820539e909
Always define those properties, always include them in volume config. Also simplify overriding pool based on volume type defined by those: override pool unless snap_on_start=True. QubesOS/qubes-issues#2256
789 lines
26 KiB
Python
789 lines
26 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) 2013-2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2013-2015 Marek Marczykowski-Górecki
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# <marmarek@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 storage system"""
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from __future__ import absolute_import
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import inspect
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import os
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import os.path
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import string # pylint: disable=deprecated-module
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import time
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from datetime import datetime
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import asyncio
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import lxml.etree
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import pkg_resources
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import qubes
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import qubes.exc
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import qubes.utils
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STORAGE_ENTRY_POINT = 'qubes.storage'
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class StoragePoolException(qubes.exc.QubesException):
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''' A general storage exception '''
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pass
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class BlockDevice(object):
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''' Represents a storage block device. '''
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# pylint: disable=too-few-public-methods
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def __init__(self, path, name, script=None, rw=True, domain=None,
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devtype='disk'):
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assert name, 'Missing device name'
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assert path, 'Missing device path'
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self.path = path
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self.name = name
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self.rw = rw
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self.script = script
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self.domain = domain
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self.devtype = devtype
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class Volume(object):
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''' Encapsulates all data about a volume for serialization to qubes.xml and
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libvirt config.
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Keep in mind!
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volatile = not snap_on_start and not save_on_stop
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snapshot = snap_on_start and not save_on_stop
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origin = not snap_on_start and save_on_stop
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origin_snapshot = snap_on_start and save_on_stop
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'''
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devtype = 'disk'
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domain = None
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path = None
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script = None
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usage = 0
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def __init__(self, name, pool, vid, internal=False, removable=False,
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revisions_to_keep=0, rw=False, save_on_stop=False, size=0,
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snap_on_start=False, source=None, **kwargs):
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''' Initialize a volume.
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:param str name: The domain name
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:param Pool pool: The pool object
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:param str vid: Volume identifier needs to be unique in pool
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:param bool internal: If `True` volume is hidden when qvm-block ls
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is used
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:param bool removable: If `True` volume can be detached from vm at
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run time
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:param int revisions_to_keep: Amount of revisions to keep around
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:param bool rw: If true volume will be mounted read-write
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:param bool snap_on_start: Create a snapshot from source on start
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:param bool save_on_stop: Write changes to disk in vm.stop()
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:param Volume source: other volume in same pool, or None
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:param str/int size: Size of the volume
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'''
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super(Volume, self).__init__(**kwargs)
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assert isinstance(pool, Pool)
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assert source is None or (isinstance(source, Volume)
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and source.pool == pool)
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self.name = str(name)
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self.pool = pool
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self.internal = internal
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self.removable = removable
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self.revisions_to_keep = int(revisions_to_keep)
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self.rw = rw
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self.save_on_stop = save_on_stop
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self._size = int(size)
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self.snap_on_start = snap_on_start
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self.source = source
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self.vid = vid
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def __eq__(self, other):
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if isinstance(other, Volume):
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return other.pool == self.pool and other.vid == self.vid
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return NotImplemented
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def __hash__(self):
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return hash('%s:%s' % (self.pool, self.vid))
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def __neq__(self, other):
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return not self.__eq__(other)
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def __repr__(self):
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return '{!r}'.format(str(self.pool) + ':' + self.vid)
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def __str__(self):
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return str(self.vid)
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def __xml__(self):
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config = _sanitize_config(self.config)
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return lxml.etree.Element('volume', **config)
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def create(self):
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''' Create the given volume on disk.
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This can be implemented as a coroutine.
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'''
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raise self._not_implemented("create")
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def remove(self):
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''' Remove volume.
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This can be implemented as a coroutine.'''
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raise self._not_implemented("remove")
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def commit(self):
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''' Write the snapshot to disk
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This can be implemented as a coroutine.'''
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raise self._not_implemented("commit")
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def export(self):
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''' Returns an object that can be `open()`. '''
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raise self._not_implemented("export")
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def import_data(self):
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''' Returns an object that can be `open()`. '''
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raise self._not_implemented("import")
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def import_data_end(self, success):
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''' End data import operation. This may be used by pool
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implementation to commit changes, cleanup temporary files etc.
