661 lines
23 KiB
Python
661 lines
23 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 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 lxml.etree
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import pkg_resources
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import qubes
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import qubes.devices
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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 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 str pool: The pool name
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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 str source: Vid of other volume in same pool
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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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self.name = str(name)
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self.pool = str(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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return other.pool == self.pool and other.vid == self.vid
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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(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 block_device(self):
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''' Return :py:class:`qubes.devices.BlockDevice` for serialization in
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the libvirt XML template as <disk>.
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'''
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return qubes.devices.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 = {'name': self.name, 'pool': self.pool, 'vid': self.vid, }
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if self.internal:
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result['internal'] = self.internal
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if self.removable:
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result['removable'] = self.removable
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if self.revisions_to_keep:
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result['revisions_to_keep'] = self.revisions_to_keep
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if self.rw:
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result['rw'] = self.rw
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if self.save_on_stop:
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result['save_on_stop'] = self.save_on_stop
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if self.size:
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result['size'] = self.size
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if self.snap_on_start:
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result['snap_on_start'] = self.snap_on_start
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if self.source:
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result['source'] = self.source
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return result
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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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self.pools = {}
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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 'volume_type' in conf:
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conf = self._migrate_config(conf)
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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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self.pools[name] = pool
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return volume
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def _migrate_config(self, conf):
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''' Migrates from the old config style to new
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''' # FIXME: Remove this compatibility hack
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assert 'volume_type' in conf
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_type = conf['volume_type']
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old_volume_types = [
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'read-write', 'read-only', 'origin', 'snapshot', 'volatile'
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]
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msg = "Volume {!s} has unknown type {!s}".format(conf['name'], _type)
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assert conf['volume_type'] in old_volume_types, msg
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if _type == 'origin':
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conf['rw'] = True
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conf['source'] = None
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conf['save_on_stop'] = True
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conf['revisions_to_keep'] = 1
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elif _type == 'snapshot':
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conf['rw'] = False
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if conf['pool'] == 'default':
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template_vid = os.path.join('vm-templates',
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self.vm.template.name, conf['name'])
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elif conf['pool'] == 'qubes_dom0':
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template_vid = os.path.join(
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'qubes_dom0', self.vm.template.name + '-' + conf['name'])
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conf['source'] = template_vid
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conf['snap_on_start'] = True
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elif _type == 'read-write':
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conf['rw'] = True
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conf['save_on_stop'] = True
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conf['revisions_to_keep'] = 0
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elif _type == 'read-only':
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conf['rw'] = False
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conf['snap_on_start'] = True
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conf['save_on_stop'] = False
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conf['revisions_to_keep'] = 0
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elif _type == 'volatile':
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conf['snap_on_start'] = False
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conf['save_on_stop'] = False
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conf['revisions_to_keep'] = 0
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del conf['volume_type']
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return conf
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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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@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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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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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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self.get_pool(volume).resize(volume, size)
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if self.vm.is_running():
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self.vm.run_service('qubes.ResizeDisk', input=volume.name,
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user='root', wait=True)
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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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for volume in self.vm.volumes.values():
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self.get_pool(volume).create(volume)
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os.umask(old_umask)
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def clone(self, src_vm):
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''' Clone volumes from the specified vm '''
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src_path = src_vm.dir_path
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msg = "Source path {!s} does not exist".format(src_path)
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assert os.path.exists(src_path), msg
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dst_path = self.vm.dir_path
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msg = "Destination {!s} already exists".format(dst_path)
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assert not os.path.exists(dst_path), msg
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os.mkdir(dst_path)
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self.vm.volumes = {}
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with VmCreationManager(self.vm):
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for name, config in self.vm.volume_config.items():
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dst_pool = self.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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src_pool = self.vm.app.get_pool(src_volume.pool)
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if dst_pool == src_pool:
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msg = "Cloning 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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volume = dst_pool.clone(src_volume, dst)
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else:
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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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volume = dst_pool.import_volume(dst_pool, dst, src_pool,
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src_volume)
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assert volume, "%s.clone() returned '%s'" % (
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dst_pool.__class__.__name__, volume)
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self.vm.volumes[name] = volume
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msg = "Cloning directory: {!s} to {!s}"
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msg = msg.format(src_path, dst_path)
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self.log.info(msg)
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@property
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def outdated_volumes(self):
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''' Returns a list of outdated volumes '''
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result = []
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if self.vm.is_halted():
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return result
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volumes = self.vm.volumes
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for volume in volumes.values():
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pool = self.get_pool(volume)
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if pool.is_outdated(volume):
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result += [volume]
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return result
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def rename(self, old_name, new_name):
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''' Notify the pools that the domain was renamed '''
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volumes = self.vm.volumes
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vm = self.vm
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old_dir_path = os.path.join(os.path.dirname(vm.dir_path), old_name)
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new_dir_path = os.path.join(os.path.dirname(vm.dir_path), new_name)
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os.rename(old_dir_path, new_dir_path)
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for name, volume in volumes.items():
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pool = self.get_pool(volume)
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volumes[name] = pool.rename(volume, old_name, new_name)
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def verify(self):
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'''Verify that the storage is sane.
