mirror of
https://github.com/virt-manager/virt-manager.git
synced 2024-10-27 10:25:25 +03:00
351 lines
12 KiB
Python
351 lines
12 KiB
Python
# Sample code to parse an image XML description and
|
|
# spit out libvirt XML; will be hooked into virt-install
|
|
#
|
|
# Copyright 2007, 2013 Red Hat, Inc.
|
|
# David Lutterkort <dlutter@redhat.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.
|
|
|
|
import logging
|
|
import os
|
|
|
|
import libxml2
|
|
import urlgrabber
|
|
|
|
from virtinst import CapabilitiesParser
|
|
from virtinst import util
|
|
|
|
|
|
class ParserException(Exception):
|
|
def __init__(self, msg):
|
|
Exception.__init__(self, msg)
|
|
|
|
|
|
class Image:
|
|
"""The toplevel object representing a VM image"""
|
|
def __init__(self, node=None, base=None, filename=None):
|
|
self.storage = {}
|
|
self.domain = None
|
|
if filename is None:
|
|
self.filename = None
|
|
else:
|
|
self.filename = os.path.abspath(filename)
|
|
if base is None:
|
|
if filename is not None:
|
|
self.base = os.path.dirname(filename)
|
|
if self.base == '':
|
|
self.base = "."
|
|
else:
|
|
self.base = "."
|
|
else:
|
|
self.base = base
|
|
self.name = None
|
|
self.label = None
|
|
self.descr = None
|
|
self.version = None
|
|
self.release = None
|
|
if not node is None:
|
|
self.parseXML(node)
|
|
|
|
def abspath(self, p):
|
|
"""Turn P into an absolute path. Relative paths are taken relative
|
|
to self.BASE"""
|
|
return os.path.abspath(os.path.join(self.base, p))
|
|
|
|
def parseXML(self, node):
|
|
self.name = xpathString(node, "name")
|
|
self.label = xpathString(node, "label")
|
|
self.descr = xpathString(node, "description")
|
|
self.version = xpathString(node, "name/@version")
|
|
self.release = xpathString(node, "name/@release")
|
|
for d in node.xpathEval("storage/disk"):
|
|
disk = Disk(d)
|
|
if disk.file is None:
|
|
disk.id = "disk%d.img" % len(self.storage)
|
|
disk.file = "disk%d.img" % (len(self.storage) + 1)
|
|
if disk.id in self.storage:
|
|
raise ParserException("Disk file '%s' defined twice"
|
|
% disk.file)
|
|
self.storage[disk.id] = disk
|
|
lm = node.xpathEval("domain")
|
|
if len(lm) == 1:
|
|
self.domain = Domain(lm[0])
|
|
else:
|
|
raise ParserException(_("Expected exactly one 'domain' element"))
|
|
# Connect the disk maps to the disk definitions
|
|
for boot in self.domain.boots:
|
|
for d in boot.drives:
|
|
if d.disk_id not in self.storage:
|
|
raise ParserException(_("Disk entry for '%s' not found")
|
|
% d.disk_id)
|
|
d.disk = self.storage[d.disk_id]
|
|
|
|
|
|
class Domain:
|
|
"""The description of a virtual domain as part of an image"""
|
|
def __init__(self, node=None):
|
|
self.boots = []
|
|
self.vcpu = None
|
|
self.memory = None
|
|
self.interface = 0
|
|
self.graphics = None
|
|
if not node is None:
|
|
self.parseXML(node)
|
|
|
|
def parseXML(self, node):
|
|
self.boots = [Boot(b) for b in node.xpathEval("boot")]
|
|
self.vcpu = xpathString(node, "devices/vcpu", 1)
|
|
tmpmem = xpathString(node, "devices/memory")
|
|
self.interface = int(node.xpathEval("count(devices/interface)"))
|
|
self.graphics = node.xpathEval("count(devices/graphics)") > 0
|
|
|
|
if tmpmem is not None:
|
|
try:
|
|
self.memory = int(tmpmem)
|
|
except ValueError:
|
|
raise ParserException(_("Memory must be an integer, "
