4dfb629dd8
Finally accepted patches uses different syntax: <backenddomain name=.../> tag instead of <source domain=.../>.
185 lines
6.7 KiB
Python
185 lines
6.7 KiB
Python
#!/usr/bin/python2
|
|
#
|
|
# The Qubes OS Project, http://www.qubes-os.org
|
|
#
|
|
# Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
|
|
#
|
|
# This program is free software; you can redistribute it and/or
|
|
# modify it under the terms of the GNU General Public License
|
|
# as published by the Free Software Foundation; either version 2
|
|
# of the License, or (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program; if not, write to the Free Software
|
|
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
#
|
|
#
|
|
|
|
from __future__ import absolute_import
|
|
|
|
import os
|
|
import os.path
|
|
import subprocess
|
|
import sys
|
|
import re
|
|
|
|
from qubes.storage import QubesVmStorage
|
|
from qubes.qubes import QubesException, vm_files
|
|
|
|
|
|
class QubesXenVmStorage(QubesVmStorage):
|
|
"""
|
|
Class for VM storage of Xen VMs.
|
|
"""
|
|
|
|
def __init__(self, vm, **kwargs):
|
|
super(QubesXenVmStorage, self).__init__(vm, **kwargs)
|
|
|
|
self.root_dev = "xvda"
|
|
self.private_dev = "xvdb"
|
|
self.volatile_dev = "xvdc"
|
|
self.modules_dev = "xvdd"
|
|
|
|
if self.vm.is_template():
|
|
self.rootcow_img = os.path.join(self.vmdir, vm_files["rootcow_img"])
|
|
else:
|
|
self.rootcow_img = None
|
|
|
|
def _format_disk_dev(self, path, script, vdev, rw=True, type="disk", domain=None):
|
|
if path is None:
|
|
return ''
|
|
template = " <disk type='block' device='{type}'>\n" \
|
|
" <driver name='phy'/>\n" \
|
|
" <source dev='{path}'/>\n" \
|
|
" <target dev='{vdev}' bus='xen'/>\n" \
|
|
"{params}" \
|
|
" </disk>\n"
|
|
params = ""
|
|
if not rw:
|
|
params += " <readonly/>\n"
|
|
if domain:
|
|
params += " <backenddomain name='%s'/>\n" % domain
|
|
if script:
|
|
params += " <script path='%s'/>\n" % script
|
|
return template.format(path=path, vdev=vdev, type=type,
|
|
params=params)
|
|
|
|
def _get_rootdev(self):
|
|
if self.vm.is_template():
|
|
return self._format_disk_dev(
|
|
"{dir}/root.img:{dir}/root-cow.img".format(
|
|
dir=self.vmdir),
|
|
"block-origin", self.root_dev, True)
|
|
elif self.vm.template:
|
|
return self._format_disk_dev(
|
|
"{dir}/root.img:{dir}/root-cow.img".format(
|
|
dir=self.vm.template.dir_path),
|
|
"block-snapshot", self.root_dev, False)
|
|
else:
|
|
return self._format_disk_dev(
|
|
"{dir}/root.img".format(dir=self.vmdir),
|
|
None, self.root_dev, True)
|
|
|
|
def get_config_params(self):
|
|
args = {}
|
|
args['rootdev'] = self._get_rootdev()
|
|
args['privatedev'] = \
|
|
self._format_disk_dev(self.private_img,
|
|
None, self.private_dev, True)
|
|
args['volatiledev'] = \
|
|
self._format_disk_dev(self.volatile_img,
|
|
None, self.volatile_dev, True)
|
|
if self.modules_img is not None:
|
|
args['otherdevs'] = \
|
|
self._format_disk_dev(self.modules_img,
|
|
None, self.modules_dev, self.modules_img_rw)
|
|
elif self.drive is not None:
|
|
(drive_type, drive_domain, drive_path) = self.drive.split(":")
|
|
if drive_domain.lower() == "dom0":
|
|
drive_domain = None
|
|
|
|
args['otherdevs'] = self._format_disk_dev(drive_path, None,
|
|
self.modules_dev,
|
|
rw=True if drive_type == "disk" else False, type=drive_type,
|
|
domain=drive_domain)
|
|
else:
|
|
args['otherdevs'] = ''
|
|
|
|
return args
|
|
|
|
def create_on_disk_private_img(self, verbose, source_template = None):
|
|
if source_template:
|
|
template_priv = source_template.private_img
|
|
if verbose:
|
|
print >> sys.stderr, "--> Copying the template's private image: {0}".\
|
|
format(template_priv)
|
|
self._copy_file(template_priv, self.private_img)
|
|
else:
|
|
f_private = open (self.private_img, "a+b")
|
|
f_private.truncate (self.private_img_size)
|
|
f_private.close ()
|
|
|
|
def create_on_disk_root_img(self, verbose, source_template = None):
|
|
if source_template:
|
|
if not self.vm.updateable:
|
|
# just use template's disk
|
|
return
|
|
else:
|
|
template_root = source_template.root_img
|
|
if verbose:
|
|
print >> sys.stderr, "--> Copying the template's root image: {0}".\
|
|
format(template_root)
|
|
|
|
self._copy_file(template_root, self.root_img)
|
|
else:
|
|
f_root = open (self.root_img, "a+b")
|
|
f_root.truncate (self.root_img_size)
|
|
f_root.close ()
|
|
if self.vm.is_template():
|
|
self.commit_template_changes()
|
|
|
|
def rename(self, old_name, new_name):
|
|
super(QubesXenVmStorage, self).rename(old_name, new_name)
|
|
|
|
old_dirpath = os.path.join(os.path.dirname(self.vmdir), old_name)
|
|
if self.rootcow_img:
|
|
self.rootcow_img = self.rootcow_img.replace(old_dirpath,
|
|
self.vmdir)
|
|
|
|
def resize_private_img(self, size):
|
|
f_private = open (self.private_img, "a+b")
|
|
f_private.truncate (size)
|
|
f_private.close ()
|
|
|
|
# find loop device if any
|
|
p = subprocess.Popen (["sudo", "losetup", "--associated", self.private_img],
|
|
stdout=subprocess.PIPE)
|
|
result = p.communicate()
|
|
m = re.match(r"^(/dev/loop\d+):\s", result[0])
|
|
if m is not None:
|
|
loop_dev = m.group(1)
|
|
|
|
# resize loop device
|
|
subprocess.check_call(["sudo", "losetup", "--set-capacity", loop_dev])
|
|
|
|
def commit_template_changes(self):
|
|
assert self.vm.is_template()
|
|
# TODO: move rootcow_img to this class; the same for vm.is_outdated()
|
|
if os.path.exists (self.rootcow_img):
|
|
os.rename (self.rootcow_img, self.rootcow_img + '.old')
|
|
|
|
old_umask = os.umask(002)
|
|
f_cow = open (self.rootcow_img, "w")
|
|
f_root = open (self.root_img, "r")
|
|
f_root.seek(0, os.SEEK_END)
|
|
f_cow.truncate (f_root.tell()) # make empty sparse file of the same size as root.img
|
|
f_cow.close ()
|
|
f_root.close()
|
|
os.umask(old_umask)
|
|
|