277 lines
9.8 KiB
Python
277 lines
9.8 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) 2016 Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
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# Copyright (C) 2016 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 Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 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 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 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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'''Qubes volume and block device managment'''
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import argparse
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import os
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import sys
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import qubesadmin
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import qubesadmin.exc
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import qubesadmin.tools
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import qubesadmin.devices
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def prepare_table(dev_list):
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''' Converts a list of :py:class:`qubes.devices.DeviceInfo` objects to a
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list of tupples for the :py:func:`qubes.tools.print_table`.
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If :program:`qvm-devices` is running in a TTY, it will ommit duplicate
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data.
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:param iterable dev_list: List of :py:class:`qubes.devices.DeviceInfo`
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objects.
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:returns: list of tupples
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'''
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output = []
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header = []
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if sys.stdout.isatty():
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header += [('BACKEND:DEVID', 'DESCRIPTION', 'USED BY')] # NOQA
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for line in dev_list:
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output += [(
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line.ident,
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line.description,
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str(line.assignments),
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)]
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return header + sorted(output)
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class Line(object):
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'''Helper class to hold single device info for listing'''
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# pylint: disable=too-few-public-methods
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def __init__(self, device: qubesadmin.devices.DeviceInfo, attached_to=None):
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self.ident = "{!s}:{!s}".format(device.backend_domain, device.ident)
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self.description = device.description
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self.attached_to = attached_to if attached_to else ""
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self.frontends = []
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@property
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def assignments(self):
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'''list of frontends the device is assigned to'''
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return ', '.join(self.frontends)
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def list_devices(args):
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''' Called by the parser to execute the qubes-devices list
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subcommand. '''
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app = args.app
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devices = set()
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if hasattr(args, 'domains') and args.domains:
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for domain in args.domains:
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for dev in domain.devices[args.devclass].attached():
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devices.add(dev)
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for dev in domain.devices[args.devclass].available():
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devices.add(dev)
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else:
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for domain in app.domains:
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for dev in domain.devices[args.devclass].available():
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devices.add(dev)
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result = {dev: Line(dev) for dev in devices}
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for dev in result:
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for domain in app.domains:
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if domain == dev.backend_domain:
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continue
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for assignment in domain.devices[args.devclass].assignments():
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if dev != assignment:
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continue
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if assignment.options:
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result[dev].frontends.append('{!s} ({})'.format(
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domain, ', '.join('{}={}'.format(key, value)
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for key, value in assignment.options.items())))
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else:
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result[dev].frontends.append(str(domain))
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qubesadmin.tools.print_table(prepare_table(result.values()))
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def attach_device(args):
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''' Called by the parser to execute the :program:`qvm-devices attach`
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subcommand.
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'''
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device_assignment = args.device_assignment
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vm = args.domains[0]
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options = dict(opt.split('=', 1) for opt in args.option or [])
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if args.ro:
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options['read-only'] = 'yes'
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device_assignment.persistent = args.persistent
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device_assignment.options = options
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vm.devices[args.devclass].attach(device_assignment)
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def detach_device(args):
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''' Called by the parser to execute the :program:`qvm-devices detach`
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subcommand.
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'''
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vm = args.domains[0]
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if args.device_assignment:
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vm.devices[args.devclass].detach(args.device_assignment)
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else:
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for device_assignment in vm.devices[args.devclass].assignments():
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vm.devices[args.devclass].detach(device_assignment)
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def init_list_parser(sub_parsers):
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''' Configures the parser for the :program:`qvm-devices list` subcommand '''
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# pylint: disable=protected-access
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list_parser = sub_parsers.add_parser('list', aliases=('ls', 'l'),
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help='list devices')
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vm_name_group = qubesadmin.tools.VmNameGroup(
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list_parser, required=False, vm_action=qubesadmin.tools.VmNameAction,
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help='list devices assigned to specific domain(s)')
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list_parser._mutually_exclusive_groups.append(vm_name_group)
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list_parser.set_defaults(func=list_devices)
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class DeviceAction(qubesadmin.tools.QubesAction):
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''' Action for argument parser that gets the
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:py:class:``qubesadmin.device.DeviceAssignment`` from a
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BACKEND:DEVICE_ID string.