|
|
"but is '%s'") % self.memory)
|
|
else:
|
|
tmpmem = 0
|
|
|
|
|
|
class ImageFeatures(CapabilitiesParser.Features):
|
|
def __init__(self, node=None):
|
|
CapabilitiesParser.Features.__init__(self, node)
|
|
|
|
def _extractFeature(self, feature, d, n):
|
|
state = xpathString(n, "@state", "on")
|
|
|
|
if state == "on":
|
|
d[feature] = CapabilitiesParser.FEATURE_ON
|
|
elif state == "off":
|
|
d[feature] = CapabilitiesParser.FEATURE_OFF
|
|
else:
|
|
raise ParserException("The state for feature %s must be either 'on' or 'off', but is '%s'" % (feature, state))
|
|
|
|
|
|
class Boot:
|
|
"""The overall description of how the image can be booted, including
|
|
required capabilities of the host and mapping of disks into the VM"""
|
|
def __init__(self, node=None):
|
|
# 'xen' or 'hvm'
|
|
self.type = None
|
|
# Either 'pygrub' or nothing; might have others in the future
|
|
# For HVM, figure outhte right loader based on the guest
|
|
self.loader = None
|
|
# Only used for hvm
|
|
self.bootdev = None
|
|
self.kernel = None
|
|
self.initrd = None
|
|
self.cmdline = None
|
|
self.drives = []
|
|
self.arch = None
|
|
self.features = ImageFeatures()
|
|
if not node is None:
|
|
self.parseXML(node)
|
|
|
|
def parseXML(self, node):
|
|
self.type = xpathString(node, "@type")
|
|
self.loader = xpathString(node, "os/loader")
|
|
self.bootdev = xpathString(node, "os/loader/@dev")
|
|
self.kernel = xpathString(node, "os/kernel")
|
|
self.initrd = xpathString(node, "os/initrd")
|
|
self.cmdline = xpathString(node, "os/cmdline")
|
|
self.arch = util.sanitize_arch(xpathString(node, "guest/arch"))
|
|
|
|
fl = node.xpathEval("guest/features")
|
|
if len(fl) > 1:
|
|
raise ParserException("Expected at most one <features> element in %s boot descriptor for %s" % (self.type, self.arch))
|
|
elif len(fl) == 1:
|
|
self.features = ImageFeatures(fl[0])
|
|
|
|
for d in node.xpathEval("drive"):
|
|
self.drives.append(Drive(d))
|
|
|
|
validate(self.type is not None,
|
|
"The boot type must be provided")
|
|
validate(self.type == "hvm" or self.type == "xen",
|
|
"Boot type must be 'xen' or 'hvm', but is %s" % self.type)
|
|
validate(self.arch is not None, "Missing guest arch")
|
|
validate(self.loader is None or self.loader == "pygrub",
|
|
"Invalid loader %s" % self.loader)
|
|
validate([None, "hd", "cdrom"].count(self.bootdev) > 0,
|
|
"Invalid bootdev %s" % self.bootdev)
|
|
# We should make sure that kernel/initrd/cmdline are only used for pv
|
|
# and without a loader
|
|
|
|
|
|
class Drive:
|
|
"""The mapping of a disk from the storage section to a virtual drive
|
|
in a guest"""
|
|
def __init__(self, node=None):
|
|
self.disk_id = None
|
|
self.target = None
|
|
self.disk = None # Will point to the underlying Disk object
|
|
if node:
|
|
self.parseXML(node)
|
|
|
|
def parseXML(self, node):
|
|
self.disk_id = xpathString(node, "@disk")
|
|
self.target = xpathString(node, "@target")
|
|
|
|
|
|
class Disk:
|
|
FORMAT_RAW = "raw"
|
|
FORMAT_ISO = "iso"
|
|
FORMAT_QCOW = "qcow"
|
|
FORMAT_QCOW2 = "qcow2"
|
|
FORMAT_VMDK = "vmdk"
|
|
FORMAT_VDI = "vdi"
|
|
|
|
USE_SYSTEM = "system"
|
|
USE_USER = "user"
|
|
USE_SCRATCH = "scratch"
|
|
|
|
def __init__(self, node=None):
|
|
self.id = None
|
|
self.file = None
|
|
self.format = None
|
|
self.size = None
|
|
