1031 lines
34 KiB
Python
1031 lines
34 KiB
Python
#
|
|
# Classes for building disk device xml
|
|
#
|
|
# Copyright 2006-2008, 2012-2014 Red Hat, Inc.
|
|
# Jeremy Katz <katzj@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 os
|
|
import stat
|
|
import pwd
|
|
import subprocess
|
|
import logging
|
|
import re
|
|
|
|
from . import diskbackend
|
|
from . import util
|
|
from .device import VirtualDevice
|
|
from .xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
|
|
|
|
|
|
def _qemu_sanitize_drvtype(phystype, fmt, manual_format=False):
|
|
"""
|
|
Sanitize libvirt storage volume format to a valid qemu driver type
|
|
"""
|
|
raw_list = ["iso"]
|
|
|
|
if phystype == VirtualDisk.TYPE_BLOCK:
|
|
if not fmt:
|
|
return VirtualDisk.DRIVER_TYPE_RAW
|
|
if fmt and not manual_format:
|
|
return VirtualDisk.DRIVER_TYPE_RAW
|
|
|
|
if fmt in raw_list:
|
|
return VirtualDisk.DRIVER_TYPE_RAW
|
|
|
|
return fmt
|
|
|
|
|
|
def _is_dir_searchable(uid, username, path):
|
|
"""
|
|
Check if passed directory is searchable by uid
|
|
"""
|
|
if "VIRTINST_TEST_SUITE" in os.environ:
|
|
return True
|
|
|
|
try:
|
|
statinfo = os.stat(path)
|
|
except OSError:
|
|
return False
|
|
|
|
if uid == statinfo.st_uid:
|
|
flag = stat.S_IXUSR
|
|
elif uid == statinfo.st_gid:
|
|
flag = stat.S_IXGRP
|
|
else:
|
|
flag = stat.S_IXOTH
|
|
|
|
if bool(statinfo.st_mode & flag):
|
|
return True
|
|
|
|
# Check POSIX ACL (since that is what we use to 'fix' access)
|
|
cmd = ["getfacl", path]
|
|
try:
|
|
proc = subprocess.Popen(cmd,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
out, err = proc.communicate()
|
|
except OSError:
|
|
logging.debug("Didn't find the getfacl command.")
|
|
return False
|
|
|
|
if proc.returncode != 0:
|
|
logging.debug("Cmd '%s' failed: %s", cmd, err)
|
|
return False
|
|
|
|
return bool(re.search("user:%s:..x" % username, out))
|
|
|
|
|
|
class _DiskSeclabel(XMLBuilder):
|
|
"""
|
|
This is for disk source <seclabel>. It's similar to a domain
|
|
<seclabel> but has fewer options
|
|
"""
|
|
_XML_ROOT_NAME = "seclabel"
|
|
model = XMLProperty("./@model")
|
|
relabel = XMLProperty("./@relabel", is_yesno=True)
|
|
label = XMLProperty("./label")
|
|
|
|
|
|
class VirtualDisk(VirtualDevice):
|
|
virtual_device_type = VirtualDevice.VIRTUAL_DEV_DISK
|
|
|
|
DRIVER_NAME_PHY = "phy"
|
|
DRIVER_NAME_QEMU = "qemu"
|
|
DRIVER_TYPE_RAW = "raw"
|
|
|
|
CACHE_MODE_NONE = "none"
|
|
CACHE_MODE_WRITETHROUGH = "writethrough"
|
|
CACHE_MODE_WRITEBACK = "writeback"
|
|
CACHE_MODE_DIRECTSYNC = "directsync"
|
|
CACHE_MODE_UNSAFE = "unsafe"
|
|
cache_types = [CACHE_MODE_NONE, CACHE_MODE_WRITETHROUGH,
|
|
CACHE_MODE_WRITEBACK, CACHE_MODE_DIRECTSYNC, CACHE_MODE_UNSAFE]
|
|
|
|
DISCARD_MODE_IGNORE = "ignore"
|
|
DISCARD_MODE_UNMAP = "unmap"
|
|
discard_types = [DISCARD_MODE_IGNORE, DISCARD_MODE_UNMAP]
|
|
|
|
DEVICE_DISK = "disk"
|
|
DEVICE_LUN = "lun"
|
|
DEVICE_CDROM = "cdrom"
|
|
DEVICE_FLOPPY = "floppy"
|
|
devices = [DEVICE_DISK, DEVICE_LUN, DEVICE_CDROM, DEVICE_FLOPPY]
|
|
|
|
TYPE_FILE = "file"
|
|
TYPE_BLOCK = "block"
|
|
TYPE_DIR = "dir"
|
|
TYPE_VOLUME = "volume"
|
|
TYPE_NETWORK = "network"
|
|
types = [TYPE_FILE, TYPE_BLOCK, TYPE_DIR, TYPE_NETWORK]
|
|
|
|
IO_MODE_NATIVE = "native"
|
|
IO_MODE_THREADS = "threads"
|
|
io_modes = [IO_MODE_NATIVE, IO_MODE_THREADS]
|
|
|
|
error_policies = ["ignore", "stop", "enospace", "report"]
|
|
|
|
@staticmethod
|
|
def disk_type_to_xen_driver_name(disk_type):
|
|
"""
|
|
Convert a value of VirtualDisk.type to it's associated Xen
|
|
<driver name=/> property
|
|
"""
|
|
if disk_type == VirtualDisk.TYPE_BLOCK:
|
|
return "phy"
|
|
elif disk_type == VirtualDisk.TYPE_FILE:
|
|
return "file"
|
|
return "file"
|
|
|
|
@staticmethod
|
|
def pretty_disk_bus(bus):
|
|
if bus in ["ide", "sata", "scsi", "usb", "sd"]:
|
|
return bus.upper()
|
|
if bus in ["xen"]:
|
|
return bus.capitalize()
|
|
if bus == "virtio":
|
|
return "VirtIO"
|
|
return bus
|
|
|
|
@staticmethod
|
|
def path_definitely_exists(conn, path):
|
|
"""
|
|
Check if path exists.
