172 rader
6.3 KiB
Python
172 rader
6.3 KiB
Python
#!/usr/bin/python2
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# -*- coding: utf-8 -*-
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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) 2010 Joanna Rutkowska <joanna@invisiblethingslab.com>
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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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import os
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import subprocess
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import sys
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from qubes.qubes import QubesVm,register_qubes_vm_class,dry_run
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from qubes.qubes import QubesVmCollection,QubesException,QubesVmLabels
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from qubes.qubes import defaults,system_path,vm_files
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class QubesTemplateVm(QubesVm):
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"""
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A class that represents an TemplateVM. A child of QubesVm.
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"""
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# In which order load this VM type from qubes.xml
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load_order = 50
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def get_attrs_config(self):
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attrs_config = super(QubesTemplateVm, self).get_attrs_config()
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attrs_config['dir_path']['func'] = \
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lambda value: value if value is not None else \
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os.path.join(system_path["qubes_templates_dir"], self.name)
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attrs_config['label']['default'] = defaults["template_label"]
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# New attributes
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# Image for template changes
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attrs_config['rootcow_img'] = {
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'func': lambda x: os.path.join(self.dir_path, vm_files["rootcow_img"]) }
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# Clean image for root-cow and swap (AppVM side)
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attrs_config['clean_volatile_img'] = {
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'func': lambda x: os.path.join(self.dir_path, vm_files["clean_volatile_img"]) }
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return attrs_config
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def __init__(self, **kwargs):
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super(QubesTemplateVm, self).__init__(**kwargs)
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self.appvms = QubesVmCollection()
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@property
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def type(self):
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return "TemplateVM"
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@property
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def updateable(self):
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return True
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def is_template(self):
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return True
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def get_firewall_defaults(self):
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return { "rules": list(), "allow": False, "allowDns": False, "allowIcmp": False, "allowYumProxy": True }
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# FIXME: source_template unused
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def get_rootdev(self, source_template=None):
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return self._format_disk_dev(
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"{dir}/root.img:{dir}/root-cow.img".format(
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dir=self.dir_path),
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"block-origin", "xvda", True)
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def clone_disk_files(self, src_vm, verbose):
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if dry_run:
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return
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super(QubesTemplateVm, self).clone_disk_files(src_vm=src_vm, verbose=verbose)
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if verbose:
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print >> sys.stderr, "--> Copying the template's clean volatile image:\n{0} ==>\n{1}".\
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format(src_vm.clean_volatile_img, self.clean_volatile_img)
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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", src_vm.clean_volatile_img, self.clean_volatile_img])
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if retcode != 0:
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raise IOError ("Error while copying {0} to {1}".\
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format(src_vm.clean_volatile_img, self.clean_volatile_img))
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if verbose:
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print >> sys.stderr, "--> Copying the template's volatile image:\n{0} ==>\n{1}".\
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format(self.clean_volatile_img, self.volatile_img)
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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", self.clean_volatile_img, self.volatile_img])
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if retcode != 0:
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raise IOError ("Error while copying {0} to {1}".\
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format(self.clean_img, self.volatile_img))
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# Create root-cow.img
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self.commit_changes(verbose=verbose)
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def post_rename(self, old_name):
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super(QubesTemplateVm, self).post_rename(old_name)
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old_dirpath = os.path.join(os.path.dirname(self.dir_path), old_name)
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self.clean_volatile_img = self.clean_volatile_img.replace(old_dirpath, self.dir_path)
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self.rootcow_img = self.rootcow_img.replace(old_dirpath, self.dir_path)
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def verify_files(self):
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if dry_run:
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return
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super(QubesTemplateVm, self).verify_files()
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if not os.path.exists (self.volatile_img):
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raise QubesException (
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"VM volatile image file doesn't exist: {0}".\
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format(self.volatile_img))
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if not os.path.exists (self.clean_volatile_img):
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raise QubesException (
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"Clean VM volatile image file doesn't exist: {0}".\
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format(self.clean_volatile_img))
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return True
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def reset_volatile_storage(self, verbose = False):
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assert not self.is_running(), "Attempt to clean volatile image of running Template VM!"
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if verbose:
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print >> sys.stderr, "--> Cleaning volatile image: {0}...".format (self.volatile_img)
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if dry_run:
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return
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if os.path.exists (self.volatile_img):
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os.remove (self.volatile_img)
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retcode = subprocess.call (["tar", "xf", self.clean_volatile_img, "-C", self.dir_path])
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if retcode != 0:
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raise IOError ("Error while unpacking {0} to {1}".\
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format(self.template.clean_volatile_img, self.volatile_img))
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def commit_changes (self, verbose = False):
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assert not self.is_running(), "Attempt to commit changes on running Template VM!"
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if verbose:
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print >> sys.stderr, "--> Commiting template updates... COW: {0}...".format (self.rootcow_img)
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if dry_run:
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return
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if os.path.exists (self.rootcow_img):
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os.rename (self.rootcow_img, self.rootcow_img + '.old')
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f_cow = open (self.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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f_cow.truncate (f_root.tell()) # make empty sparse file of the same size as root.img
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f_cow.close ()
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f_root.close()
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register_qubes_vm_class(QubesTemplateVm)
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