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Commit | Line | Data |
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306dfcd6 JS |
1 | """ |
2 | QEMU machine module: | |
3 | ||
4 | The machine module primarily provides the QEMUMachine class, | |
5 | which provides facilities for managing the lifetime of a QEMU VM. | |
6 | """ | |
7 | ||
abf0bf99 JS |
8 | # Copyright (C) 2015-2016 Red Hat Inc. |
9 | # Copyright (C) 2012 IBM Corp. | |
10 | # | |
11 | # Authors: | |
12 | # Fam Zheng <famz@redhat.com> | |
13 | # | |
14 | # This work is licensed under the terms of the GNU GPL, version 2. See | |
15 | # the COPYING file in the top-level directory. | |
16 | # | |
17 | # Based on qmp.py. | |
18 | # | |
19 | ||
20 | import errno | |
aad3f3bb | 21 | from itertools import chain |
abf0bf99 JS |
22 | import logging |
23 | import os | |
abf0bf99 | 24 | import shutil |
de6e08b5 | 25 | import signal |
f12a282f | 26 | import socket |
932ca4bb | 27 | import subprocess |
abf0bf99 | 28 | import tempfile |
1dda0404 | 29 | from types import TracebackType |
aaa81ec6 JS |
30 | from typing import ( |
31 | Any, | |
f12a282f | 32 | BinaryIO, |
aaa81ec6 JS |
33 | Dict, |
34 | List, | |
35 | Optional, | |
aad3f3bb JS |
36 | Sequence, |
37 | Tuple, | |
aaa81ec6 JS |
38 | Type, |
39 | ) | |
932ca4bb JS |
40 | |
41 | from . import console_socket, qmp | |
f12a282f | 42 | from .qmp import QMPMessage, QMPReturnValue, SocketAddrT |
abf0bf99 | 43 | |
abf0bf99 JS |
44 | |
45 | LOG = logging.getLogger(__name__) | |
46 | ||
8dfac2ed | 47 | |
abf0bf99 JS |
48 | class QEMUMachineError(Exception): |
49 | """ | |
50 | Exception called when an error in QEMUMachine happens. | |
51 | """ | |
52 | ||
53 | ||
54 | class QEMUMachineAddDeviceError(QEMUMachineError): | |
55 | """ | |
56 | Exception raised when a request to add a device can not be fulfilled | |
57 | ||
58 | The failures are caused by limitations, lack of information or conflicting | |
59 | requests on the QEMUMachine methods. This exception does not represent | |
60 | failures reported by the QEMU binary itself. | |
61 | """ | |
62 | ||
63 | ||
193bf1c0 JS |
64 | class AbnormalShutdown(QEMUMachineError): |
65 | """ | |
66 | Exception raised when a graceful shutdown was requested, but not performed. | |
67 | """ | |
68 | ||
69 | ||
9b8ccd6d | 70 | class QEMUMachine: |
abf0bf99 | 71 | """ |
f12a282f | 72 | A QEMU VM. |
abf0bf99 | 73 | |
8dfac2ed JS |
74 | Use this object as a context manager to ensure |
75 | the QEMU process terminates:: | |
abf0bf99 JS |
76 | |
77 | with VM(binary) as vm: | |
78 | ... | |
79 | # vm is guaranteed to be shut down here | |
80 | """ | |
81 | ||
aad3f3bb JS |
82 | def __init__(self, |
83 | binary: str, | |
84 | args: Sequence[str] = (), | |
85 | wrapper: Sequence[str] = (), | |
86 | name: Optional[str] = None, | |
2ca6e26c | 87 | base_temp_dir: str = "/var/tmp", |
c4e6023f | 88 | monitor_address: Optional[SocketAddrT] = None, |
f12a282f JS |
89 | socket_scm_helper: Optional[str] = None, |
90 | sock_dir: Optional[str] = None, | |
91 | drain_console: bool = False, | |
92 | console_log: Optional[str] = None): | |
abf0bf99 JS |
93 | ''' |
94 | Initialize a QEMUMachine | |
95 | ||
96 | @param binary: path to the qemu binary | |
97 | @param args: list of extra arguments | |
98 | @param wrapper: list of arguments used as prefix to qemu binary | |
99 | @param name: prefix for socket and log file names (default: qemu-PID) | |
2ca6e26c | 100 | @param base_temp_dir: default location where temporary files are created |
abf0bf99 JS |
101 | @param monitor_address: address for QMP monitor |
102 | @param socket_scm_helper: helper program, required for send_fd_scm() | |
2ca6e26c | 103 | @param sock_dir: where to create socket (defaults to base_temp_dir) |