self.use = None
|
|
self.csum = {}
|
|
if not node is None:
|
|
self.parseXML(node)
|
|
|
|
def parseXML(self, node):
|
|
self.file = xpathString(node, "@file")
|
|
self.id = xpathString(node, "@id", self.file)
|
|
self.format = xpathString(node, "@format", Disk.FORMAT_RAW)
|
|
self.size = xpathString(node, "@size")
|
|
self.use = xpathString(node, "@use", Disk.USE_SYSTEM)
|
|
|
|
for d in node.xpathEval("checksum"):
|
|
csumtype = xpathString(d, "@type")
|
|
csumvalue = xpathString(d, "")
|
|
self.csum[csumtype] = csumvalue
|
|
formats = [Disk.FORMAT_RAW,
|
|
Disk.FORMAT_QCOW,
|
|
Disk.FORMAT_QCOW2,
|
|
Disk.FORMAT_VMDK,
|
|
Disk.FORMAT_ISO,
|
|
Disk.FORMAT_VDI]
|
|
validate(formats.count(self.format) > 0,
|
|
_("The format for disk %s must be one of %s") %
|
|
(self.file, ",".join(formats)))
|
|
|
|
def check_disk_signature(self, meter=None):
|
|
try:
|
|
import hashlib
|
|
sha = None
|
|
except:
|
|
import sha
|
|
hashlib = None
|
|
|
|
if meter is None:
|
|
meter = urlgrabber.progress.BaseMeter()
|
|
|
|
m = None
|
|
if hashlib:
|
|
if "sha256" in self.csum:
|
|
csumvalue = self.csum["sha256"]
|
|
m = hashlib.sha256()
|
|
|
|
elif "sha1" in self.csum:
|
|
csumvalue = self.csum["sha1"]
|
|
m = hashlib.sha1()
|
|
else:
|
|
if "sha1" in self.csum:
|
|
csumvalue = self.csum["sha1"]
|
|
m = sha.new()
|
|
|
|
if not m:
|
|
return
|
|
|
|
meter_ct = 0
|
|
disk_size = os.path.getsize(self.file)
|
|
meter.start(size=disk_size,
|
|
text=_("Checking disk signature for %s" % self.file))
|
|
|
|
f = file(self.file)
|
|
while 1:
|
|
chunk = f.read(65536)
|
|
if not chunk:
|
|
break
|
|
meter.update(meter_ct)
|
|
meter_ct = meter_ct + 65536
|
|
m.update(chunk)
|
|
checksum = m.hexdigest()
|
|
if checksum != csumvalue:
|
|
logging.debug(_("Disk signature for %s does not match "
|
|
"Expected: %s Received: %s" % (self.file,
|
|
csumvalue, checksum)))
|
|
raise ValueError(_("Disk signature for %s does not "
|
|
"match" % self.file))
|
|
|
|
|
|
def validate(cond, msg):
|
|
if not cond:
|
|
raise ParserException(msg)
|
|
|
|
|
|
def xpathString(node, path, default=None):
|
|
result = node.xpathEval("string(%s)" % path)
|
|
if len(result) == 0:
|
|
result = default
|
|
return result
|
|
|
|
|
|
def parse(xml, filename):
|
|
"""Parse the XML description of a VM image into a data structure. Returns
|
|
an object of class Image. BASE should be the directory where the disk
|
|
image files for this image can be found"""
|
|
|
|
class ErrorHandler:
|
|
def __init__(self):
|
|
self.msg = ""
|
|
def handler(self, ignore, s):
|
|
self.msg += s
|
|
error = ErrorHandler()
|
|
libxml2.registerErrorHandler(error.handler, None)
|
|
|
|
try:
|
|
try:
|
|
doc = libxml2.readMemory(xml, len(xml),
|
|
None, None,
|
|
libxml2.XML_PARSE_NOBLANKS)
|
|
except (libxml2.parserError, libxml2.treeError), e:
|
|
raise ParserException("%s\n%s" % (e, error.msg))
|
|
finally:
|
|
libxml2.registerErrorHandler(None, None)
|
|
|
|
try:
|
|
root = doc.getRootElement()
|
|
if root.name != "image":
|
|
raise ParserException(_("Root element is not 'image'"))
|
|
|
|
image = Image(root, filename=filename)
|
|
finally:
|
|
doc.freeDoc()
|
|
|
|
return image
|
|
|
|
|
|
def parse_file(filename):
|
|
f = open(filename, "r")
|
|
xml = f.read()
|
|
f.close()
|
|
return parse(xml, filename=filename)
|