519 lines
17 KiB
Python
519 lines
17 KiB
Python
#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2016 Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
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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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''' Driver for storing vm images in a LVM thin pool '''
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import logging
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import operator
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import os
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import subprocess
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import time
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import asyncio
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import qubes
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import qubes.storage
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import qubes.utils
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def check_lvm_version():
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#Check if lvm is very very old, like in Travis-CI
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try:
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lvm_help = subprocess.check_output(['lvm', 'lvcreate', '--help'],
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stderr=subprocess.DEVNULL).decode()
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return '--setactivationskip' not in lvm_help
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except (subprocess.CalledProcessError, FileNotFoundError):
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pass
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lvm_is_very_old = check_lvm_version()
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class ThinPool(qubes.storage.Pool):
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''' LVM Thin based pool implementation
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''' # pylint: disable=protected-access
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size_cache = None
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driver = 'lvm_thin'
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def __init__(self, volume_group, thin_pool, revisions_to_keep=1, **kwargs):
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super(ThinPool, self).__init__(revisions_to_keep=revisions_to_keep,
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**kwargs)
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self.volume_group = volume_group
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self.thin_pool = thin_pool
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self._pool_id = "{!s}/{!s}".format(volume_group, thin_pool)
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self.log = logging.getLogger('qube.storage.lvm.%s' % self._pool_id)
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self._volume_objects_cache = {}
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@property
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def config(self):
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return {
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'name': self.name,
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'volume_group': self.volume_group,
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'thin_pool': self.thin_pool,
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'driver': ThinPool.driver
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}
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def destroy(self):
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pass # TODO Should we remove an existing pool?
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def init_volume(self, vm, volume_config):
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''' Initialize a :py:class:`qubes.storage.Volume` from `volume_config`.
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'''
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if 'vid' not in volume_config.keys():
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if vm and hasattr(vm, 'name'):
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vm_name = vm.name
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else:
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# for the future if we have volumes not belonging to a vm
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vm_name = qubes.utils.random_string()
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assert self.name
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volume_config['vid'] = "{!s}/vm-{!s}-{!s}".format(
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self.volume_group, vm_name, volume_config['name'])
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volume_config['volume_group'] = self.volume_group
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volume_config['pool'] = self
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volume = ThinVolume(**volume_config)
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self._volume_objects_cache[volume_config['vid']] = volume
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return volume
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def setup(self):
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pass # TODO Should we create a non existing pool?
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def get_volume(self, vid):
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''' Return a volume with given vid'''
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if vid in self._volume_objects_cache:
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return self._volume_objects_cache[vid]
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config = {
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'pool': self,
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'vid': vid,
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'name': vid,
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'volume_group': self.volume_group,
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}
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# don't cache this object, as it doesn't carry full configuration
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return ThinVolume(**config)
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def list_volumes(self):
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''' Return a list of volumes managed by this pool '''
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volumes = []
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for vid, vol_info in size_cache.items():
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if not vid.startswith(self.volume_group + '/'):
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continue
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if vol_info['pool_lv'] != self.thin_pool:
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continue
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if vid.endswith('-snap'):
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# implementation detail volume
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continue
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if vid.endswith('-back'):
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# old revisions
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continue
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config = {
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'pool': self,
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'vid': vid,
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'name': vid,
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'volume_group': self.volume_group,
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'rw': vol_info['attr'][1] == 'w',
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}
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volumes += [ThinVolume(**config)]
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return volumes
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def init_cache(log=logging.getLogger('qubes.storage.lvm')):
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cmd = ['lvs', '--noheadings', '-o',
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'vg_name,pool_lv,name,lv_size,data_percent,lv_attr,origin',
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'--units', 'b', '--separator', ';']
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if os.getuid() != 0:
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cmd.insert(0, 'sudo')
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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close_fds=True)
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out, err = p.communicate()
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return_code = p.returncode
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if return_code == 0 and err:
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log.warning(err)
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elif return_code != 0:
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raise qubes.storage.StoragePoolException(err)
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result = {}
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for line in out.splitlines():
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line = line.decode().strip()
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pool_name, pool_lv, name, size, usage_percent, attr, \
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origin = line.split(';', 6)
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if '' in [pool_name, pool_lv, name, size, usage_percent]:
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continue
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name = pool_name + "/" + name
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size = int(size[:-1]) # Remove 'B' suffix
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usage = int(size / 100 * float(usage_percent))
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result[name] = {'size': size, 'usage': usage, 'pool_lv': pool_lv,
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'attr': attr, 'origin': origin}
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return result
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size_cache = init_cache()
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class ThinVolume(qubes.storage.Volume):
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''' Default LVM thin volume implementation
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''' # pylint: disable=too-few-public-methods
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def __init__(self, volume_group, size=0, **kwargs):
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self.volume_group = volume_group
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super(ThinVolume, self).__init__(size=size, **kwargs)
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self.log = logging.getLogger('qube.storage.lvm.%s' % str(self.pool))
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if self.snap_on_start or self.save_on_stop:
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self._vid_snap = self.vid + '-snap'
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self._size = size
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@property
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def path(self):
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return '/dev/' + self.vid
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@property
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def revisions(self):
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name_prefix = self.vid + '-'
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revisions = {}
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for revision_vid in size_cache:
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if not revision_vid.startswith(name_prefix):
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continue
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if not revision_vid.endswith('-back'):
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continue
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revision_vid = revision_vid[len(name_prefix):]
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seconds = int(revision_vid[:-len('-back')])
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iso_date = qubes.storage.isodate(seconds).split('.', 1)[0]
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revisions[revision_vid] = iso_date
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return revisions
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@property
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def size(self):
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try:
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return qubes.storage.lvm.size_cache[self.vid]['size']
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except KeyError:
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return self._size
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@size.setter
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def size(self, _):
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raise qubes.storage.StoragePoolException(
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"You shouldn't use lvm size setter")
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def _reset(self):
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''' Resets a volatile volume '''
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assert not self.snap_on_start and not self.save_on_stop, \
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"Not a volatile volume"
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self.log.debug('Resetting volatile ' + self.vid)
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try:
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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except qubes.storage.StoragePoolException:
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pass
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# pylint: disable=protected-access
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cmd = ['create', self.pool._pool_id, self.vid.split('/')[1],
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str(self.size)]
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qubes_lvm(cmd, self.log)
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def _remove_revisions(self, revisions=None):
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'''Remove old volume revisions.