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:param success: True if data import was successful, otherwise False
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'''
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# by default do nothing
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pass
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def import_volume(self, src_volume):
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''' Imports data from a different volume (possibly in a different
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pool.
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The needs to be create()d first.
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This can be implemented as a coroutine. '''
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# pylint: disable=unused-argument
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raise self._not_implemented("import_volume")
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def is_dirty(self):
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''' Return `True` if volume was not properly shutdown and commited '''
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raise self._not_implemented("is_dirty")
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def is_outdated(self):
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''' Returns `True` if the currently used `volume.source` of a snapshot
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volume is outdated.
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'''
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raise self._not_implemented("is_outdated")
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def recover(self):
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''' Try to recover a :py:class:`Volume` or :py:class:`SnapVolume` '''
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raise self._not_implemented("recover")
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def reset(self):
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''' Drop and recreate volume without copying it's content from source.
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'''
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raise self._not_implemented("reset")
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def resize(self, size):
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''' Expands volume, throws
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:py:class:`qubes.storage.StoragePoolException` if
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given size is less than current_size
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This can be implemented as a coroutine.
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'''
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# pylint: disable=unused-argument
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raise self._not_implemented("resize")
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def revert(self, revision=None):
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''' Revert volume to previous revision '''
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# pylint: disable=unused-argument
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raise self._not_implemented("revert")
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def start(self):
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''' Do what ever is needed on start
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This can be implemented as a coroutine.'''
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raise self._not_implemented("start")
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def stop(self):
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''' Do what ever is needed on stop
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This can be implemented as a coroutine.'''
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def verify(self):
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''' Verifies the volume.
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This can be implemented as a coroutine.'''
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raise self._not_implemented("verify")
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def block_device(self):
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''' Return :py:class:`BlockDevice` for serialization in
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the libvirt XML template as <disk>.
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'''
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return BlockDevice(self.path, self.name, self.script,
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self.rw, self.domain, self.devtype)
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@property
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def revisions(self):
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''' Returns a `dict` containing revision identifiers and paths '''
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msg = "{!s} has revisions not implemented".format(self.__class__)
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raise NotImplementedError(msg)
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@property
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def size(self):
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return self._size
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@size.setter
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def size(self, size):
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# pylint: disable=attribute-defined-outside-init
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self._size = int(size)
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@property
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def config(self):
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''' return config data for serialization to qubes.xml '''
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result = {
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'name': self.name,
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'pool': str(self.pool),
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'vid': self.vid,
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'internal': self.internal,
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'removable': self.removable,
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'revisions_to_keep': self.revisions_to_keep,
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'rw': self.rw,
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'save_on_stop': self.save_on_stop,
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'snap_on_start': self.snap_on_start,
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}
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if self.size:
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result['size'] = self.size
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if self.source:
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result['source'] = str(self.source)
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return result
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def _not_implemented(self, method_name):
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''' Helper for emitting helpful `NotImplementedError` exceptions '''
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msg = "Volume {!s} has {!s}() not implemented"
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msg = msg.format(str(self.__class__.__name__), method_name)
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return NotImplementedError(msg)
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class Storage(object):
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''' Class for handling VM virtual disks.
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This is base class for all other implementations, mostly with Xen on Linux
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in mind.
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'''
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AVAILABLE_FRONTENDS = set(['xvd' + c for c in string.ascii_lowercase])
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def __init__(self, vm):
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#: Domain for which we manage storage
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self.vm = vm
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self.log = self.vm.log
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#: Additional drive (currently used only by HVM)
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self.drive = None
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if hasattr(vm, 'volume_config'):
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for name, conf in self.vm.volume_config.items():
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if 'source' in conf:
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template = getattr(vm, 'template', None)
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if template:
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# we have no control over VM load order,
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# so initialize storage recursively if needed
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if template.storage is None:
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template.storage = Storage(template)
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# FIXME: this effectively ignore 'source' value;
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# maybe we don't need it at all if it's always from
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# VM's template?
