tests/qemu-iotests/iotests.py

   1 # Common utilities and Python wrappers for qemu-iotests
   2 #
   3 # Copyright (C) 2012 IBM Corp.
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License
  16 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17 #
  18
  19 import os
  20 import re
  21 import subprocess
  22 import string
  23 import unittest
  24 import sys
  25 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts'))
  26 sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'scripts', 'qmp'))
  27 import qmp
  28 import qtest
  29 import struct
  30
  31 __all__ = ['imgfmt', 'imgproto', 'test_dir' 'qemu_img', 'qemu_io',
  32            'VM', 'QMPTestCase', 'notrun', 'main']
  33
  34 # This will not work if arguments contain spaces but is necessary if we
  35 # want to support the override options that ./check supports.
  36 qemu_img_args = [os.environ.get('QEMU_IMG_PROG', 'qemu-img')]
  37 if os.environ.get('QEMU_IMG_OPTIONS'):
  38     qemu_img_args += os.environ['QEMU_IMG_OPTIONS'].strip().split(' ')
  39
  40 qemu_io_args = [os.environ.get('QEMU_IO_PROG', 'qemu-io')]
  41 if os.environ.get('QEMU_IO_OPTIONS'):
  42     qemu_io_args += os.environ['QEMU_IO_OPTIONS'].strip().split(' ')
  43
  44 qemu_args = [os.environ.get('QEMU_PROG', 'qemu')]
  45 if os.environ.get('QEMU_OPTIONS'):
  46     qemu_args += os.environ['QEMU_OPTIONS'].strip().split(' ')
  47
  48 imgfmt = os.environ.get('IMGFMT', 'raw')
  49 imgproto = os.environ.get('IMGPROTO', 'file')
  50 test_dir = os.environ.get('TEST_DIR', '/var/tmp')
  51 output_dir = os.environ.get('OUTPUT_DIR', '.')
  52 cachemode = os.environ.get('CACHEMODE')
  53 qemu_default_machine = os.environ.get('QEMU_DEFAULT_MACHINE')
  54
  55 socket_scm_helper = os.environ.get('SOCKET_SCM_HELPER', 'socket_scm_helper')
  56
  57 def qemu_img(*args):
  58     '''Run qemu-img and return the exit code'''
  59     devnull = open('/dev/null', 'r+')
  60     exitcode = subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
  61     if exitcode < 0:
  62         sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
  63     return exitcode
  64
  65 def qemu_img_verbose(*args):
  66     '''Run qemu-img without suppressing its output and return the exit code'''
  67     exitcode = subprocess.call(qemu_img_args + list(args))
  68     if exitcode < 0:
  69         sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
  70     return exitcode
  71
  72 def qemu_img_pipe(*args):
  73     '''Run qemu-img and return its output'''
  74     subp = subprocess.Popen(qemu_img_args + list(args), stdout=subprocess.PIPE)
  75     exitcode = subp.wait()
  76     if exitcode < 0:
  77         sys.stderr.write('qemu-img received signal %i: %s\n' % (-exitcode, ' '.join(qemu_img_args + list(args))))
  78     return subp.communicate()[0]
  79
  80 def qemu_io(*args):
  81     '''Run qemu-io and return the stdout data'''
  82     args = qemu_io_args + list(args)
  83     subp = subprocess.Popen(args, stdout=subprocess.PIPE)
  84     exitcode = subp.wait()
  85     if exitcode < 0:
  86         sys.stderr.write('qemu-io received signal %i: %s\n' % (-exitcode, ' '.join(args)))
  87     return subp.communicate()[0]
  88
  89 def compare_images(img1, img2):
  90     '''Return True if two image files are identical'''
  91     return qemu_img('compare', '-f', imgfmt,
  92                     '-F', imgfmt, img1, img2) == 0
  93
  94 def create_image(name, size):
  95     '''Create a fully-allocated raw image with sector markers'''
  96     file = open(name, 'w')
  97     i = 0
  98     while i < size:
  99         sector = struct.pack('>l504xl', i / 512, i / 512)
 100         file.write(sector)
 101         i = i + 512
 102     file.close()
 103
 104 # Test if 'match' is a recursive subset of 'event'
 105 def event_match(event, match=None):
 106     if match is None:
 107         return True
 108
 109     for key in match:
 110         if key in event:
 111             if isinstance(event[key], dict):
 112                 if not event_match(event[key], match[key]):
 113                     return False
 114             elif event[key] != match[key]:
 115                 return False
 116         else:
 117             return False
 118
 119     return True
 120
 121 class VM(object):
 122     '''A QEMU VM'''
 123
 124     def __init__(self):
 125         self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
 126         self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
 127         self._qtest_path = os.path.join(test_dir, 'qemu-qtest.%d' % os.getpid())
 128         self._args = qemu_args + ['-chardev',
 129                      'socket,id=mon,path=' + self._monitor_path,
 130                      '-mon', 'chardev=mon,mode=control',
 131                      '-qtest', 'unix:path=' + self._qtest_path,
 132                      '-machine', 'accel=qtest',
 133                      '-display', 'none', '-vga', 'none']
 134         self._num_drives = 0
 135         self._events = []
 136
 137     # This can be used to add an unused monitor instance.
