mirror of
https://github.com/retspen/webvirtcloud
synced 2026-11-08 19:26:48 +00:00
9d22d48a85
The create page and the API's create take the architecture from the URL. One the host's capabilities do not list raised a KeyError in get_dom_cap_xml: an HTML 500 for both. It is now "This host has no architecture noarch": the page shows it, the API answers 400.
1251 lines
50 KiB
Python
1251 lines
50 KiB
Python
from django.utils.translation import gettext_noop
|
|
import contextlib
|
|
import io
|
|
import logging
|
|
import os
|
|
import threading
|
|
import time
|
|
import uuid
|
|
from urllib.parse import quote
|
|
|
|
import libvirt
|
|
from django.conf import settings
|
|
from django.core.signals import request_finished, request_started
|
|
from django.utils.functional import cached_property
|
|
from libvirt import libvirtError
|
|
from lxml import etree
|
|
from vrtManager import util
|
|
from vrtManager.rwlock import ReadWriteLock
|
|
|
|
CONN_SOCKET = 4
|
|
CONN_TLS = 3
|
|
CONN_SSH = 2
|
|
CONN_TCP = 1
|
|
|
|
# libvirt has no timeout for opening a connection: an unreachable host
|
|
# blocks for the kernel's TCP connect timeout (about 2 minutes), a daemon
|
|
# that accepts but never answers blocks forever, and such an open cannot be
|
|
# cancelled. Connections are opened in a helper thread, at most one per
|
|
# connection at a time, so a stuck host holds one thread and nothing else;
|
|
# the caller waits at most CONNECT_TIMEOUT seconds, and a host that failed is
|
|
# not tried again for RETRY_AFTER seconds.
|
|
CONNECT_TIMEOUT = getattr(settings, "LIBVIRT_CONNECT_TIMEOUT", 5)
|
|
RETRY_AFTER = getattr(settings, "LIBVIRT_RETRY_AFTER", 30)
|
|
# A call to a host that is up but stuck (a hung NFS mount, for one) waits as
|
|
# long as the host does: libvirt has no call timeout, and keepalive does not
|
|
# end it, since the daemon still answers keepalives. So in a process at most
|
|
# HOST_REQUESTS web requests use one host (by its name, whatever the login)
|
|
# at a time; another waits up to
|
|
# CONNECT_TIMEOUT for one of them to end, and is then refused. A request
|
|
# counts on the host it connected to last, until it ends. Threads outside a
|
|
# request (the job worker's, the consoles') are not counted: a job holds its
|
|
# host for as long as it runs.
|
|
HOST_REQUESTS = getattr(settings, "LIBVIRT_HOST_REQUESTS", 2)
|
|
# libvirt's close reasons, one whole message each
|
|
CLOSE_REASONS = {
|
|
0: gettext_noop("Connection closed (error)"),
|
|
1: gettext_noop("Connection closed (end of file)"),
|
|
2: gettext_noop("Connection closed (keepalive timeout)"),
|
|
3: gettext_noop("Connection closed (client closed)"),
|
|
}
|
|
# ssh with a connect timeout for qemu+ssh (libvirt runs the "command" binary
|
|
# in place of ssh and never passes one itself)
|
|
SSH_COMMAND = os.path.join(os.path.dirname(os.path.abspath(__file__)), "libvirt-ssh")
|
|
|
|
logger = logging.getLogger(__name__)
|
|
# libvirt prints each error on stderr without saying where it came from; every
|
|
# process that talks to libvirt imports this module. The errors are raised to
|
|
# the callers, which handle or report them.
|
|
libvirt.registerErrorHandler(lambda context, error: None, None)
|
|
|
|
|
|
class wvmEventLoop(threading.Thread):
|
|
""" Event Loop Class"""
|
|
|
|
def __init__(self, group=None, target=None, name=None, args=(), kwargs={}):
|
|
if name is None:
|
|
name = "libvirt event loop"
|
|
|
|
super(wvmEventLoop, self).__init__(group, target, name, args, kwargs)
|
|
|
|
# we run this thread in deamon mode, so it does
|
|
# not block shutdown of the server
|
|
self.daemon = True
|
|
|
|
def run(self):
|
|
while True:
|
|
# if this method will fail it raises libvirtError
|
|
# we do not catch the exception here so it will show up
|
|
# in the logs. Not sure when this call will ever fail
|
|
libvirt.virEventRunDefaultImpl()
|
|
|
|
|
|
# The event loop (keepalive, close callbacks) starts with the first connection
|
|
# of a process, not at import: novncd imports this module and then forks a child
|
|
# per console, and libvirt must not be used after a fork of a process with
|
|
# running libvirt threads. Threads do not survive a fork, so a child starts its
|
|
# own loop. This is process state, shared by all connection managers.
|
|
_event_loop = {"lock": threading.Lock(), "running": False, "registered": False}
|
|
|
|
|
|
def start_event_loop():
|
|
if _event_loop["running"]:
|
|
return
|
|
with _event_loop["lock"]:
|
|
if _event_loop["running"]:
|
|
return
|
|
if not _event_loop["registered"]:
|
|
# the registration is libvirt's process state and a child inherits it
|
|
libvirt.virEventRegisterDefaultImpl()
|
|
_event_loop["registered"] = True
|
|
wvmEventLoop().start()
|
|
_event_loop["running"] = True
|
|
|
|
|
|
def _after_fork_in_child():
|
|
# the loop thread and any thread holding these locks are gone
|
|
_event_loop["lock"] = threading.Lock()
|
|
_event_loop["running"] = False
|
|
connection_manager.forget_connections()
|
|
|
|
|
|
os.register_at_fork(after_in_child=_after_fork_in_child)
|
|
|
|
|
|
_request = threading.local() # in a web request: the connection it counts on (HOST_REQUESTS)
|
|
|
|
|
|
def _request_started(**kwargs):
|
|
_leave_host() # a request that ended without request_finished (an error outside Django's handling)
|
|
_request.active = True
|
|
|
|
|
|
def _request_finished(**kwargs):
|
|
_leave_host()
|
|
_request.active = False
|
|
|
|
|
|
def _leave_host():
|
|
held = getattr(_request, "held", None)
|
|
if held is not None:
|
|
_request.held = None
|
|
held.requests.release()
|
|
|
|
|
|
def _count_on(connection):
|
|
"""A web request uses the host of connection from now on (HOST_REQUESTS)."""