|
|
|
|
return True if we are certain, False otherwise. Path may in fact
|
|
exist if we return False, but we can't exhaustively know in all
|
|
cases.
|
|
|
|
(In fact if cached storage volume data is out of date, the volume
|
|
may have disappeared behind our back, but that shouldn't have bad
|
|
effects in practice.)
|
|
"""
|
|
if path is None:
|
|
return False
|
|
|
|
try:
|
|
(vol, pool) = diskbackend.check_if_path_managed(conn, path)
|
|
ignore = pool
|
|
|
|
if vol:
|
|
return True
|
|
|
|
if not conn.is_remote():
|
|
return os.path.exists(path)
|
|
except:
|
|
pass
|
|
|
|
return False
|
|
|
|
@staticmethod
|
|
def check_path_search_for_user(conn, path, username):
|
|
"""
|
|
Check if the passed user has search permissions for all the
|
|
directories in the disk path.
|
|
|
|
@return: List of the directories the user cannot search, or empty list
|
|
@rtype : C{list}
|
|
"""
|
|
if path is None:
|
|
return []
|
|
if conn.is_remote():
|
|
return []
|
|
if username == "root":
|
|
return []
|
|
if diskbackend.path_is_url(path):
|
|
return []
|
|
|
|
try:
|
|
# Get UID for string name
|
|
uid = pwd.getpwnam(username)[2]
|
|
except Exception, e:
|
|
logging.debug("Error looking up username: %s", str(e))
|
|
return []
|
|
|
|
fixlist = []
|
|
|
|
if os.path.isdir(path):
|
|
dirname = path
|
|
base = "-"
|
|
else:
|
|
dirname, base = os.path.split(path)
|
|
|
|
while base:
|
|
if not _is_dir_searchable(uid, username, dirname):
|
|
fixlist.append(dirname)
|
|
|
|
dirname, base = os.path.split(dirname)
|
|
|
|
return fixlist
|
|
|
|
@staticmethod
|
|
def check_path_search(conn, path):
|
|
# Only works for qemu and DAC
|
|
if conn.is_remote() or not conn.is_qemu_system():
|
|
return None, []
|
|
|
|
from virtcli import CLIConfig
|
|
user = CLIConfig.default_qemu_user
|
|
try:
|
|
for secmodel in conn.caps.host.secmodels:
|
|
if secmodel.model != "dac":
|
|
continue
|
|
|
|
label = None
|
|
for baselabel in secmodel.baselabels:
|
|
if baselabel.type in ["qemu", "kvm"]:
|
|
label = baselabel.content
|
|
break
|
|
if not label:
|
|
continue
|
|
|
|
pwuid = pwd.getpwuid(
|
|
int(label.split(":")[0].replace("+", "")))
|
|
if pwuid:
|
|
user = pwuid[0]
|
|
except:
|
|
logging.debug("Exception grabbing qemu DAC user", exc_info=True)
|
|
return None, []
|
|
|
|
return user, VirtualDisk.check_path_search_for_user(conn, path, user)
|
|
|
|
@staticmethod
|
|
def fix_path_search_for_user(conn, path, username):
|
|
"""
|
|
Try to fix any permission problems found by check_path_search_for_user
|
|
|
|
@return: Return a dictionary of entries {broken path : error msg}
|
|
@rtype : C{dict}
|
|
"""
|
|
def fix_perms(dirname, useacl=True):
|
|
if useacl:
|
|
cmd = ["setfacl", "--modify", "user:%s:x" % username, dirname]
|
|
proc = subprocess.Popen(cmd,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE)
|
|
out, err = proc.communicate()
|
|
|
|
logging.debug("Ran command '%s'", cmd)
|
|
if out or err:
|
|
logging.debug("out=%s\nerr=%s", out, err)
|
|
|
|
if proc.returncode != 0:
|
|
raise ValueError(err)
|
|
else:
|
|
logging.debug("Setting +x on %s", dirname)
|
|
mode = os.stat(dirname).st_mode
|
|
newmode = mode | stat.S_IXOTH
|
|
os.chmod(dirname, newmode)
|
|
if os.stat(dirname).st_mode != newmode:
|
|
# Trying to change perms on vfat at least doesn't work
|
|
# but also doesn't seem to error. Try and detect that
|
|
raise ValueError(_("Permissions on '%s' did not stick") %
|
|
dirname)
|
|
|
|
fixlist = VirtualDisk.check_path_search_for_user(conn, path, username)