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On success, returns normally. On failure, raises exception.
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'''
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if not os.path.exists(self.vm.dir_path):
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raise qubes.exc.QubesVMError(
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self.vm,
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'VM directory does not exist: {}'.format(self.vm.dir_path))
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for volume in self.vm.volumes.values():
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self.get_pool(volume).verify(volume)
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self.vm.fire_event('domain-verify-files')
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return True
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def remove(self):
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''' Remove all the volumes.
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Errors on removal are catched and logged.
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'''
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for name, volume in self.vm.volumes.items():
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self.log.info('Removing volume %s: %s' % (name, volume.vid))
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try:
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self.get_pool(volume).remove(volume)
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except (IOError, OSError) as e:
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self.vm.log.exception("Failed to remove volume %s", name, e)
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def start(self):
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''' Execute the start method on each pool '''
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for volume in self.vm.volumes.values():
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pool = self.get_pool(volume)
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volume = pool.start(volume)
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def stop(self):
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''' Execute the start method on each pool '''
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for volume in self.vm.volumes.values():
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self.get_pool(volume).stop(volume)
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def get_pool(self, volume):
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''' Helper function '''
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assert isinstance(volume, (Volume, str)), \
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"You need to pass a Volume or pool name as str"
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if isinstance(volume, Volume):
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return self.pools[volume.name]
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else:
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return self.vm.app.pools[volume]
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def commit(self):
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''' Makes changes to an 'origin' volume persistent '''
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for volume in self.vm.volumes.values():
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if volume.save_on_stop:
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self.get_pool(volume).commit(volume)
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def unused_frontend(self):
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''' Find an unused device name '''
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unused_frontends = self.AVAILABLE_FRONTENDS.difference(
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self.used_frontends)
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return sorted(unused_frontends)[0]
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@property
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def used_frontends(self):
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''' Used device names '''
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xml = self.vm.libvirt_domain.XMLDesc()
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parsed_xml = lxml.etree.fromstring(xml)
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return set([target.get('dev', None)
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for target in parsed_xml.xpath(
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"//domain/devices/disk/target")])
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def export(self, volume):
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''' Helper function to export volume (pool.export(volume))'''
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assert isinstance(volume, (Volume, str)), \
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"You need to pass a Volume or pool name as str"
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if isinstance(volume, Volume):
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return self.pools[volume.name].export(volume)
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else:
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return self.pools[volume].export(self.vm.volumes[volume])
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class Pool(object):
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''' A Pool is used to manage different kind of volumes (File
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based/LVM/Btrfs/...).
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3rd Parties providing own storage implementations will need to extend
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this class.