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conf['source'] = template.volumes[name]
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self.init_volume(name, conf)
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def init_volume(self, name, volume_config):
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''' Initialize Volume instance attached to this domain '''
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assert 'pool' in volume_config, "Pool missing in volume_config " + str(
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volume_config)
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if 'name' not in volume_config:
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volume_config['name'] = name
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pool = self.vm.app.get_pool(volume_config['pool'])
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volume = pool.init_volume(self.vm, volume_config)
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self.vm.volumes[name] = volume
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return volume
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def attach(self, volume, rw=False):
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''' Attach a volume to the domain '''
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assert self.vm.is_running()
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if self._is_already_attached(volume):
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self.vm.log.info("{!r} already attached".format(volume))
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return
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try:
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frontend = self.unused_frontend()
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except IndexError:
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raise StoragePoolException("No unused frontend found")
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disk = lxml.etree.Element("disk")
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disk.set('type', 'block')
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disk.set('device', 'disk')
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lxml.etree.SubElement(disk, 'driver').set('name', 'phy')
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lxml.etree.SubElement(disk, 'source').set('dev', '/dev/%s' % volume.vid)
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lxml.etree.SubElement(disk, 'target').set('dev', frontend)
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if not rw:
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lxml.etree.SubElement(disk, 'readonly')
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if volume.domain is not None:
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lxml.etree.SubElement(disk, 'backenddomain').set(
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'name', volume.domain.name)
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xml_string = lxml.etree.tostring(disk, encoding='utf-8')
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self.vm.libvirt_domain.attachDevice(xml_string)
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# trigger watches to update device status
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# FIXME: this should be removed once libvirt will report such
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# events itself
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# self.vm.qdb.write('/qubes-block-devices', '') ← do we need this?
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def _is_already_attached(self, volume):
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''' Checks if the given volume is already attached '''
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parsed_xml = lxml.etree.fromstring(self.vm.libvirt_domain.XMLDesc())
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disk_sources = parsed_xml.xpath("//domain/devices/disk/source")
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for source in disk_sources:
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if source.get('dev') == '/dev/%s' % volume.vid:
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return True
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return False
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def detach(self, volume):
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''' Detach a volume from domain '''
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parsed_xml = lxml.etree.fromstring(self.vm.libvirt_domain.XMLDesc())
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disks = parsed_xml.xpath("//domain/devices/disk")
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for disk in disks:
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source = disk.xpath('source')[0]
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if source.get('dev') == '/dev/%s' % volume.vid:
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disk_xml = lxml.etree.tostring(disk, encoding='utf-8')
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self.vm.libvirt_domain.detachDevice(disk_xml)
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return
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raise StoragePoolException('Volume {!r} is not attached'.format(volume))
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|
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@property
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def kernels_dir(self):
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'''Directory where kernel resides.
