038ca6d5d7
Allow to get default value even it isn't set currently. This will allow (G)UI to present better view, without duplicating logic for default value. Fixes QubesOS/qubes-issues#3197
728 lines
24 KiB
Python
728 lines
24 KiB
Python
#
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# The Qubes OS Project, https://www.qubes-os.org/
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#
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# Copyright (C) 2010-2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2011-2015 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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# Copyright (C) 2014-2015 Wojtek Porczyk <woju@invisiblethingslab.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# 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
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# License along with this library; if not, see <https://www.gnu.org/licenses/>.
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#
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'''
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Qubes OS
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:copyright: © 2010-2015 Invisible Things Lab
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'''
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import builtins
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import collections
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import os
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import os.path
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import string
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import lxml.etree
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import qubes.config
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import qubes.events
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import qubes.exc
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__author__ = 'Invisible Things Lab'
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__license__ = 'GPLv2 or later'
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__version__ = 'R3'
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class Label(object):
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'''Label definition for virtual machines
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Label specifies colour of the padlock displayed next to VM's name.
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When this is a :py:class:`qubes.vm.dispvm.DispVM`, padlock is overlayed
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with recycling pictogram.
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:param int index: numeric identificator of label
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:param str color: colour specification as in HTML (``#abcdef``)
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:param str name: label's name like "red" or "green"
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'''
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def __init__(self, index, color, name):
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#: numeric identificator of label
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self.index = index
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#: colour specification as in HTML (``#abcdef``)
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self.color = color
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#: label's name like "red" or "green"
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self.name = name
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#: freedesktop icon name, suitable for use in
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#: :py:meth:`PyQt4.QtGui.QIcon.fromTheme`
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self.icon = 'appvm-' + name
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#: freedesktop icon name, suitable for use in
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#: :py:meth:`PyQt4.QtGui.QIcon.fromTheme` on DispVMs
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self.icon_dispvm = 'dispvm-' + name
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@classmethod
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def fromxml(cls, xml):
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'''Create label definition from XML node
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:param lxml.etree._Element xml: XML node reference
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:rtype: :py:class:`qubes.Label`
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'''
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index = int(xml.get('id').split('-', 1)[1])
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color = xml.get('color')
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name = xml.text
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return cls(index, color, name)
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def __xml__(self):
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element = lxml.etree.Element(
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'label', id='label-{}'.format(self.index), color=self.color)
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element.text = self.name
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return element
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def __str__(self):
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return self.name
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def __repr__(self):
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return '{}({!r}, {!r}, {!r})'.format(
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self.__class__.__name__,
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self.index,
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self.color,
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self.name)
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def __eq__(self, other):
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if isinstance(other, Label):
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return self.name == other.name
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return NotImplemented
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def __hash__(self):
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return hash(self.name)
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@builtins.property
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def icon_path(self):
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'''Icon path
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.. deprecated:: 2.0
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use :py:meth:`PyQt4.QtGui.QIcon.fromTheme` and :py:attr:`icon`
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'''
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return os.path.join(qubes.config.system_path['qubes_icon_dir'],
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self.icon) + ".png"
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@builtins.property
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def icon_path_dispvm(self):
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'''Icon path
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.. deprecated:: 2.0
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use :py:meth:`PyQt4.QtGui.QIcon.fromTheme` and :py:attr:`icon_dispvm`
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'''
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return os.path.join(qubes.config.system_path['qubes_icon_dir'],
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self.icon_dispvm) + ".png"
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class property(object): # pylint: disable=redefined-builtin,invalid-name
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'''Qubes property.
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This class holds one property that can be saved to and loaded from
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:file:`qubes.xml`. It is used for both global and per-VM properties.
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Property can be unset by ordinary ``del`` statement or assigning
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:py:attr:`DEFAULT` special value to it. After deletion (or before first
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assignment/load) attempting to read a property will get its default value
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or, when no default, py:class:`exceptions.AttributeError`.