|
|
if not getattr(_request, "active", False) or getattr(_request, "held", None) is connection:
|
|
return
|
|
_leave_host()
|
|
if not connection.requests.acquire(timeout=CONNECT_TIMEOUT):
|
|
logger.warning("%s: request refused, %s requests still wait for the host", connection.host, HOST_REQUESTS)
|
|
raise util.HostBusy(gettext_noop("Connection Failed: %(host)s does not answer: %(requests)s requests still wait for it"),
|
|
host=connection.host, requests=HOST_REQUESTS)
|
|
_request.held = connection
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def other_hosts():
|
|
"""For code that reads other hosts in the middle of a web request, which
|
|
then goes on with the host it used before, through the objects it kept:
|
|
the request counts on that host again after the block (HOST_REQUESTS)."""
|
|
held = getattr(_request, "held", None)
|
|
try:
|
|
yield
|
|
finally:
|
|
if held is not None:
|
|
_count_on(held)
|
|
|
|
|
|
request_started.connect(_request_started, dispatch_uid="vrtManager.connection.request_started")
|
|
request_finished.connect(_request_finished, dispatch_uid="vrtManager.connection.request_finished")
|
|
|
|
|
|
# libvirt's per-host directory of the VMs' UEFI variables (NVRAM)
|
|
NVRAM_DIR = "/var/lib/libvirt/qemu/nvram"
|
|
|
|
|
|
class wvmConnection(object):
|
|
"""
|
|
class representing a single connection stored in the Connection Manager
|
|
"""
|
|
|
|
def __init__(self, host, login, passwd, conn):
|
|
"""
|
|
Sets all class attributes and tries to open the connection
|
|
"""
|
|
# connection lock is used to lock all changes to the connection state attributes
|
|
# (connection and last_error)
|
|
self.connection_state_lock = threading.Lock()
|
|
self.connection = None
|
|
self.last_error = None
|
|
self._opening = None # threading.Event of the open in progress
|
|
self._retry_at = 0.0 # monotonic time before which no new open is tried
|
|
self._failing = False # the last open failed: its failure is logged, the next ones are not
|
|
self.requests = None # the web requests using the host (HOST_REQUESTS), set by the manager
|
|
|
|
# credentials
|
|
self.host = host
|
|
self.login = login
|
|
self.passwd = passwd
|
|
self.type = conn
|
|
|
|
def connect(self):
|
|
"""Open the connection if needed, waiting at most CONNECT_TIMEOUT.
|
|
On failure last_error says why and connected stays False."""
|
|
with self.connection_state_lock:
|
|
if self.connected:
|
|
return
|
|
if self._opening is not None and self._opening.abandoned:
|
|
# A caller already waited for this open in vain; nobody waits
|
|
# again until it ends (one thread per connection, however long).
|
|
return
|
|
if time.monotonic() < self._retry_at:
|
|
return # failed recently: answer with the last error at once
|
|
if self._opening is None:
|
|
self._opening = threading.Event()
|
|
self._opening.abandoned = False
|
|
threading.Thread(target=self._open, args=(self._opening,), daemon=True).start()
|
|
opening = self._opening
|
|
|
|
if not opening.wait(CONNECT_TIMEOUT):
|
|
with self.connection_state_lock:
|
|
if self._opening is opening: # still running: give up waiting, not the open
|
|
self.last_error = util.message(gettext_noop("Connection Failed: %(host)s did not answer within %(seconds)s s"),
|
|
host=self.host, seconds=CONNECT_TIMEOUT)
|
|
opening.abandoned = True
|
|
self._log_failure()
|
|
|
|
def _open(self, opening):
|
|
"""Helper thread: open, configure and publish the connection."""
|
|
connection = error = None
|
|
try:
|
|
connection = self._open_transport()
|
|
if not connection.isAlive(): # closed again before it was published
|
|
raise util.OperationError(gettext_noop("the connection closed right after opening"))
|
|
# Drivers without keepalive or close callbacks work without them
|
|
try:
|
|
connection.setKeepAlive(connection_manager.keepalive_interval, connection_manager.keepalive_count)
|
|
except libvirtError:
|
|
pass
|
|
try:
|
|
connection.registerCloseCallback(self.__connection_close_callback, None)
|
|
except libvirtError:
|
|
pass
|
|
except Exception as e: # libvirtError, or anything else from the transport
|
|
# libvirt's own text stays as it is; one of ours is a message of its own
|
|
reason = [util.message(e.text, **e.values)] if isinstance(e, util.OperationError) else str(e)
|
|
error = util.message(gettext_noop("Connection Failed: %(error)s"), error=reason)
|
|
finally:
|
|
with self.connection_state_lock:
|
|
if error is None:
|
|
self.connection = connection
|
|
self.last_error = None
|
|
self._retry_at = 0.0
|
|
self._failing = False
|
|
logger.info("%s: connected", self.host)
|
|
else:
|
|
self.connection = None
|
|
self.last_error = error
|
|
self._retry_at = time.monotonic() + RETRY_AFTER
|
|
self._log_failure()
|
|
self._opening = None
|
|
opening.set()
|
|
|
|
def _log_failure(self):
|
|
"""Log last_error if it starts a run of failures (the caller holds connection_state_lock)."""
|
|
if not self._failing:
|
|
self._failing = True
|
|
logger.warning("%s: %s", self.host, util.render(self.last_error["text"], self.last_error["values"], str))
|
|
|
|
def _open_transport(self):
|
|
if self.type == CONN_TCP:
|
|
return self.__connect_tcp()
|
|
if self.type == CONN_SSH:
|
|
return self.__connect_ssh()
|
|
if self.type == CONN_TLS:
|
|
return self.__connect_tls()
|
|
if self.type == CONN_SOCKET:
|
|
return self.__connect_socket()
|
|
raise ValueError(f'"{self.type}" is not a valid connection type')
|
|
|
|
def alive_connection(self):
|
|
"""The libvirt connection if it is alive, else None. self.connection
|
|
is read once: the close callback can clear it at any moment."""
|
|
connection = self.connection
|
|
try:
|
|
return connection if connection is not None and connection.isAlive() else None
|
|
except libvirtError:
|
|
# isAlive failed for some reason
|
|
return None
|
|
|
|
@property
|
|
def connected(self):
|
|
return self.alive_connection() is not None
|
|
|
|
def __libvirt_auth_credentials_callback(self, credentials, user_data):
|
|
for credential in credentials:
|
|
if credential[0] == libvirt.VIR_CRED_AUTHNAME:
|
|
credential[4] = self.login
|
|
if len(credential[4]) == 0:
|
|
credential[4] = credential[3]
|
|
elif credential[0] == libvirt.VIR_CRED_PASSPHRASE:
|
|
credential[4] = self.passwd
|
|
else:
|
|
return -1
|
|
return 0
|
|
|
|
def __connection_close_callback(self, connection, reason, opaque=None):
|
|
with self.connection_state_lock:
|
|
# A late callback of a connection that was already replaced must
|
|
# not drop its successor.
|
|
if connection is not self.connection:
|
|
return
|
|
if reason in CLOSE_REASONS:
|
|
self.last_error = util.message(CLOSE_REASONS[reason])
|
|
else:
|
|
self.last_error = util.message(gettext_noop("Connection closed (%(reason)s)"), reason=reason)
|
|
# prevent other threads from using the connection (in the future)
|
|
self.connection = None
|
|
logger.warning("%s: %s", self.host, util.render(self.last_error["text"], self.last_error["values"], str))
|
|
|
|
def __connect_tcp(self):
|
|
flags = [libvirt.VIR_CRED_AUTHNAME, libvirt.VIR_CRED_PASSPHRASE]
|
|
auth = [flags, self.__libvirt_auth_credentials_callback, None]
|
|
return libvirt.openAuth(f"qemu+tcp://{self.host}/system", auth, 0)
|
|
|
|
def __connect_ssh(self):
|
|
return libvirt.open(f"qemu+ssh://{self.login}@{self.host}/system?command={quote(SSH_COMMAND)}")
|
|
|
|
def __connect_tls(self):
|
|
flags = [libvirt.VIR_CRED_AUTHNAME, libvirt.VIR_CRED_PASSPHRASE]
|
|
auth = [flags, self.__libvirt_auth_credentials_callback, None]
|
|
return libvirt.openAuth(f"qemu+tls://{self.login}@{self.host}/system", auth, 0)
|
|
|
|
def __connect_socket(self):
|
|
return libvirt.open("qemu:///system")
|
|
|
|
def close(self):
|
|
"""
|
|
closes the connection (if it is active)
|
|
"""
|
|
self.connection_state_lock.acquire()
|
|
try:
|
|
if self.connected:
|
|
try:
|
|
# to-do: handle errors?
|
|
self.connection.close()
|
|
except libvirtError:
|
|
pass
|
|
|
|
self.connection = None
|
|
self.last_error = None
|
|
finally:
|
|
self.connection_state_lock.release()
|
|
|
|
def __del__(self):
|
|
if self.connection is not None:
|
|
# unregister callback (as it is no longer valid if this instance gets deleted)
|
|
try:
|
|
self.connection.unregisterCloseCallback()
|
|
except Exception:
|
|
pass
|
|
|
|
def __str__(self):
|
|
if self.type == CONN_TCP:
|
|
type_str = "tcp"
|
|
elif self.type == CONN_SSH:
|
|
type_str = "ssh"
|
|
elif self.type == CONN_TLS:
|
|
type_str = "tls"
|
|
else:
|
|
type_str = "invalid_type"
|
|
|
|
return f"qemu+{type_str}://{self.login}@{self.host}/system"
|
|
|
|
def __repr__(self):
|
|
return f"<wvmConnection {str(self)}>"
|
|
|
|
|
|
class wvmConnectionManager(object):
|
|
def __init__(self, keepalive_interval=5, keepalive_count=5):
|
|
self.keepalive_interval = keepalive_interval
|
|
self.keepalive_count = keepalive_count
|
|
|
|
# connection dict
|
|
# maps hostnames to a list of connection objects for this hostname
|
|
# atm it is possible to create more than one connection per hostname
|
|
# with different logins or auth methods
|
|
# connections are shared between all threads, see:
|
|
# http://wiki.libvirt.org/page/FAQ#Is_libvirt_thread_safe.3F
|
|
self._connections = dict()
|
|
self._connections_lock = ReadWriteLock()
|
|
self._inherited = []
|
|
self._host_requests = {} # host: the web requests using it, whatever the login (HOST_REQUESTS)
|
|
|
|
def forget_connections(self):
|
|
"""For a forked child: stop using the inherited connections (the
|
|
parent's sockets). They are kept, not released: their destructors
|
|
would call libvirt in the child."""
|
|
self._inherited.append(self._connections)
|
|
self._connections = dict()
|
|
self._connections_lock = ReadWriteLock()
|
|
self._host_requests = {}
|
|
|
|
def _search_connection(self, host, login, passwd, conn):
|
|
"""
|
|
search the connection dict for a connection with the given credentials
|
|
if it does not exist return None
|
|
"""
|
|
self._connections_lock.acquireRead()
|
|
try:
|
|
if host in self._connections:
|
|
connections = self._connections[host]
|
|
|
|
for connection in connections:
|
|
if connection.login == login and connection.passwd == passwd and connection.type == conn:
|
|
return connection
|
|
finally:
|
|
self._connections_lock.release()
|
|
|
|
return None
|
|
|
|
def get_connection(self, host, login, passwd, conn):
|
|
"""
|
|
returns a connection object (as returned by the libvirt.open* methods) for the given host and credentials
|
|
raises libvirtError if (re)connecting fails
|
|
"""
|
|
start_event_loop()
|
|
# force all string values to unicode
|
|
host = str(host)
|
|
login = str(login)
|
|
passwd = str(passwd) if passwd is not None else None
|
|
|
|
connection = self._search_connection(host, login, passwd, conn)
|
|
|
|
if connection is None:
|
|
self._connections_lock.acquireWrite()
|
|
try:
|
|
# we have to search for the connection again after acquiring the write lock
|
|
# as the thread previously holding the write lock may have already added our connection
|
|
connection = self._search_connection(host, login, passwd, conn)
|
|
if connection is None:
|
|
# Only register it here: connecting under the global lock
|
|
# would make every other host wait for a slow one.
|
|
connection = wvmConnection(host, login, passwd, conn)
|
|
connection.requests = self._host_requests.setdefault(
|
|
host, threading.BoundedSemaphore(HOST_REQUESTS))
|
|
self._connections.setdefault(host, []).append(connection)
|
|
finally:
|
|
self._connections_lock.release()
|
|
|
|
_count_on(connection)
|
|
live = connection.alive_connection()
|
|
if live is None:
|
|
# (re-)connect within CONNECT_TIMEOUT; one open per connection at a time
|
|
connection.connect()
|
|
live = connection.alive_connection()
|
|
if live is None:
|
|
# a connection that died without a close callback leaves no error behind
|
|
error = connection.last_error or util.message(gettext_noop("Connection Failed: %(host)s is not connected"),
|
|
host=connection.host)
|
|
raise util.ConnectionFailed(error["text"], **error["values"])
|
|
return live
|
|
|
|
connection_manager = wvmConnectionManager(
|
|
settings.LIBVIRT_KEEPALIVE_INTERVAL if hasattr(settings, "LIBVIRT_KEEPALIVE_INTERVAL") else 5,
|
|
settings.LIBVIRT_KEEPALIVE_COUNT if hasattr(settings, "LIBVIRT_KEEPALIVE_COUNT") else 5,
|
|
)
|
|
|
|
|
|
class wvmConnect(object):
|
|
def __init__(self, host, login, passwd, conn):
|
|
self.login = login
|
|
self.host = host
|
|
self.passwd = passwd
|
|
self.conn = conn
|
|
|
|
# get connection from connection manager
|
|
self.wvm = connection_manager.get_connection(host, login, passwd, conn)
|
|
|
|
def is_qemu(self):
|
|
return self.wvm.getURI().startswith("qemu")
|
|
|
|
@cached_property
|
|
def capabilities_xml(self):
|
|
"""The host's capabilities, read once per object (a request): most getters below parse them"""
|
|
return self.wvm.getCapabilities()
|
|
|
|
def host_uuid(self):
|
|
"""The host's UUID (capabilities): compute records of one host share it"""
|
|
return util.get_xml_path(self.capabilities_xml, "/capabilities/host/uuid")
|
|
|
|
@cached_property
|
|
def host_info(self):
|
|
"""The host's info (architecture, memory in MiB, CPUs, ...), read once per object"""
|
|
return self.wvm.getInfo()
|
|
|
|
@cached_property
|
|
def dom_cap_xmls(self):
|
|
"""The domain capabilities read so far, by emulator, arch, machine and domain type"""
|
|
return {}
|
|
|
|
def get_cap_xml(self):
|
|
"""Return xml capabilities"""
|
|
return self.capabilities_xml
|
|
|
|
def get_dom_cap_xml(self, arch, machine):
|
|
""" Return domain capabilities xml"""
|
|
emulatorbin = self.get_emulator(arch)
|
|
domain_types = self.get_hypervisors_domain_types().get(arch)
|
|
if domain_types is None: # the architecture comes from the URL
|
|
raise util.OperationError(gettext_noop("This host has no architecture %(arch)s"), arch=arch)
|
|
virttype = "kvm" if "kvm" in domain_types else "qemu"
|
|
|
|
machine_types = self.get_machine_types(arch)
|
|
if not machine or machine not in machine_types:
|
|
machine = "pc" if "pc" in machine_types else machine_types[0]
|
|
key = (emulatorbin, arch, machine, virttype)
|
|
if key not in self.dom_cap_xmls:
|
|
self.dom_cap_xmls[key] = self.wvm.getDomainCapabilities(*key)
|
|
return self.dom_cap_xmls[key]
|
|
|
|
def get_capabilities(self, arch):
|
|
""" Host Capabilities for specified architecture """
|
|
|
|
def guests(ctx):
|
|
result = dict()
|
|
for arch_el in ctx.xpath("/capabilities/guest/arch[@name=$arch]", arch=arch):
|
|
result["wordsize"] = arch_el.find("wordsize").text
|
|
result["emulator"] = arch_el.find("emulator").text
|
|
result["domain"] = [v for v in arch_el.xpath("domain/@type")]
|
|
|
|
result["machines"] = []
|
|
for m in arch_el.xpath("machine"):
|
|
result["machines"].append(
|
|
{"machine": m.text, "max_cpu": m.get("maxCpus"), "canonical": m.get("canonical")}
|
|
)
|
|
|
|
guest_el = arch_el.getparent()
|
|
for f in guest_el.xpath("features"):
|
|
result["features"] = [t.tag for t in f.getchildren()]
|
|
|
|
result["os_type"] = guest_el.find("os_type").text
|
|
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_cap_xml(), func=guests)
|
|
|
|
def get_dom_capabilities(self, arch, machine):
|
|
"""Return domain capabilities"""
|
|
result = dict()
|
|
|
|
xml = self.get_dom_cap_xml(arch, machine)
|
|
result["path"] = util.get_xml_path(xml, "/domainCapabilities/path")
|
|
result["domain"] = util.get_xml_path(xml, "/domainCapabilities/domain")
|
|
result["machine"] = util.get_xml_path(xml, "/domainCapabilities/machine")
|
|
result["vcpu_max"] = util.get_xml_path(xml, "/domainCapabilities/vcpu/@max")
|
|
result["iothreads_support"] = util.get_xml_path(xml, "/domainCapabilities/iothreads/@supported")
|
|
result["os_support"] = util.get_xml_path(xml, "/domainCapabilities/os/@supported")
|
|
|
|
result["loader_support"] = util.get_xml_path(xml, "/domainCapabilities/os/loader/@supported")
|
|
if result["loader_support"] == "yes":
|
|
result["loaders"] = self.get_os_loaders(arch, machine)
|
|
result["loader_enums"] = self.get_os_loader_enums(arch, machine)
|
|
|
|
result["cpu_modes"] = self.get_cpu_modes(arch, machine)
|
|
if "custom" in result["cpu_modes"]:
|
|
# supported and unknown cpu models
|
|
result["cpu_custom_models"] = self.get_cpu_custom_types(arch, machine)
|
|
|
|
result["disk_support"] = util.get_xml_path(xml, "/domainCapabilities/devices/disk/@supported")
|
|
if result["disk_support"] == "yes":
|
|
result["disk_devices"] = self.get_disk_device_types(arch, machine)
|
|
result["disk_bus"] = self.get_disk_bus_types(arch, machine)
|
|
|
|
result["video_support"] = util.get_xml_path(xml, "/domainCapabilities/devices/video/@supported")
|
|
if result["video_support"] == "yes":
|
|
result["video_types"] = self.get_video_models(arch, machine)
|
|
|
|
result["hostdev_support"] = util.get_xml_path(xml, "/domainCapabilities/devices/hostdev/@supported")
|
|
if result["hostdev_support"] == "yes":
|
|
result["hostdev_types"] = self.get_hostdev_modes(arch, machine)
|
|
result["hostdev_startup_policies"] = self.get_hostdev_startup_policies(arch, machine)
|
|
result["hostdev_subsys_types"] = self.get_hostdev_subsys_types(arch, machine)
|
|
|
|
result["features_gic_support"] = util.get_xml_path(xml, "/domainCapabilities/features/gic/@supported")
|
|
result["features_genid_support"] = util.get_xml_path(xml, "/domainCapabilities/features/genid/@supported")
|
|
result["features_vmcoreinfo_support"] = util.get_xml_path(
|
|
xml, "/domainCapabilities/features/vmcoreinfo/@supported"
|
|
)
|
|
result["features_sev_support"] = util.get_xml_path(xml, "/domainCapabilities/features/sev/@supported")
|
|
|
|
return result
|
|
|
|
def get_version(self):
|
|
"""
|
|
:return: libvirt version
|
|
"""
|
|
ver = self.wvm.getVersion()
|
|
major = ver // 1000000
|
|
ver = ver % 1000000
|
|
minor = ver // 1000
|
|
ver = ver % 1000
|
|
release = ver
|
|
return f"{major}.{minor}.{release}"
|
|
|
|
def get_lib_version(self):
|
|
ver = self.wvm.getLibVersion()
|
|
major = ver // 1000000
|
|
ver %= 1000000
|
|
minor = ver // 1000
|
|
ver %= 1000
|
|
release = ver
|
|
return f"{major}.{minor}.{release}"
|
|
|
|
def get_storages(self, only_actives=False):
|
|
"""
|
|
:return: list of active or all storages
|
|
"""
|
|
storages = []
|
|
for pool in self.wvm.listStoragePools():
|
|
storages.append(pool)
|
|
if not only_actives:
|
|
for pool in self.wvm.listDefinedStoragePools():
|
|
storages.append(pool)
|
|
return storages
|
|
|
|
def get_networks(self):
|
|
"""
|
|
:return: list of host networks
|
|
"""
|
|
virtnet = []
|
|
for net in self.wvm.listNetworks():
|
|
virtnet.append(net)
|
|
for net in self.wvm.listDefinedNetworks():
|
|
virtnet.append(net)
|
|
return virtnet
|
|
|
|
def get_ifaces(self):
|
|
"""The names of the host's interfaces, in every state."""
