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Python queue, 2019-02-22

Browse source 
Python:
 * introduce "python" directory with module namespace
 * log QEMU launch command line on qemu.QEMUMachine
 
 Acceptance Tests:
 * initrd 4GiB+ test
 * migration test
 * multi vm support in test class
 * bump Avocado version and drop "🥑 enable"
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Merge remote-tracking branch 'remotes/cleber/tags/python-next-pull-request' into staging

Python queue, 2019-02-22

Python:
* introduce "python" directory with module namespace
* log QEMU launch command line on qemu.QEMUMachine

Acceptance Tests:
* initrd 4GiB+ test
* migration test
* multi vm support in test class
* bump Avocado version and drop "🥑 enable"

# gpg: Signature made Fri 22 Feb 2019 19:37:07 GMT
# gpg:                using RSA key 657E8D33A5F209F3
# gpg: Good signature from "Cleber Rosa <crosa@redhat.com>" [marginal]
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 7ABB 96EB 8B46 B94D 5E0F  E9BB 657E 8D33 A5F2 09F3

* remotes/cleber/tags/python-next-pull-request:
  Acceptance tests: expect boot to extract 2GiB+ initrd with linux-v4.16
  Acceptance tests: use linux-3.6 and set vm memory to 4GiB
  tests.acceptance: adds simple migration test
  tests.acceptance: adds multi vm capability for acceptance tests
  scripts/qemu.py: log QEMU launch command line
  Introduce a Python module structure
  Acceptance tests: drop usage of "🥑 enable"

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2019-03-07 16:16:02 +00:00
commit 6cb4f6db4f
23 changed files with 193 additions and 40 deletions
Download patch file Download diff file Expand all files Collapse all files