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:param str name: name of the property
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:param collections.Callable setter: if not :py:obj:`None`, this is used to \
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initialise value; first parameter to the function is holder instance \
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and the second is value; this is called before ``type``
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:param collections.Callable saver: function to coerce value to something \
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readable by setter
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:param type type: if not :py:obj:`None`, value is coerced to this type
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:param object default: default value; if callable, will be called with \
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holder as first argument
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:param int load_stage: stage when property should be loaded (see \
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:py:class:`Qubes` for description of stages)
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:param int order: order of evaluation (bigger order values are later)
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:param bool clone: :py:meth:`PropertyHolder.clone_properties` will not \
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include this property by default if :py:obj:`False`
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:param str doc: docstring; this should be one paragraph of plain RST, no \
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sphinx-specific features
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Setters and savers have following signatures:
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.. :py:function:: setter(self, prop, value)
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:noindex:
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:param self: instance of object that is holding property
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:param prop: property object
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:param value: value being assigned
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.. :py:function:: saver(self, prop, value)
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:noindex:
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:param self: instance of object that is holding property
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:param prop: property object
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:param value: value being saved
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:rtype: str
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:raises property.DontSave: when property should not be saved at all
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'''
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#: Assigning this value to property means setting it to its default value.
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#: If property has no default value, this will unset it.
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DEFAULT = object()
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# internal use only
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_NO_DEFAULT = object()
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def __init__(self, name, setter=None, saver=None, type=None,
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default=_NO_DEFAULT, write_once=False, load_stage=2, order=0,
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save_via_ref=False, clone=True,
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doc=None):
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# pylint: disable=redefined-builtin
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self.__name__ = name
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self._setter = setter
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self._saver = saver if saver is not None else (
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lambda self, prop, value: str(value))
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self.type = type
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self._default = default
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self._write_once = write_once
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self.order = order
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self.load_stage = load_stage
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self.save_via_ref = save_via_ref
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self.clone = clone
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self.__doc__ = doc
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self._attr_name = '_qubesprop_' + name
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def __get__(self, instance, owner):
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if instance is None:
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return self
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# XXX this violates duck typing, shall we keep it?
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if not isinstance(instance, PropertyHolder):
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raise AttributeError('qubes.property should be used on '
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'qubes.PropertyHolder instances only')
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try:
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return getattr(instance, self._attr_name)
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except AttributeError:
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return self.get_default(instance)
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def get_default(self, instance):
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if self._default is self._NO_DEFAULT:
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raise AttributeError(
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'property {!r} have no default'.format(self.__name__))
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elif isinstance(self._default, collections.Callable):
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return self._default(instance)
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else:
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return self._default
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def __set__(self, instance, value):
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self._enforce_write_once(instance)
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if value is self.__class__.DEFAULT:
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self.__delete__(instance)
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return
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try:
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oldvalue = getattr(instance, self.__name__)
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has_oldvalue = True
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except AttributeError:
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has_oldvalue = False
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if self._setter is not None:
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value = self._setter(instance, self, value)
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if self.type not in (None, type(value)):
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value = self.type(value)
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if has_oldvalue:
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instance.fire_event('property-pre-set:' + self.__name__,
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pre_event=True,
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name=self.__name__, newvalue=value, oldvalue=oldvalue)
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else:
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instance.fire_event('property-pre-set:' + self.__name__,
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pre_event=True,
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name=self.__name__, newvalue=value)
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instance._property_init(self, value) # pylint: disable=protected-access
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if has_oldvalue:
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instance.fire_event('property-set:' + self.__name__,
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name=self.__name__, newvalue=value, oldvalue=oldvalue)
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else:
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instance.fire_event('property-set:' + self.__name__,
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name=self.__name__, newvalue=value)
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def __delete__(self, instance):
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self._enforce_write_once(instance)
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try:
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oldvalue = getattr(instance, self._attr_name)
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has_oldvalue = True
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except AttributeError:
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has_oldvalue = False
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if has_oldvalue:
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instance.fire_event('property-pre-del:' + self.__name__,
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pre_event=True,
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name=self.__name__, oldvalue=oldvalue)
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delattr(instance, self._attr_name)
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instance.fire_event('property-del:' + self.__name__,
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name=self.__name__, oldvalue=oldvalue)
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else:
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instance.fire_event('property-pre-del:' + self.__name__,
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pre_event=True,
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name=self.__name__)
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instance.fire_event('property-del:' + self.__name__,
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name=self.__name__)
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def __repr__(self):
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default = ' default={!r}'.format(self._default) \
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if self._default is not self._NO_DEFAULT \
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else ''
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return '<{} object at {:#x} name={!r}{}>'.format(
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self.__class__.__name__, id(self), self.__name__, default)
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def __str__(self):
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return self.__name__
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def __hash__(self):
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return hash(self.__name__)
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def __lt__(self, other):
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if isinstance(other, property):
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return (self.load_stage, self.order, self.__name__) <\
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(other.load_stage, other.order, other.__name__)
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return NotImplemented
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def __eq__(self, other):
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if isinstance(other, str):
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return self.__name__ == other
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return isinstance(other, property) and self.__name__ == other.__name__
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def _enforce_write_once(self, instance):
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if self._write_once and not instance.property_is_default(self):
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raise AttributeError(
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'property {!r} is write-once and already set'.format(
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self.__name__))
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def sanitize(self, *, untrusted_newvalue):
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'''Coarse sanitization of value to be set, before sending it to a
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setter. Can raise QubesValueError if the value is invalid.