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If no revisions list is given, it removes old revisions according to
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:py:attr:`revisions_to_keep`
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:param revisions: list of revisions to remove
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'''
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if revisions is None:
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revisions = sorted(self.revisions.items(),
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key=operator.itemgetter(1))
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revisions = revisions[:-self.revisions_to_keep]
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revisions = [rev_id for rev_id, _ in revisions]
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for rev_id in revisions:
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try:
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cmd = ['remove', self.vid + rev_id]
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qubes_lvm(cmd, self.log)
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except qubes.storage.StoragePoolException:
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pass
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def _commit(self):
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msg = "Trying to commit {!s}, but it has save_on_stop == False"
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msg = msg.format(self)
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assert self.save_on_stop, msg
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msg = "Trying to commit {!s}, but it has rw == False"
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msg = msg.format(self)
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assert self.rw, msg
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assert hasattr(self, '_vid_snap')
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if self.revisions_to_keep > 0:
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cmd = ['clone', self.vid,
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'{}-{}-back'.format(self.vid, int(time.time()))]
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qubes_lvm(cmd, self.log)
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self._remove_revisions()
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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cmd = ['clone', self._vid_snap, self.vid]
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qubes_lvm(cmd, self.log)
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def create(self):
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assert self.vid
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assert self.size
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if self.save_on_stop:
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if self.source:
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cmd = ['clone', str(self.source), self.vid]
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else:
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cmd = [
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'create',
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self.pool._pool_id, # pylint: disable=protected-access
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self.vid.split('/', 1)[1],
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str(self.size)
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]
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qubes_lvm(cmd, self.log)
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reset_cache()
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return self
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def remove(self):
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assert self.vid
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if self.is_dirty():
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cmd = ['remove', self._vid_snap]
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qubes_lvm(cmd, self.log)
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self._remove_revisions(self.revisions.keys())
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if not os.path.exists(self.path):
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return
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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reset_cache()
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# pylint: disable=protected-access
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self.pool._volume_objects_cache.pop(self.vid, None)
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def export(self):
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''' Returns an object that can be `open()`. '''
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# make sure the device node is available
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qubes_lvm(['activate', self.vid], self.log)
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devpath = '/dev/' + self.vid
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return devpath
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@asyncio.coroutine
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def import_volume(self, src_volume):
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if not src_volume.save_on_stop:
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return self
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# HACK: neat trick to speed up testing if you have same physical thin
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# pool assigned to two qubes-pools i.e: qubes_dom0 and test-lvm
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# pylint: disable=line-too-long
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if isinstance(src_volume.pool, ThinPool) and \
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src_volume.pool.thin_pool == self.pool.thin_pool: # NOQA
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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cmd = ['clone', str(src_volume), str(self)]
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qubes_lvm(cmd, self.log)
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else:
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src_path = src_volume.export()
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cmd = ['dd', 'if=' + src_path, 'of=/dev/' + self.vid,
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'conv=sparse']
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p = yield from asyncio.create_subprocess_exec(*cmd)
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yield from p.wait()
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if p.returncode != 0:
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raise qubes.storage.StoragePoolException(
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'Failed to import volume {!r}, dd exit code: {}'.format(
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src_volume, p.returncode))
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reset_cache()
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return self
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def import_data(self):
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''' Returns an object that can be `open()`. '''
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devpath = '/dev/' + self.vid
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return devpath
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def is_dirty(self):
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if self.save_on_stop:
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return os.path.exists('/dev/' + self._vid_snap)
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return False
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def is_outdated(self):
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if not self.snap_on_start:
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return False
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if self._vid_snap not in size_cache:
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return False
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return (size_cache[self._vid_snap]['origin'] !=
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self.source.vid.split('/')[1])
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def revert(self, revision=None):
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if revision is None:
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revision = \
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max(self.revisions.items(), key=operator.itemgetter(1))[0]
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old_path = self.path + '-' + revision
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if not os.path.exists(old_path):
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msg = "Volume {!s} has no {!s}".format(self, old_path)
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raise qubes.storage.StoragePoolException(msg)
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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cmd = ['clone', self.vid + '-' + revision, self.vid]
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qubes_lvm(cmd, self.log)
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reset_cache()
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return self
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def resize(self, size):