|
|
return [iface.name() for iface in self.wvm.listAllInterfaces(0)]
|
|
|
|
def get_nwfilters(self):
|
|
"""
|
|
:return: list of network filters
|
|
"""
|
|
nwfilters = []
|
|
for nwfilter in self.wvm.listNWFilters():
|
|
nwfilters.append(nwfilter)
|
|
return nwfilters
|
|
|
|
def get_cache_modes(self):
|
|
"""
|
|
:return: Get cache available modes
|
|
"""
|
|
return {
|
|
"default": "Default",
|
|
"none": "Disabled",
|
|
"writethrough": "Write through",
|
|
"writeback": "Write back",
|
|
"directsync": "Direct sync", # since libvirt 0.9.5
|
|
"unsafe": "Unsafe", # since libvirt 0.9.7
|
|
}
|
|
|
|
def get_io_modes(self):
|
|
"""
|
|
:return: available io modes
|
|
"""
|
|
return {
|
|
"default": "Default",
|
|
"native": "Native",
|
|
"threads": "Threads",
|
|
}
|
|
|
|
def get_discard_modes(self):
|
|
"""
|
|
:return: available discard modes
|
|
"""
|
|
return {
|
|
"default": "Default",
|
|
"ignore": "Ignore",
|
|
"unmap": "Unmap",
|
|
}
|
|
|
|
def get_detect_zeroes_modes(self):
|
|
"""
|
|
:return: available detect zeroes modes
|
|
"""
|
|
return {
|
|
"default": "Default",
|
|
"on": "On",
|
|
"off": "Off",
|
|
"unmap": "Unmap",
|
|
}
|
|
|
|
def get_hypervisors_domain_types(self):
|
|
"""
|
|
:return: hypervisor domain types
|
|
"""
|
|
|
|
def hypervisors(ctx):
|
|
result = {}
|
|
for arch in ctx.xpath("/capabilities/guest/arch"):
|
|
domain_types = arch.xpath("domain/@type")
|
|
arch_name = arch.xpath("@name")[0]
|
|
result[arch_name] = domain_types
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_cap_xml(), func=hypervisors)
|
|
|
|
def get_hypervisors_machines(self):
|
|
"""
|
|
:return: hypervisor and its machine types
|
|
"""
|
|
|
|
def machines(ctx):
|
|
result = dict()
|
|
for arche in ctx.xpath("/capabilities/guest/arch"):
|
|
arch = arche.get("name")
|
|
|
|
result[arch] = self.get_machine_types(arch)
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_cap_xml(), func=machines)
|
|
|
|
def get_emulator(self, arch):
|
|
"""
|
|
:return: emulator list
|
|
"""
|
|
# arch comes from the URL: an XPath variable, not part of the expression
|
|
def emulator(ctx):
|
|
found = ctx.xpath("/capabilities/guest/arch[@name=$arch]/emulator", arch=arch)
|
|
return found[0].text if found else None
|
|
|
|
return util.get_xml_path(self.get_cap_xml(), func=emulator)
|
|
|
|
def get_machine_types(self, arch):
|
|
"""
|
|
:return: canonical(if exist) name of machine types
|
|
"""
|
|
|
|
def machines(ctx):
|
|
result = list()
|
|
canonical_name = ctx.xpath("/capabilities/guest/arch[@name=$arch]/machine[@canonical]", arch=arch)
|
|
if not canonical_name:
|
|
canonical_name = ctx.xpath("/capabilities/guest/arch[@name=$arch]/machine", arch=arch)
|
|
for archi in canonical_name:
|
|
result.append(archi.text)
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_cap_xml(), func=machines)
|
|
|
|
def get_os_loaders(self, arch="x86_64", machine="pc"):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available os loaders list
|
|
"""
|
|
|
|
def get_os_loaders(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/os/loader[@supported='yes']/value")]
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_os_loaders)
|
|
|
|
def get_os_loader_enums(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available os loaders list
|
|
"""
|
|
|
|
def get_os_loader_enums(ctx):
|
|
result = dict()
|
|
enums = [v for v in ctx.xpath("/domainCapabilities/os/loader[@supported='yes']/enum/@name")]
|
|
for enum in enums:
|
|
path = "/domainCapabilities/os/loader[@supported='yes']/enum[@name='{}']/value".format(enum)
|
|
result[enum] = [v.text for v in ctx.xpath(path)]
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_os_loader_enums)
|
|
|
|
def get_disk_bus_types(self, arch, machine):
|
|
"""
|
|
:param machine:
|
|
:param arch:
|
|
:return: available disk bus types list
|
|
"""
|
|
|
|
def get_bus_list(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/devices/disk/enum[@name='bus']/value")]
|
|
|
|
# return [ 'ide', 'scsi', 'usb', 'virtio' ]
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_bus_list)
|
|
|
|
def get_disk_device_types(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available disk device type list
|
|
"""
|
|
|
|
def get_device_list(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/devices/disk/enum[@name='diskDevice']/value")]
|
|
|
|
# return [ 'disk', 'cdrom', 'floppy', 'lun' ]
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_device_list)
|
|
|
|
def get_cpu_modes(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available cpu modes
|
|
"""
|
|
|
|
def get_cpu_modes(ctx):
|
|
return [v for v in ctx.xpath("/domainCapabilities/cpu/mode[@supported='yes']/@name")]
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_cpu_modes)
|
|
|
|
def get_cpu_custom_types(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available graphics types
|
|
"""
|
|
|
|
def get_custom_list(ctx):
|
|
usable_yes = "/domainCapabilities/cpu/mode[@name='custom'][@supported='yes']/model[@usable='yes']"
|
|
usable_unknown = "/domainCapabilities/cpu/mode[@name='custom'][@supported='yes']/model[@usable='unknown']"
|
|
result = [v.text for v in ctx.xpath(usable_yes)]
|
|
result += [v.text for v in ctx.xpath(usable_unknown)]
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_custom_list)
|
|
|
|
def get_hostdev_modes(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return. available nodedev modes
|
|
"""
|
|
|
