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+#!/usr/bin/python2 -O
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+# vim: fileencoding=utf-8
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+
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+#
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+# The Qubes OS Project, https://www.qubes-os.org/
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+#
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+# Copyright (C) 2010-2016 Joanna Rutkowska <joanna@invisiblethingslab.com>
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+# Copyright (C) 2016 Wojtek Porczyk <woju@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, write to the Free Software Foundation, Inc.,
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+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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+#
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+
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+'''qvm-features - Manage domain's features'''
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+
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+import argparse
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+import qubes
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+
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+parser = qubes.tools.QubesArgumentParser(
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+ want_vm=True,
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+ description='manage domain\'s features')
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+
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+parser.add_argument('--request',
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+ action='store_true', default=False,
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+ help=argparse.SUPPRESS)
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+
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+parser.add_argument('feature', metavar='FEATURE',
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+ action='store', nargs='?',
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+ help='name of the feature')
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+
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+parser.add_argument('value', metavar='VALUE',
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+ action='store', nargs='?',
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+ help='new value of the feature')
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+
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+parser.add_argument('--unset', '--default', '--delete', '-D',
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+ dest='delete',
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+ action='store_true',
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+ help='unset the feature')
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+
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+
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+def main(args=None):
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+ '''Main routine of :program:`qvm-features`.
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+
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+ :param list args: Optional arguments to override those delivered from \
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+ command line.
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+ '''
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+
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+ args = parser.parse_args(args)
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+
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+ if args.request:
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+ # Request mode: instead of setting the features directly,
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+ # let the extensions handle them first.
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+ args.vm.fire_event('feature-request', untrusted_features=args.features)
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+ return 0
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+
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+ if args.feature is None:
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+ if args.delete:
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+ parser.error('--unset requires a feature')
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+
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+ width = max(len(feature) for feature in args.vm.features)
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+ for feature in sorted(args.vm.features):
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+ print('{name:{width}s} {value}'.format(
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+ name=feature, value=args.vm.features[feature], width=width))
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+
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+ return 0
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+
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+ if args.delete:
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+ if args.value is not None:
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+ parser.error('cannot both set and unset a value')
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+ try:
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+ del args.vm.features[args.feature]
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+ args.app.save()
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+ except KeyError:
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+ pass
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+ return 0
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+
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+ if args.value is None:
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+ try:
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+ print(args.vm.features[args.feature])
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+ return 0
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+ except KeyError:
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+ return 1
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+
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+ args.vm.features[args.feature] = args.value
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+ args.app.save()
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+ return 0
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+
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+
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+if __name__ == '__main__':
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+ sys.exit(main())
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Wojtek Porczyk