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''' Expands volume, throws
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:py:class:`qubst.storage.qubes.storage.StoragePoolException` if
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given size is less than current_size
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'''
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if not self.rw:
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msg = 'Can not resize reađonly volume {!s}'.format(self)
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raise qubes.storage.StoragePoolException(msg)
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if size < self.size:
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raise qubes.storage.StoragePoolException(
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'For your own safety, shrinking of %s is'
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' disabled. If you really know what you'
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' are doing, use `lvresize` on %s manually.' %
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(self.name, self.vid))
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cmd = ['extend', self.vid, str(size)]
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qubes_lvm(cmd, self.log)
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if self.is_dirty():
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cmd = ['extend', self._vid_snap, str(size)]
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qubes_lvm(cmd, self.log)
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reset_cache()
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def _snapshot(self):
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try:
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cmd = ['remove', self._vid_snap]
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qubes_lvm(cmd, self.log)
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except: # pylint: disable=bare-except
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pass
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if self.source is None:
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cmd = ['clone', self.vid, self._vid_snap]
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else:
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cmd = ['clone', str(self.source), self._vid_snap]
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qubes_lvm(cmd, self.log)
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def start(self):
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if self.snap_on_start or self.save_on_stop:
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if not self.save_on_stop or not self.is_dirty():
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self._snapshot()
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else:
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self._reset()
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reset_cache()
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return self
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def stop(self):
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if self.save_on_stop:
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self._commit()
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if self.snap_on_start or self.save_on_stop:
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cmd = ['remove', self._vid_snap]
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qubes_lvm(cmd, self.log)
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else:
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cmd = ['remove', self.vid]
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qubes_lvm(cmd, self.log)
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reset_cache()
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return self
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def verify(self):
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''' Verifies the volume. '''
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try:
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vol_info = size_cache[self.vid]
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return vol_info['attr'][4] == 'a'
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except KeyError:
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return False
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def block_device(self):
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''' Return :py:class:`qubes.storage.BlockDevice` for serialization in
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the libvirt XML template as <disk>.
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'''
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if self.snap_on_start or self.save_on_stop:
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return qubes.storage.BlockDevice(
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'/dev/' + self._vid_snap, self.name, self.script,
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self.rw, self.domain, self.devtype)
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return super(ThinVolume, self).block_device()
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@property
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def usage(self): # lvm thin usage always returns at least the same usage as
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# the parent
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try:
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return qubes.storage.lvm.size_cache[self.vid]['usage']
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except KeyError:
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return 0
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def pool_exists(pool_id):
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''' Return true if pool exists '''
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try:
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vol_info = size_cache[pool_id]
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return vol_info['attr'][0] == 't'
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except KeyError:
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return False
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def qubes_lvm(cmd, log=logging.getLogger('qubes.storage.lvm')):
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''' Call :program:`lvm` to execute an LVM operation '''
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action = cmd[0]
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if action == 'remove':
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lvm_cmd = ['lvremove', '-f', cmd[1]]
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elif action == 'clone':
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lvm_cmd = ['lvcreate', '-kn', '-ay', '-s', cmd[1], '-n', cmd[2]]
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elif action == 'create':
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lvm_cmd = ['lvcreate', '-T', cmd[1], '-kn', '-ay', '-n', cmd[2], '-V',
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str(cmd[3]) + 'B']
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elif action == 'extend':
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size = int(cmd[2]) / (1024 * 1024)
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lvm_cmd = ["lvextend", "-L%s" % size, cmd[1]]
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elif action == 'activate':
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lvm_cmd = ['lvchange', '-ay', cmd[1]]
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else:
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raise NotImplementedError('unsupported action: ' + action)
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if lvm_is_very_old:
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# old lvm in trusty image used there does not support -k option
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lvm_cmd = [x for x in lvm_cmd if x != '-kn']
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if os.getuid() != 0:
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cmd = ['sudo', 'lvm'] + lvm_cmd
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else:
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cmd = ['lvm'] + lvm_cmd
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p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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close_fds=True)
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out, err = p.communicate()
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return_code = p.returncode
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if out:
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log.debug(out)
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if return_code == 0 and err:
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log.warning(err)
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elif return_code != 0:
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assert err, "Command exited unsuccessful, but printed nothing to stderr"
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raise qubes.storage.StoragePoolException(err)
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return True
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def reset_cache():
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qubes.storage.lvm.size_cache = init_cache()
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