#!/usr/bin/python2 -O
# vim: fileencoding=utf-8
#
# The Qubes OS Project, https://www.qubes-os.org/
#
# Copyright (C) 2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
# Copyright (C) 2015 Wojtek Porczyk <woju@invisiblethingslab.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
'''Qubes' command line tools
'''
import argparse
import importlib
import logging
import os
import qubes.log
class PropertyAction(argparse.Action):
'''Action for argument parser that stores a property.'''
# pylint: disable=redefined-builtin,too-few-public-methods
def __init__(self,
option_strings,
dest,
metavar='NAME=VALUE',
required=False,
help='set property to a value'):
super(PropertyAction, self).__init__(option_strings, 'properties',
metavar=metavar, default={}, help=help)
def __call__(self, parser, namespace, values, option_string=None):
try:
prop, value = values.split('=', 1)
except ValueError:
parser.error('invalid property token: {!r}'.format(values))
getattr(namespace, self.dest)[prop] = value
class SinglePropertyAction(argparse.Action):
'''Action for argument parser that stores a property.'''
# pylint: disable=redefined-builtin,too-few-public-methods
def __init__(self,
option_strings,
dest,
metavar='VALUE',
const=None,
nargs=None,
required=False,
help=None):
if help is None:
help = 'set {!r} property to a value'.format(dest)
if const is not None:
help += ' {!r}'.format(const)
if const is not None:
nargs = 0
super(SinglePropertyAction, self).__init__(option_strings, 'properties',
metavar=metavar, help=help, default={}, const=const,
nargs=nargs)
self.name = dest
def __call__(self, parser, namespace, values, option_string=None):
getattr(namespace, self.dest)[self.name] = values \
if self.const is None else self.const
class QubesArgumentParser(argparse.ArgumentParser):
'''Parser preconfigured for use in most of the Qubes command-line tools.
:param bool want_app: instantiate :py:class:`qubes.Qubes` object
:param bool want_app_no_instance: don't actually instantiate \
:py:class:`qubes.Qubes` object, just add argument for custom xml file
:param bool want_force_root: add ``--force-root`` option
:param bool want_vm: add ``VMNAME`` as first positional argument
*kwargs* are passed to :py:class:`argparser.ArgumentParser`.
Currenty supported options:
``--force-root`` (optional)
``--qubesxml`` location of :file:`qubes.xml` (help is suppressed)
``--verbose`` and ``--quiet``
'''
def __init__(self,
want_app=True,
want_app_no_instance=False,
want_force_root=False,
want_vm=False,
**kwargs):
super(QubesArgumentParser, self).__init__(**kwargs)
self._want_app = want_app
self._want_app_no_instance = want_app_no_instance
self._want_force_root = want_force_root
self._want_vm = want_vm
if self._want_app:
self.add_argument('--qubesxml', metavar='FILE',
action='store', dest='app',
help=argparse.SUPPRESS)
self.add_argument('--verbose', '-v',
action='count',
help='increase verbosity')
self.add_argument('--quiet', '-q',
action='count',
help='decrease verbosity')
if self._want_force_root:
self.add_argument('--force-root',
action='store_true', default=False,
help='force to run as root')
if self._want_vm:
self.add_argument('vm', metavar='VMNAME',
action='store',
help='name of the domain')
self.set_defaults(verbose=1, quiet=0)
def parse_args(self, *args, **kwargs):
namespace = super(QubesArgumentParser, self).parse_args(*args, **kwargs)
if self._want_app and not self._want_app_no_instance:
self.set_qubes_verbosity(namespace)
namespace.app = qubes.Qubes(namespace.app)
if self._want_vm:
try:
namespace.vm = namespace.app.domains[namespace.vm]
except KeyError:
self.error('no such domain: {!r}'.format(namespace.vm))
if self._want_force_root:
self.dont_run_as_root(namespace)
return namespace
def error_runtime(self, message):
'''Runtime error, without showing usage.
:param str message: message to show
'''
self.exit(1, '{}: error: {}\n'.format(self.prog, message))
def dont_run_as_root(self, namespace):
'''Prevent running as root.
:param argparse.Namespace args: if there is ``.force_root`` attribute \
set to true, run anyway
'''
try:
euid = os.geteuid()
except AttributeError: # no geteuid(), probably NT
return
if euid == 0 and not namespace.force_root:
self.error_runtime(
'refusing to run as root; add --force-root to override')
@staticmethod
def get_loglevel_from_verbosity(namespace):
return (namespace.quiet - namespace.verbose) * 10 + logging.WARNING
@staticmethod
def set_qubes_verbosity(namespace):
'''Apply a verbosity setting.
This is done by configuring global logging.
:param argparse.Namespace args: args as parsed by parser
'''
verbose = namespace.verbose - namespace.quiet
if verbose >= 2:
qubes.log.enable_debug()
elif verbose >= 1:
qubes.log.enable()
def get_parser_for_command(command):
'''Get parser for given qvm-tool.
:param str command: command name
:rtype: argparse.ArgumentParser
:raises ImportError: when command's module is not found
:raises AttributeError: when parser was not found
'''
module = importlib.import_module(
'.' + command.replace('-', '_'), 'qubes.tools')
try:
parser = module.parser
except AttributeError:
try:
parser = module.get_parser()
except AttributeError:
raise AttributeError('cannot find parser in module')
return parser