0fc8f660 | 104 | @param drain_console: (optional) True to drain console socket to buffer |
c5e61a6d | 105 | @param console_log: (optional) path to console log file |
abf0bf99 JS |
106 | @note: Qemu process is not started until launch() is used. |
107 | ''' | |
c5e61a6d JS |
108 | # Direct user configuration |
109 | ||
110 | self._binary = binary | |
c5e61a6d | 111 | self._args = list(args) |
c5e61a6d JS |
112 | self._wrapper = wrapper |
113 | ||
114 | self._name = name or "qemu-%d" % os.getpid() | |
2ca6e26c CR |
115 | self._base_temp_dir = base_temp_dir |
116 | self._sock_dir = sock_dir or self._base_temp_dir | |
c5e61a6d JS |
117 | self._socket_scm_helper = socket_scm_helper |
118 | ||
c4e6023f JS |
119 | if monitor_address is not None: |
120 | self._monitor_address = monitor_address | |
121 | self._remove_monitor_sockfile = False | |
122 | else: | |
123 | self._monitor_address = os.path.join( | |
c5e61a6d | 124 | self._sock_dir, f"{self._name}-monitor.sock" |
c4e6023f JS |
125 | ) |
126 | self._remove_monitor_sockfile = True | |
c5e61a6d JS |
127 | |
128 | self._console_log_path = console_log | |
129 | if self._console_log_path: | |
130 | # In order to log the console, buffering needs to be enabled. | |
131 | self._drain_console = True | |
132 | else: | |
133 | self._drain_console = drain_console | |
134 | ||
135 | # Runstate | |
f12a282f JS |
136 | self._qemu_log_path: Optional[str] = None |
137 | self._qemu_log_file: Optional[BinaryIO] = None | |
9223fda4 | 138 | self._popen: Optional['subprocess.Popen[bytes]'] = None |
f12a282f JS |
139 | self._events: List[QMPMessage] = [] |
140 | self._iolog: Optional[str] = None | |
74b56bb5 | 141 | self._qmp_set = True # Enable QMP monitor by default. |
be1183e5 | 142 | self._qmp_connection: Optional[qmp.QEMUMonitorProtocol] = None |
aad3f3bb | 143 | self._qemu_full_args: Tuple[str, ...] = () |
f12a282f | 144 | self._temp_dir: Optional[str] = None |
abf0bf99 | 145 | self._launched = False |
f12a282f | 146 | self._machine: Optional[str] = None |
746f244d | 147 | self._console_index = 0 |
abf0bf99 | 148 | self._console_set = False |
f12a282f | 149 | self._console_device_type: Optional[str] = None |
652809df JS |
150 | self._console_address = os.path.join( |
151 | self._sock_dir, f"{self._name}-console.sock" | |
152 | ) | |
f12a282f JS |
153 | self._console_socket: Optional[socket.socket] = None |
154 | self._remove_files: List[str] = [] | |
de6e08b5 | 155 | self._user_killed = False |
abf0bf99 | 156 | |
f12a282f | 157 | def __enter__(self) -> 'QEMUMachine': |
abf0bf99 JS |
158 | return self |
159 | ||
1dda0404 JS |
160 | def __exit__(self, |
161 | exc_type: Optional[Type[BaseException]], | |
162 | exc_val: Optional[BaseException], | |
163 | exc_tb: Optional[TracebackType]) -> None: | |
abf0bf99 | 164 | self.shutdown() |
abf0bf99 | 165 | |
f12a282f | 166 | def add_monitor_null(self) -> None: |
306dfcd6 JS |
167 | """ |
168 | This can be used to add an unused monitor instance. | |
169 | """ | |
abf0bf99 JS |
170 | self._args.append('-monitor') |
171 | self._args.append('null') | |
172 | ||
f12a282f JS |
173 | def add_fd(self, fd: int, fdset: int, |
174 | opaque: str, opts: str = '') -> 'QEMUMachine': | |
abf0bf99 JS |
175 | """ |
176 | Pass a file descriptor to the VM | |
177 | """ | |
178 | options = ['fd=%d' % fd, | |
179 | 'set=%d' % fdset, | |
180 | 'opaque=%s' % opaque] | |
181 | if opts: | |
182 | options.append(opts) | |
183 | ||
184 | # This did not exist before 3.4, but since then it is | |
185 | # mandatory for our purpose | |
186 | if hasattr(os, 'set_inheritable'): | |
187 | os.set_inheritable(fd, True) | |
188 | ||
189 | self._args.append('-add-fd') | |
190 | self._args.append(','.join(options)) | |
191 | return self | |
192 | ||
f12a282f JS |
193 | def send_fd_scm(self, fd: Optional[int] = None, |