|
|
if not fixlist:
|
|
return []
|
|
|
|
fixlist.reverse()
|
|
errdict = {}
|
|
|
|
useacl = True
|
|
for dirname in fixlist:
|
|
try:
|
|
try:
|
|
fix_perms(dirname, useacl)
|
|
except:
|
|
# If acl fails, fall back to chmod and retry
|
|
if not useacl:
|
|
raise
|
|
useacl = False
|
|
|
|
logging.debug("setfacl failed, trying old fashioned way")
|
|
fix_perms(dirname, useacl)
|
|
except Exception, e:
|
|
errdict[dirname] = str(e)
|
|
|
|
return errdict
|
|
|
|
@staticmethod
|
|
def path_in_use_by(conn, path, shareable=False, read_only=False):
|
|
"""
|
|
Return a list of VM names that are using the passed path.
|
|
|
|
@param conn: virConnect to check VMs
|
|
@param path: Path to check for
|
|
@param shareable: Path we are checking is marked shareable, so
|
|
don't warn if it conflicts with another shareable source.
|
|
@param read_only: Path we are checking is marked read_only, so
|
|
don't warn if it conflicts with another read_only source.
|
|
"""
|
|
if not path:
|
|
return []
|
|
|
|
# Find all volumes that have 'path' somewhere in their backing chain
|
|
vols = []
|
|
volmap = dict((vol.backing_store, vol)
|
|
for vol in conn.fetch_all_vols() if vol.backing_store)
|
|
backpath = path
|
|
while backpath in volmap:
|
|
vol = volmap[backpath]
|
|
if vol in vols:
|
|
break
|
|
backpath = vol.target_path
|
|
vols.append(backpath)
|
|
|
|
ret = []
|
|
vms = conn.fetch_all_guests()
|
|
for vm in vms:
|
|
if not read_only:
|
|
if path in [vm.os.kernel, vm.os.initrd, vm.os.dtb]:
|
|
ret.append(vm.name)
|
|
continue
|
|
|
|
for disk in vm.get_devices("disk"):
|
|
if disk.path in vols and vm.name not in ret:
|
|
# VM uses the path indirectly via backing store
|
|
ret.append(vm.name)
|
|
break
|
|
|
|
if disk.path != path:
|
|
continue
|
|
|
|
if shareable and disk.shareable:
|
|
continue
|
|
if read_only and disk.read_only:
|
|
continue
|
|
|
|
ret.append(vm.name)
|
|
break
|
|
|
|
return ret
|
|
|
|
@staticmethod
|
|
def build_vol_install(conn, volname, poolobj, size, sparse,
|
|
fmt=None, backing_store=None, backing_format=None):
|
|
"""
|
|
Helper for building a StorageVolume instance to pass to VirtualDisk
|
|
for eventual storage creation.
|
|
|
|
:param volname: name of the volume to be created
|
|
:param size: size in bytes
|
|
"""
|
|
from .storage import StorageVolume
|
|
|
|
if size is None:
|
|
raise ValueError(_("Size must be specified for non "
|
|
"existent volume '%s'" % volname))
|
|
|
|
# This catches --disk /dev/idontexist,size=1 if /dev is unmanaged
|
|
if not poolobj:
|
|
raise RuntimeError(_("Don't know how to create storage for "
|
|
"path '%s'. Use libvirt APIs to manage the parent directory "
|
|
"as a pool first.") % volname)
|
|
|
|
logging.debug("Creating volume '%s' on pool '%s'",
|
|
volname, poolobj.name())
|
|
|
|
cap = (size * 1024 * 1024 * 1024)
|
|
if sparse:
|
|
alloc = 0
|
|
else:
|
|
alloc = cap
|
|
|
|
volinst = StorageVolume(conn)
|
|
volinst.pool = poolobj
|
|
volinst.name = volname
|
|
volinst.capacity = cap
|
|
volinst.allocation = alloc
|
|
volinst.backing_store = backing_store
|
|
volinst.backing_format = backing_format
|
|
|
|
if fmt:
|
|
if not volinst.supports_property("format"):
|
|
raise ValueError(_("Format attribute not supported for this "
|
|
"volume type"))
|
|
volinst.format = fmt
|
|
|
|
return volinst
|
|
|
|
@staticmethod
|
|
def num_to_target(num):
|
|
"""
|
|
Convert an index in range (1, 1024) to a disk /dev number
|
|
(like hda, hdb, hdaa, etc.)
