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virt-manager/virtinst/support.py
Cole Robinson ee7d0b620d connection: Support listAll* object lookups 
These calls save us a few API lookups, but are not supported by all
libvirt versions.

Since these bits were getting quite large, move them all to a separate
pollhelpers file.

However listAllInterfaces is returning an empty list for now, so we
disable the check: https://bugzilla.redhat.com/show_bug.cgi?id=982014
2013-07-07 15:06:09 -04:00

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#
# Helper functions for determining if libvirt supports certain features
#
# Copyright 2009 Red Hat, Inc.
# Cole Robinson <crobinso@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 libvirt
from virtinst import util
# Flags for check_conn_support
(SUPPORT_CONN_STORAGE,
SUPPORT_CONN_FINDPOOLSOURCES,
SUPPORT_CONN_NODEDEV,
SUPPORT_CONN_KEYMAP_AUTODETECT,
SUPPORT_CONN_GETHOSTNAME,
SUPPORT_CONN_DOMAIN_VIDEO,
SUPPORT_CONN_NETWORK,
SUPPORT_CONN_INTERFACE,
SUPPORT_CONN_MAXVCPUS_XML,
SUPPORT_CONN_STREAM,
SUPPORT_CONN_GETVERSION,
SUPPORT_CONN_LIBVERSION,
SUPPORT_CONN_LISTALLDOMAINS,
SUPPORT_CONN_LISTALLNETWORKS,
SUPPORT_CONN_LISTALLSTORAGEPOOLS,
SUPPORT_CONN_LISTALLINTERFACES) = range(1, 17)
# Flags for check_domain_support
(SUPPORT_DOMAIN_GETVCPUS,
SUPPORT_DOMAIN_XML_SECURE,
SUPPORT_DOMAIN_XML_INACTIVE,
SUPPORT_DOMAIN_MANAGED_SAVE,
SUPPORT_DOMAIN_MIGRATE_DOWNTIME,
SUPPORT_DOMAIN_JOB_INFO,
SUPPORT_DOMAIN_MAXVCPUS_XML,
SUPPORT_DOMAIN_CONSOLE_STREAM,
SUPPORT_DOMAIN_SET_METADATA,
SUPPORT_DOMAIN_CPU_HOST_MODEL) = range(1000, 1010)
# Flags for check_pool_support
(SUPPORT_STORAGE_CREATEVOLFROM,
SUPPORT_STORAGE_UPLOAD,
SUPPORT_STORAGE_ISACTIVE) = range(2000, 2003)
# Flags for check_nodedev_support
(SUPPORT_NODEDEV_PCI_DETACH,) = range(3000, 3001)
# Flags for check_interface_support
(SUPPORT_INTERFACE_XML_INACTIVE,
SUPPORT_INTERFACE_ISACTIVE) = range(4000, 4002)
# Flags for check_conn_hv_support
(SUPPORT_CONN_HV_VIRTIO,
SUPPORT_CONN_HV_SKIP_DEFAULT_ACPI,
SUPPORT_CONN_HV_SOUND_AC97,
SUPPORT_CONN_HV_SOUND_ICH6,
SUPPORT_CONN_HV_GRAPHICS_SPICE,
SUPPORT_CONN_HV_CHAR_SPICEVMC,
SUPPORT_CONN_HV_DIRECT_INTERFACE,
SUPPORT_CONN_HV_FILESYSTEM) = range(5000, 5008)
# Flags for check_stream_support
(SUPPORT_STREAM_UPLOAD,) = range(6000, 6001)
# Flags for check_net_support
(SUPPORT_NET_ISACTIVE,) = range(7000, 7001)