518
python/qemu/__init__.py Normal file
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# QEMU library
#
# Copyright (C) 2015-2016 Red Hat Inc.
# Copyright (C) 2012 IBM Corp.
#
# Authors:
# Fam Zheng <famz@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
#
# Based on qmp.py.
#
import errno
import logging
import os
import subprocess
import re
import shutil
import socket
import tempfile
from . import qmp
LOG = logging.getLogger(__name__)
# Mapping host architecture to any additional architectures it can
# support which often includes its 32 bit cousin.
ADDITIONAL_ARCHES = {
"x86_64" : "i386",
"aarch64" : "armhf"
}
def kvm_available(target_arch=None):
host_arch = os.uname()[4]
if target_arch and target_arch != host_arch:
if target_arch != ADDITIONAL_ARCHES.get(host_arch):
return False
return os.access("/dev/kvm", os.R_OK | os.W_OK)
#: Maps machine types to the preferred console device types
CONSOLE_DEV_TYPES = {
r'^clipper$': 'isa-serial',
r'^malta': 'isa-serial',
r'^(pc.*|q35.*|isapc)$': 'isa-serial',
r'^(40p|powernv|prep)$': 'isa-serial',
r'^pseries.*': 'spapr-vty',
r'^s390-ccw-virtio.*': 'sclpconsole',
}
class QEMUMachineError(Exception):
"""
Exception called when an error in QEMUMachine happens.
"""
class QEMUMachineAddDeviceError(QEMUMachineError):
"""
Exception raised when a request to add a device can not be fulfilled
The failures are caused by limitations, lack of information or conflicting
requests on the QEMUMachine methods. This exception does not represent
failures reported by the QEMU binary itself.
"""
class MonitorResponseError(qmp.QMPError):
"""
Represents erroneous QMP monitor reply
"""
def __init__(self, reply):
try:
desc = reply["error"]["desc"]
except KeyError:
desc = reply
super(MonitorResponseError, self).__init__(desc)
self.reply = reply
class QEMUMachine(object):
"""
A QEMU VM
Use this object as a context manager to ensure the QEMU process terminates::
with VM(binary) as vm:
...
# vm is guaranteed to be shut down here
"""
def __init__(self, binary, args=None, wrapper=None, name=None,
test_dir="/var/tmp", monitor_address=None,
socket_scm_helper=None):
'''
Initialize a QEMUMachine
@param binary: path to the qemu binary
@param args: list of extra arguments
@param wrapper: list of arguments used as prefix to qemu binary
@param name: prefix for socket and log file names (default: qemu-PID)
@param test_dir: where to create socket and log file
@param monitor_address: address for QMP monitor
@param socket_scm_helper: helper program, required for send_fd_scm()
@note: Qemu process is not started until launch() is used.
'''
if args is None:
args = []
if wrapper is None:
wrapper = []
if name is None:
name = "qemu-%d" % os.getpid()
self._name = name
self._monitor_address = monitor_address
self._vm_monitor = None
self._qemu_log_path = None
self._qemu_log_file = None
self._popen = None
self._binary = binary
self._args = list(args) # Force copy args in case we modify them
self._wrapper = wrapper
self._events = []
self._iolog = None
self._socket_scm_helper = socket_scm_helper
self._qmp = None
self._qemu_full_args = None
self._test_dir = test_dir
self._temp_dir = None
self._launched = False
self._machine = None
self._console_device_type = None
self._console_address = None
self._console_socket = None
# just in case logging wasn't configured by the main script:
logging.basicConfig()
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.shutdown()
return False
# This can be used to add an unused monitor instance.
def add_monitor_null(self):
self._args.append('-monitor')
self._args.append('null')
def add_fd(self, fd, fdset, opaque, opts=''):
"""
Pass a file descriptor to the VM
"""
options = ['fd=%d' % fd,
'set=%d' % fdset,
'opaque=%s' % opaque]
if opts:
options.append(opts)
# This did not exist before 3.4, but since then it is
# mandatory for our purpose
if hasattr(os, 'set_inheritable'):
os.set_inheritable(fd, True)
self._args.append('-add-fd')
self._args.append(','.join(options))
return self
# Exactly one of fd and file_path must be given.
# (If it is file_path, the helper will open that file and pass its
# own fd)
def send_fd_scm(self, fd=None, file_path=None):