|
|
"""
|
|
digits = []
|
|
for factor in range(0, 3):
|
|
amt = (num % (26 ** (factor + 1))) / (26 ** factor)
|
|
if amt == 0 and num >= (26 ** (factor + 1)):
|
|
amt = 26
|
|
num -= amt
|
|
digits.insert(0, amt)
|
|
|
|
seen_valid = False
|
|
gen_t = ""
|
|
for digit in digits:
|
|
if digit == 0:
|
|
if not seen_valid:
|
|
continue
|
|
digit = 1
|
|
|
|
seen_valid = True
|
|
gen_t += "%c" % (ord('a') + digit - 1)
|
|
|
|
return gen_t
|
|
|
|
|
|
@staticmethod
|
|
def target_to_num(tgt):
|
|
"""
|
|
Convert disk /dev number (like hda, hdb, hdaa, etc.) to an index
|
|
"""
|
|
num = 0
|
|
k = 0
|
|
if tgt[0] == 'x':
|
|
# This case is here for 'xvda'
|
|
tgt = tgt[1:]
|
|
for i, c in enumerate(reversed(tgt[2:])):
|
|
if i != 0:
|
|
k = 1
|
|
num += (ord(c) - ord('a') + k) * (26 ** i)
|
|
return num
|
|
|
|
|
|
_XML_PROP_ORDER = [
|
|
"type", "device",
|
|
"driver_name", "driver_type",
|
|
"driver_cache", "driver_discard", "driver_io", "error_policy",
|
|
"_source_file", "_source_dev", "_source_dir",
|
|
"source_volume", "source_pool", "source_protocol", "source_name",
|
|
"source_host_name", "source_host_port",
|
|
"source_host_transport", "source_host_socket",
|
|
"target", "bus",
|
|
]
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
VirtualDevice.__init__(self, *args, **kwargs)
|
|
|
|
self._storage_backend = None
|
|
self.storage_was_created = False
|
|
|
|
|
|
#############################
|
|
# Public property-esque API #
|
|
#############################
|
|
|
|
def _get_path(self):
|
|
if not self._storage_backend:
|
|
xmlpath = self._get_xmlpath()
|
|
if xmlpath:
|
|
return xmlpath
|
|
|
|
self._set_default_storage_backend()
|
|
return self._storage_backend.get_path()
|
|
def _set_path(self, newpath):
|
|
if (self._storage_backend and
|
|
self._storage_backend.will_create_storage()):
|
|
raise ValueError(_("Can't change disk path if storage creation info "
|
|
"has been set."))
|
|
|
|
# User explicitly changed 'path', so try to lookup its storage
|
|
# object since we may need it
|
|
(vol_object, parent_pool) = diskbackend.manage_path(self.conn, newpath)
|
|
|
|
self._change_backend(newpath, vol_object, parent_pool)
|
|
self._set_xmlpath(self.path)
|
|
path = property(_get_path, _set_path)
|
|
|
|
def set_vol_object(self, vol_object, parent_pool):
|
|
logging.debug("disk.set_vol_object: volxml=\n%s",
|
|
vol_object.XMLDesc(0))
|
|
logging.debug("disk.set_vol_object: poolxml=\n%s",
|
|
parent_pool.XMLDesc(0))
|
|
self._change_backend(None, vol_object, parent_pool)
|
|
self._set_xmlpath(self.path)
|
|
|
|
def set_vol_install(self, vol_install):
|
|
logging.debug("disk.set_vol_install: name=%s poolxml=\n%s",
|
|
vol_install.name, vol_install.pool.XMLDesc(0))
|
|
self._storage_backend = diskbackend.ManagedStorageCreator(
|
|
self.conn, vol_install)
|
|
self._set_xmlpath(self.path)
|
|
|
|
def get_vol_object(self):
|
|
return self._storage_backend.get_vol_object()
|
|
def get_vol_install(self):
|
|
return self._storage_backend.get_vol_install()
|
|
def get_parent_pool(self):
|
|
if self.get_vol_install():
|
|
return self.get_vol_install().pool
|
|
return self._storage_backend.get_parent_pool()
|
|
|
|
def get_size(self):
|
|
return self._storage_backend.get_size()
|
|
|
|
|
|
#############################
|
|
# Internal defaults helpers #
|
|
#############################
|
|
|
|
def _get_default_driver_name(self):
|
|
if not self.path:
|
|
return None
|
|
|
|
# Recommended xen defaults from here:
|
|
# https://bugzilla.redhat.com/show_bug.cgi?id=1171550#c9
|
|
# If type block, use name=phy. Otherwise do the same as qemu
|
|
if self.conn.is_xen() and self.type == self.TYPE_BLOCK:
|
|
return self.DRIVER_NAME_PHY
|
|
if self.conn.check_support(
|
|
self.conn.SUPPORT_CONN_DISK_DRIVER_NAME_QEMU):
|
|
return self.DRIVER_NAME_QEMU
|
|
return None
|
|
|
|
def _get_default_driver_type(self):
|
|
"""
|
|
Set driver type from passed parameters
|
|
|
|
Where possible, we want to force /driver/@type = "raw" if installing
|
|
a QEMU VM. Without telling QEMU to expect a raw file, the emulator
|
|
is forced to autodetect, which has security implications:
|
|
|
|
http://lists.gnu.org/archive/html/qemu-devel/2008-04/msg00675.html
|
|
"""
|
|
if self.driver_name != self.DRIVER_NAME_QEMU:
|
|
return None
|
|
|
|
drvtype = self._storage_backend.get_driver_type()
|
|
return _qemu_sanitize_drvtype(self.type, drvtype)
|
|
|
|
|
|
#############################
|
|
# XML source media handling #
|
|
#############################
|
|
|
|
_source_file = XMLProperty("./source/@file")
|
|
_source_dev = XMLProperty("./source/@dev")
|
|
_source_dir = XMLProperty("./source/@dir")
|
|
|
|
source_pool = XMLProperty("./source/@pool")
|
|
source_volume = XMLProperty("./source/@volume")
|
|
|
|
source_name = XMLProperty("./source/@name")
|
|
source_protocol = XMLProperty("./source/@protocol")
|
|
# Technically multiple host lines can be listed
|
|
source_host_name = XMLProperty("./source/host/@name")
|
|
source_host_port = XMLProperty("./source/host/@port", is_int=True)
|
|
source_host_transport = XMLProperty("./source/host/@transport")
|
|
source_host_socket = XMLProperty("./source/host/@socket")
|
|
|
|
def _set_source_network_from_url(self, uri):
|
|
from .uri import URI
|
|
uriobj = URI(uri)
|
|
|
|
if uriobj.scheme:
|
|
self.source_protocol = uriobj.scheme
|
|
if uriobj.transport:
|
|
self.source_host_transport = uriobj.transport
|
|
if uriobj.hostname:
|
|
self.source_host_name = uriobj.hostname
|
|
if uriobj.port:
|
|
self.source_host_port = uriobj.port
|
|
if uriobj.path:
|
|
if self.source_host_transport:
|
|
self.source_host_socket = uriobj.path
|
|
else:
|
|
self.source_name = uriobj.path
|
|
if self.source_name.startswith("/"):
|
|
self.source_name = self.source_name[1:]
|
|
|
|
def _set_source_network_from_storage(self, volxml, poolxml):
|
|
self.source_protocol = poolxml.type
|
|
if poolxml.hosts:
|
|
self.source_host_name = poolxml.hosts[0].name
|
|
self.source_host_port = poolxml.hosts[0].port
|
|
|
|
path = ""
|
|
if poolxml.source_name:
|
|
path += poolxml.source_name
|
|
if poolxml.source_path:
|
|
path += poolxml.source_path
|
|
if not path.endswith('/'):
|
|
path += "/"
|
|
path += volxml.name
|
|
self.source_name = path
|
|
self.type = "network"
|
|
|
|
def _set_network_source_from_backend(self):
|
|
if (self._storage_backend.get_vol_object() or
|
|
self._storage_backend.get_vol_install()):
|
|
volxml = self._storage_backend.get_vol_xml()
|
|
poolxml = self._storage_backend.get_parent_pool_xml()
|
|
self._set_source_network_from_storage(volxml, poolxml)
|
|
elif self._storage_backend.get_path():
|
|
self._set_source_network_from_url(self._storage_backend.get_path())
|
|
|
|
def _build_url_from_network_source(self):
|
|
ret = self.source_protocol
|
|
if self.source_host_transport:
|
|
ret += "+%s" % self.source_host_transport
|
|
ret += "://"
|
|
if self.source_host_name:
|
|
ret += self.source_host_name
|
|
if self.source_host_port:
|
|
ret += ":" + str(self.source_host_port)
|
|
if self.source_name:
|
|
if not self.source_name.startswith("/"):
|
|
ret += "/"
|
|
ret += self.source_name
|
|
elif self.source_host_socket:
|
|
if not self.source_host_socket.startswith("/"):
|
|
ret += "/"
|
|
ret += self.source_host_socket
|
|
return ret
|
|
|
|
def _get_default_type(self):
