aboutsummaryrefslogtreecommitdiffstats
path: root/meta/lib/oeqa/utils/qemurunner.py
blob: c3c643d71074ecb94a3c4ab36839b89aaef158e6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
# Copyright (C) 2013 Intel Corporation
#
# Released under the MIT license (see COPYING.MIT)

# This module provides a class for starting qemu images using runqemu.
# It's used by testimage.bbclass.

import subprocess
import os
import sys
import time
import signal
import re
import socket
import select
import errno
import string
import threading
import codecs
import logging
from oeqa.utils.dump import HostDumper

# Get Unicode non printable control chars
control_range = list(range(0,32))+list(range(127,160))
control_chars = [chr(x) for x in control_range
                if chr(x) not in string.printable]
re_control_char = re.compile('[%s]' % re.escape("".join(control_chars)))

class QemuRunner:

    def __init__(self, machine, rootfs, display, tmpdir, deploy_dir_image, logfile, boottime, dump_dir, dump_host_cmds, use_kvm, logger):

        # Popen object for runqemu
        self.runqemu = None
        # pid of the qemu process that runqemu will start
        self.qemupid = None
        # target ip - from the command line or runqemu output
        self.ip = None
        # host ip - where qemu is running
        self.server_ip = None
        # target ip netmask
        self.netmask = None

        self.machine = machine
        self.rootfs = rootfs
        self.display = display
        self.tmpdir = tmpdir
        self.deploy_dir_image = deploy_dir_image
        self.logfile = logfile
        self.boottime = boottime
        self.logged = False
        self.thread = None
        self.use_kvm = use_kvm
        self.msg = ''

        self.runqemutime = 120
        self.qemu_pidfile = 'pidfile_'+str(os.getpid())
        self.host_dumper = HostDumper(dump_host_cmds, dump_dir)

        self.logger = logger

    def create_socket(self):
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            sock.setblocking(0)
            sock.bind(("127.0.0.1",0))
            sock.listen(2)
            port = sock.getsockname()[1]
            self.logger.debug("Created listening socket for qemu serial console on: 127.0.0.1:%s" % port)
            return (sock, port)

        except socket.error:
            sock.close()
            raise

    def log(self, msg):
        if self.logfile:
            # It is needed to sanitize the data received from qemu
            # because is possible to have control characters
            msg = msg.decode("utf-8", errors='ignore')
            msg = re_control_char.sub('', msg)
            self.msg += msg
            with codecs.open(self.logfile, "a", encoding="utf-8") as f:
                f.write("%s" % msg)

    def getOutput(self, o):
        import fcntl
        fl = fcntl.fcntl(o, fcntl.F_GETFL)
        fcntl.fcntl(o, fcntl.F_SETFL, fl | os.O_NONBLOCK)
        return os.read(o.fileno(), 1000000).decode("utf-8")


    def handleSIGCHLD(self, signum, frame):
        if self.runqemu and self.runqemu.poll():
            if self.runqemu.returncode:
                self.logger.debug('runqemu exited with code %d' % self.runqemu.returncode)
                self.logger.debug("Output from runqemu:\n%s" % self.getOutput(self.runqemu.stdout))
                self.stop()
                self._dump_host()
                raise SystemExit

    def start(self, qemuparams = None, get_ip = True, extra_bootparams = None, runqemuparams='', launch_cmd=None, discard_writes=True):
        env = os.environ.copy()
        if self.display:
            env["DISPLAY"] = self.display
            # Set this flag so that Qemu doesn't do any grabs as SDL grabs
            # interact badly with screensavers.
            env["QEMU_DONT_GRAB"] = "1"
        if not os.path.exists(self.rootfs):
            self.logger.error("Invalid rootfs %s" % self.rootfs)
            return False
        if not os.path.exists(self.tmpdir):
            self.logger.error("Invalid TMPDIR path %s" % self.tmpdir)
            return False
        else:
            env["OE_TMPDIR"] = self.tmpdir
        if not os.path.exists(self.deploy_dir_image):
            self.logger.error("Invalid DEPLOY_DIR_IMAGE path %s" % self.deploy_dir_image)
            return False
        else:
            env["DEPLOY_DIR_IMAGE"] = self.deploy_dir_image