194 | file_path: Optional[str] = None) -> int: | |
306dfcd6 JS |
195 | """ |
196 | Send an fd or file_path to socket_scm_helper. | |
197 | ||
198 | Exactly one of fd and file_path must be given. | |
199 | If it is file_path, the helper will open that file and pass its own fd. | |
200 | """ | |
abf0bf99 JS |
201 | # In iotest.py, the qmp should always use unix socket. |
202 | assert self._qmp.is_scm_available() | |
203 | if self._socket_scm_helper is None: | |
204 | raise QEMUMachineError("No path to socket_scm_helper set") | |
205 | if not os.path.exists(self._socket_scm_helper): | |
206 | raise QEMUMachineError("%s does not exist" % | |
207 | self._socket_scm_helper) | |
208 | ||
209 | # This did not exist before 3.4, but since then it is | |
210 | # mandatory for our purpose | |
211 | if hasattr(os, 'set_inheritable'): | |
212 | os.set_inheritable(self._qmp.get_sock_fd(), True) | |
213 | if fd is not None: | |
214 | os.set_inheritable(fd, True) | |
215 | ||
216 | fd_param = ["%s" % self._socket_scm_helper, | |
217 | "%d" % self._qmp.get_sock_fd()] | |
218 | ||
219 | if file_path is not None: | |
220 | assert fd is None | |
221 | fd_param.append(file_path) | |
222 | else: | |
223 | assert fd is not None | |
224 | fd_param.append(str(fd)) | |
225 | ||
14b41797 JS |
226 | proc = subprocess.run( |
227 | fd_param, | |
228 | stdin=subprocess.DEVNULL, | |
229 | stdout=subprocess.PIPE, | |
230 | stderr=subprocess.STDOUT, | |
231 | check=False, | |
232 | close_fds=False, | |
8dfac2ed | 233 | ) |
14b41797 JS |
234 | if proc.stdout: |
235 | LOG.debug(proc.stdout) | |
abf0bf99 JS |
236 | |
237 | return proc.returncode | |
238 | ||
239 | @staticmethod | |
f12a282f | 240 | def _remove_if_exists(path: str) -> None: |
abf0bf99 JS |
241 | """ |
242 | Remove file object at path if it exists | |
243 | """ | |
244 | try: | |
245 | os.remove(path) | |
246 | except OSError as exception: | |
247 | if exception.errno == errno.ENOENT: | |
248 | return | |
249 | raise | |
250 | ||
f12a282f | 251 | def is_running(self) -> bool: |
306dfcd6 | 252 | """Returns true if the VM is running.""" |
abf0bf99 JS |
253 | return self._popen is not None and self._popen.poll() is None |
254 | ||
9223fda4 JS |
255 | @property |
256 | def _subp(self) -> 'subprocess.Popen[bytes]': | |
257 | if self._popen is None: | |
258 | raise QEMUMachineError('Subprocess pipe not present') | |
259 | return self._popen | |
260 | ||
f12a282f | 261 | def exitcode(self) -> Optional[int]: |
306dfcd6 | 262 | """Returns the exit code if possible, or None.""" |
abf0bf99 JS |
263 | if self._popen is None: |
264 | return None | |
265 | return self._popen.poll() | |
266 | ||
f12a282f | 267 | def get_pid(self) -> Optional[int]: |
306dfcd6 | 268 | """Returns the PID of the running process, or None.""" |
abf0bf99 JS |
269 | if not self.is_running(): |
270 | return None | |
9223fda4 | 271 | return self._subp.pid |
abf0bf99 | 272 | |
f12a282f | 273 | def _load_io_log(self) -> None: |
abf0bf99 JS |
274 | if self._qemu_log_path is not None: |
275 | with open(self._qemu_log_path, "r") as iolog: | |
276 | self._iolog = iolog.read() | |
277 | ||
652809df JS |
278 | @property |
279 | def _base_args(self) -> List[str]: | |
74b56bb5 | 280 | args = ['-display', 'none', '-vga', 'none'] |
c4e6023f | 281 | |
74b56bb5 WSM |
282 | if self._qmp_set: |
283 | if isinstance(self._monitor_address, tuple): | |
c4e6023f JS |
284 | moncdev = "socket,id=mon,host={},port={}".format( |
285 | *self._monitor_address | |
286 | ) | |
74b56bb5 | 287 | else: |
c4e6023f | 288 | moncdev = f"socket,id=mon,path={self._monitor_address}" |
74b56bb5 WSM |
289 | args.extend(['-chardev', moncdev, '-mon', |
290 | 'chardev=mon,mode=control']) | |
c4e6023f | 291 | |
abf0bf99 JS |
292 | if self._machine is not None: |
