs):
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+ """Prevent starting a VM during restore"""
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+ # pylint: disable=unused-argument,no-self-use
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+ if 'backup-restore-in-progress' in vm.tags:
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+ raise qubes.exc.QubesVMError(
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+ vm, 'Restore of this domain in progress, cannot start')
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