# Possible keys:
#
# "version" : Minimum libvirt version required for this feature. Not used
# if 'args' provided
#
# "force_version" : Demand that version check is met for the checked
# libvirt version. Normally we will make a best effort
# attempt, because determining the daemon version depends
# on an api call from 2010. So for things like
# testing API availability (e.g. createXMLFrom) we won't
# force the check, but for things like XML options (AC97)
# we want to be ABSOLUTELY SURE it is supported so we
# don't enable it by default and break guest creation.
# This isn't required for versions after >= 0.7.3
#
# "function" : Function name to check exists. If object not specified,
# function is checked against libvirt module.
#
# "args": Argument tuple to actually test object.function with.
#
# "flag": A flag to check exists. This will be appended to the argument
# list if args are provided, otherwise we will only check against
# the local libvirt version.
#
# "drv_version" : A list of tuples of the form
# (driver name (e.g qemu, xen, lxc), minimum supported version)
# If a hypervisor is not listed, it is assumed to be NOT
# SUPPORTED.
#
# "drv_libvirt_version" : List of tuples, similar to drv_version, but
# the version number is minimum supported _libvirt_
# version
# "hv_version" : A list of tuples of the same form as drv_version, however
# listing the actual <domain type='%s'/> from the XML.
# example: 'kvm'
_support_dict = {
SUPPORT_CONN_STORAGE : {
"function" : "virConnect.listStoragePools",
"args" : (),
},
SUPPORT_CONN_NODEDEV : {
"function" : "virConnect.listDevices",
"args" : (None, 0),
},
SUPPORT_CONN_FINDPOOLSOURCES : {
"function" : "virConnect.findStoragePoolSources",
},
SUPPORT_CONN_KEYMAP_AUTODETECT : {
"drv_version" : [("qemu", 11000)],
},
SUPPORT_CONN_GETHOSTNAME : {
"function" : "virConnect.getHostname()",
"args" : (),
},
SUPPORT_CONN_DOMAIN_VIDEO : {
"version" : 6005,
},
SUPPORT_CONN_NETWORK : {
"function" : "virConnect.listNetworks",
"args" : (),
},
SUPPORT_CONN_INTERFACE : {
"function" : "virConnect.listInterfaces",
"args" : (),
},
SUPPORT_CONN_MAXVCPUS_XML : {
"version" : 8005,
},
SUPPORT_CONN_STREAM : {
# Earliest version with working bindings
"version" : 9003,
"function" : "virConnect.newStream",
"args" : (0,),
},
SUPPORT_CONN_GETVERSION : {
"function": "virConnect.getVersion",
"args": (),
},
SUPPORT_CONN_LIBVERSION : {
"function": "virConnect.getLibVersion",
"args": (),
},
SUPPORT_CONN_LISTALLDOMAINS : {
"function": "virConnect.listAllDomains",
"args": (),
},
SUPPORT_CONN_LISTALLNETWORKS : {
"function": "virConnect.listAllNetworks",
"args": (),
},
SUPPORT_CONN_LISTALLSTORAGEPOOLS : {
"function": "virConnect.listAllStoragePools",
"args": (),
},
SUPPORT_CONN_LISTALLINTERFACES : {
"function": "virConnect.listAllInterfaces",
"args": (),
},
#################
# Domain checks #
#################
SUPPORT_DOMAIN_GETVCPUS : {
"function" : "virDomain.vcpus",
"args" : (),
},
SUPPORT_DOMAIN_XML_INACTIVE : {
"function" : "virDomain.XMLDesc",
"args" : (),
"flag" : "VIR_DOMAIN_XML_INACTIVE",
},
SUPPORT_DOMAIN_XML_SECURE : {
"function" : "virDomain.XMLDesc",
"args" : (),
"flag" : "VIR_DOMAIN_XML_SECURE",
},
SUPPORT_DOMAIN_MANAGED_SAVE : {
"function" : "virDomain.hasManagedSaveImage",
"args" : (0,),
},
SUPPORT_DOMAIN_MIGRATE_DOWNTIME : {
"function" : "virDomain.migrateSetMaxDowntime",
# Use a bogus flags value, so that we don't overwrite existing
# downtime value
"args" : (30, 12345678),
},
SUPPORT_DOMAIN_JOB_INFO : {
"function" : "virDomain.jobInfo",
"args" : (),
},
SUPPORT_DOMAIN_CONSOLE_STREAM : {
"version" : 9003,
},
SUPPORT_DOMAIN_SET_METADATA : {
"version" : 9010,
},
SUPPORT_DOMAIN_CPU_HOST_MODEL : {
"version" : 9010,
},
###############
