295 lines
10 KiB
Python
295 lines
10 KiB
Python
#!/usr/bin/python2 -O
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# vim: fileencoding=utf-8
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#
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# The Qubes OS Project, https://www.qubes-os.org/
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#
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# Copyright (C) 2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 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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from __future__ import absolute_import
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import os
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import os.path
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import re
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import subprocess
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import lxml.etree
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import qubes
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import qubes.config
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import qubes.storage
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import qubes.vm.templatevm
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class XenStorage(qubes.storage.Storage):
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'''Class for VM storage of Xen VMs.
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'''
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root_dev = 'xvda'
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private_dev = 'xvdb'
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volatile_dev = 'xvdc'
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modules_dev = 'xvdd'
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def __init__(self, vm, vmdir, **kwargs):
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""" Instantiate the storage.
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Args:
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vm: a QubesVM
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vmdir: the root directory of the pool
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"""
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assert vm is not None
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assert vmdir is not None
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super(XenStorage, self).__init__(vm, **kwargs)
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self.vmdir = vmdir
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@property
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def private_img(self):
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'''Path to the private image'''
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return self.abspath(qubes.config.vm_files['private_img'])
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@property
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def root_img(self):
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'''Path to the root image'''
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return self.vm.template.storage.root_img \
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if hasattr(self.vm, 'template') and self.vm.template \
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else self.abspath(qubes.config.vm_files['root_img'])
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@property
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def rootcow_img(self):
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'''Path to the root COW image'''
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if isinstance(self.vm, qubes.vm.templatevm.TemplateVM):
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return self.abspath(qubes.config.vm_files['rootcow_img'])
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return None
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@property
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def volatile_img(self):
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'''Path to the volatile image'''
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return self.abspath(qubes.config.vm_files['volatile_img'])
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def format_disk_dev(self, path, vdev, script=None, rw=True, devtype='disk',
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domain=None):
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if path is None:
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return ''
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element = lxml.etree.Element('disk')
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element.set('type', 'block')
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element.set('device', devtype)
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element.append(lxml.etree.Element('driver', name='phy'))
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element.append(lxml.etree.Element('source', dev=path))
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element.append(lxml.etree.Element('target', dev=vdev))
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if not rw:
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element.append(lxml.etree.Element('readonly'))
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if domain is not None:
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# XXX vm.name?
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element.append(lxml.etree.Element('domain', name=domain))
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if script:
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element.append(lxml.etree.Element('script', path=script))
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# TODO return element
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return lxml.etree.tostring(element)
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def root_dev_config(self):
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if isinstance(self.vm, qubes.vm.templatevm.TemplateVM):
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return self.format_disk_dev(
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'{root}:{rootcow}'.format(
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root=self.root_img,
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rootcow=self.rootcow_img),
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self.root_dev,
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script='block-origin')
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elif self.vm.hvm and hasattr(self.vm, 'template'):
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# HVM template-based VM - only one device-mapper layer, in dom0
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# (root+volatile)
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# HVM detection based on 'kernel' property is massive hack,
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# but taken from assumption that VM needs Qubes-specific kernel
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# (actually initramfs) to assemble the second layer of device-mapper
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return self.format_disk_dev(
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'{root}:{volatile}'.format(
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root=self.vm.template.storage.root_img,
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volatile=self.volatile_img),
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self.root_dev,
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script='block-snapshot')
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elif hasattr(self.vm, 'template'):
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# any other template-based VM - two device-mapper layers: one
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# in dom0 (here) from root+root-cow, and another one from
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# this+volatile.img
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return self.format_disk_dev(
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'{root}:{template_rootcow}'.format(
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root=self.root_img,
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template_rootcow=self.vm.template.storage.rootcow_img),
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self.root_dev,
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script='block-snapshot',
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rw=False)
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else:
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# standalone qube
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return self.format_disk_dev(self.root_img, self.root_dev)
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def private_dev_config(self):
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return self.format_disk_dev(self.private_img, self.private_dev)
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def volatile_dev_config(self):