        if not launch_cmd:
            launch_cmd = 'runqemu %s %s ' % ('snapshot' if discard_writes else '', runqemuparams)
            if self.use_kvm:
                self.logger.debug('Using kvm for runqemu')
                launch_cmd += ' kvm'
            else:
                self.logger.debug('Not using kvm for runqemu')
            if not self.display:
                launch_cmd += ' nographic'
            launch_cmd += ' %s %s' % (self.machine, self.rootfs)

        return self.launch(launch_cmd, qemuparams=qemuparams, get_ip=get_ip, extra_bootparams=extra_bootparams, env=env)

    def launch(self, launch_cmd, get_ip = True, qemuparams = None, extra_bootparams = None, env = None):
        try:
            threadsock, threadport = self.create_socket()
            self.server_socket, self.serverport = self.create_socket()
        except socket.error as msg:
            self.logger.error("Failed to create listening socket: %s" % msg[1])
            return False

        bootparams = 'console=tty1 console=ttyS0,115200n8 printk.time=1'
        if extra_bootparams:
            bootparams = bootparams + ' ' + extra_bootparams

        # Ask QEMU to store the QEMU process PID in file, this way we don't have to parse running processes
        # and analyze descendents in order to determine it.
        if os.path.exists(self.qemu_pidfile):
            os.remove(self.qemu_pidfile)
        self.qemuparams = 'bootparams="{0}" qemuparams="-serial tcp:127.0.0.1:{1} -pidfile {2}"'.format(bootparams, threadport, self.qemu_pidfile)
        if qemuparams:
            self.qemuparams = self.qemuparams[:-1] + " " + qemuparams + " " + '\"'

        launch_cmd += ' tcpserial=%s %s' % (self.serverport, self.qemuparams)

        self.origchldhandler = signal.getsignal(signal.SIGCHLD)
        signal.signal(signal.SIGCHLD, self.handleSIGCHLD)

        self.logger.debug('launchcmd=%s'%(launch_cmd))

        # FIXME: We pass in stdin=subprocess.PIPE here to work around stty
        # blocking at the end of the runqemu script when using this within
        # oe-selftest (this makes stty error out immediately). There ought
        # to be a proper fix but this will suffice for now.
        self.runqemu = subprocess.Popen(launch_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, stdin=subprocess.PIPE, preexec_fn=os.setpgrp, env=env)
        output = self.runqemu.stdout

        #
        # We need the preexec_fn above so that all runqemu processes can easily be killed
        # (by killing their process group). This presents a problem if this controlling
        # process itself is killed however since those processes don't notice the death
        # of the parent and merrily continue on.
        #
        # Rather than hack runqemu to deal with this, we add something here instead.
        # Basically we fork off another process which holds an open pipe to the parent
        # and also is setpgrp. If/when the pipe sees EOF from the parent dieing, it kills
        # the process group. This is like pctrl's PDEATHSIG but for a process group
        # rather than a single process.
        #
        r, w = os.pipe()
        self.monitorpid = os.fork()
        if self.monitorpid:
            os.close(r)
            self.monitorpipe = os.fdopen(w, "w")
        else:
            # child process
            os.setpgrp()
            os.close(w)
            r = os.fdopen(r)
            x = r.read()
            os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM)
            sys.exit(0)

        self.logger.debug("runqemu started, pid is %s" % self.runqemu.pid)
        self.logger.debug("waiting at most %s seconds for qemu pid (%s)" %
                          (self.runqemutime, time.strftime("%D %H:%M:%S")))
        endtime = time.time() + self.runqemutime
        while not self.is_alive() and time.time() < endtime:
            if self.runqemu.poll():
                if self.runqemu.returncode:
                    # No point waiting any longer
                    self.logger.debug('runqemu exited with code %d' % self.runqemu.returncode)
                    self._dump_host()
                    self.stop()
                    self.logger.debug("Output from runqemu:\n%s" % self.getOutput(output))
                    return False
            time.sleep(0.5)

        if not self.is_alive():
            self.logger.error("Qemu pid didn't appear in %s seconds (%s)" %
                              (self.runqemutime, time.strftime("%D %H:%M:%S")))
            # Dump all processes to help us to figure out what is going on...
            ps = subprocess.Popen(['ps', 'axww', '-o', 'pid,ppid,command '], stdout=subprocess.PIPE).communicate()[0]
            processes = ps.decode("utf-8")
            self.logger.debug("Running processes:\n%s" % processes)
            self._dump_host()
            self.stop()
            op = self.getOutput(output)
            if op:
                self.logger.error("Output from runqemu:\n%s" % op)
            else:
                self.logger.error("No output from runqemu.\n")
            return False