|
|
if self.source_pool or self.source_volume:
|
|
return VirtualDisk.TYPE_VOLUME
|
|
if self._storage_backend:
|
|
return self._storage_backend.get_dev_type()
|
|
if self.source_protocol:
|
|
return VirtualDisk.TYPE_NETWORK
|
|
return self.TYPE_FILE
|
|
type = XMLProperty("./@type", default_cb=_get_default_type)
|
|
|
|
def _clear_source_xml(self):
|
|
"""
|
|
Unset all XML properties that describe the actual source media
|
|
"""
|
|
self._source_file = None
|
|
self._source_dev = None
|
|
self._source_dir = None
|
|
self.source_volume = None
|
|
self.source_pool = None
|
|
self.source_name = None
|
|
self.source_protocol = None
|
|
self.source_host_name = None
|
|
self.source_host_port = None
|
|
self.source_host_transport = None
|
|
self.source_host_socket = None
|
|
|
|
def _disk_type_to_object_prop_name(self):
|
|
disk_type = self.type
|
|
if disk_type == VirtualDisk.TYPE_BLOCK:
|
|
return "_source_dev"
|
|
elif disk_type == VirtualDisk.TYPE_DIR:
|
|
return "_source_dir"
|
|
elif disk_type == VirtualDisk.TYPE_FILE:
|
|
return "_source_file"
|
|
return None
|
|
|
|
|
|
# _xmlpath is an abstraction for source file/block/dir paths, since
|
|
# they don't have any special properties aside from needing to match
|
|
# 'type' value with the source property used.
|
|
def _get_xmlpath(self):
|
|
if self._source_file:
|
|
return self._source_file
|
|
if self._source_dev:
|
|
return self._source_dev
|
|
if self._source_dir:
|
|
return self._source_dir
|
|
return None
|
|
def _set_xmlpath(self, val):
|
|
self._clear_source_xml()
|
|
|
|
if self._storage_backend.get_dev_type() == "network":
|
|
self._set_network_source_from_backend()
|
|
return
|
|
|
|
propname = self._disk_type_to_object_prop_name()
|
|
if not propname:
|
|
return
|
|
return setattr(self, propname, val)
|
|
|
|
|
|
##################
|
|
# XML properties #
|
|
##################
|
|
|
|
device = XMLProperty("./@device",
|
|
default_cb=lambda s: s.DEVICE_DISK)
|
|
driver_name = XMLProperty("./driver/@name",
|
|
default_cb=_get_default_driver_name)
|
|
driver_type = XMLProperty("./driver/@type",
|
|
default_cb=_get_default_driver_type)
|
|
|
|
sgio = XMLProperty("./@sgio")
|
|
|
|
bus = XMLProperty("./target/@bus")
|
|
target = XMLProperty("./target/@dev")
|
|
removable = XMLProperty("./target/@removable", is_onoff=True)
|
|
|
|
read_only = XMLProperty("./readonly", is_bool=True)
|
|
shareable = XMLProperty("./shareable", is_bool=True)
|
|
driver_cache = XMLProperty("./driver/@cache")
|
|
driver_discard = XMLProperty("./driver/@discard")
|
|
driver_io = XMLProperty("./driver/@io")
|
|
|
|
error_policy = XMLProperty("./driver/@error_policy")
|
|
serial = XMLProperty("./serial")
|
|
startup_policy = XMLProperty("./source/@startupPolicy")
|
|
|
|
iotune_rbs = XMLProperty("./iotune/read_bytes_sec", is_int=True)
|
|
iotune_ris = XMLProperty("./iotune/read_iops_sec", is_int=True)
|
|
iotune_tbs = XMLProperty("./iotune/total_bytes_sec", is_int=True)
|
|
iotune_tis = XMLProperty("./iotune/total_iops_sec", is_int=True)
|
|
iotune_wbs = XMLProperty("./iotune/write_bytes_sec", is_int=True)
|
|
iotune_wis = XMLProperty("./iotune/write_iops_sec", is_int=True)
|
|
|
|
seclabels = XMLChildProperty(_DiskSeclabel, relative_xpath="./source")
|
|
def add_seclabel(self):
|
|
obj = _DiskSeclabel(self.conn)
|
|
self.add_child(obj)
|
|
return obj
|
|
|
|
|
|
#################################
|
|
# Validation assistance methods #
|
|
#################################
|
|
|
|
def _set_default_storage_backend(self):
|
|
path = None
|
|
vol_object = None
|
|
parent_pool = None
|
|
typ = self._get_default_type()
|
|
|
|