 138     def add_monitor_telnet(self, ip, port):
 139         args = 'tcp:%s:%d,server,nowait,telnet' % (ip, port)
 140         self._args.append('-monitor')
 141         self._args.append(args)
 142
 143     def add_drive_raw(self, opts):
 144         self._args.append('-drive')
 145         self._args.append(opts)
 146         return self
 147
 148     def add_drive(self, path, opts='', interface='virtio'):
 149         '''Add a virtio-blk drive to the VM'''
 150         options = ['if=%s' % interface,
 151                    'cache=%s' % cachemode,
 152                    'id=drive%d' % self._num_drives]
 153
 154         if path is not None:
 155             options.append('file=%s' % path)
 156             options.append('format=%s' % imgfmt)
 157
 158         if opts:
 159             options.append(opts)
 160
 161         self._args.append('-drive')
 162         self._args.append(','.join(options))
 163         self._num_drives += 1
 164         return self
 165
 166     def pause_drive(self, drive, event=None):
 167         '''Pause drive r/w operations'''
 168         if not event:
 169             self.pause_drive(drive, "read_aio")
 170             self.pause_drive(drive, "write_aio")
 171             return
 172         self.qmp('human-monitor-command',
 173                     command_line='qemu-io %s "break %s bp_%s"' % (drive, event, drive))
 174
 175     def resume_drive(self, drive):
 176         self.qmp('human-monitor-command',
 177                     command_line='qemu-io %s "remove_break bp_%s"' % (drive, drive))
 178
 179     def hmp_qemu_io(self, drive, cmd):
 180         '''Write to a given drive using an HMP command'''
 181         return self.qmp('human-monitor-command',
 182                         command_line='qemu-io %s "%s"' % (drive, cmd))
 183
 184     def add_fd(self, fd, fdset, opaque, opts=''):
 185         '''Pass a file descriptor to the VM'''
 186         options = ['fd=%d' % fd,
 187                    'set=%d' % fdset,
 188                    'opaque=%s' % opaque]
 189         if opts:
 190             options.append(opts)
 191
 192         self._args.append('-add-fd')
 193         self._args.append(','.join(options))
 194         return self
 195
 196     def send_fd_scm(self, fd_file_path):
 197         # In iotest.py, the qmp should always use unix socket.
 198         assert self._qmp.is_scm_available()
 199         bin = socket_scm_helper
 200         if os.path.exists(bin) == False:
 201             print "Scm help program does not present, path '%s'." % bin
 202             return -1
 203         fd_param = ["%s" % bin,
 204                     "%d" % self._qmp.get_sock_fd(),
 205                     "%s" % fd_file_path]
 206         devnull = open('/dev/null', 'rb')
 207         p = subprocess.Popen(fd_param, stdin=devnull, stdout=sys.stdout,
 208                              stderr=sys.stderr)
 209         return p.wait()
 210
 211     def launch(self):
 212         '''Launch the VM and establish a QMP connection'''
 213         devnull = open('/dev/null', 'rb')
 214         qemulog = open(self._qemu_log_path, 'wb')
 215         try:
 216             self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
 217             self._qtest = qtest.QEMUQtestProtocol(self._qtest_path, server=True)
 218             self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
 219                                            stderr=subprocess.STDOUT)
 220             self._qmp.accept()
 221             self._qtest.accept()
 222         except:
 223             os.remove(self._monitor_path)
 224             raise
 225
 226     def shutdown(self):
 227         '''Terminate the VM and clean up'''
 228         if not self._popen is None:
 229             self._qmp.cmd('quit')
 230             exitcode = self._popen.wait()
 231             if exitcode < 0:
 232                 sys.stderr.write('qemu received signal %i: %s\n' % (-exitcode, ' '.join(self._args)))
 233             os.remove(self._monitor_path)
 234             os.remove(self._qtest_path)
 235             os.remove(self._qemu_log_path)
 236             self._popen = None
 237
 238     underscore_to_dash = string.maketrans('_', '-')
 239     def qmp(self, cmd, conv_keys=True, **args):
 240         '''Invoke a QMP command and return the result dict'''
 241         qmp_args = dict()
 242         for k in args.keys():
 243             if conv_keys:
 244                 qmp_args[k.translate(self.underscore_to_dash)] = args[k]
 245             else:
 246                 qmp_args[k] = args[k]
 247
 248         return self._qmp.cmd(cmd, args=qmp_args)
 249
 250     def qtest(self, cmd):
 251         '''Send a qtest command to guest'''
 252         return self._qtest.cmd(cmd)
 253
 254     def get_qmp_event(self, wait=False):
 255         '''Poll for one queued QMP events and return it'''
 256         if len(self._events) > 0:
 257             return self._events.pop(0)
 258         return self._qmp.pull_event(wait=wait)
 259
 260     def get_qmp_events(self, wait=False):