|
def get_hostdev_list(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/devices/hostdev/enum[@name='mode']/value")]
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_hostdev_list)
|
|
|
|
def get_hostdev_startup_policies(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available hostdev modes
|
|
"""
|
|
|
|
def get_hostdev_list(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/devices/hostdev/enum[@name='startupPolicy']/value")]
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_hostdev_list)
|
|
|
|
def get_hostdev_subsys_types(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available nodedev sub system types
|
|
"""
|
|
|
|
def get_hostdev_list(ctx):
|
|
return [v.text for v in ctx.xpath("/domainCapabilities/devices/hostdev/enum[@name='subsysType']/value")]
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_hostdev_list)
|
|
|
|
def get_network_models(self):
|
|
"""
|
|
:return: network card models
|
|
"""
|
|
return ["default", "e1000", "e1000e", "rtl8139", "virtio"]
|
|
|
|
def get_image_formats(self):
|
|
"""
|
|
:return: available image formats
|
|
"""
|
|
return ["raw", "qcow", "qcow2"]
|
|
|
|
def get_video_models(self, arch, machine):
|
|
"""
|
|
:param arch: architecture
|
|
:param machine:
|
|
:return: available graphics video types
|
|
"""
|
|
|
|
def get_video_list(ctx):
|
|
result = []
|
|
for video_enum in ctx.xpath("/domainCapabilities/devices/video/enum"):
|
|
if video_enum.xpath("@name")[0] == "modelType":
|
|
for values in video_enum:
|
|
result.append(values.text)
|
|
return result
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=get_video_list)
|
|
|
|
def get_iface(self, name):
|
|
return self.wvm.interfaceLookupByName(name)
|
|
|
|
def get_secrets_info(self):
|
|
"""Every secret of the host: UUID, usage type and usage (a volume
|
|
path, an iSCSI target, a Ceph or TLS or vTPM name), whether it is
|
|
ephemeral and private. One listing, one XML read per secret; a secret
|
|
gone meanwhile is left out."""
|
|
secrets = []
|
|
for secret in self.wvm.listAllSecrets(0):
|
|
try:
|
|
tree = etree.fromstring(secret.XMLDesc(0))
|
|
except libvirtError as err:
|
|
if err.get_error_code() != libvirt.VIR_ERR_NO_SECRET:
|
|
raise
|
|
continue
|
|
secrets.append({
|
|
"uuid": secret.UUIDString(),
|
|
"usage_type": tree.xpath("string(usage/@type)") or "none",
|
|
"usage": tree.xpath("string(usage/*)"),
|
|
"ephemeral": tree.get("ephemeral") == "yes",
|
|
"private": tree.get("private") == "yes",
|
|
})
|
|
return sorted(secrets, key=lambda secret: (secret["usage_type"], secret["usage"]))
|
|
|
|
def get_storage(self, name):
|
|
return self.wvm.storagePoolLookupByName(name)
|
|
|
|
def get_volume_by_path(self, path):
|
|
return self.wvm.storageVolLookupByPath(path)
|
|
|
|
def backing_path(self, path):
|
|
"""The backing file of a volume; None if it has none or is in no pool.
|
|
Any other error is raised: a chain cut short would let a file a kept
|
|
one needs count as deletable."""
|
|
try:
|
|
vol = self.get_volume_by_path(path)
|
|
except libvirtError as err:
|
|
if err.get_error_code() != libvirt.VIR_ERR_NO_STORAGE_VOL:
|
|
raise
|
|
return None
|
|
return util.get_xml_path(vol.XMLDesc(0), "/volume/backingStore/path")
|
|
|
|
def remove_nvram(self, path, destination):
|
|
"""Deletes the NVRAM file of a VM that migrated from this host to
|
|
destination (a wvmConnect). Only a file in libvirt's per-host NVRAM
|
|
directory, and only when destination does not see that directory too
|
|
(shared storage would hold the migrated VM's own file). Returns
|
|
whether a file was deleted."""
|
|
if os.path.dirname(path) != NVRAM_DIR:
|
|
return False
|
|
with self._nvram_pool() as pool, destination._nvram_pool() as other:
|
|
try:
|
|
if self.same_directory(pool, other):
|
|
return False
|
|
except libvirtError:
|
|
return False # not known to be the source's own file
|
|
vol = self._find_volume(pool, os.path.basename(path))
|
|
if vol is None:
|
|
return False
|
|
vol.delete(0)
|
|
return True
|
|
|
|
@staticmethod
|
|
def same_directory(pool, other):
|
|
"""Whether pools of two hosts are one directory: creating the same
|
|
file in both fails then, as it exists already. The create is
|
|
exclusive on the file server, unlike a directory listing, which an
|
|
NFS client may cache. Any other failure raises: it tells nothing."""
|
|
marker = (
|
|
f"<volume><name>webvirtcloud-check-{uuid.uuid4().hex}</name><capacity>0</capacity>"
|
|
"<target><format type='raw'/></target></volume>"
|
|
)
|
|
mine = pool.createXML(marker, 0)
|
|
try:
|
|
other.createXML(marker, 0).delete(0)
|
|
except libvirtError as error:
|
|
# the file exists (OPERATION_INVALID), or the pool lists it already
|
|
if error.get_error_code() in (libvirt.VIR_ERR_OPERATION_INVALID, libvirt.VIR_ERR_STORAGE_VOL_EXIST):
|
|
return True
|
|
raise
|
|
finally:
|
|
mine.delete(0)
|
|
return False
|
|
|
|
def pool_at(self, directory):
|
|
"""The active pool whose directory is directory, or None. A pool
|
|
without a target path (rbd, gluster, ...) holds no files."""
|
|
for pool in self.wvm.listAllStoragePools(libvirt.VIR_CONNECT_LIST_STORAGE_POOLS_ACTIVE):
|
|
if (util.get_xml_path(pool.XMLDesc(0), "/pool/target/path") or "").rstrip("/") == directory:
|
|
return pool
|
|
return None
|
|
|
|
def file_pools(self):
|
|
"""The active pools of this host that keep disks as files, a copy's
|
|
destination: {name: (pool, directory)}."""