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If :py:attr:`self.vm.kernel` is :py:obj:`None`, the this points inside
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:py:attr:`self.vm.dir_path`
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'''
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assert 'kernel' in self.vm.volumes, "VM has no kernel volume"
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return self.vm.volumes['kernel'].kernels_dir
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|
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def get_disk_utilization(self):
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''' Returns summed up disk utilization for all domain volumes '''
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result = 0
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for volume in self.vm.volumes.values():
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result += volume.usage
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return result
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|
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@asyncio.coroutine
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def resize(self, volume, size):
|
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''' Resizes volume a read-writable volume '''
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if isinstance(volume, str):
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volume = self.vm.volumes[volume]
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ret = volume.resize(size)
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if asyncio.iscoroutine(ret):
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yield from ret
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if self.vm.is_running():
|
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yield from self.vm.run_service_for_stdio('qubes.ResizeDisk',
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input=volume.name.encode(),
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user='root')
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|
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@asyncio.coroutine
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def create(self):
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''' Creates volumes on disk '''
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old_umask = os.umask(0o002)
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coros = []
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for volume in self.vm.volumes.values():
|
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# launch the operation, if it's asynchronous, then append to wait
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# for them at the end
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ret = volume.create()
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if asyncio.iscoroutine(ret):
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coros.append(ret)
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if coros:
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yield from asyncio.wait(coros)
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os.umask(old_umask)
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|
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@asyncio.coroutine
|
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def clone_volume(self, src_vm, name):
|
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''' Clone single volume from the specified vm
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|
|
|
:param QubesVM src_vm: source VM
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:param str name: name of volume to clone ('root', 'private' etc)
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:return cloned volume object
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'''
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config = self.vm.volume_config[name]
|
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dst_pool = self.vm.app.get_pool(config['pool'])
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dst = dst_pool.init_volume(self.vm, config)
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src_volume = src_vm.volumes[name]
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msg = "Importing volume {!s} from vm {!s}"
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self.vm.log.info(msg.format(src_volume.name, src_vm.name))
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clone_op_ret = dst.import_volume(src_volume)
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|
|
# clone/import functions may be either synchronous or asynchronous
|
|
# in the later case, we need to wait for them to finish
|
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if asyncio.iscoroutine(clone_op_ret):
|
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clone_op_ret = yield from clone_op_ret
|
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self.vm.volumes[name] = clone_op_ret
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return self.vm.volumes[name]
|
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|
|
@asyncio.coroutine
|
|
def clone(self, src_vm):
|
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''' Clone volumes from the specified vm '''
|
|
|
|
self.vm.volumes = {}
|
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with VmCreationManager(self.vm):
|
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yield from asyncio.wait(self.clone_volume(src_vm, vol_name)
|
|
for vol_name in self.vm.volume_config.keys())
|
|
|
|