# Pool checks #
###############
# This can't ever require a pool object for back compat reasons
SUPPORT_STORAGE_CREATEVOLFROM : {
"function" : "virStoragePool.createXMLFrom",
"version" : 6004,
},
SUPPORT_STORAGE_ISACTIVE : {
"function" : "virStoragePool.isActive",
"args": (),
},
##################
# Nodedev checks #
##################
# This can't ever require a nodedev object for back compat reasons
SUPPORT_NODEDEV_PCI_DETACH : {
"function" : "virNodeDevice.dettach",
"version" : 6001,
},
####################
# Interface checks #
####################
SUPPORT_INTERFACE_XML_INACTIVE : {
"function" : "virInterface.XMLDesc",
"args" : (),
"flag" : "VIR_INTERFACE_XML_INACTIVE",
},
SUPPORT_INTERFACE_ISACTIVE : {
"function" : "virInterface.isActive",
"args": (),
},
##################
# Conn HV checks #
##################
SUPPORT_CONN_HV_VIRTIO : {
"drv_version": [("qemu", 0)],
"hv_version" : [("kvm", 0)],
},
SUPPORT_CONN_HV_SKIP_DEFAULT_ACPI : {
"drv_version" : [("xen", -3001000)],
},
SUPPORT_CONN_HV_SOUND_AC97 : {
"version" : 6000,
"force_version" : True,
"drv_version" : [("qemu", 11000), ],
},
SUPPORT_CONN_HV_SOUND_ICH6 : {
"version" : 8008,
"drv_version" : [("qemu", 14000), ],
"rhel6_drv_version" : [("qemu", 12001)],
"rhel6_version" : 8007,
},
SUPPORT_CONN_HV_GRAPHICS_SPICE : {
"version" : 8006,
"drv_version" : [("qemu", 14000), ],
},
SUPPORT_CONN_HV_CHAR_SPICEVMC : {
"version" : 8008,
"drv_version" : [("qemu", 14000), ],
},
SUPPORT_CONN_HV_DIRECT_INTERFACE : {
"version" : 8007,
"drv_version" : [("qemu", 0), ],
},
SUPPORT_CONN_HV_FILESYSTEM : {
"drv_version" : [("qemu", 13000),
("lxc", 0),
("openvz", 0),
("test", 0)],
"drv_libvirt_version" : [("qemu", 8005),
("lxc", 0),
("openvz", 0),
("test", 0)],
},
#################
# Stream checks #
#################
SUPPORT_STREAM_UPLOAD : {
# Latest I tested with, and since we will use it by default
# for URL installs, want to be sure it works
"version" : 9004,
},
##################
# Network checks #
##################
SUPPORT_NET_ISACTIVE : {
"function" : "virNetwork.isActive",
"args": (),
},
}
# RHEL6 has lots of feature backports, and since libvirt doesn't
# really offer any XML feature introspection, we have to use hacks to
# make sure we aren't generating bogus config on non RHEL
_rhel6 = False
def set_rhel6(val):
global _rhel6
_rhel6 = bool(val)
def get_rhel6():
return _rhel6
# Check that command is present in the python bindings, and return the
# the requested function
def _get_command(funcname, objname=None, obj=None):
if not obj:
obj = libvirt
if objname:
if not hasattr(libvirt, objname):
return None
obj = getattr(libvirt, objname)
if not hasattr(obj, funcname):
return None
return getattr(obj, funcname)
# Make sure libvirt object 'objname' has function 'funcname'
def _has_command(funcname, objname=None, obj=None):
return bool(_get_command(funcname, objname, obj))
# Make sure libvirt object has flag 'flag_name'
def _get_flag(flag_name):
return _get_command(flag_name)
# Try to call the passed function, and look for signs that libvirt or driver
# doesn't support it
def _try_command(func, args, check_all_error=False):
try:
func(*args)
except libvirt.libvirtError, e:
if util.is_error_nosupport(e):
return False
if check_all_error:
return False
except Exception:
# Other python exceptions likely mean the bindings are horked
return False
return True
# Return the hypervisor version
def _split_function_name(function):
if not function:
return (None, None)
output = function.split(".")
if len(output) == 1:
return (None, output[0])
else:
return (output[0], output[1])
def check_support(virtconn, feature, data=None):
"""
Attempt to determine if a specific libvirt feature is support given
the passed connection.