        # We are alive: qemu is running
        out = self.getOutput(output)
        netconf = False # network configuration is not required by default
        self.logger.debug("qemu started in %s seconds - qemu procces pid is %s (%s)" %
                          (time.time() - (endtime - self.runqemutime),
                           self.qemupid, time.strftime("%D %H:%M:%S")))
        if get_ip:
            cmdline = ''
            with open('/proc/%s/cmdline' % self.qemupid) as p:
                cmdline = p.read()
                # It is needed to sanitize the data received
                # because is possible to have control characters
                cmdline = re_control_char.sub(' ', cmdline)
            try:
                ips = re.findall("((?:[0-9]{1,3}\.){3}[0-9]{1,3})", cmdline.split("ip=")[1])
                self.ip = ips[0]
                self.server_ip = ips[1]
                self.logger.debug("qemu cmdline used:\n{}".format(cmdline))
            except (IndexError, ValueError):
                # Try to get network configuration from runqemu output
                match = re.match('.*Network configuration: ([0-9.]+)::([0-9.]+):([0-9.]+)$.*',
                                 out, re.MULTILINE|re.DOTALL)
                if match:
                    self.ip, self.server_ip, self.netmask = match.groups()
                    # network configuration is required as we couldn't get it
                    # from the runqemu command line, so qemu doesn't run kernel
                    # and guest networking is not configured
                    netconf = True
                else:
                    self.logger.error("Couldn't get ip from qemu command line and runqemu output! "
                                 "Here is the qemu command line used:\n%s\n"
                                 "and output from runqemu:\n%s" % (cmdline, out))
                    self._dump_host()
                    self.stop()
                    return False

        self.logger.debug("Target IP: %s" % self.ip)
        self.logger.debug("Server IP: %s" % self.server_ip)

        self.thread = LoggingThread(self.log, threadsock, self.logger)
        self.thread.start()
        if not self.thread.connection_established.wait(self.boottime):
            self.logger.error("Didn't receive a console connection from qemu. "
                         "Here is the qemu command line used:\n%s\nand "
                         "output from runqemu:\n%s" % (cmdline, out))
            self.stop_thread()
            return False

        self.logger.debug("Output from runqemu:\n%s", out)
        self.logger.debug("Waiting at most %d seconds for login banner (%s)" %
                          (self.boottime, time.strftime("%D %H:%M:%S")))
        endtime = time.time() + self.boottime
        socklist = [self.server_socket]
        reachedlogin = False
        stopread = False
        qemusock = None
        bootlog = b''
        data = b''
        while time.time() < endtime and not stopread:
            try:
                sread, swrite, serror = select.select(socklist, [], [], 5)
            except InterruptedError:
                continue
            for sock in sread:
                if sock is self.server_socket:
                    qemusock, addr = self.server_socket.accept()
                    qemusock.setblocking(0)
                    socklist.append(qemusock)
                    socklist.remove(self.server_socket)
                    self.logger.debug("Connection from %s:%s" % addr)
                else:
                    data = data + sock.recv(1024)
                    if data:
                        bootlog += data
                        data = b''
                        if b' login:' in bootlog:
                            self.server_socket = qemusock
                            stopread = True
                            reachedlogin = True
                            self.logger.debug("Reached login banner in %s seconds (%s)" %
                                              (time.time() - (endtime - self.boottime),
                                              time.strftime("%D %H:%M:%S")))
                    else:
                        # no need to check if reachedlogin unless we support multiple connections
                        self.logger.debug("QEMU socket disconnected before login banner reached. (%s)" %
                                          time.strftime("%D %H:%M:%S"))
                        socklist.remove(sock)
                        sock.close()
                        stopread = True


        if not reachedlogin:
            if time.time() >= endtime:
                self.logger.debug("Target didn't reach login banner in %d seconds (%s)" %
                                  (self.boottime, time.strftime("%D %H:%M:%S")))
            tail = lambda l: "\n".join(l.splitlines()[-25:])
            # in case bootlog is empty, use tail qemu log store at self.msg
            lines = tail(bootlog if bootlog else self.msg)
            self.logger.debug("Last 25 lines of text:\n%s" % lines)
            self.logger.debug("Check full boot log: %s" % self.logfile)
            self._dump_host()
            self.stop()
            return False