@property
|
|
def outdated_volumes(self):
|
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''' Returns a list of outdated volumes '''
|
|
result = []
|
|
if self.vm.is_halted():
|
|
return result
|
|
|
|
volumes = self.vm.volumes
|
|
for volume in volumes.values():
|
|
if volume.is_outdated():
|
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result += [volume]
|
|
|
|
return result
|
|
|
|
@asyncio.coroutine
|
|
def verify(self):
|
|
'''Verify that the storage is sane.
|
|
|
|
On success, returns normally. On failure, raises exception.
|
|
'''
|
|
if not os.path.exists(self.vm.dir_path):
|
|
raise qubes.exc.QubesVMError(
|
|
self.vm,
|
|
'VM directory does not exist: {}'.format(self.vm.dir_path))
|
|
futures = []
|
|
for volume in self.vm.volumes.values():
|
|
ret = volume.verify()
|
|
if asyncio.iscoroutine(ret):
|
|
futures.append(ret)
|
|
if futures:
|
|
yield from asyncio.wait(futures)
|
|
self.vm.fire_event('domain-verify-files')
|
|
return True
|
|
|
|
@asyncio.coroutine
|
|
def remove(self):
|
|
''' Remove all the volumes.
|
|
|
|
Errors on removal are catched and logged.
|
|
'''
|
|
futures = []
|
|
for name, volume in self.vm.volumes.items():
|
|
self.log.info('Removing volume %s: %s' % (name, volume.vid))
|
|
try:
|
|
ret = volume.remove()
|
|
if asyncio.iscoroutine(ret):
|
|
futures.append(ret)
|
|
except (IOError, OSError) as e:
|
|
self.vm.log.exception("Failed to remove volume %s", name, e)
|
|
|
|
if futures:
|
|
try:
|
|
yield from asyncio.wait(futures)
|
|
except (IOError, OSError) as e:
|
|
self.vm.log.exception("Failed to remove some volume", e)
|
|
|
|
@asyncio.coroutine
|
|
def start(self):
|
|
''' Execute the start method on each pool '''
|
|
futures = []
|
|
for volume in self.vm.volumes.values():
|
|
ret = volume.start()
|
|
if asyncio.iscoroutine(ret):
|
|
futures.append(ret)
|
|
|
|
if futures:
|
|
yield from asyncio.wait(futures)
|
|
|
|
@asyncio.coroutine
|
|
def stop(self):
|
|
''' Execute the start method on each pool '''
|
|
futures = []
|
|
for volume in self.vm.volumes.values():
|
|
ret = volume.stop()
|
|
if asyncio.iscoroutine(ret):
|
|
futures.append(ret)
|
|
|
|
if futures:
|
|
yield from asyncio.wait(futures)
|
|
|
|
@asyncio.coroutine
|
|
def commit(self):
|
|
''' Makes changes to an 'origin' volume persistent '''
|
|
futures = []
|
|
for volume in self.vm.volumes.values():
|
|
if volume.save_on_stop:
|
|
ret = volume.commit()
|
|
if asyncio.iscoroutine(ret):
|
|
futures.append(ret)
|
|
|
|
if futures:
|
|
yield asyncio.wait(futures)
|
|
|
|
def unused_frontend(self):
|
|
''' Find an unused device name '''
|
|
unused_frontends = self.AVAILABLE_FRONTENDS.difference(
|
|
self.used_frontends)
|
|
return sorted(unused_frontends)[0]
|
|
|
|
@property
|
|
def used_frontends(self):
|
|
''' Used device names '''
|
|
xml = self.vm.libvirt_domain.XMLDesc()
|
|
parsed_xml = lxml.etree.fromstring(xml)
|
|
return set([target.get('dev', None)
|
|
for target in parsed_xml.xpath(
|
|
"//domain/devices/disk/target")])
|
|
|
|
def export(self, volume):
|
|
''' Helper function to export volume (pool.export(volume))'''
|
|
assert isinstance(volume, (Volume, str)), \
|
|
"You need to pass a Volume or pool name as str"
|
|
if isinstance(volume, Volume):
|
|
return volume.export()
|
|
|
|
return self.vm.volumes[volume].export()
|
|
|
|
def import_data(self, volume):
|
|
''' Helper function to import volume data (pool.import_data(volume))'''
|
|
assert isinstance(volume, (Volume, str)), \
|
|
"You need to pass a Volume or pool name as str"
|
|
if isinstance(volume, Volume):
|
|
return volume.import_data()
|
|
|
|
return self.vm.volumes[volume].import_data()
|
|
|
|
def import_data_end(self, volume, success):
|
|
''' Helper function to finish/cleanup data import
|
|
(pool.import_data_end( volume))'''
|
|
assert isinstance(volume, (Volume, str)), \
|
|
"You need to pass a Volume or pool name as str"
|
|
if isinstance(volume, Volume):
|
|
return volume.import_data_end(volume,
|
|
success=success)
|
|
|
|
return self.vm.volumes[volume].import_data_end(success=success)
|
|
|
|
|
|
class VolumesCollection(object):
|
|
'''Convenient collection wrapper for pool.get_volume and
|
|
pool.list_volumes
|
|
'''
|
|
def __init__(self, pool):
|
|
self._pool = pool
|
|
|
|
def __getitem__(self, item):
|
|
''' Get a single volume with given Volume ID.
|
|
|
|
You can also a Volume instance to get the same Volume or KeyError if
|
|
Volume no longer exists.
|
|
|
|
:param item: a Volume ID (str) or a Volume instance
|
|
'''
|
|
if isinstance(item, Volume):
|
|
if item.pool == self._pool:
|
|
return self[item.vid]
|
|
else:
|
|
raise KeyError(item)
|
|
try:
|
|
return self._pool.get_volume(item)
|
|
except NotImplementedError:
|
|
for vol in self:
|
|
if vol.vid == item:
|
|
return vol
|
|
# if list_volumes is not implemented too, it will raise
|
|
# NotImplementedError again earlier
|
|
raise KeyError(item)
|
|
|
|
def __iter__(self):
|
|
''' Get iterator over pool's volumes '''
|
|
return iter(self._pool.list_volumes())
|
|
|
|
def __contains__(self, item):
|
|
''' Check if given volume (either Volume ID or Volume instance) is
|
|
present in the pool
|
|
'''
|
|
try:
|
|
return self[item] is not None
|
|
except KeyError:
|
|
return False
|
|
|
|
def keys(self):
|
|
''' Return list of volume IDs '''
|
|
return [vol.vid for vol in self]
|
|
|
|
def values(self):
|
|
''' Return list of Volumes'''
|
|
return [vol for vol in self]
|
|
|
|
|
|
class Pool(object):
|
|
''' A Pool is used to manage different kind of volumes (File
|
|
based/LVM/Btrfs/...).
|
|
|
|
3rd Parties providing own storage implementations will need to extend
|
|
this class.