293 | args.extend(['-machine', self._machine]) | |
9b8ccd6d | 294 | for _ in range(self._console_index): |
746f244d | 295 | args.extend(['-serial', 'null']) |
abf0bf99 | 296 | if self._console_set: |
991c180d | 297 | chardev = ('socket,id=console,path=%s,server=on,wait=off' % |
abf0bf99 JS |
298 | self._console_address) |
299 | args.extend(['-chardev', chardev]) | |
300 | if self._console_device_type is None: | |
301 | args.extend(['-serial', 'chardev:console']) | |
302 | else: | |
303 | device = '%s,chardev=console' % self._console_device_type | |
304 | args.extend(['-device', device]) | |
305 | return args | |
306 | ||
f12a282f | 307 | def _pre_launch(self) -> None: |
2ca6e26c | 308 | self._qemu_log_path = os.path.join(self.temp_dir, self._name + ".log") |
abf0bf99 | 309 | |
652809df JS |
310 | if self._console_set: |
311 | self._remove_files.append(self._console_address) | |
312 | ||
74b56bb5 | 313 | if self._qmp_set: |
c4e6023f JS |
314 | if self._remove_monitor_sockfile: |
315 | assert isinstance(self._monitor_address, str) | |
316 | self._remove_files.append(self._monitor_address) | |
be1183e5 | 317 | self._qmp_connection = qmp.QEMUMonitorProtocol( |
c4e6023f JS |
318 | self._monitor_address, |
319 | server=True, | |
320 | nickname=self._name | |
321 | ) | |
abf0bf99 | 322 | |
63c33f3c JS |
323 | # NOTE: Make sure any opened resources are *definitely* freed in |
324 | # _post_shutdown()! | |
325 | # pylint: disable=consider-using-with | |
326 | self._qemu_log_file = open(self._qemu_log_path, 'wb') | |
327 | ||
f12a282f | 328 | def _post_launch(self) -> None: |
be1183e5 | 329 | if self._qmp_connection: |
74b56bb5 | 330 | self._qmp.accept() |
abf0bf99 | 331 | |
f12a282f | 332 | def _post_shutdown(self) -> None: |
a3842cb0 JS |
333 | """ |
334 | Called to cleanup the VM instance after the process has exited. | |
335 | May also be called after a failed launch. | |
336 | """ | |
337 | # Comprehensive reset for the failed launch case: | |
338 | self._early_cleanup() | |
339 | ||
be1183e5 | 340 | if self._qmp_connection: |
671940e6 | 341 | self._qmp.close() |
be1183e5 | 342 | self._qmp_connection = None |
671940e6 | 343 | |
abf0bf99 JS |
344 | if self._qemu_log_file is not None: |
345 | self._qemu_log_file.close() | |
346 | self._qemu_log_file = None | |
347 | ||
3c1e16c6 CR |
348 | self._load_io_log() |
349 | ||
abf0bf99 JS |
350 | self._qemu_log_path = None |
351 | ||
abf0bf99 JS |
352 | if self._temp_dir is not None: |
353 | shutil.rmtree(self._temp_dir) | |
354 | self._temp_dir = None | |
355 | ||
32558ce7 HR |
356 | while len(self._remove_files) > 0: |
357 | self._remove_if_exists(self._remove_files.pop()) | |
358 | ||
14661d93 | 359 | exitcode = self.exitcode() |
de6e08b5 JS |
360 | if (exitcode is not None and exitcode < 0 |
361 | and not (self._user_killed and exitcode == -signal.SIGKILL)): | |
14661d93 JS |
362 | msg = 'qemu received signal %i; command: "%s"' |
363 | if self._qemu_full_args: | |
364 | command = ' '.join(self._qemu_full_args) | |
365 | else: | |
366 | command = '' | |
367 | LOG.warning(msg, -int(exitcode), command) | |
368 | ||
de6e08b5 | 369 | self._user_killed = False |
14661d93 JS |
370 | self._launched = False |
371 | ||
f12a282f | 372 | def launch(self) -> None: |
abf0bf99 JS |
373 | """ |
374 | Launch the VM and make sure we cleanup and expose the | |
375 | command line/output in case of exception | |
376 | """ | |
377 | ||
378 | if self._launched: | |
379 | raise QEMUMachineError('VM already launched') | |
380 | ||
381 | self._iolog = None | |
aad3f3bb | 382 | self._qemu_full_args = () |
abf0bf99 JS |
383 | try: |
384 | self._launch() | |
385 | self._launched = True | |
386 | except: | |
a3842cb0 | 387 | self._post_shutdown() |
abf0bf99 JS |
388 | |
