255 lines
8.4 KiB
Python
255 lines
8.4 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) 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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from __future__ import absolute_import
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import importlib
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import os
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import os.path
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import re
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import shutil
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import subprocess
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import sys
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import qubes
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import qubes.utils
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class VMStorage(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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''' # pylint: disable=abstract-class-little-used
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def __init__(self, vm, private_img_size=None, root_img_size=None,
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modules_img=None, modules_img_rw=False):
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#: Domain for which we manage storage
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self.vm = vm
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#: Size of the private image
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self.private_img_size = private_img_size \
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if private_img_size is not None \
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else qubes.config.defaults['private_img_size']
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#: Size of the root image
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self.root_img_size = root_img_size \
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if root_img_size is not None \
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else qubes.config.defaults['root_img_size']
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# For now compute this path still in QubesVm
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self.modules_img = modules_img
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self.modules_img_rw = modules_img_rw
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#: Additional drive (currently used only by HVM)
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self.drive = None
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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.root_img if hasattr(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 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 abspath(self, path, rel=None):
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'''Make absolute path.
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If given path is relative, it is interpreted as relative to
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:py:attr:`self.vm.dir_path` or given *rel*.
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'''
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return path if os.path.isabs(path) \
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else os.path.join(rel or self.vm.dir_path, path)
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def get_config_params(self):
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raise NotImplementedError()
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@staticmethod
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def _copy_file(source, destination):
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'''Effective file copy, preserving sparse files etc.
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'''
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# TODO: Windows support
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# We prefer to use Linux's cp, because it nicely handles sparse files
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try:
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subprocess.check_call(['cp', source, destination])
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except subprocess.CalledProcessError:
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raise IOError('Error while copying {!r} to {!r}'.format(
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source, destination))
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def get_disk_utilization(self):
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return qubes.utils.get_disk_usage(self.vm.dir_path)
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def get_disk_utilization_private_img(self):
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# pylint: disable=invalid-name
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return qubes.utils.get_disk_usage(self.private_img)
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def get_private_img_sz(self):
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if not os.path.exists(self.private_img):
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return 0
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return os.path.getsize(self.private_img)
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def resize_private_img(self, size):
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raise NotImplementedError()
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def create_on_disk_private_img(self, source_template=None):
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raise NotImplementedError()
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def create_on_disk_root_img(self, source_template=None):
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raise NotImplementedError()
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def create_on_disk(self, source_template=None):
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if source_template is None:
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source_template = self.vm.template
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old_umask = os.umask(002)
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self.vm.log.info('Creating directory: {0}'.format(self.vm.dir_path))
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os.mkdir(self.vm.dir_path)
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self.create_on_disk_private_img(source_template)
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self.create_on_disk_root_img(source_template)
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self.reset_volatile_storage(source_template)
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os.umask(old_umask)
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def clone_disk_files(self, src_vm):
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self.vm.log.info('Creating directory: {0}'.format(self.vm.dir_path))
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os.mkdir(self.vm.dir_path)
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if hasattr(src_vm, 'private_img'):
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self.vm.log.info('Copying the private image: {} -> {}'.format(
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src_vm.private_img, self.vm.private_img))
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self._copy_file(src_vm.private_img, self.vm.private_img)
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if src_vm.updateable and hasattr(src_vm, 'root_img'):
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self.vm.log.info('Copying the root image: {} -> {}'.format(
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src_vm.root_img, self.root_img))
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self._copy_file(src_vm.root_img, self.root_img)
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# TODO: modules?
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# XXX which modules? -woju
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@staticmethod
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def rename(newpath, oldpath):
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'''Move storage directory, most likely during domain's rename.
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.. note::
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The arguments are in different order than in :program:`cp` utility.
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.. versionchange:: 3.0
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This is now dummy method that just passes everything to
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:py:func:`os.rename`.
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:param str newpath: New path
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:param str oldpath: Old path
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'''
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os.rename(oldpath, newpath)
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def verify_files(self):
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if not os.path.exists(self.vm.dir_path):
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raise qubes.QubesException(
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'VM directory does not exist: {}'.format(self.vm.dir_path))
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if hasattr(self.vm, 'root_img') and not os.path.exists(self.root_img):
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raise qubes.QubesException(
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'VM root image file does not exist: {}'.format(self.root_img))
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if hasattr(self.vm, 'private_img') \
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and not os.path.exists(self.private_img):
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raise qubes.QubesException(
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'VM private image file does not exist: {}'.format(
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self.private_img))
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if self.modules_img is not None \
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and not os.path.exists(self.modules_img):
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raise qubes.QubesException(
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'VM kernel modules image does not exists: {}'.format(
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self.modules_img))
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def remove_from_disk(self):
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shutil.rmtree(self.vm.dir_path)
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def reset_volatile_storage(self, source_template=None):
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if source_template is None:
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source_template = self.vm.template
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# Re-create only for template based VMs
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if source_template is not None and self.volatile_img:
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if os.path.exists(self.volatile_img):
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os.remove(self.volatile_img)
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# For StandaloneVM create it only if not already exists
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# (eg after backup-restore)
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if hasattr(self.vm, 'volatile_img') \
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and not os.path.exists(self.vm.volatile_img):
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self.vm.log.info(
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'Creating volatile image: {0}'.format(self.volatile_img))
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subprocess.check_call(
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[qubes.config.system_path["prepare_volatile_img_cmd"],
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self.volatile_img,
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str(self.root_img_size / 1024 / 1024)])
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def prepare_for_vm_startup(self):
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self.reset_volatile_storage()
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if hasattr(self.vm, 'private_img') \
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and not os.path.exists(self.private_img):
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self.vm.log.info('Creating empty VM private image file: {0}'.format(
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self.private_img))
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self.create_on_disk_private_img()
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def get_storage(vm):
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'''Factory yielding storage class instances for domains.
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:raises ImportError: when storage class specified in config cannot be found
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:raises KeyError: when storage class specified in config cannot be found
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'''
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pkg, cls = qubes.config.defaults['storage_class'].strip().rsplit('.', 1)
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# this may raise ImportError or KeyError, that's okay
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return importlib.import_module(pkg).__dict__[cls](vm)
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