|
|
''' # pylint: disable=unused-argument
|
|
private_img_size = qubes.config.defaults['private_img_size']
|
|
root_img_size = qubes.config.defaults['root_img_size']
|
|
|
|
def __init__(self, name, revisions_to_keep=1, **kwargs):
|
|
super(Pool, self).__init__(**kwargs)
|
|
self._volumes_collection = VolumesCollection(self)
|
|
self.name = name
|
|
self.revisions_to_keep = revisions_to_keep
|
|
kwargs['name'] = self.name
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, Pool):
|
|
return self.name == other.name
|
|
elif isinstance(other, str):
|
|
return self.name == other
|
|
return NotImplemented
|
|
|
|
def __neq__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
def __str__(self):
|
|
return self.name
|
|
|
|
def __hash__(self):
|
|
return hash(self.name)
|
|
|
|
def __xml__(self):
|
|
config = _sanitize_config(self.config)
|
|
return lxml.etree.Element('pool', **config)
|
|
|
|
@property
|
|
def config(self):
|
|
''' Returns the pool config to be written to qubes.xml '''
|
|
raise self._not_implemented("config")
|
|
|
|
def destroy(self):
|
|
''' Called when removing the pool. Use this for implementation specific
|
|
clean up.
|
|
'''
|
|
raise self._not_implemented("destroy")
|
|
|
|
def init_volume(self, vm, volume_config):
|
|
''' Initialize a :py:class:`qubes.storage.Volume` from `volume_config`.
|
|
'''
|
|
raise self._not_implemented("init_volume")
|
|
|
|
def setup(self):
|
|
''' Called when adding a pool to the system. Use this for implementation
|
|
specific set up.
|
|
'''
|
|
raise self._not_implemented("setup")
|
|
|
|
@property
|
|
def volumes(self):
|
|
''' Return a collection of volumes managed by this pool '''
|
|
return self._volumes_collection
|
|
|
|
def list_volumes(self):
|
|
''' Return a list of volumes managed by this pool '''
|
|
raise self._not_implemented("list_volumes")
|
|
|
|
def get_volume(self, vid):
|
|
''' Return a volume with *vid* from this pool
|
|
|
|
:raise KeyError: if no volume is found
|
|
'''
|
|
raise self._not_implemented("get_volume")
|
|
|
|
def _not_implemented(self, method_name):
|
|
''' Helper for emitting helpful `NotImplementedError` exceptions '''
|
|
msg = "Pool driver {!s} has {!s}() not implemented"
|
|
msg = msg.format(str(self.__class__.__name__), method_name)
|
|
return NotImplementedError(msg)
|
|
|
|
|
|
def _sanitize_config(config):
|
|
''' Helper function to convert types to appropriate strings
|
|
''' # FIXME: find another solution for serializing basic types
|
|
result = {}
|
|
for key, value in config.items():
|
|
if isinstance(value, bool):
|
|
if value:
|
|
result[key] = 'True'
|
|
else:
|
|
result[key] = str(value)
|
|
return result
|
|
|
|
|
|
def pool_drivers():
|
|
""" Return a list of EntryPoints names """
|
|
return [ep.name
|
|
for ep in pkg_resources.iter_entry_points(STORAGE_ENTRY_POINT)]
|
|
|
|
|
|
def driver_parameters(name):
|
|
''' Get __init__ parameters from a driver with out `self` & `name`. '''
|
|
init_function = qubes.utils.get_entry_point_one(
|
|
qubes.storage.STORAGE_ENTRY_POINT, name).__init__
|
|
params = init_function.func_code.co_varnames
|
|
ignored_params = ['self', 'name']
|
|
return [p for p in params if p not in ignored_params]
|
|
|
|
|
|
def isodate(seconds=time.time()):
|
|
''' Helper method which returns an iso date '''
|
|
return datetime.utcfromtimestamp(seconds).isoformat("T")
|
|
|
|
|
|
class VmCreationManager(object):
|
|
''' A `ContextManager` which cleans up if volume creation fails.
|
|
''' # pylint: disable=too-few-public-methods
|
|
def __init__(self, vm):
|
|
self.vm = vm
|
|
|
|
def __enter__(self):
|
|
pass
|
|
|
|
def __exit__(self, type, value, tb): # pylint: disable=redefined-builtin
|
|
if type is not None and value is not None and tb is not None:
|
|
for volume in self.vm.volumes.values():
|
|
try:
|
|
volume.remove()
|
|
except Exception: # pylint: disable=broad-except
|
|
pass
|
|
os.rmdir(self.vm.dir_path)
|