# In iotest.py, the qmp should always use unix socket.
assert self._qmp.is_scm_available()
if self._socket_scm_helper is None:
raise QEMUMachineError("No path to socket_scm_helper set")
if not os.path.exists(self._socket_scm_helper):
raise QEMUMachineError("%s does not exist" %
self._socket_scm_helper)
# This did not exist before 3.4, but since then it is
# mandatory for our purpose
if hasattr(os, 'set_inheritable'):
os.set_inheritable(self._qmp.get_sock_fd(), True)
if fd is not None:
os.set_inheritable(fd, True)
fd_param = ["%s" % self._socket_scm_helper,
"%d" % self._qmp.get_sock_fd()]
if file_path is not None:
assert fd is None
fd_param.append(file_path)
else:
assert fd is not None
fd_param.append(str(fd))
devnull = open(os.path.devnull, 'rb')
proc = subprocess.Popen(fd_param, stdin=devnull, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT, close_fds=False)
output = proc.communicate()[0]
if output:
LOG.debug(output)
return proc.returncode
@staticmethod
def _remove_if_exists(path):
"""
Remove file object at path if it exists
"""
try:
os.remove(path)
except OSError as exception:
if exception.errno == errno.ENOENT:
return
raise
def is_running(self):
return self._popen is not None and self._popen.poll() is None
def exitcode(self):
if self._popen is None:
return None
return self._popen.poll()
def get_pid(self):
if not self.is_running():
return None
return self._popen.pid
def _load_io_log(self):
if self._qemu_log_path is not None:
with open(self._qemu_log_path, "r") as iolog:
self._iolog = iolog.read()
def _base_args(self):
if isinstance(self._monitor_address, tuple):
moncdev = "socket,id=mon,host=%s,port=%s" % (
self._monitor_address[0],
self._monitor_address[1])
else:
moncdev = 'socket,id=mon,path=%s' % self._vm_monitor
args = ['-chardev', moncdev,
'-mon', 'chardev=mon,mode=control',
'-display', 'none', '-vga', 'none']
if self._machine is not None:
args.extend(['-machine', self._machine])
if self._console_device_type is not None:
self._console_address = os.path.join(self._temp_dir,
self._name + "-console.sock")
chardev = ('socket,id=console,path=%s,server,nowait' %
self._console_address)
device = '%s,chardev=console' % self._console_device_type
args.extend(['-chardev', chardev, '-device', device])
return args
def _pre_launch(self):
self._temp_dir = tempfile.mkdtemp(dir=self._test_dir)
if self._monitor_address is not None:
self._vm_monitor = self._monitor_address
else:
self._vm_monitor = os.path.join(self._temp_dir,
self._name + "-monitor.sock")
self._qemu_log_path = os.path.join(self._temp_dir, self._name + ".log")
self._qemu_log_file = open(self._qemu_log_path, 'wb')
self._qmp = qmp.QEMUMonitorProtocol(self._vm_monitor,
server=True)
def _post_launch(self):
self._qmp.accept()
def _post_shutdown(self):
if self._qemu_log_file is not None:
self._qemu_log_file.close()
self._qemu_log_file = None
self._qemu_log_path = None
if self._console_socket is not None:
self._console_socket.close()
self._console_socket = None
if self._temp_dir is not None:
shutil.rmtree(self._temp_dir)
self._temp_dir = None
def launch(self):
"""
Launch the VM and make sure we cleanup and expose the
command line/output in case of exception
"""
if self._launched:
raise QEMUMachineError('VM already launched')
self._iolog = None
self._qemu_full_args = None
try:
self._launch()
self._launched = True
except:
self.shutdown()
LOG.debug('Error launching VM')
if self._qemu_full_args:
LOG.debug('Command: %r', ' '.join(self._qemu_full_args))
if self._iolog:
LOG.debug('Output: %r', self._iolog)
raise
def _launch(self):
"""
Launch the VM and establish a QMP connection
"""
devnull = open(os.path.devnull, 'rb')
self._pre_launch()
self._qemu_full_args = (self._wrapper + [self._binary] +
self._base_args() + self._args)
LOG.debug('VM launch command: %r', ' '.join(self._qemu_full_args))
self._popen = subprocess.Popen(self._qemu_full_args,
stdin=devnull,
stdout=self._qemu_log_file,
stderr=subprocess.STDOUT,
shell=False,
close_fds=False)
self._post_launch()
def wait(self):
"""
Wait for the VM to power off
"""
self._popen.wait()
self._qmp.close()
self._load_io_log()
self._post_shutdown()
def shutdown(self):
"""
Terminate the VM and clean up
"""
if self.is_running():
try:
self._qmp.cmd('quit')