if self.type == VirtualDisk.TYPE_NETWORK:
|
|
# Fill in a completed URL for virt-manager UI, path comparison, etc
|
|
path = self._build_url_from_network_source()
|
|
|
|
if typ == VirtualDisk.TYPE_VOLUME:
|
|
conn = self.conn
|
|
if "weakref" in str(type(conn)):
|
|
conn = conn()
|
|
|
|
try:
|
|
parent_pool = conn.storagePoolLookupByName(self.source_pool)
|
|
vol_object = parent_pool.storageVolLookupByName(
|
|
self.source_volume)
|
|
except:
|
|
logging.debug("Error fetching source pool=%s vol=%s",
|
|
self.source_pool, self.source_volume, exc_info=True)
|
|
|
|
if vol_object is None and path is None:
|
|
path = self._get_xmlpath()
|
|
|
|
self._change_backend(path, vol_object, parent_pool)
|
|
|
|
def set_local_disk_to_clone(self, disk, sparse):
|
|
"""
|
|
Set a path to manually clone (as in, not through libvirt)
|
|
"""
|
|
self._storage_backend = diskbackend.CloneStorageCreator(self.conn,
|
|
self.path, disk.path, disk.get_size(), sparse)
|
|
|
|
def is_cdrom(self):
|
|
return self.device == self.DEVICE_CDROM
|
|
def is_floppy(self):
|
|
return self.device == self.DEVICE_FLOPPY
|
|
def is_disk(self):
|
|
return self.device == self.DEVICE_DISK
|
|
|
|
def can_be_empty(self):
|
|
return self.is_floppy() or self.is_cdrom()
|
|
|
|
def _change_backend(self, path, vol_object, parent_pool):
|
|
backend = diskbackend.StorageBackend(self.conn, path,
|
|
vol_object, parent_pool)
|
|
self._storage_backend = backend
|
|
|
|
def sync_path_props(self):
|
|
"""
|
|
Fills in the values of type, driver_type, and driver_name for
|
|
the associated backing storage. This needs to be manually called
|
|
if changing an existing disk's media.
|
|
"""
|
|
path = self._get_xmlpath()
|
|
|
|
self.type = self._get_default_type()
|
|
self.driver_name = self._get_default_driver_name()
|
|
self.driver_type = self._get_default_driver_type()
|
|
|
|
# Need to retrigger this if self.type changed
|
|
if path:
|
|
self._set_xmlpath(path)
|
|
|
|
def wants_storage_creation(self):
|
|
"""
|
|
If true, this disk needs storage creation parameters or things
|
|
will error.
|
|
"""
|
|
return (self._storage_backend and
|
|
not self._storage_backend.exists())
|
|
|
|
def validate(self):
|
|
if self.path is None:
|
|
if not self.can_be_empty():
|
|
raise ValueError(_("Device type '%s' requires a path") %
|
|
self.device)
|
|
|
|
return
|
|
|
|
if (self.type == VirtualDisk.TYPE_DIR and
|
|
not self.is_floppy()):
|
|
raise ValueError(_("The path '%s' must be a file or a "
|
|
"device, not a directory") % self.path)
|
|
|
|
if not self._storage_backend:
|
|
return
|
|
|
|
if (not self._storage_backend.will_create_storage() and
|
|
not self._storage_backend.exists()):
|
|
raise ValueError(
|
|
_("Must specify storage creation parameters for "
|
|
"non-existent path '%s'.") % self.path)
|
|
|
|
self._storage_backend.validate(self)
|
|
|
|
def setup(self, meter=None):
|
|
"""
|
|
Build storage (if required)
|
|
|
|
If storage doesn't exist (a non-existent file 'path', or 'vol_install'
|
|
was specified), we create it.
|
|
"""
|
|
if not self._storage_backend.will_create_storage():
|
|
return
|
|
|
|
meter = util.ensure_meter(meter)
|
|
vol_object = self._storage_backend.create(meter)
|
|
self.storage_was_created = True
|
|
if not vol_object:
|
|
return
|
|
|
|
parent_pool = self.get_vol_install().pool
|
|
self._change_backend(None, vol_object, parent_pool)
|
|
|
|
def set_defaults(self, guest):
|
|
if self.is_cdrom():
|
|
self.read_only = True
|
|
|
|
if self.is_cdrom() and guest.os.is_s390x():
|
|
self.bus = "scsi"
|
|
|
|
if not self.conn.is_qemu():
|
|
return
|
|
if not self.is_disk():
|
|
return
|
|
if not self.type == self.TYPE_BLOCK:
