186 行
6.6 KiB
Python
186 行
6.6 KiB
Python
#!/usr/bin/python2
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2013 Marek Marczykowski <marmarek@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (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
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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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 shutil
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import subprocess
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import sys
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from qubes.qubes import vm_files,system_path,defaults
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from qubes.qubes import QubesException
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import qubes.qubesutils
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class QubesVmStorage(object):
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"""
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Class for handling VM virtual disks. This is base class for all other
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implementations, mostly with Xen on Linux in mind.
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"""
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def __init__(self, vm,
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private_img_size = None,
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root_img_size = None,
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modules_img = None,
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modules_img_rw = False):
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self.vm = vm
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self.vmdir = vm.dir_path
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if private_img_size:
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self.private_img_size = private_img_size
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else:
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self.private_img_size = defaults['private_img_size']
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if root_img_size:
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self.root_img_size = root_img_size
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else:
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self.root_img_size = defaults['root_img_size']
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self.private_img = os.path.join(self.vmdir, vm_files["private_img"])
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if self.vm.template:
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self.root_img = self.vm.template.root_img
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else:
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self.root_img = os.path.join(self.vmdir, vm_files["root_img"])
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self.volatile_img = os.path.join(self.vmdir, vm_files["volatile_img"])
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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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def get_config_params(self):
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raise NotImplementedError
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def _copy_file(self, source, destination):
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"""
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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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retcode = subprocess.call (["cp", source, destination])
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if retcode != 0:
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raise IOError ("Error while copying {0} to {1}".\
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format(source, destination))
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def get_disk_utilization(self):
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return qubes.qubesutils.get_disk_usage(self.vmdir)
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def get_disk_utilization_private_img(self):
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return qubes.qubesutils.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, verbose, source_template = None):
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raise NotImplementedError
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def create_on_disk_root_img(self, verbose, source_template = None):
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raise NotImplementedError
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def create_on_disk(self, verbose, 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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if verbose:
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print >> sys.stderr, "--> Creating directory: {0}".format(self.vmdir)
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os.mkdir (self.vmdir)
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self.create_on_disk_private_img(verbose, source_template)
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self.create_on_disk_root_img(verbose, source_template)
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self.reset_volatile_storage(verbose, source_template)
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os.umask(old_umask)
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def clone_disk_files(self, src_vm, verbose):
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if verbose:
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print >> sys.stderr, "--> Creating directory: {0}".format(self.vmdir)
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os.mkdir (self.vmdir)
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if src_vm.private_img is not None and self.private_img is not None:
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if verbose:
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print >> sys.stderr, "--> Copying the private image:\n{0} ==>\n{1}".\
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format(src_vm.private_img, self.private_img)
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self._copy_file(src_vm.private_img, self.private_img)
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if src_vm.updateable and src_vm.root_img is not None and self.root_img is not None:
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if verbose:
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print >> sys.stderr, "--> Copying the root image:\n{0} ==>\n{1}".\
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format(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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def verify_files(self):
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if not os.path.exists (self.vmdir):
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raise QubesException (
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"VM directory doesn't exist: {0}".\
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format(self.vmdir))
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if self.vm.updateable and not os.path.exists (self.root_img):
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raise QubesException (
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"VM root image file doesn't exist: {0}".\
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format(self.root_img))
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if not os.path.exists (self.private_img):
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raise QubesException (
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"VM private image file doesn't exist: {0}".\
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format(self.private_img))
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if self.modules_img is not None:
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if not os.path.exists(self.modules_img):
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raise QubesException (
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"VM kernel modules image does not exists: {0}".\
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format(self.modules_img))
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def remove_from_disk(self):
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shutil.rmtree (self.vmdir)
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def reset_volatile_storage(self, verbose = False, 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:
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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 (eg after backup-restore)
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if not os.path.exists(self.volatile_img):
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if verbose:
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print >> sys.stderr, "--> Creating volatile image: {0}...".\
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format(self.volatile_img)
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subprocess.check_call([system_path["prepare_volatile_img_cmd"],
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self.volatile_img, str(self.root_img_size / 1024 / 1024)])
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def prepare_for_vm_startup(self, verbose):
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self.reset_volatile_storage(verbose=verbose)
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pass
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