389 | LOG.debug('Error launching VM') | |
390 | if self._qemu_full_args: | |
391 | LOG.debug('Command: %r', ' '.join(self._qemu_full_args)) | |
392 | if self._iolog: | |
393 | LOG.debug('Output: %r', self._iolog) | |
394 | raise | |
395 | ||
f12a282f | 396 | def _launch(self) -> None: |
abf0bf99 JS |
397 | """ |
398 | Launch the VM and establish a QMP connection | |
399 | """ | |
abf0bf99 | 400 | self._pre_launch() |
aad3f3bb JS |
401 | self._qemu_full_args = tuple( |
402 | chain(self._wrapper, | |
403 | [self._binary], | |
404 | self._base_args, | |
405 | self._args) | |
406 | ) | |
abf0bf99 JS |
407 | LOG.debug('VM launch command: %r', ' '.join(self._qemu_full_args)) |
408 | self._popen = subprocess.Popen(self._qemu_full_args, | |
07b71233 | 409 | stdin=subprocess.DEVNULL, |
abf0bf99 JS |
410 | stdout=self._qemu_log_file, |
411 | stderr=subprocess.STDOUT, | |
412 | shell=False, | |
413 | close_fds=False) | |
414 | self._post_launch() | |
415 | ||
e2c97f16 JS |
416 | def _early_cleanup(self) -> None: |
417 | """ | |
418 | Perform any cleanup that needs to happen before the VM exits. | |
a3842cb0 | 419 | |
193bf1c0 | 420 | May be invoked by both soft and hard shutdown in failover scenarios. |
a3842cb0 | 421 | Called additionally by _post_shutdown for comprehensive cleanup. |
e2c97f16 JS |
422 | """ |
423 | # If we keep the console socket open, we may deadlock waiting | |
424 | # for QEMU to exit, while QEMU is waiting for the socket to | |
425 | # become writeable. | |
426 | if self._console_socket is not None: | |
427 | self._console_socket.close() | |
428 | self._console_socket = None | |
429 | ||
193bf1c0 JS |
430 | def _hard_shutdown(self) -> None: |
431 | """ | |
432 | Perform early cleanup, kill the VM, and wait for it to terminate. | |
433 | ||
434 | :raise subprocess.Timeout: When timeout is exceeds 60 seconds | |
435 | waiting for the QEMU process to terminate. | |
436 | """ | |
437 | self._early_cleanup() | |
9223fda4 JS |
438 | self._subp.kill() |
439 | self._subp.wait(timeout=60) | |
193bf1c0 | 440 | |
8226a4b8 JS |
441 | def _soft_shutdown(self, timeout: Optional[int], |
442 | has_quit: bool = False) -> None: | |
193bf1c0 JS |
443 | """ |
444 | Perform early cleanup, attempt to gracefully shut down the VM, and wait | |
445 | for it to terminate. | |
446 | ||
8226a4b8 JS |
447 | :param timeout: Timeout in seconds for graceful shutdown. |
448 | A value of None is an infinite wait. | |
193bf1c0 | 449 | :param has_quit: When True, don't attempt to issue 'quit' QMP command |
193bf1c0 JS |
450 | |
451 | :raise ConnectionReset: On QMP communication errors | |
452 | :raise subprocess.TimeoutExpired: When timeout is exceeded waiting for | |
453 | the QEMU process to terminate. | |
454 | """ | |
455 | self._early_cleanup() | |
456 | ||
be1183e5 | 457 | if self._qmp_connection: |
193bf1c0 JS |
458 | if not has_quit: |
459 | # Might raise ConnectionReset | |
460 | self._qmp.cmd('quit') | |
461 | ||
462 | # May raise subprocess.TimeoutExpired | |
9223fda4 | 463 | self._subp.wait(timeout=timeout) |
193bf1c0 | 464 | |
8226a4b8 JS |
465 | def _do_shutdown(self, timeout: Optional[int], |
466 | has_quit: bool = False) -> None: | |
193bf1c0 JS |
467 | """ |
468 | Attempt to shutdown the VM gracefully; fallback to a hard shutdown. | |
469 | ||
8226a4b8 JS |
470 | :param timeout: Timeout in seconds for graceful shutdown. |
471 | A value of None is an infinite wait. | |
193bf1c0 | 472 | :param has_quit: When True, don't attempt to issue 'quit' QMP command |
193bf1c0 JS |
473 | |
474 | :raise AbnormalShutdown: When the VM could not be shut down gracefully. | |
475 | The inner exception will likely be ConnectionReset or | |
476 | subprocess.TimeoutExpired. In rare cases, non-graceful termination | |