        # If we are not able to login the tests can continue
        try:
            (status, output) = self.run_serial("root\n", raw=True)
            if re.search("root@[a-zA-Z0-9\-]+:~#", output):
                self.logged = True
                self.logger.debug("Logged as root in serial console")
                if netconf:
                    # configure guest networking
                    cmd = "ifconfig eth0 %s netmask %s up\n" % (self.ip, self.netmask)
                    output = self.run_serial(cmd, raw=True)[1]
                    if re.search("root@[a-zA-Z0-9\-]+:~#", output):
                        self.logger.debug("configured ip address %s", self.ip)
                    else:
                        self.logger.debug("Couldn't configure guest networking")
            else:
                self.logger.debug("Couldn't login into serial console"
                            " as root using blank password")
        except:
            self.logger.debug("Serial console failed while trying to login")
        return True

    def stop(self):
        self.stop_thread()
        self.stop_qemu_system()
        if hasattr(self, "origchldhandler"):
            signal.signal(signal.SIGCHLD, self.origchldhandler)
        if self.runqemu:
            if hasattr(self, "monitorpid"):
                os.kill(self.monitorpid, signal.SIGKILL)
                self.logger.debug("Sending SIGTERM to runqemu")
                try:
                    os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM)
                except OSError as e:
                    if e.errno != errno.ESRCH:
                        raise
            endtime = time.time() + self.runqemutime
            while self.runqemu.poll() is None and time.time() < endtime:
                time.sleep(1)
            if self.runqemu.poll() is None:
                self.logger.debug("Sending SIGKILL to runqemu")
                os.killpg(os.getpgid(self.runqemu.pid), signal.SIGKILL)
            self.runqemu = None
        if hasattr(self, 'server_socket') and self.server_socket:
            self.server_socket.close()
            self.server_socket = None
        self.qemupid = None
        self.ip = None
        if os.path.exists(self.qemu_pidfile):
            os.remove(self.qemu_pidfile)

    def stop_qemu_system(self):
        if self.qemupid:
            try:
                # qemu-system behaves well and a SIGTERM is enough
                os.kill(self.qemupid, signal.SIGTERM)
            except ProcessLookupError as e:
                self.logger.warning('qemu-system ended unexpectedly')

    def stop_thread(self):
        if self.thread and self.thread.is_alive():
            self.thread.stop()
            self.thread.join()

    def restart(self, qemuparams = None):
        self.logger.debug("Restarting qemu process")
        if self.runqemu.poll() is None:
            self.stop()
        if self.start(qemuparams):
            return True
        return False

    def is_alive(self):
        if not self.runqemu or self.runqemu.poll() is not None:
            return False
        if os.path.isfile(self.qemu_pidfile):
            f = open(self.qemu_pidfile, 'r')
            qemu_pid = f.read()
            f.close()
            qemupid = int(qemu_pid)
            if os.path.exists("/proc/" + str(qemupid)):
                self.qemupid = qemupid
                return True
        return False

    def run_serial(self, command, raw=False, timeout=5):
        # We assume target system have echo to get command status
        if not raw:
            command = "%s; echo $?\n" % command

        data = ''
        status = 0
        self.server_socket.sendall(command.encode('utf-8'))
        start = time.time()
        end = start + timeout
        while True:
            now = time.time()
            if now >= end:
                data += "<<< run_serial(): command timed out after %d seconds without output >>>\r\n\r\n" % timeout
                break
            try:
                sread, _, _ = select.select([self.server_socket],[],[], end - now)
            except InterruptedError:
                continue
            if sread:
                answer = self.server_socket.recv(1024)
                if answer:
                    data += answer.decode('utf-8')
                    # Search the prompt to stop
                    if re.search("[a-zA-Z0-9]+@[a-zA-Z0-9\-]+:~#", data):
                        break
                else:
                    raise Exception("No data on serial console socket")

