401 lines
14 KiB
Python
401 lines
14 KiB
Python
#!/usr/bin/python2 -O
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# vim: fileencoding=utf-8
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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) 2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2015 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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'''Qubes' command line tools
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'''
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from __future__ import print_function
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import argparse
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import importlib
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import logging
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import os
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import sys
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import textwrap
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import qubes.log
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#: constant returned when some action should be performed on all qubes
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VM_ALL = object()
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class QubesAction(argparse.Action):
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''' Interface providing a convinience method to be called, after
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`namespace.app` is instantiated.
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'''
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# pylint: disable=too-few-public-methods
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def parse_qubes_app(self, parser, namespace):
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''' This method is called by :py:class:`qubes.tools.QubesArgumentParser`
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after the `namespace.app` is instantiated. Oerwrite this method when
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extending :py:class:`qubes.tools.QubesAction` to initialized values
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based on the `namespace.app`
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'''
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raise NotImplementedError
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class PropertyAction(argparse.Action):
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'''Action for argument parser that stores a property.'''
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# pylint: disable=redefined-builtin,too-few-public-methods
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def __init__(self,
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option_strings,
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dest,
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metavar='NAME=VALUE',
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required=False,
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help='set property to a value'):
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super(PropertyAction, self).__init__(option_strings, 'properties',
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metavar=metavar, default={}, help=help)
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def __call__(self, parser, namespace, values, option_string=None):
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try:
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prop, value = values.split('=', 1)
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except ValueError:
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parser.error('invalid property token: {!r}'.format(values))
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getattr(namespace, self.dest)[prop] = value
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class SinglePropertyAction(argparse.Action):
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'''Action for argument parser that stores a property.'''
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# pylint: disable=redefined-builtin,too-few-public-methods
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def __init__(self,
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option_strings,
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dest,
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metavar='VALUE',
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const=None,
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nargs=None,
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required=False,
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help=None):
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if help is None:
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help = 'set {!r} property to a value'.format(dest)
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if const is not None:
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help += ' {!r}'.format(const)
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if const is not None:
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nargs = 0
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super(SinglePropertyAction, self).__init__(option_strings, 'properties',
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metavar=metavar, help=help, default={}, const=const,
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nargs=nargs)
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self.name = dest
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def __call__(self, parser, namespace, values, option_string=None):
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getattr(namespace, self.dest)[self.name] = values \
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if self.const is None else self.const
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class HelpPropertiesAction(argparse.Action):
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'''Action for argument parser that displays all properties and exits.'''
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# pylint: disable=redefined-builtin,too-few-public-methods
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def __init__(self,
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option_strings,
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klass=None,
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dest=argparse.SUPPRESS,
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default=argparse.SUPPRESS,
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help='list all available properties with short descriptions'
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' and exit'):
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super(HelpPropertiesAction, self).__init__(
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option_strings=option_strings,
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dest=dest,
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default=default,
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nargs=0,
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help=help)
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# late import because of circular dependency
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import qubes # pylint: disable=redefined-outer-name
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self._klass = klass if klass is not None else qubes.Qubes
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def __call__(self, parser, namespace, values, option_string=None):
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# pylint: disable=redefined-outer-name
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properties = self._klass.property_list()
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width = max(len(prop.__name__) for prop in properties)
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wrapper = textwrap.TextWrapper(width=80,
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initial_indent=' ', subsequent_indent=' ' * (width + 6))
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text = 'Common properties:\n' + '\n'.join(
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wrapper.fill('{name:{width}s} {doc}'.format(
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name=prop.__name__,
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doc=qubes.utils.format_doc(prop.__doc__) if prop.__doc__ else'',
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width=width))
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for prop in sorted(properties))
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if self._klass is not qubes.Qubes:
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text += '\n\n' \
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'There may be more properties in specific domain classes.\n'
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parser.exit(message=text)