@param conn: Libvirt connection to check feature on
@param feature: Feature type to check support for
@type feature: One of the SUPPORT_* flags
@param data: Option libvirt object to use in feature checking
@type data: Could be virDomain, virNetwork, virStoragePool,
hv name, etc
@returns: True if feature is supported, False otherwise
"""
if "VirtualConnection" in repr(data):
data = data.libvirtconn
support_info = _support_dict[feature]
key_list = support_info.keys()
def get_value(key):
if key in key_list:
key_list.remove(key)
return support_info.get(key)
is_rhel6 = get_rhel6()
force_version = get_value("force_version") or False
minimum_libvirt_version = get_value("version") or 0
rhel6_min = get_value("rhel6_version") or minimum_libvirt_version
if is_rhel6:
minimum_libvirt_version = rhel6_min
drv_version = get_value("drv_version") or []
rhel6_drv_version = get_value("rhel6_drv_version") or drv_version
if is_rhel6:
drv_version = rhel6_drv_version
drv_libvirt_version = get_value("drv_libvirt_version") or []
hv_version = get_value("hv_version") or []
object_name, function_name = _split_function_name(get_value("function"))
args = get_value("args")
flag = get_value("flag")
# Make sure there are no keys left in the key_list. This will
# ensure we didn't mistype anything above, or in the support_dict
if key_list:
raise RuntimeError("Unknown keys in the support_dict: %s" % key_list)
if function_name:
# Make sure function is present in either libvirt module or
# object_name class
flag_tuple = ()
if not _has_command(function_name, objname=object_name):
return False
if flag:
found_flag = _get_flag(flag)
if not bool(found_flag):
return False
flag_tuple = (found_flag,)
if args is not None:
classobj = None
# If function requires an object, make sure the passed obj
# is of the correct type
if object_name:
classobj = _get_command(object_name)
if not isinstance(data, classobj):
raise ValueError(
"Passed obj %s with args must be of type %s, was %s" %
(data, str(classobj), type(data)))
cmd = _get_command(function_name, obj=data)
# Function with args specified is all the proof we need
ret = _try_command(cmd, args + flag_tuple,
check_all_error=bool(flag_tuple))
return ret
# Do this after the function check, since there's an ordering issue
# with VirtualConnection
drv_type = virtconn.get_uri_driver()
actual_lib_ver = virtconn.local_libvirt_version()
actual_daemon_ver = virtconn.daemon_version()
actual_drv_ver = virtconn.conn_version()
if (actual_daemon_ver == 0 and not force_version):
# This means the API may not be supported, but we don't care
actual_daemon_ver = 1000000000
# Check that local libvirt version is sufficient
if minimum_libvirt_version > actual_lib_ver:
return False
# Check that daemon version is sufficient
if minimum_libvirt_version > actual_daemon_ver:
return False
# If driver specific version info specified, try to verify
if drv_version:
found = False
for drv, min_drv_ver in drv_version:
if drv != drv_type:
continue
if min_drv_ver < 0:
if actual_drv_ver <= -min_drv_ver:
found = True
break
else:
if actual_drv_ver >= min_drv_ver:
found = True
break
if not found:
return False
if drv_libvirt_version:
found = False
for drv, min_lib_ver in drv_libvirt_version:
if drv != drv_type:
continue
if min_lib_ver < 0:
if actual_lib_ver <= -min_lib_ver:
found = True
break
else:
if actual_lib_ver >= min_lib_ver:
found = True
break
if not found:
return False
if hv_version:
found = False
hv_type = data
for hv, min_hv_ver in hv_version:
if hv != hv_type:
continue
# No HV specific version info, just use driver version
if min_hv_ver < 0:
if actual_drv_ver <= -min_hv_ver:
found = True
break
else:
if actual_drv_ver >= min_hv_ver:
found = True
break
if not found:
return False
return True
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