        if data:
            if raw:
                status = 1
            else:
                # Remove first line (command line) and last line (prompt)
                data = data[data.find('$?\r\n')+4:data.rfind('\r\n')]
                index = data.rfind('\r\n')
                if index == -1:
                    status_cmd = data
                    data = ""
                else:
                    status_cmd = data[index+2:]
                    data = data[:index]
                if (status_cmd == "0"):
                    status = 1
        return (status, str(data))


    def _dump_host(self):
        self.host_dumper.create_dir("qemu")
        self.logger.warning("Qemu ended unexpectedly, dump data from host"
                " is in %s" % self.host_dumper.dump_dir)
        self.host_dumper.dump_host()

# This class is for reading data from a socket and passing it to logfunc
# to be processed. It's completely event driven and has a straightforward
# event loop. The mechanism for stopping the thread is a simple pipe which
# will wake up the poll and allow for tearing everything down.
class LoggingThread(threading.Thread):
    def __init__(self, logfunc, sock, logger):
        self.connection_established = threading.Event()
        self.serversock = sock
        self.logfunc = logfunc
        self.logger = logger
        self.readsock = None
        self.running = False

        self.errorevents = select.POLLERR | select.POLLHUP | select.POLLNVAL
        self.readevents = select.POLLIN | select.POLLPRI

        threading.Thread.__init__(self, target=self.threadtarget)

    def threadtarget(self):
        try:
            self.eventloop()
        finally:
            self.teardown()

    def run(self):
        self.logger.debug("Starting logging thread")
        self.readpipe, self.writepipe = os.pipe()
        threading.Thread.run(self)

    def stop(self):
        self.logger.debug("Stopping logging thread")
        if self.running:
            os.write(self.writepipe, bytes("stop", "utf-8"))

    def teardown(self):
        self.logger.debug("Tearing down logging thread")
        self.close_socket(self.serversock)

        if self.readsock is not None:
            self.close_socket(self.readsock)

        self.close_ignore_error(self.readpipe)
        self.close_ignore_error(self.writepipe)
        self.running = False

    def eventloop(self):
        poll = select.poll()
        event_read_mask = self.errorevents | self.readevents
        poll.register(self.serversock.fileno())
        poll.register(self.readpipe, event_read_mask)

        breakout = False
        self.running = True
        self.logger.debug("Starting thread event loop")
        while not breakout:
            events = poll.poll()
            for event in events:
                # An error occurred, bail out
                if event[1] & self.errorevents:
                    raise Exception(self.stringify_event(event[1]))

                # Event to stop the thread
                if self.readpipe == event[0]:
                    self.logger.debug("Stop event received")
                    breakout = True
                    break

                # A connection request was received
                elif self.serversock.fileno() == event[0]:
                    self.logger.debug("Connection request received")
                    self.readsock, _ = self.serversock.accept()
                    self.readsock.setblocking(0)
                    poll.unregister(self.serversock.fileno())
                    poll.register(self.readsock.fileno(), event_read_mask)

                    self.logger.debug("Setting connection established event")
                    self.connection_established.set()

                # Actual data to be logged
                elif self.readsock.fileno() == event[0]:
                    data = self.recv(1024)
                    self.logfunc(data)

    # Since the socket is non-blocking make sure to honor EAGAIN
    # and EWOULDBLOCK.
    def recv(self, count):
        try:
            data = self.readsock.recv(count)
        except socket.error as e:
            if e.errno == errno.EAGAIN or e.errno == errno.EWOULDBLOCK:
                return ''
            else:
                raise

        if data is None:
            raise Exception("No data on read ready socket")
        elif not data:
            # This actually means an orderly shutdown
            # happened. But for this code it counts as an
            # error since the connection shouldn't go away
            # until qemu exits.
            raise Exception("Console connection closed unexpectedly")

        return data

    def stringify_event(self, event):
        val = ''
        if select.POLLERR == event:
            val = 'POLLER'
        elif select.POLLHUP == event:
            val = 'POLLHUP'
        elif select.POLLNVAL == event:
            val = 'POLLNVAL'
        return val

    def close_socket(self, sock):
        sock.shutdown(socket.SHUT_RDWR)
        sock.close()

    def close_ignore_error(self, fd):
        try:
            os.close(fd)
        except OSError:
            pass