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class VmNameAction(QubesAction):
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''' Action for parsing one ore multiple domains from provided VMNAMEs '''
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# pylint: disable=too-few-public-methods,redefined-builtin
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def __init__(self, option_strings, nargs=1, dest='vmnames', help=None,
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**kwargs):
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if help is None:
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if nargs == argparse.OPTIONAL:
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help = 'at most one domain name'
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elif nargs == 1:
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help = 'a domain name'
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elif nargs == argparse.ZERO_OR_MORE:
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help = 'zero or more domain names'
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elif nargs == argparse.ONE_OR_MORE:
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help = 'one or more domain names'
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elif nargs > 1:
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help = '%s domain names' % nargs
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else:
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raise argparse.ArgumentError(
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nargs, "Passed unexpected value {!s} as {!s} nargs ".format(
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nargs, dest))
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super(VmNameAction, self).__init__(option_strings, dest=dest, help=help,
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nargs=nargs, **kwargs)
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def __call__(self, parser, namespace, values, option_string=None):
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''' Set ``namespace.vmname`` 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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assert hasattr(namespace, 'app')
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setattr(namespace, 'domains', [])
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app = namespace.app
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if hasattr(namespace, 'all_domains') and namespace.all_domains:
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namespace.domains = [
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vm
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for vm in app.domains
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if vm.qid != 0 and vm.name not in namespace.exclude
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]
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else:
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if hasattr(namespace, 'exclude') and namespace.exclude:
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parser.error('--exclude can only be used with --all')
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for vm_name in getattr(namespace, self.dest):
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try:
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namespace.domains += [app.domains[vm_name]]
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except KeyError:
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parser.error('no such domain: {!r}'.format(vm_name))
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class QubesArgumentParser(argparse.ArgumentParser):
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'''Parser preconfigured for use in most of the Qubes command-line tools.
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:param bool want_app: instantiate :py:class:`qubes.Qubes` object
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:param bool want_app_no_instance: don't actually instantiate \
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:py:class:`qubes.Qubes` object, just add argument for custom xml file
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:param bool want_force_root: add ``--force-root`` option
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:param mixed vmname_nargs: The number of ``VMNAME`` arguments that should be
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consumed. Values include:
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- N (an integer) consumes N arguments (and produces a list)
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- '?' consumes zero or one arguments
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- '*' consumes zero or more arguments (and produces a list)
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- '+' consumes one or more arguments (and produces a list)
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*kwargs* are passed to :py:class:`argparser.ArgumentParser`.
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Currenty supported options:
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``--force-root`` (optional)
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``--qubesxml`` location of :file:`qubes.xml` (help is suppressed)
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``--verbose`` and ``--quiet``
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'''
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def __init__(self, want_app=True, want_app_no_instance=False,
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want_force_root=False, vmname_nargs=None, **kwargs):
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super(QubesArgumentParser, self).__init__(**kwargs)
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self._want_app = want_app
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self._want_app_no_instance = want_app_no_instance
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self._want_force_root = want_force_root
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self._vmname_nargs = vmname_nargs
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if self._want_app:
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self.add_argument('--qubesxml', metavar='FILE', action='store',
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dest='app', help=argparse.SUPPRESS)
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self.add_argument('--verbose', '-v', action='count',
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help='increase verbosity')
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self.add_argument('--quiet', '-q', action='count',
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help='decrease verbosity')
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if self._want_force_root:
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self.add_argument('--force-root', action='store_true',
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default=False, help='force to run as root')
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if self._vmname_nargs in [argparse.ZERO_OR_MORE, argparse.ONE_OR_MORE]:
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vm_name_group = VmNameGroup(self, self._vmname_nargs)
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self._mutually_exclusive_groups.append(vm_name_group)
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elif self._vmname_nargs is not None:
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self.add_argument('VMNAME', nargs=self._vmname_nargs,
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action=VmNameAction)
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self.set_defaults(verbose=1, quiet=0)
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def parse_args(self, *args, **kwargs):
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namespace = super(QubesArgumentParser, self).parse_args(*args, **kwargs)
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if self._want_app and not self._want_app_no_instance:
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self.set_qubes_verbosity(namespace)
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namespace.app = qubes.Qubes(namespace.app)
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if self._want_force_root:
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self.dont_run_as_root(namespace)
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for action in self._actions:
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if issubclass(action.__class__, QubesAction):
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action.parse_qubes_app(self, namespace)
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return namespace
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def error_runtime(self, message):
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'''Runtime error, without showing usage.