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''' # pylint: disable=too-few-public-methods
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def __init__(self, help='A backend & device id combination',
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required=True, allow_unknown=False, **kwargs):
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# pylint: disable=redefined-builtin
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self.allow_unknown = allow_unknown
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super(DeviceAction, self).__init__(help=help, required=required,
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**kwargs)
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def __call__(self, parser, namespace, values, option_string=None):
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''' Set ``namespace.device_assignment`` to ``values`` '''
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setattr(namespace, self.dest, values)
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def parse_qubes_app(self, parser, namespace):
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app = namespace.app
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backend_device_id = getattr(namespace, self.dest)
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devclass = namespace.devclass
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if backend_device_id is None:
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return
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try:
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vmname, device_id = backend_device_id.split(':', 1)
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try:
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vm = app.domains[vmname]
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except KeyError:
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parser.error_runtime("no backend vm {!r}".format(vmname))
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try:
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dev = vm.devices[devclass][device_id]
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if not self.allow_unknown and isinstance(dev,
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qubesadmin.devices.UnknownDevice):
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raise KeyError(device_id)
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except KeyError:
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parser.error_runtime(
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"backend vm {!r} doesn't expose device {!r}"
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.format(vmname, device_id))
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device_assignment = qubesadmin.devices.DeviceAssignment(vm,
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device_id)
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setattr(namespace, self.dest, device_assignment)
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except ValueError:
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parser.error('expected a backend vm & device id combination ' \
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'like foo:bar got %s' % backend_device_id)
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def get_parser(device_class=None):
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'''Create :py:class:`argparse.ArgumentParser` suitable for
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:program:`qvm-block`.
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'''
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parser = qubesadmin.tools.QubesArgumentParser(description=__doc__,
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want_app=True)
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parser.register('action', 'parsers',
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qubesadmin.tools.AliasedSubParsersAction)
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if device_class:
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parser.add_argument('devclass', const=device_class,
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action='store_const',
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help=argparse.SUPPRESS)
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else:
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parser.add_argument('devclass', metavar='DEVICE_CLASS', action='store',
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help="Device class to manage ('pci', 'usb', etc)")
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# default action
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parser.set_defaults(func=list_devices)
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sub_parsers = parser.add_subparsers(
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title='commands',
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description="For more information see qvm-device command -h",
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dest='command')
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init_list_parser(sub_parsers)
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attach_parser = sub_parsers.add_parser(
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'attach', help="Attach device to domain", aliases=('at', 'a'))
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detach_parser = sub_parsers.add_parser(
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"detach", help="Detach device from domain", aliases=('d', 'dt'))
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attach_parser.add_argument('VMNAME', nargs=1,
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action=qubesadmin.tools.VmNameAction)
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detach_parser.add_argument('VMNAME', nargs=1,
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action=qubesadmin.tools.VmNameAction)
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attach_parser.add_argument(metavar='BACKEND:DEVICE_ID',
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dest='device_assignment',
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action=DeviceAction)
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detach_parser.add_argument(metavar='BACKEND:DEVICE_ID',
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dest='device_assignment', nargs=argparse.OPTIONAL,
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action=DeviceAction, allow_unknown=True)
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attach_parser.add_argument('--option', '-o', action='append',
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help="Set option for the device in opt=value form (can be specified "
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"multiple times), see man qvm-device for details")
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attach_parser.add_argument('--ro', action='store_true', default=False,
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help="Attach device read-only (alias for read-only=yes option, "
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"takes precedence)")
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attach_parser.add_argument('--persistent', '-p', action='store_true',
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default=False,
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help="Attach device persistently (so it will be automatically "
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"attached at qube startup)")
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attach_parser.set_defaults(func=attach_device)
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detach_parser.set_defaults(func=detach_device)
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return parser
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def main(args=None, app=None):
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'''Main routine of :program:`qvm-block`.'''
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basename = os.path.basename(sys.argv[0])
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devclass = None
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if basename.startswith('qvm-') and basename != 'qvm-device':
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devclass = basename[4:]
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args = get_parser(devclass).parse_args(args, app=app)
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try:
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args.func(args)
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except qubesadmin.exc.QubesException as e:
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print(str(e), file=sys.stderr)
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return 1
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return 0
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if __name__ == '__main__':
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sys.exit(main())
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