477 | may result in its own exceptions, likely subprocess.TimeoutExpired. | |
478 | """ | |
479 | try: | |
8226a4b8 | 480 | self._soft_shutdown(timeout, has_quit) |
193bf1c0 JS |
481 | except Exception as exc: |
482 | self._hard_shutdown() | |
483 | raise AbnormalShutdown("Could not perform graceful shutdown") \ | |
484 | from exc | |
485 | ||
c9b3045b JS |
486 | def shutdown(self, has_quit: bool = False, |
487 | hard: bool = False, | |
8226a4b8 | 488 | timeout: Optional[int] = 30) -> None: |
abf0bf99 | 489 | """ |
193bf1c0 JS |
490 | Terminate the VM (gracefully if possible) and perform cleanup. |
491 | Cleanup will always be performed. | |
492 | ||
493 | If the VM has not yet been launched, or shutdown(), wait(), or kill() | |
494 | have already been called, this method does nothing. | |
495 | ||
496 | :param has_quit: When true, do not attempt to issue 'quit' QMP command. | |
497 | :param hard: When true, do not attempt graceful shutdown, and | |
498 | suppress the SIGKILL warning log message. | |
499 | :param timeout: Optional timeout in seconds for graceful shutdown. | |
8226a4b8 | 500 | Default 30 seconds, A `None` value is an infinite wait. |
abf0bf99 | 501 | """ |
a3842cb0 JS |
502 | if not self._launched: |
503 | return | |
504 | ||
193bf1c0 | 505 | try: |
e0e925a6 | 506 | if hard: |
de6e08b5 | 507 | self._user_killed = True |
193bf1c0 JS |
508 | self._hard_shutdown() |
509 | else: | |
8226a4b8 | 510 | self._do_shutdown(timeout, has_quit) |
193bf1c0 JS |
511 | finally: |
512 | self._post_shutdown() | |
abf0bf99 | 513 | |
f12a282f | 514 | def kill(self) -> None: |
193bf1c0 JS |
515 | """ |
516 | Terminate the VM forcefully, wait for it to exit, and perform cleanup. | |
517 | """ | |
e0e925a6 VSO |
518 | self.shutdown(hard=True) |
519 | ||
8226a4b8 | 520 | def wait(self, timeout: Optional[int] = 30) -> None: |
89528059 JS |
521 | """ |
522 | Wait for the VM to power off and perform post-shutdown cleanup. | |
523 | ||
8226a4b8 JS |
524 | :param timeout: Optional timeout in seconds. Default 30 seconds. |
525 | A value of `None` is an infinite wait. | |
89528059 JS |
526 | """ |
527 | self.shutdown(has_quit=True, timeout=timeout) | |
528 | ||
f12a282f | 529 | def set_qmp_monitor(self, enabled: bool = True) -> None: |
74b56bb5 WSM |
530 | """ |
531 | Set the QMP monitor. | |
532 | ||
533 | @param enabled: if False, qmp monitor options will be removed from | |
534 | the base arguments of the resulting QEMU command | |
535 | line. Default is True. | |
536 | @note: call this function before launch(). | |
537 | """ | |
be1183e5 JS |
538 | self._qmp_set = enabled |
539 | ||
540 | @property | |
541 | def _qmp(self) -> qmp.QEMUMonitorProtocol: | |
542 | if self._qmp_connection is None: | |
543 | raise QEMUMachineError("Attempt to access QMP with no connection") | |
544 | return self._qmp_connection | |
74b56bb5 | 545 | |
aaa81ec6 JS |
546 | @classmethod |
547 | def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]: | |
abf0bf99 JS |
548 | qmp_args = dict() |
549 | for key, value in args.items(): | |
aaa81ec6 | 550 | if _conv_keys: |
abf0bf99 JS |
551 | qmp_args[key.replace('_', '-')] = value |
552 | else: | |
553 | qmp_args[key] = value | |
aaa81ec6 | 554 | return qmp_args |
abf0bf99 | 555 | |
aaa81ec6 JS |
556 | def qmp(self, cmd: str, |
557 | conv_keys: bool = True, | |
558 | **args: Any) -> QMPMessage: | |
559 | """ | |
560 | Invoke a QMP command and return the response dict | |
561 | """ | |
562 | qmp_args = self._qmp_args(conv_keys, **args) | |
abf0bf99 JS |
563 | return self._qmp.cmd(cmd, args=qmp_args) |
564 | ||
f12a282f JS |
565 | def command(self, cmd: str, |
566 | conv_keys: bool = True, | |
567 | **args: Any) -> QMPReturnValue: | |
abf0bf99 JS |
568 | """ |
569 | Invoke a QMP command. | |
570 | On success return the response dict. | |