self._qmp.close()
except:
self._popen.kill()
self._popen.wait()
self._load_io_log()
self._post_shutdown()
exitcode = self.exitcode()
if exitcode is not None and exitcode < 0:
msg = 'qemu received signal %i: %s'
if self._qemu_full_args:
command = ' '.join(self._qemu_full_args)
else:
command = ''
LOG.warn(msg, -exitcode, command)
self._launched = False
def qmp(self, cmd, conv_keys=True, **args):
"""
Invoke a QMP command and return the response dict
"""
qmp_args = dict()
for key, value in args.items():
if conv_keys:
qmp_args[key.replace('_', '-')] = value
else:
qmp_args[key] = value
return self._qmp.cmd(cmd, args=qmp_args)
def command(self, cmd, conv_keys=True, **args):
"""
Invoke a QMP command.
On success return the response dict.
On failure raise an exception.
"""
reply = self.qmp(cmd, conv_keys, **args)
if reply is None:
raise qmp.QMPError("Monitor is closed")
if "error" in reply:
raise MonitorResponseError(reply)
return reply["return"]
def get_qmp_event(self, wait=False):
"""
Poll for one queued QMP events and return it
"""
if len(self._events) > 0:
return self._events.pop(0)
return self._qmp.pull_event(wait=wait)
def get_qmp_events(self, wait=False):
"""
Poll for queued QMP events and return a list of dicts
"""
events = self._qmp.get_events(wait=wait)
events.extend(self._events)
del self._events[:]
self._qmp.clear_events()
return events
def event_wait(self, name, timeout=60.0, match=None):
"""
Wait for specified timeout on named event in QMP; optionally filter
results by match.
The 'match' is checked to be a recursive subset of the 'event'; skips
branch processing on match's value None
{"foo": {"bar": 1}} matches {"foo": None}
{"foo": {"bar": 1}} does not matches {"foo": {"baz": None}}
"""
def event_match(event, match=None):
if match is None:
return True
for key in match:
if key in event:
if isinstance(event[key], dict):
if not event_match(event[key], match[key]):
return False
elif event[key] != match[key]:
return False
else:
return False
return True
# Search cached events
for event in self._events:
if (event['event'] == name) and event_match(event, match):
self._events.remove(event)
return event
# Poll for new events
while True:
event = self._qmp.pull_event(wait=timeout)
if (event['event'] == name) and event_match(event, match):
return event
self._events.append(event)
return None
def get_log(self):
"""
After self.shutdown or failed qemu execution, this returns the output
of the qemu process.
"""
return self._iolog
def add_args(self, *args):
"""
Adds to the list of extra arguments to be given to the QEMU binary
"""
self._args.extend(args)
def set_machine(self, machine_type):
"""
Sets the machine type
If set, the machine type will be added to the base arguments
of the resulting QEMU command line.
"""
self._machine = machine_type
def set_console(self, device_type=None):
"""
Sets the device type for a console device
If set, the console device and a backing character device will
be added to the base arguments of the resulting QEMU command
line.
This is a convenience method that will either use the provided
device type, of if not given, it will used the device type set
on CONSOLE_DEV_TYPES.
The actual setting of command line arguments will be be done at
machine launch time, as it depends on the temporary directory
to be created.
@param device_type: the device type, such as "isa-serial"
@raises: QEMUMachineAddDeviceError if the device type is not given
and can not be determined.
"""
if device_type is None:
if self._machine is None:
raise QEMUMachineAddDeviceError("Can not add a console device:"
" QEMU instance without a "
"defined machine type")
for regex, device in CONSOLE_DEV_TYPES.items():
if re.match(regex, self._machine):
device_type = device
break
if device_type is None:
raise QEMUMachineAddDeviceError("Can not add a console device:"
" no matching console device "
"type definition")
self._console_device_type = device_type
@property
def console_socket(self):
"""
Returns a socket connected to the console
"""
if self._console_socket is None:
self._console_socket = socket.socket(socket.AF_UNIX,
socket.SOCK_STREAM)
self._console_socket.connect(self._console_address)
return self._console_socket