|
|
return
|
|
|
|
# Enable cache=none and io=native for block devices. Would
|
|
# be nice if qemu did this for us but that time has long passed.
|
|
if not self.driver_cache:
|
|
self.driver_cache = self.CACHE_MODE_NONE
|
|
if not self.driver_io:
|
|
self.driver_io = self.IO_MODE_NATIVE
|
|
|
|
|
|
def is_size_conflict(self):
|
|
"""
|
|
reports if disk size conflicts with available space
|
|
|
|
returns a two element tuple:
|
|
1. first element is True if fatal conflict occurs
|
|
2. second element is a string description of the conflict or None
|
|
Non fatal conflicts (sparse disk exceeds available space) will
|
|
return (False, "description of collision")
|
|
"""
|
|
return self._storage_backend.is_size_conflict()
|
|
|
|
def is_conflict_disk(self, conn=None):
|
|
"""
|
|
check if specified storage is in use by any other VMs on passed
|
|
connection.
|
|
|
|
@return: list of colliding VM names
|
|
@rtype: C{list}
|
|
"""
|
|
if not self.path:
|
|
return False
|
|
if not conn:
|
|
conn = self.conn
|
|
|
|
ret = self.path_in_use_by(conn, self.path,
|
|
shareable=self.shareable,
|
|
read_only=self.read_only)
|
|
return ret
|
|
|
|
|
|
def get_target_prefix(self, used_targets=None):
|
|
"""
|
|
Returns the suggested disk target prefix (hd, xvd, sd ...) for the
|
|
disk.
|
|
@returns: str prefix, or None if no reasonable guess can be made
|
|
"""
|
|
# The upper limits here aren't necessarilly 1024, but let the HV
|
|
# error as appropriate.
|
|
def _return(prefix):
|
|
nummap = {
|
|
"vd": 1024,
|
|
"xvd": 1024,
|
|
"fd": 2,
|
|
"hd": 4,
|
|
"sd": 1024,
|
|
}
|
|
return prefix, nummap[prefix]
|
|
|
|
if self.bus == "virtio":
|
|
return _return("vd")
|
|
elif self.bus == "xen":
|
|
return _return("xvd")
|
|
elif self.bus == "fdc" or self.is_floppy():
|
|
return _return("fd")
|
|
elif self.bus == "ide":
|
|
return _return("hd")
|
|
elif self.bus or not used_targets:
|
|
# sata, scsi, usb, sd
|
|
return _return("sd")
|
|
|
|
# If guest already has some disks defined
|
|
preforder = ["vd", "xvd", "sd", "hd"]
|
|
for pref in preforder:
|
|
for target in used_targets:
|
|
if target.startswith(pref):
|
|
return _return(pref)
|
|
return _return("sd")
|
|
|
|
def generate_target(self, skip_targets, pref_ctrl=None):
|
|
"""
|
|
Generate target device ('hda', 'sdb', etc..) for disk, excluding
|
|
any targets in 'skip_targets'. If given the 'pref_ctrl'
|
|
parameter, it tries to select the target so that the disk is
|
|
mapped onto that controller.
|
|
Sets self.target, and returns the generated value.
|
|
|
|
@param skip_targets: list of targets to exclude
|
|
@type skip_targets: C{list}
|
|
@param pref_ctrl: preferred controller to connect the disk to
|
|
@type pref_ctrl: C{int}
|
|
@raise ValueError: can't determine target type, no targets available
|
|
@returns generated target
|
|
@rtype C{str}
|
|
"""
|
|
prefix, maxnode = self.get_target_prefix(skip_targets)
|
|
skip_targets = [t for t in skip_targets if t and t.startswith(prefix)]
|
|
skip_targets.sort()
|
|
|
|
def get_target():
|
|
first_found = None
|
|
|
|
ran = range(maxnode)
|
|
if pref_ctrl is not None:
|
|
# We assume narrow SCSI bus and libvirt assigning 7
|
|
# (1-7, 8-14, etc.) devices per controller
|
|
ran = range(pref_ctrl * 7, (pref_ctrl + 1) * 7)
|
|
|
|
for i in ran:
|
|
gen_t = prefix + self.num_to_target(i + 1)
|
|
if gen_t in skip_targets:
|
|
skip_targets.remove(gen_t)
|
|
continue
|
|
if not skip_targets:
|
|
return gen_t
|
|
elif not first_found:
|
|
first_found = gen_t
|
|
if first_found:
|
|
return first_found
|
|
|
|
ret = get_target()
|
|
if ret:
|
|
self.target = ret
|
|
return ret
|
|
|
|
if pref_ctrl is not None:
|
|
# This basically means that we either chose full
|
|
# controller or didn't add any
|
|
raise ValueError(_("Controller number %d for disk of type %s has "
|
|
"no empty slot to use" % (pref_ctrl, prefix)))
|
|
else:
|
|
raise ValueError(_("Only %s disks of type '%s' are supported"
|
|
% (maxnode, prefix)))
|
|
|
|
VirtualDisk.register_type()
|