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:param untrusted_newvalue: value to be validated
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:return: sanitized value
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:raises: qubes.exc.QubesValueError
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'''
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# do not treat type='str' as sufficient validation
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if self.type is not None and self.type is not str:
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# assume specific type will preform enough validation
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try:
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untrusted_newvalue = untrusted_newvalue.decode('ascii',
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errors='strict')
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except UnicodeDecodeError:
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raise qubes.exc.QubesValueError
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if self.type is bool:
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return self.bool(None, None, untrusted_newvalue)
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else:
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try:
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return self.type(untrusted_newvalue)
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except ValueError:
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raise qubes.exc.QubesValueError
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else:
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# 'str' or not specified type
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try:
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untrusted_newvalue = untrusted_newvalue.decode('ascii',
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errors='strict')
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except UnicodeDecodeError:
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raise qubes.exc.QubesValueError
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allowed_set = string.printable
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if not all(x in allowed_set for x in untrusted_newvalue):
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raise qubes.exc.QubesValueError(
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'Invalid characters in property value')
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return untrusted_newvalue
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#
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# exceptions
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#
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class DontSave(Exception):
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'''This exception may be raised from saver to sign that property should
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not be saved.
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'''
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pass
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@staticmethod
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def dontsave(self, prop, value):
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'''Dummy saver that never saves anything.'''
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# pylint: disable=bad-staticmethod-argument,unused-argument
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raise property.DontSave()
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#
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# some setters provided
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#
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@staticmethod
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def forbidden(self, prop, value):
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'''Property setter that forbids loading a property.
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This is used to effectively disable property in classes which inherit
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unwanted property. When someone attempts to load such a property, it
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:throws AttributeError: always
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''' # pylint: disable=bad-staticmethod-argument,unused-argument
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raise AttributeError(
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'setting {} property on {} instance is forbidden'.format(
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prop.__name__, self.__class__.__name__))
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@staticmethod
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def bool(self, prop, value):
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'''Property setter for boolean properties.
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It accepts (case-insensitive) ``'0'``, ``'no'`` and ``false`` as
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:py:obj:`False` and ``'1'``, ``'yes'`` and ``'true'`` as
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:py:obj:`True`.
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''' # pylint: disable=bad-staticmethod-argument,unused-argument
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if isinstance(value, str):
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lcvalue = value.lower()
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if lcvalue in ('0', 'no', 'false', 'off'):
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return False
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if lcvalue in ('1', 'yes', 'true', 'on'):
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return True
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raise qubes.exc.QubesValueError(
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'Invalid literal for boolean property: {!r}'.format(value))
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return bool(value)
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def stateless_property(func):
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'''Decorator similar to :py:class:`builtins.property`, but for properties
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exposed through management API (including qvm-prefs etc)'''
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return property(func.__name__,
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setter=property.forbidden,
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saver=property.DontSave,
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default=func,
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doc=func.__doc__)
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class PropertyHolder(qubes.events.Emitter):
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'''Abstract class for holding :py:class:`qubes.property`
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Events fired by instances of this class:
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.. event:: property-load (subject, event)
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Fired once after all properties are loaded from XML. Individual
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``property-set`` events are not fired.
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.. event:: property-set:<propname> \
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(subject, event, name, newvalue[, oldvalue])
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Fired when property changes state. Signature is variable,
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*oldvalue* is present only if there was an old value.