571 | On failure raise an exception. | |
572 | """ | |
aaa81ec6 JS |
573 | qmp_args = self._qmp_args(conv_keys, **args) |
574 | return self._qmp.command(cmd, **qmp_args) | |
abf0bf99 | 575 | |
f12a282f | 576 | def get_qmp_event(self, wait: bool = False) -> Optional[QMPMessage]: |
abf0bf99 JS |
577 | """ |
578 | Poll for one queued QMP events and return it | |
579 | """ | |
306dfcd6 | 580 | if self._events: |
abf0bf99 JS |
581 | return self._events.pop(0) |
582 | return self._qmp.pull_event(wait=wait) | |
583 | ||
f12a282f | 584 | def get_qmp_events(self, wait: bool = False) -> List[QMPMessage]: |
abf0bf99 JS |
585 | """ |
586 | Poll for queued QMP events and return a list of dicts | |
587 | """ | |
588 | events = self._qmp.get_events(wait=wait) | |
589 | events.extend(self._events) | |
590 | del self._events[:] | |
591 | self._qmp.clear_events() | |
592 | return events | |
593 | ||
594 | @staticmethod | |
f12a282f | 595 | def event_match(event: Any, match: Optional[Any]) -> bool: |
abf0bf99 JS |
596 | """ |
597 | Check if an event matches optional match criteria. | |
598 | ||
599 | The match criteria takes the form of a matching subdict. The event is | |
600 | checked to be a superset of the subdict, recursively, with matching | |
601 | values whenever the subdict values are not None. | |
602 | ||
603 | This has a limitation that you cannot explicitly check for None values. | |
604 | ||
605 | Examples, with the subdict queries on the left: | |
606 | - None matches any object. | |
607 | - {"foo": None} matches {"foo": {"bar": 1}} | |
608 | - {"foo": None} matches {"foo": 5} | |
609 | - {"foo": {"abc": None}} does not match {"foo": {"bar": 1}} | |
610 | - {"foo": {"rab": 2}} matches {"foo": {"bar": 1, "rab": 2}} | |
611 | """ | |
612 | if match is None: | |
613 | return True | |
614 | ||
615 | try: | |
616 | for key in match: | |
617 | if key in event: | |
618 | if not QEMUMachine.event_match(event[key], match[key]): | |
619 | return False | |
620 | else: | |
621 | return False | |
622 | return True | |
623 | except TypeError: | |
624 | # either match or event wasn't iterable (not a dict) | |
f12a282f | 625 | return bool(match == event) |
abf0bf99 | 626 | |
f12a282f JS |
627 | def event_wait(self, name: str, |
628 | timeout: float = 60.0, | |
629 | match: Optional[QMPMessage] = None) -> Optional[QMPMessage]: | |
abf0bf99 JS |
630 | """ |
631 | event_wait waits for and returns a named event from QMP with a timeout. | |
632 | ||
633 | name: The event to wait for. | |
634 | timeout: QEMUMonitorProtocol.pull_event timeout parameter. | |
635 | match: Optional match criteria. See event_match for details. | |
636 | """ | |
637 | return self.events_wait([(name, match)], timeout) | |
638 | ||
f12a282f JS |
639 | def events_wait(self, |
640 | events: Sequence[Tuple[str, Any]], | |
641 | timeout: float = 60.0) -> Optional[QMPMessage]: | |
abf0bf99 | 642 | """ |
1847a4a8 JS |
643 | events_wait waits for and returns a single named event from QMP. |
644 | In the case of multiple qualifying events, this function returns the | |
645 | first one. | |
abf0bf99 | 646 | |
1847a4a8 JS |
647 | :param events: A sequence of (name, match_criteria) tuples. |
648 | The match criteria are optional and may be None. | |
649 | See event_match for details. | |
650 | :param timeout: Optional timeout, in seconds. | |
651 | See QEMUMonitorProtocol.pull_event. | |
652 | ||
653 | :raise QMPTimeoutError: If timeout was non-zero and no matching events | |
654 | were found. | |
655 | :return: A QMP event matching the filter criteria. | |
656 | If timeout was 0 and no event matched, None. | |
abf0bf99 | 657 | """ |
f12a282f | 658 | def _match(event: QMPMessage) -> bool: |
abf0bf99 | 659 | for name, match in events: |