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python/qemu/qmp.py Normal file
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# QEMU Monitor Protocol Python class
#
# Copyright (C) 2009, 2010 Red Hat Inc.
#
# Authors:
# Luiz Capitulino <lcapitulino@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
import json
import errno
import socket
import logging
class QMPError(Exception):
pass
class QMPConnectError(QMPError):
pass
class QMPCapabilitiesError(QMPError):
pass
class QMPTimeoutError(QMPError):
pass
class QEMUMonitorProtocol(object):
#: Logger object for debugging messages
logger = logging.getLogger('QMP')
#: Socket's error class
error = socket.error
#: Socket's timeout
timeout = socket.timeout
def __init__(self, address, server=False):
"""
Create a QEMUMonitorProtocol class.
@param address: QEMU address, can be either a unix socket path (string)
or a tuple in the form ( address, port ) for a TCP
connection
@param server: server mode listens on the socket (bool)
@raise socket.error on socket connection errors
@note No connection is established, this is done by the connect() or
accept() methods
"""
self.__events = []
self.__address = address
self.__sock = self.__get_sock()
self.__sockfile = None
if server:
self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.__sock.bind(self.__address)
self.__sock.listen(1)
def __get_sock(self):
if isinstance(self.__address, tuple):
family = socket.AF_INET
else:
family = socket.AF_UNIX
return socket.socket(family, socket.SOCK_STREAM)
def __negotiate_capabilities(self):
greeting = self.__json_read()
if greeting is None or "QMP" not in greeting:
raise QMPConnectError
# Greeting seems ok, negotiate capabilities
resp = self.cmd('qmp_capabilities')
if "return" in resp:
return greeting
raise QMPCapabilitiesError
def __json_read(self, only_event=False):
while True:
data = self.__sockfile.readline()
if not data:
return
resp = json.loads(data)
if 'event' in resp:
self.logger.debug("<<< %s", resp)
self.__events.append(resp)
if not only_event:
continue
return resp
def __get_events(self, wait=False):
"""
Check for new events in the stream and cache them in __events.
@param wait (bool): block until an event is available.
@param wait (float): If wait is a float, treat it as a timeout value.
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
"""
# Check for new events regardless and pull them into the cache:
self.__sock.setblocking(0)
try:
self.__json_read()
except socket.error as err:
if err[0] == errno.EAGAIN:
# No data available
pass
self.__sock.setblocking(1)
# Wait for new events, if needed.
# if wait is 0.0, this means "no wait" and is also implicitly false.
if not self.__events and wait:
if isinstance(wait, float):
self.__sock.settimeout(wait)
try:
ret = self.__json_read(only_event=True)
except socket.timeout:
raise QMPTimeoutError("Timeout waiting for event")
except:
raise QMPConnectError("Error while reading from socket")
if ret is None:
raise QMPConnectError("Error while reading from socket")
self.__sock.settimeout(None)
def connect(self, negotiate=True):
"""
Connect to the QMP Monitor and perform capabilities negotiation.
@return QMP greeting dict
@raise socket.error on socket connection errors
@raise QMPConnectError if the greeting is not received
@raise QMPCapabilitiesError if fails to negotiate capabilities
"""
self.__sock.connect(self.__address)
self.__sockfile = self.__sock.makefile()
if negotiate:
return self.__negotiate_capabilities()
def accept(self):
"""
Await connection from QMP Monitor and perform capabilities negotiation.
@return QMP greeting dict
@raise socket.error on socket connection errors
@raise QMPConnectError if the greeting is not received
@raise QMPCapabilitiesError if fails to negotiate capabilities
"""
self.__sock.settimeout(15)
self.__sock, _ = self.__sock.accept()
self.__sockfile = self.__sock.makefile()
return self.__negotiate_capabilities()
def cmd_obj(self, qmp_cmd):
"""
Send a QMP command to the QMP Monitor.
@param qmp_cmd: QMP command to be sent as a Python dict
@return QMP response as a Python dict or None if the connection has
been closed
"""
self.logger.debug(">>> %s", qmp_cmd)
try:
self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8'))
except socket.error as err:
if err[0] == errno.EPIPE:
return
raise socket.error(err)
resp = self.__json_read()
self.logger.debug("<<< %s", resp)
return resp
def cmd(self, name, args=None, cmd_id=None):
"""
Build a QMP command and send it to the QMP Monitor.
@param name: command name (string)
@param args: command arguments (dict)
@param cmd_id: command id (dict, list, string or int)
"""
qmp_cmd = {'execute': name}
if args:
qmp_cmd['arguments'] = args
if cmd_id:
qmp_cmd['id'] = cmd_id
return self.cmd_obj(qmp_cmd)
def command(self, cmd, **kwds):
"""
Build and send a QMP command to the monitor, report errors if any
"""
ret = self.cmd(cmd, kwds)
if "error" in ret:
raise Exception(ret['error']['desc'])
return ret['return']
def pull_event(self, wait=False):
"""
Pulls a single event.
@param wait (bool): block until an event is available.
@param wait (float): If wait is a float, treat it as a timeout value.
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
@return The first available QMP event, or None.
"""
self.__get_events(wait)
if self.__events:
return self.__events.pop(0)
return None
def get_events(self, wait=False):
"""
Get a list of available QMP events.
@param wait (bool): block until an event is available.
@param wait (float): If wait is a float, treat it as a timeout value.
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
@return The list of available QMP events.
"""
self.__get_events(wait)
return self.__events
def clear_events(self):
"""
Clear current list of pending events.
"""
self.__events = []
def close(self):
self.__sock.close()
self.__sockfile.close()
def settimeout(self, timeout):
self.__sock.settimeout(timeout)
def get_sock_fd(self):
return self.__sock.fileno()
def is_scm_available(self):
return self.__sock.family == socket.AF_UNIX