|
|
pools = {}
|
|
for pool in self.wvm.listAllStoragePools(libvirt.VIR_CONNECT_LIST_STORAGE_POOLS_ACTIVE):
|
|
tree = etree.fromstring(pool.XMLDesc(0))
|
|
if tree.get("type") in ("dir", "fs", "netfs") and tree.findtext("target/path"):
|
|
pools[pool.name()] = (pool, tree.findtext("target/path").rstrip("/"))
|
|
return pools
|
|
|
|
@contextlib.contextmanager
|
|
def _nvram_pool(self):
|
|
"""An active, refreshed pool on NVRAM_DIR: libvirt reads and deletes
|
|
files only as volumes of a pool. A transient one when none exists."""
|
|
pool = self.pool_at(NVRAM_DIR)
|
|
if pool is not None:
|
|
pool.refresh(0)
|
|
yield pool
|
|
return
|
|
pool = self.wvm.storagePoolCreateXML(
|
|
f"<pool type='dir'><name>webvirtcloud-nvram-{uuid.uuid4().hex[:8]}</name>"
|
|
f"<target><path>{NVRAM_DIR}</path></target></pool>",
|
|
0,
|
|
)
|
|
try:
|
|
yield pool
|
|
finally:
|
|
# a transient pool left by a failed destroy goes with libvirtd's next restart
|
|
with contextlib.suppress(libvirtError):
|
|
pool.destroy()
|
|
|
|
def upload_volume(self, pool, name, data):
|
|
"""A new raw volume in pool holding data, written through a libvirt
|
|
stream, which every connection type carries. A failed write leaves
|
|
no volume."""
|
|
stream = self.wvm.newStream(0)
|
|
vol = None
|
|
try:
|
|
vol = pool.createXML(
|
|
f"<volume><name>{util.xml_escape(name)}</name><capacity>{len(data)}</capacity>"
|
|
"<target><format type='raw'/></target></volume>",
|
|
0,
|
|
)
|
|
vol.upload(stream, 0, len(data), 0)
|
|
stream.sendAll(lambda _stream, size, buffer: buffer.read(size), io.BytesIO(data))
|
|
stream.finish()
|
|
except Exception:
|
|
# libvirt: a stream that did not finish is aborted before it is freed
|
|
with contextlib.suppress(libvirtError):
|
|
stream.abort()
|
|
if vol is not None:
|
|
vol.delete(0)
|
|
raise
|
|
return vol
|
|
|
|
@staticmethod
|
|
def _find_volume(pool, name):
|
|
try:
|
|
return pool.storageVolLookupByName(name)
|
|
except libvirtError as err:
|
|
if err.get_error_code() == libvirt.VIR_ERR_NO_STORAGE_VOL:
|
|
return None
|
|
raise
|
|
|
|
def get_network(self, net):
|
|
return self.wvm.networkLookupByName(net)
|
|
|
|
def get_nwfilter(self, name):
|
|
return self.wvm.nwfilterLookupByName(name)
|
|
|
|
def get_instance(self, name):
|
|
return self.wvm.lookupByName(name)
|
|
|
|
def get_instances(self):
|
|
instances = []
|
|
for inst_id in self.wvm.listDomainsID():
|
|
dom = self.wvm.lookupByID(int(inst_id))
|
|
instances.append(dom.name())
|
|
for name in self.wvm.listDefinedDomains():
|
|
instances.append(name)
|
|
return instances
|
|
|
|
def get_domain_states(self):
|
|
"""{uuid: [name, state]} of every domain, in one call."""
|
|
return {dom.UUIDString(): [dom.name(), stats["state.state"]]
|
|
for dom, stats in self.wvm.getAllDomainStats(libvirt.VIR_DOMAIN_STATS_STATE)}
|
|
|
|
def get_domain_rows(self, uuids=None):
|
|
"""{uuid: (info, title)} of every domain, or of those in uuids, as the
|
|
VM lists show them: info in virDomainGetInfo's shape (state, max
|
|
memory KiB, memory KiB, vCPUs), the states in one call and the rest
|
|
from each domain's live XML, which the title needs anyway. A domain
|
|
gone meanwhile is left out."""
|
|
rows = {}
|
|
for dom, stats in self.wvm.getAllDomainStats(libvirt.VIR_DOMAIN_STATS_STATE):
|
|
if uuids is not None and dom.UUIDString() not in uuids:
|
|
continue # a VM the list does not show: its XML is not read
|
|
try:
|
|
doc = etree.fromstring(dom.XMLDesc(0))
|
|
except libvirtError:
|
|
continue
|
|
vcpu = doc.find("vcpu")
|
|
info = [stats["state.state"], int(doc.findtext("memory")), int(doc.findtext("currentMemory")),
|
|
int(vcpu.get("current", vcpu.text))]
|
|
rows[dom.UUIDString()] = (info, doc.findtext("title") or "")
|
|
return rows
|
|
|
|
def domain_trees(self, running_only=False):
|
|
"""Each domain's name with its definitions, parsed: the live one, and
|
|
for a persistent domain the one saved for its next boot too, read
|
|
whether it runs or not (it may stop meanwhile); with running_only the
|
|
live one of each running domain. A domain gone meanwhile is left out."""
|
|
listing = libvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE if running_only else 0
|
|
for dom in self.wvm.listAllDomains(listing):
|
|
try:
|
|
xmls = [dom.XMLDesc(0)]
|
|
if not running_only and dom.isPersistent():
|
|
xmls.append(dom.XMLDesc(libvirt.VIR_DOMAIN_XML_INACTIVE))
|
|
except libvirtError as err:
|
|
if err.get_error_code() != libvirt.VIR_ERR_NO_DOMAIN:
|
|
raise
|
|
continue
|
|
yield dom.name(), [etree.fromstring(xml) for xml in xmls]
|
|
|
|
def domains_using(self, match, running_only=False):
|
|
"""Names of the domains with a definition (domain_trees) that
|
|
match(tree) holds for."""
|
|
return sorted(name for name, trees in self.domain_trees(running_only) if any(map(match, trees)))
|
|
|
|
def paths_in_use(self, skip_uuid=None, own=()):
|
|
"""Paths (names for network disks) a domain uses as a disk or a
|
|
backing file of one, or as a file of its snapshots (overlays, memory,
|
|
the disks they were taken on); and the backing files of volumes.
|
|
skip_uuid leaves out one domain, own the volumes whose backing files
|
|
do not count."""