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:param str message: message to show
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'''
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self.exit(1, '{}: error: {}\n'.format(self.prog, message))
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def dont_run_as_root(self, namespace):
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'''Prevent running as root.
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:param argparse.Namespace args: if there is ``.force_root`` attribute \
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set to true, run anyway
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'''
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try:
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euid = os.geteuid()
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except AttributeError: # no geteuid(), probably NT
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return
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if euid == 0 and not namespace.force_root:
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self.error_runtime(
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'refusing to run as root; add --force-root to override')
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@staticmethod
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def get_loglevel_from_verbosity(namespace):
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''' Return loglevel calculated from quiet and verbose arguments '''
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return (namespace.quiet - namespace.verbose) * 10 + logging.WARNING
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@staticmethod
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def set_qubes_verbosity(namespace):
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'''Apply a verbosity setting.
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This is done by configuring global logging.
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:param argparse.Namespace args: args as parsed by parser
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'''
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verbose = namespace.verbose - namespace.quiet
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if verbose >= 2:
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qubes.log.enable_debug()
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elif verbose >= 1:
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qubes.log.enable()
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# pylint: disable=no-self-use
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def print_error(self, *args, **kwargs):
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''' Print to ``sys.stderr``'''
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print(*args, file=sys.stderr, **kwargs)
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class AliasedSubParsersAction(argparse._SubParsersAction):
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# source https://gist.github.com/sampsyo/471779
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# pylint: disable=protected-access,too-few-public-methods
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class _AliasedPseudoAction(argparse.Action):
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# pylint: disable=redefined-builtin
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def __init__(self, name, aliases, help):
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dest = name
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if aliases:
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dest += ' (%s)' % ','.join(aliases)
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sup = super(AliasedSubParsersAction._AliasedPseudoAction, self)
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sup.__init__(option_strings=[], dest=dest, help=help)
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def __call__(self, **kwargs):
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super(AliasedSubParsersAction._AliasedPseudoAction, self).__call__(
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**kwargs)
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def add_parser(self, name, **kwargs):
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if 'aliases' in kwargs:
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aliases = kwargs['aliases']
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del kwargs['aliases']
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else:
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aliases = []
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local_parser = super(AliasedSubParsersAction, self).add_parser(
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name, **kwargs)
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# Make the aliases work.
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for alias in aliases:
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self._name_parser_map[alias] = local_parser
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# Make the help text reflect them, first removing old help entry.
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if 'help' in kwargs:
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self._choices_actions.pop()
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pseudo_action = self._AliasedPseudoAction(name, aliases,
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kwargs.pop('help'))
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self._choices_actions.append(pseudo_action)
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return local_parser
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def get_parser_for_command(command):
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'''Get parser for given qvm-tool.
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:param str command: command name
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:rtype: argparse.ArgumentParser
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:raises ImportError: when command's module is not found
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:raises AttributeError: when parser was not found
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'''
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module = importlib.import_module(
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'.' + command.replace('-', '_'), 'qubes.tools')
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try:
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parser = module.parser
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except AttributeError:
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try:
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parser = module.get_parser()
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except AttributeError:
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raise AttributeError('cannot find parser in module')
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return parser
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# pylint: disable=protected-access
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class VmNameGroup(argparse._MutuallyExclusiveGroup):
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''' Adds an a VMNAME, --all & --exclude parameters to a
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:py:class:``argparse.ArgumentParser```.
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'''
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def __init__(self, container, required, vm_action=VmNameAction):
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super(VmNameGroup, self).__init__(container, required=required)
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self.add_argument('--all', action='store_true',
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dest='all_domains',
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help='perform the action on all qubes')
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container.add_argument('--exclude', action='append', default=[],
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help='exclude the qube from --all')
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self.add_argument('VMNAME', action=vm_action, nargs='*',
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default=[]) # the default parameter is important! see
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# https://stackoverflow.com/questions/35044288
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# and `argparse.ArgumentParser.parse_args()`
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