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# QEMU qtest library
#
# Copyright (C) 2015 Red Hat Inc.
#
# Authors:
# Fam Zheng <famz@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
#
# Based on qmp.py.
#
import socket
import os
from . import QEMUMachine
class QEMUQtestProtocol(object):
def __init__(self, address, server=False):
"""
Create a QEMUQtestProtocol object.
@param address: QEMU address, can be either a unix socket path (string)
or a tuple in the form ( address, port ) for a TCP
connection
@param server: server mode, listens on the socket (bool)
@raise socket.error on socket connection errors
@note No connection is established, this is done by the connect() or
accept() methods
"""
self._address = address
self._sock = self._get_sock()
self._sockfile = None
if server:
self._sock.bind(self._address)
self._sock.listen(1)
def _get_sock(self):
if isinstance(self._address, tuple):
family = socket.AF_INET
else:
family = socket.AF_UNIX
return socket.socket(family, socket.SOCK_STREAM)
def connect(self):
"""
Connect to the qtest socket.
@raise socket.error on socket connection errors
"""
self._sock.connect(self._address)
self._sockfile = self._sock.makefile()
def accept(self):
"""
Await connection from QEMU.
@raise socket.error on socket connection errors
"""
self._sock, _ = self._sock.accept()
self._sockfile = self._sock.makefile()
def cmd(self, qtest_cmd):
"""
Send a qtest command on the wire.
@param qtest_cmd: qtest command text to be sent
"""
self._sock.sendall((qtest_cmd + "\n").encode('utf-8'))
resp = self._sockfile.readline()
return resp
def close(self):
self._sock.close()
self._sockfile.close()
def settimeout(self, timeout):
self._sock.settimeout(timeout)
class QEMUQtestMachine(QEMUMachine):
'''A QEMU VM'''
def __init__(self, binary, args=None, name=None, test_dir="/var/tmp",
socket_scm_helper=None):
if name is None:
name = "qemu-%d" % os.getpid()
super(QEMUQtestMachine,
self).__init__(binary, args, name=name, test_dir=test_dir,
socket_scm_helper=socket_scm_helper)
self._qtest = None
self._qtest_path = os.path.join(test_dir, name + "-qtest.sock")
def _base_args(self):
args = super(QEMUQtestMachine, self)._base_args()
args.extend(['-qtest', 'unix:path=' + self._qtest_path,
'-machine', 'accel=qtest'])
return args
def _pre_launch(self):
super(QEMUQtestMachine, self)._pre_launch()
self._qtest = QEMUQtestProtocol(self._qtest_path, server=True)
def _post_launch(self):
super(QEMUQtestMachine, self)._post_launch()
self._qtest.accept()
def _post_shutdown(self):
super(QEMUQtestMachine, self)._post_shutdown()
self._remove_if_exists(self._qtest_path)
def qtest(self, cmd):
'''Send a qtest command to guest'''
return self._qtest.cmd(cmd)