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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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+'''Extension responsible for qvm-service framework'''
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+
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+import qubes.ext
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+
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+class ServicesExtension(qubes.ext.Extension):
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+ '''This extension export features with 'service.' prefix to QubesDB in
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+ /qubes-service/ tree.
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+ '''
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+ # pylint: disable=no-self-use
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+ @qubes.ext.handler('domain-qdb-create')
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+ def on_domain_qdb_create(self, vm):
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+ '''Actually export features'''
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+ for feature, value in vm.features.items():
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+ if not feature.startswith('service.'):
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+ continue
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+ service = feature[len('service.'):]
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+ # forcefully convert to '0' or '1'
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+ vm.untrusted_qdb.write('/qubes-service/{}'.format(service),
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+ str(int(bool(value))))
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+
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+ @qubes.ext.handler('domain-feature-set')
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+ def on_domain_feature_set(self, vm, feature, value, oldvalue=None):
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+ '''Update /qubes-service/ QubesDB tree in runtime'''
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+ # pylint: disable=unused-argument
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+ if not vm.is_running():
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+ return
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+ if not feature.startswith('service.'):
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+ return
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+ service = feature[len('service.'):]
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+ # forcefully convert to '0' or '1'
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+ vm.untrusted_qdb.write('/qubes-service/{}'.format(service),
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+ str(int(bool(value))))
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+
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+ @qubes.ext.handler('domain-feature-delete')
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+ def on_domain_feature_delete(self, vm, feature):
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+ '''Update /qubes-service/ QubesDB tree in runtime'''
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+ if not vm.is_running():
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+ return
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+ if not feature.startswith('service.'):
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+ return
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+ service = feature[len('service.'):]
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+ vm.untrusted_qdb.rm('/qubes-service/{}'.format(service))
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