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:param name: Property name
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:param newvalue: New value of the property
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:param oldvalue: Old value of the property
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.. event:: property-pre-set:<propname> \
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(subject, event, name, newvalue[, oldvalue])
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Fired before property changes state. Signature is variable,
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*oldvalue* is present only if there was an old value.
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:param name: Property name
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:param newvalue: New value of the property
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:param oldvalue: Old value of the property
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.. event:: property-del:<propname> \
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(subject, event, name[, oldvalue])
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Fired when property gets deleted (is set to default). Signature is
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variable, *oldvalue* is present only if there was an old value.
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:param name: Property name
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:param oldvalue: Old value of the property
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.. event:: property-pre-del:<propname> \
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(subject, event, name[, oldvalue])
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Fired before property gets deleted (is set to default). Signature
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is variable, *oldvalue* is present only if there was an old value.
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:param name: Property name
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:param oldvalue: Old value of the property
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.. event:: clone-properties (subject, event, src, proplist)
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:param src: object, from which we are cloning
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:param proplist: list of properties
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Members:
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'''
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def __init__(self, xml, **kwargs):
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self.xml = xml
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propvalues = {}
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all_names = set(prop.__name__ for prop in self.property_list())
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for key in list(kwargs):
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if not key in all_names:
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continue
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propvalues[key] = kwargs.pop(key)
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super(PropertyHolder, self).__init__(**kwargs)
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for key, value in propvalues.items():
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setattr(self, key, value)
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if self.xml is not None:
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# check if properties are appropriate
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all_names = set(prop.__name__ for prop in self.property_list())
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for node in self.xml.xpath('./properties/property'):
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name = node.get('name')
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if name not in all_names:
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raise TypeError(
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'property {!r} not applicable to {!r}'.format(
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name, self.__class__.__name__))
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@classmethod
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def property_list(cls, load_stage=None):
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'''List all properties attached to this VM's class
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:param load_stage: Filter by load stage
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:type load_stage: :py:func:`int` or :py:obj:`None`
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'''
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props = set()
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for class_ in cls.__mro__:
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props.update(prop for prop in class_.__dict__.values()
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if isinstance(prop, property))
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if load_stage is not None:
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props = set(prop for prop in props
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if prop.load_stage == load_stage)
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return sorted(props)
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def _property_init(self, prop, value):
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'''Initialise property to a given value, without side effects.
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:param qubes.property prop: property object of particular interest
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:param value: value
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'''
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# pylint: disable=protected-access
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setattr(self, self.property_get_def(prop)._attr_name, value)
|
|
|
|
|
|
def property_is_default(self, prop):
|
|
'''Check whether property is in it's default value.
|
|
|
|
Properties when unset may return some default value, so
|
|
``hasattr(vm, prop.__name__)`` is wrong in some circumstances. This
|
|
method allows for checking if the value returned is in fact it's
|
|
default value.
|
|
|
|
:param qubes.property prop: property object of particular interest
|
|
:rtype: bool
|
|
''' # pylint: disable=protected-access
|
|
|
|
# both property_get_def() and ._attr_name may throw AttributeError,
|
|
# which we don't want to catch
|
|
attrname = self.property_get_def(prop)._attr_name
|
|
return not hasattr(self, attrname)
|
|
|
|
def property_get_default(self, prop):
|
|
'''Get property default value.
|
|
|
|
:param qubes.property or str prop: property object of particular
|
|
interest
|
|
'''
|
|
|
|
return self.property_get_def(prop).get_default(self)
|
|
|
|
|
|
@classmethod
|
|
def property_get_def(cls, prop):
|
|
'''Return property definition object.
|
|
|
|
If prop is already :py:class:`qubes.property` instance, return the same
|
|
object.
|
|
|
|
:param prop: property object or name
|
|
:type prop: qubes.property or str
|
|
:rtype: qubes.property
|
|
'''
|
|
|
|
if isinstance(prop, qubes.property):
|
|
return prop
|
|
|
|
for p in cls.property_list():
|
|
if p.__name__ == prop:
|
|
return p
|
|
|
|
raise AttributeError('No property {!r} found in {!r}'.format(
|
|
prop, cls))
|
|
|
|
|
|
def load_properties(self, load_stage=None):
|
|
'''Load properties from immediate children of XML node.
|
|
|
|
``property-set`` events are not fired for each individual property.
|
|
|
|
:param int load_stage: Stage of loading.