|
|
used = set()
|
|
for dom in self.wvm.listAllDomains():
|
|
if dom.UUIDString() == skip_uuid:
|
|
continue
|
|
for flags in (0, libvirt.VIR_DOMAIN_XML_INACTIVE):
|
|
used.update(self._source_paths(etree.fromstring(dom.XMLDesc(flags))))
|
|
for snap in dom.listAllSnapshots(0):
|
|
tree = etree.fromstring(snap.getXMLDesc(0))
|
|
used.update(tree.xpath("disks/disk/source/@file|memory/@file"))
|
|
for saved in tree.xpath("domain|inactiveDomain"):
|
|
used.update(self._source_paths(saved))
|
|
# A stopped domain's XML has no backing chain; the volumes have it.
|
|
# Any volume backed by a path keeps that path, even an unattached one.
|
|
for pool in self.wvm.listAllStoragePools():
|
|
if not pool.isActive():
|
|
continue
|
|
with contextlib.suppress(libvirtError):
|
|
pool.refresh(0)
|
|
for vol in pool.listAllVolumes():
|
|
# only a volume removed meanwhile is skipped: one that cannot
|
|
# be read may still keep a backing file
|
|
try:
|
|
if vol.path() not in own:
|
|
used.update(etree.fromstring(vol.XMLDesc(0)).xpath("./backingStore/path/text()"))
|
|
except libvirtError as err:
|
|
if err.get_error_code() != libvirt.VIR_ERR_NO_STORAGE_VOL:
|
|
raise
|
|
return used
|
|
|
|
def _source_paths(self, domain):
|
|
"""The files, devices or network names of a domain definition's
|
|
disks and of their backing chains ("//" reaches a running domain's
|
|
backingStore); a pool volume source as its volume's path."""
|
|
paths = []
|
|
for source in domain.xpath("devices/disk//source"):
|
|
if source.get("pool") and source.get("volume"):
|
|
try:
|
|
pool = self.wvm.storagePoolLookupByName(source.get("pool"))
|
|
paths.append(pool.storageVolLookupByName(source.get("volume")).path())
|
|
except libvirtError as err:
|
|
# a volume that is not there cannot be the one deleted
|
|
if err.get_error_code() not in (libvirt.VIR_ERR_NO_STORAGE_VOL, libvirt.VIR_ERR_NO_STORAGE_POOL):
|
|
raise
|
|
else:
|
|
paths += [v for v in (source.get("file"), source.get("dev"), source.get("name")) if v]
|
|
return paths
|
|
|
|
def can_change_interfaces(self):
|
|
"""Whether the host's libvirt can define interfaces: the udev backend
|
|
only reads them. The definition sent is invalid, so nothing is
|
|
defined: a backend without define refuses it as unsupported, one with
|
|
define as bad XML. Any other refusal, of the connection say, is not an
|
|
answer and is raised; one the host's access rules give is a no."""
|
|
try:
|
|
self.wvm.interfaceDefineXML("<interface/>", 0)
|
|
except libvirtError as err:
|
|
if err.get_error_code() in (libvirt.VIR_ERR_NO_SUPPORT, libvirt.VIR_ERR_OPERATION_DENIED):
|
|
return False
|
|
if err.get_error_code() in (libvirt.VIR_ERR_XML_ERROR, libvirt.VIR_ERR_XML_DETAIL):
|
|
return True
|
|
raise
|
|
return True
|
|
|
|
def get_net_devices(self):
|
|
"""The host's network interface names; libvirt lists only the network devices"""
|
|
return [
|
|
util.get_xml_path(dev.XMLDesc(0), "/device/capability/interface")
|
|
for dev in self.wvm.listAllDevices(libvirt.VIR_CONNECT_LIST_NODE_DEVICES_CAP_NET)
|
|
]
|
|
|
|
def close(self):
|
|
"""Close connection"""
|
|
# to-do: do not close connection ;)
|
|
# self.wvm.close()
|
|
pass
|
|
|
|
def get_firmwares(self, arch, machine):
|
|
"""The firmware a new VM can have: BIOS on x86, UEFI without Secure Boot
|
|
when libvirt picks the firmware itself, and on x86_64 UEFI Secure Boot
|
|
with Microsoft's keys enrolled, as Windows 11 needs."""
|
|
|
|
def firmwares(ctx):
|
|
os_caps = "/domainCapabilities/os[@supported='yes']"
|
|
features = f"{os_caps}/firmwareFeatures[@supported='yes']"
|
|
if ctx.xpath(features): # libvirt 12.1 and later: what its firmware offers
|
|
secure_boot = ctx.xpath(f"{features}/enum[@name='secureBoot']/value/text()")
|
|
enrolled_keys = ctx.xpath(f"{features}/enum[@name='enrolledKeys']/value/text()")
|
|
else: # earlier: the loaders; libvirt refuses the VM if no firmware has the keys
|
|
secure_boot = ctx.xpath(f"{os_caps}/loader[@supported='yes']/enum[@name='secure']/value/text()") or ["no"]
|
|
enrolled_keys = secure_boot
|
|
choices = ["BIOS"] if arch in ("i686", "x86_64") else []
|
|
if "efi" in ctx.xpath(f"{os_caps}/enum[@name='firmware']/value/text()"):
|
|
if "no" in secure_boot:
|
|
choices.append("UEFI")
|
|
if arch == "x86_64" and "yes" in secure_boot and "yes" in enrolled_keys:
|
|
choices.append("UEFI Secure Boot")
|
|
return choices
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=firmwares)
|
|
|
|
def get_tpm_model(self, arch, machine):
|
|
"""The model of an emulated TPM 2.0 for a new VM; None when the host has
|
|
none (no swtpm)."""
|
|
|
|
def tpm_model(ctx):
|
|
tpm = "/domainCapabilities/devices/tpm[@supported='yes']"
|
|
if ("emulator" not in ctx.xpath(f"{tpm}/enum[@name='backendModel']/value/text()")
|
|
or "2.0" not in ctx.xpath(f"{tpm}/enum[@name='backendVersion']/value/text()")):
|
|
return None
|
|
models = ctx.xpath(f"{tpm}/enum[@name='model']/value/text()")
|
|
# x86: CRB, which Windows takes, or TIS; another machine: its own
|
|
for model in ("tpm-crb", "tpm-tis", *models):
|
|
if model in models:
|
|
return model
|
|
return None
|
|
|
|
return util.get_xml_path(self.get_dom_cap_xml(arch, machine), func=tpm_model)
|
|
|
|
def is_supports_virtio(self, arch, machine):
|
|
if not self.is_qemu():
|
|
return False
|
|
|
|
# These _only_ support virtio so don't check the OS
|
|
if arch in ["aarch64", "armv7l", "ppc64", "ppc64le", "s390x", "riscv64", "riscv32"] and machine in [
|
|
"virt",
|
|
"pseries",
|
|
]:
|
|
return True
|
|
|
|
if arch in ["x86_64", "i686"]:
|
|
return True
|
|
|
|
return False
|