306dfcd6 | 660 | if event['event'] == name and self.event_match(event, match): |
abf0bf99 JS |
661 | return True |
662 | return False | |
663 | ||
1847a4a8 JS |
664 | event: Optional[QMPMessage] |
665 | ||
abf0bf99 JS |
666 | # Search cached events |
667 | for event in self._events: | |
668 | if _match(event): | |
669 | self._events.remove(event) | |
670 | return event | |
671 | ||
672 | # Poll for new events | |
673 | while True: | |
674 | event = self._qmp.pull_event(wait=timeout) | |
1847a4a8 JS |
675 | if event is None: |
676 | # NB: None is only returned when timeout is false-ish. | |
677 | # Timeouts raise QMPTimeoutError instead! | |
678 | break | |
abf0bf99 JS |
679 | if _match(event): |
680 | return event | |
681 | self._events.append(event) | |
682 | ||
683 | return None | |
684 | ||
f12a282f | 685 | def get_log(self) -> Optional[str]: |
abf0bf99 JS |
686 | """ |
687 | After self.shutdown or failed qemu execution, this returns the output | |
688 | of the qemu process. | |
689 | """ | |
690 | return self._iolog | |
691 | ||
f12a282f | 692 | def add_args(self, *args: str) -> None: |
abf0bf99 JS |
693 | """ |
694 | Adds to the list of extra arguments to be given to the QEMU binary | |
695 | """ | |
696 | self._args.extend(args) | |
697 | ||
f12a282f | 698 | def set_machine(self, machine_type: str) -> None: |
abf0bf99 JS |
699 | """ |
700 | Sets the machine type | |
701 | ||
702 | If set, the machine type will be added to the base arguments | |
703 | of the resulting QEMU command line. | |
704 | """ | |
705 | self._machine = machine_type | |
706 | ||
f12a282f JS |
707 | def set_console(self, |
708 | device_type: Optional[str] = None, | |
709 | console_index: int = 0) -> None: | |
abf0bf99 JS |
710 | """ |
711 | Sets the device type for a console device | |
712 | ||
713 | If set, the console device and a backing character device will | |
714 | be added to the base arguments of the resulting QEMU command | |
715 | line. | |
716 | ||
717 | This is a convenience method that will either use the provided | |
718 | device type, or default to a "-serial chardev:console" command | |
719 | line argument. | |
720 | ||
721 | The actual setting of command line arguments will be be done at | |
722 | machine launch time, as it depends on the temporary directory | |
723 | to be created. | |
724 | ||
725 | @param device_type: the device type, such as "isa-serial". If | |
726 | None is given (the default value) a "-serial | |
727 | chardev:console" command line argument will | |
728 | be used instead, resorting to the machine's | |
729 | default device type. | |
746f244d PMD |
730 | @param console_index: the index of the console device to use. |
731 | If not zero, the command line will create | |
732 | 'index - 1' consoles and connect them to | |
733 | the 'null' backing character device. | |
abf0bf99 JS |
734 | """ |
735 | self._console_set = True | |
736 | self._console_device_type = device_type | |
746f244d | 737 | self._console_index = console_index |
abf0bf99 JS |
738 | |
739 | @property | |
f12a282f | 740 | def console_socket(self) -> socket.socket: |
abf0bf99 JS |
741 | """ |
742 | Returns a socket connected to the console | |
743 | """ | |
744 | if self._console_socket is None: | |
80ded8e9 RF |
745 | self._console_socket = console_socket.ConsoleSocket( |
746 | self._console_address, | |
747 | file=self._console_log_path, | |
748 | drain=self._drain_console) | |
abf0bf99 | 749 | return self._console_socket |
2ca6e26c CR |
750 | |
751 | @property | |
752 | def temp_dir(self) -> str: | |
753 | """ | |
754 | Returns a temporary directory to be used for this machine | |
755 | """ | |
756 | if self._temp_dir is None: | |
757 | self._temp_dir = tempfile.mkdtemp(prefix="qemu-machine-", | |
758 | dir=self._base_temp_dir) | |
759 | return self._temp_dir |