|
|
'''
|
|
|
|
if self.xml is None:
|
|
return
|
|
all_names = set(
|
|
prop.__name__ for prop in self.property_list(load_stage))
|
|
for node in self.xml.xpath('./properties/property'):
|
|
name = node.get('name')
|
|
value = node.get('ref') or node.text
|
|
|
|
if not name in all_names:
|
|
continue
|
|
|
|
setattr(self, name, value)
|
|
|
|
|
|
def xml_properties(self, with_defaults=False):
|
|
'''Iterator that yields XML nodes representing set properties.
|
|
|
|
:param bool with_defaults: If :py:obj:`True`, then it also includes \
|
|
properties which were not set explicite, but have default values \
|
|
filled.
|
|
'''
|
|
|
|
|
|
properties = lxml.etree.Element('properties')
|
|
|
|
for prop in self.property_list():
|
|
# pylint: disable=protected-access
|
|
try:
|
|
value = getattr(
|
|
self, (prop.__name__ if with_defaults else prop._attr_name))
|
|
except AttributeError:
|
|
continue
|
|
|
|
try:
|
|
value = prop._saver(self, prop, value)
|
|
except property.DontSave:
|
|
continue
|
|
|
|
element = lxml.etree.Element('property', name=prop.__name__)
|
|
if prop.save_via_ref:
|
|
element.set('ref', value)
|
|
else:
|
|
element.text = value
|
|
properties.append(element)
|
|
|
|
return properties
|
|
|
|
|
|
# this was clone_attrs
|
|
def clone_properties(self, src, proplist=None):
|
|
'''Clone properties from other object.
|
|
|
|
:param PropertyHolder src: source object
|
|
:param iterable proplist: list of properties \
|
|
(:py:obj:`None` or omit for all properties except those with \
|
|
:py:attr:`property.clone` set to :py:obj:`False`)
|
|
'''
|
|
|
|
if proplist is None:
|
|
proplist = [prop for prop in self.property_list()
|
|
if prop.clone]
|
|
else:
|
|
proplist = [prop for prop in self.property_list()
|
|
if prop.__name__ in proplist or prop in proplist]
|
|
|
|
for prop in proplist:
|
|
try:
|
|
# pylint: disable=protected-access
|
|
self._property_init(prop, getattr(src, prop._attr_name))
|
|
except AttributeError:
|
|
continue
|
|
|
|
self.fire_event('clone-properties', src=src, proplist=proplist)
|
|
|
|
|
|
def property_require(self, prop, allow_none=False, hard=False):
|
|
'''Complain badly when property is not set.
|
|
|
|
:param prop: property name or object
|
|
:type prop: qubes.property or str
|
|
:param bool allow_none: if :py:obj:`True`, don't complain if \
|
|
:py:obj:`None` is found
|
|
:param bool hard: if :py:obj:`True`, raise :py:class:`AssertionError`; \
|
|
if :py:obj:`False`, log warning instead
|
|
'''
|
|
|
|
if isinstance(prop, qubes.property):
|
|
prop = prop.__name__
|
|
|
|
try:
|
|
value = getattr(self, prop)
|
|
if value is None and not allow_none:
|
|
raise AttributeError()
|
|
except AttributeError:
|
|
# pylint: disable=no-member
|
|
msg = 'Required property {!r} not set on {!r}'.format(prop, self)
|
|
if hard:
|
|
raise AssertionError(msg)
|
|
else:
|
|
# pylint: disable=no-member
|
|
self.log.fatal(msg)
|
|
|
|
|
|
def close(self):
|
|
super().close()
|
|
|
|
# Remove all properties -- somewhere in them there are cyclic
|
|
# references. This just removes all the properties, just in case.
|
|
# They are removed directly, bypassing write_once.
|
|
for prop in self.property_list():
|
|
# pylint: disable=protected-access
|
|
try:
|
|
delattr(self, prop._attr_name)
|
|
except AttributeError:
|
|
pass
|
|
|
|
|
|
# pylint: disable=wrong-import-position
|
|
from qubes.vm import VMProperty
|
|
from qubes.app import Qubes
|
|
|
|
__all__ = [
|
|
'Label',
|
|
'PropertyHolder',
|
|
'Qubes',
|
|
'VMProperty',
|
|
'property',
|
|
]
|