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return self.format_disk_dev(self.volatile_img, self.volatile_dev)
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def create_on_disk_private_img(self, source_template=None):
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if source_template is None:
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f_private = open(self.private_img, 'a+b')
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f_private.truncate(self.private_img_size)
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f_private.close()
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else:
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self.vm.log.info("Copying the template's private image: {}".format(
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source_template.storage.private_img))
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self._copy_file(source_template.storage.private_img,
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self.private_img)
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def create_on_disk_root_img(self, source_template=None):
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if source_template is None:
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fd = open(self.root_img, 'a+b')
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fd.truncate(self.root_img_size)
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fd.close()
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elif self.vm.updateable:
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# if not updateable, just use template's disk
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self.vm.log.info("--> Copying the template's root image: {}".format(
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source_template.storage.root_img))
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self._copy_file(source_template.storage.root_img, self.root_img)
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def resize_private_img(self, size):
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fd = open(self.private_img, 'a+b')
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fd.truncate(size)
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fd.close()
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# find loop device if any
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p = subprocess.Popen(
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['sudo', 'losetup', '--associated', self.private_img],
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stdout=subprocess.PIPE)
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result = p.communicate()
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m = re.match(r'^(/dev/loop\d+):\s', result[0])
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if m is not None:
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loop_dev = m.group(1)
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# resize loop device
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subprocess.check_call(
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['sudo', 'losetup', '--set-capacity', loop_dev])
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def commit_template_changes(self):
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assert isinstance(self.vm, qubes.vm.templatevm.TemplateVM)
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# TODO: move rootcow_img to this class; the same for vm.is_outdated()
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if os.path.exists(self.vm.rootcow_img):
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os.rename(self.vm.rootcow_img, self.vm.rootcow_img + '.old')
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old_umask = os.umask(002)
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f_cow = open(self.vm.rootcow_img, 'w')
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f_root = open(self.root_img, 'r')
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f_root.seek(0, os.SEEK_END)
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# make empty sparse file of the same size as root.img
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f_cow.truncate(f_root.tell())
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f_cow.close()
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f_root.close()
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os.umask(old_umask)
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def reset_volatile_storage(self):
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try:
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# no template set, in any way (Standalone VM, Template VM)
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if self.vm.template is None:
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raise AttributeError
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# template-based HVM with only one device-mapper layer -
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# volatile.img used as upper layer on root.img, no root-cow.img
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# intermediate layer
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if self.vm.hvm:
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if os.path.exists(self.volatile_img):
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if self.vm.debug:
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if os.path.getmtime(self.vm.template.storage.root_img) \
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> os.path.getmtime(self.volatile_img):
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self.vm.log.warning(
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'Template have changed, resetting root.img')
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else:
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self.vm.log.warning(
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'Debug mode: not resetting root.img; if you'
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' want to force root.img reset, either'
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' update template VM, or remove volatile.img'
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' file.')
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return
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os.remove(self.volatile_img)
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# FIXME stat on f_root; with open() ...
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f_volatile = open(self.volatile_img, "w")
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f_root = open(self.vm.template.storage.root_img, "r")
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# make empty sparse file of the same size as root.img
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f_root.seek(0, os.SEEK_END)
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f_volatile.truncate(f_root.tell())
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f_volatile.close()
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f_root.close()
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return # XXX why is that? super() does not run
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except AttributeError: # self.vm.template
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pass
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super(XenStorage, self).reset_volatile_storage()
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def prepare_for_vm_startup(self):
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super(XenStorage, self).prepare_for_vm_startup()
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if self.drive is not None:
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# pylint: disable=unused-variable
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(drive_type, drive_domain, drive_path) = self.drive.split(":")
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if drive_domain.lower() != "dom0":
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# XXX "VM '{}' holding '{}' does not exists".format(
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drive_vm = self.vm.app.domains[drive_domain]
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if not drive_vm.is_running():
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raise qubes.exc.QubesVMNotRunningError(drive_vm,
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'VM {!r} holding {!r} isn\'t running'.format(
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drive_domain, drive_path))
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if self.rootcow_img and not os.path.exists(self.rootcow_img):
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self.commit_template_changes()
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class XenPool(qubes.storage.Pool):
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def get_storage(self):
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""" Returns an instantiated ``XenStorage``. """
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return XenStorage(self.vm, vmdir=self.vmdir)
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