#!/usr/bin/python2 # # The Qubes OS Project, http://www.qubes-os.org # # Copyright (C) 2013 Marek Marczykowski # Copyright (C) 2015 Wojtek Porczyk # # 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 importlib import os import os.path import re import shutil import subprocess import sys import qubes import qubes.utils class VMStorage(object): '''Class for handling VM virtual disks. This is base class for all other implementations, mostly with Xen on Linux in mind. ''' def __init__(self, vm, private_img_size=None, root_img_size=None, modules_img=None, modules_img_rw=False): #: Domain for which we manage storage self.vm = vm #: Size of the private image self.private_img_size = private_img_size \ if private_img_size is not None \ else qubes.config.defaults['private_img_size'] #: Size of the root image self.root_img_size = root_img_size \ if root_img_size is not None \ else qubes.config.defaults['root_img_size'] # For now compute this path still in QubesVm self.modules_img = modules_img self.modules_img_rw = modules_img_rw #: Additional drive (currently used only by HVM) self.drive = None @property def private_img(self): '''Path to the private image''' return self.abspath(qubes.config.vm_files['private_img']) @property def root_img(self): '''Path to the root image''' return self.vm.template.root_img if hasattr(self.vm, 'template') \ else self.abspath(qubes.config.vm_files['root_img']) @property def volatile_img(self): '''Path to the volatile image''' return self.abspath(qubes.config.vm_files['volatile_img']) def abspath(self, path, rel=None): '''Make absolute path. If given path is relative, it is interpreted as relative to :py:attr:`self.vm.dir_path` or given *rel*. ''' return path if os.path.isabs(path) \ else os.path.join(rel or self.vm.dir_path, path) def get_config_params(self): raise NotImplementedError() def _copy_file(self, source, destination): '''Effective file copy, preserving sparse files etc. ''' # TODO: Windows support # We prefer to use Linux's cp, because it nicely handles sparse files try: subprocess.check_call(['cp', source, destination]) except subprocess.CalledProcessError: raise IOError('Error while copying {!r} to {!r}'.format( source, destination)) def get_disk_utilization(self): return qubes.utils.get_disk_usage(self.vmdir) def get_disk_utilization_private_img(self): return qubes.utils.get_disk_usage(self.private_img) def get_private_img_sz(self): if not os.path.exists(self.private_img): return 0 return os.path.getsize(self.private_img) def resize_private_img(self, size): raise NotImplementedError() def create_on_disk_private_img(self, source_template=None): raise NotImplementedError() def create_on_disk_root_img(self, source_template=None): raise NotImplementedError() def create_on_disk(self, source_template=None): if source_template is None: source_template = self.vm.template old_umask = os.umask(002) self.vm.log.info('Creating directory: {0}'.format(self.vm.dir_path)) os.mkdir(self.vmdir) self.create_on_disk_private_img(verbose, source_template) self.create_on_disk_root_img(verbose, source_template) self.reset_volatile_storage(verbose, source_template) os.umask(old_umask) def clone_disk_files(self, src_vm): self.vm.log.info('Creating directory: {0}'.format(self.vm.dir_path)) os.mkdir(self.vm.dir_path) if hasattr(src_vm, 'private_img'): self.vm.log.info('Copying the private image: {} -> {}'.format( src_vm.private_img, self.vm.private_img)) self._copy_file(src_vm.private_img, self.vm.private_img) if src_vm.updateable and hasattr(src_vm, 'root_img'): self.vm.log.info('Copying the root image: {} -> {}'.format( src_vm.root_img, self.root_img)) self._copy_file(src_vm.root_img, self.root_img) # TODO: modules? # XXX which modules? -woju def rename(self, newpath, oldpath): '''Move storage directory, most likely during domain's rename. .. note:: The arguments are in different order than in :program:`cp` utility. .. versionchange:: 3.0 This is now dummy method that just passes everything to :py:func:`os.rename`. :param str newpath: New path :param str oldpath: Old path ''' os.rename(oldpath, newpath) def verify_files(self): if not os.path.exists(self.vm.dir_path): raise qubes.QubesException( 'VM directory does not exist: {}'.format(self.vmdir)) if hasattr(self.vm, 'root_img') and not os.path.exists(self.root_img): raise qubes.QubesException( 'VM root image file does not exist: {}'.format(self.root_img)) if hasattr(self.vm, 'private_img') \ and not os.path.exists(self.private_img): raise qubes.QubesException( 'VM private image file does not exist: {}'.format( self.private_img)) if self.modules_img is not None \ and not os.path.exists(self.modules_img): raise qubes.QubesException( 'VM kernel modules image does not exists: {}'.format( self.modules_img)) def remove_from_disk(self): shutil.rmtree(self.vm.dir_path) def reset_volatile_storage(self, source_template=None): if source_template is None: source_template = self.vm.template # Re-create only for template based VMs if source_template is not None and self.volatile_img: if os.path.exists(self.volatile_img): os.remove(self.volatile_img) # For StandaloneVM create it only if not already exists # (eg after backup-restore) if hasattr(self.vm, 'volatile_img') \ and not os.path.exists(self.vm.volatile_img): self.vm.log.info( 'Creating volatile image: {0}'.format(self.volatile_img)) subprocess.check_call([system_path["prepare_volatile_img_cmd"], self.volatile_img, str(self.root_img_size / 1024 / 1024)]) def prepare_for_vm_startup(self): self.reset_volatile_storage() if hasattr(self.vm, 'private_img') \ and not os.path.exists(self.private_img): self.vm.log.info('Creating empty VM private image file: {0}'.format( self.private_img)) self.storage.create_on_disk_private_img() def get_storage(vm): '''Factory yielding storage class instances for domains. :raises ImportError: when storage class specified in config cannot be found :raises KeyError: when storage class specified in config cannot be found ''' pkg, cls = qubes.config.defaults['storage_class'].strip().rsplit('.', 1) # this may raise ImportError or KeyError, that's okay return importlib.import_module(pkg).__dict__[cls](vm)