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''' # pylint: disable=unused-argument
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private_img_size = qubes.config.defaults['private_img_size']
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root_img_size = qubes.config.defaults['root_img_size']
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def __init__(self, name, revisions_to_keep=1, **kwargs):
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super(Pool, self).__init__(**kwargs)
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self.name = name
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self.revisions_to_keep = revisions_to_keep
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kwargs['name'] = self.name
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def __eq__(self, other):
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return self.name == other.name
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def __neq__(self, other):
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return not self.__eq__(other)
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def __str__(self):
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return self.name
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def __xml__(self):
|
|
config = _sanitize_config(self.config)
|
|
return lxml.etree.Element('pool', **config)
|
|
|
|
def create(self, volume):
|
|
''' Create the given volume on disk or copy from provided
|
|
`source_volume`.
|
|
'''
|
|
raise self._not_implemented("create")
|
|
|
|
def commit(self, volume): # pylint: disable=no-self-use
|
|
''' Write the snapshot to disk '''
|
|
msg = "Got volume_type {!s} when expected 'snap'"
|
|
msg = msg.format(volume.volume_type)
|
|
assert volume.volume_type == 'snap', msg
|
|
|
|
@property
|
|
def config(self):
|
|
''' Returns the pool config to be written to qubes.xml '''
|
|
raise self._not_implemented("config")
|
|
|
|
def clone(self, source, target):
|
|
''' Clone volume '''
|
|
raise self._not_implemented("clone")
|
|
|
|
def destroy(self):
|
|
''' Called when removing the pool. Use this for implementation specific
|
|
clean up.
|
|
'''
|
|
raise self._not_implemented("destroy")
|
|
|
|
def export(self, volume):
|
|
''' Returns an object that can be `open()`. '''
|
|
raise self._not_implemented("export")
|
|
|
|
def import_volume(self, dst_pool, dst_volume, src_pool, src_volume):
|
|
''' Imports data to a volume in this pool '''
|
|
raise self._not_implemented("import_volume")
|
|
|
|
def init_volume(self, vm, volume_config):
|
|
''' Initialize a :py:class:`qubes.storage.Volume` from `volume_config`.
|
|
'''
|
|
raise self._not_implemented("init_volume")
|
|
|
|
def is_dirty(self, volume):
|
|
''' Return `True` if volume was not properly shutdown and commited '''
|
|
raise self._not_implemented("is_dirty")
|
|
|
|
def is_outdated(self, volume):
|
|
''' Returns `True` if the currently used `volume.source` of a snapshot
|
|
volume is outdated.
|
|
'''
|
|
raise self._not_implemented("is_outdated")
|
|
|
|
def recover(self, volume):
|
|
''' Try to recover a :py:class:`Volume` or :py:class:`SnapVolume` '''
|
|
raise self._not_implemented("recover")
|
|
|
|
def remove(self, volume):
|
|
''' Remove volume'''
|
|
raise self._not_implemented("remove")
|
|
|
|
def rename(self, volume, old_name, new_name):
|
|
''' Called when the domain changes its name '''
|
|
raise self._not_implemented("rename")
|
|
|
|
def reset(self, volume):
|
|
''' Drop and recreate volume without copying it's content from source.
|
|
'''
|
|
raise self._not_implemented("reset")
|
|
|
|
def resize(self, volume, size):
|
|
''' Expands volume, throws
|
|
:py:class:`qubes.storage.StoragePoolException` if
|
|
given size is less than current_size
|
|
'''
|
|
raise self._not_implemented("resize")
|
|
|
|
def revert(self, volume, revision=None):
|
|
''' Revert volume to previous revision '''
|
|
raise self._not_implemented("revert")
|
|
|
|
def setup(self):
|
|
''' Called when adding a pool to the system. Use this for implementation
|
|
specific set up.
|
|
'''
|
|
raise self._not_implemented("setup")
|
|
|
|
def start(self, volume): # pylint: disable=no-self-use
|
|
''' Do what ever is needed on start '''
|
|
raise self._not_implemented("start")
|
|
|
|
def stop(self, volume): # pylint: disable=no-self-use
|
|
''' Do what ever is needed on stop'''
|
|
|
|
def verify(self, volume):
|
|
''' Verifies the volume. '''
|
|
raise self._not_implemented("verify")
|
|
|
|
@property
|
|
def volumes(self):
|
|
''' Return a list of volumes managed by this pool '''
|
|
raise self._not_implemented("volumes")
|
|
|
|
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 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:
|
|
pool = self.vm.storage.get_pool(volume)
|
|
pool.remove(volume)
|
|
except Exception: # pylint: disable=broad-except
|
|
pass
|
|
os.rmdir(self.vm.dir_path)
|