 261         '''Poll for queued QMP events and return a list of dicts'''
 262         events = self._qmp.get_events(wait=wait)
 263         events.extend(self._events)
 264         del self._events[:]
 265         self._qmp.clear_events()
 266         return events
 267
 268     def event_wait(self, name='BLOCK_JOB_COMPLETED', timeout=60.0, match=None):
 269         # Search cached events
 270         for event in self._events:
 271             if (event['event'] == name) and event_match(event, match):
 272                 self._events.remove(event)
 273                 return event
 274
 275         # Poll for new events
 276         while True:
 277             event = self._qmp.pull_event(wait=timeout)
 278             if (event['event'] == name) and event_match(event, match):
 279                 return event
 280             self._events.append(event)
 281
 282         return None
 283
 284 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 285
 286 class QMPTestCase(unittest.TestCase):
 287     '''Abstract base class for QMP test cases'''
 288
 289     def dictpath(self, d, path):
 290         '''Traverse a path in a nested dict'''
 291         for component in path.split('/'):
 292             m = index_re.match(component)
 293             if m:
 294                 component, idx = m.groups()
 295                 idx = int(idx)
 296
 297             if not isinstance(d, dict) or component not in d:
 298                 self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
 299             d = d[component]
 300
 301             if m:
 302                 if not isinstance(d, list):
 303                     self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
 304                 try:
 305                     d = d[idx]
 306                 except IndexError:
 307                     self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
 308         return d
 309
 310     def assert_qmp_absent(self, d, path):
 311         try:
 312             result = self.dictpath(d, path)
 313         except AssertionError:
 314             return
 315         self.fail('path "%s" has value "%s"' % (path, str(result)))
 316
 317     def assert_qmp(self, d, path, value):
 318         '''Assert that the value for a specific path in a QMP dict matches'''
 319         result = self.dictpath(d, path)
 320         self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
 321
 322     def assert_no_active_block_jobs(self):
 323         result = self.vm.qmp('query-block-jobs')
 324         self.assert_qmp(result, 'return', [])
 325
 326     def cancel_and_wait(self, drive='drive0', force=False, resume=False):
 327         '''Cancel a block job and wait for it to finish, returning the event'''
 328         result = self.vm.qmp('block-job-cancel', device=drive, force=force)
 329         self.assert_qmp(result, 'return', {})
 330
 331         if resume:
 332             self.vm.resume_drive(drive)
 333
 334         cancelled = False
 335         result = None
 336         while not cancelled:
 337             for event in self.vm.get_qmp_events(wait=True):
 338                 if event['event'] == 'BLOCK_JOB_COMPLETED' or \
 339                    event['event'] == 'BLOCK_JOB_CANCELLED':
 340                     self.assert_qmp(event, 'data/device', drive)
 341                     result = event
 342                     cancelled = True
 343
 344         self.assert_no_active_block_jobs()
 345         return result
 346
 347     def wait_until_completed(self, drive='drive0', check_offset=True):
 348         '''Wait for a block job to finish, returning the event'''
 349         completed = False
 350         while not completed:
 351             for event in self.vm.get_qmp_events(wait=True):
 352                 if event['event'] == 'BLOCK_JOB_COMPLETED':
 353                     self.assert_qmp(event, 'data/device', drive)
 354                     self.assert_qmp_absent(event, 'data/error')
 355                     if check_offset:
 356                         self.assert_qmp(event, 'data/offset', event['data']['len'])
 357                     completed = True
 358
 359         self.assert_no_active_block_jobs()
 360         return event
 361
 362     def wait_ready(self, drive='drive0'):
 363         '''Wait until a block job BLOCK_JOB_READY event'''
 364         f = {'data': {'type': 'mirror', 'device': drive } }
 365         event = self.vm.event_wait(name='BLOCK_JOB_READY', match=f)
 366
 367     def wait_ready_and_cancel(self, drive='drive0'):
 368         self.wait_ready(drive=drive)
 369         event = self.cancel_and_wait(drive=drive)
 370         self.assertEquals(event['event'], 'BLOCK_JOB_COMPLETED')
 371         self.assert_qmp(event, 'data/type', 'mirror')
 372         self.assert_qmp(event, 'data/offset', event['data']['len'])
 373
 374     def complete_and_wait(self, drive='drive0', wait_ready=True):
 375         '''Complete a block job and wait for it to finish'''
 376         if wait_ready:
 377             self.wait_ready(drive=drive)
 378
 379         result = self.vm.qmp('block-job-complete', device=drive)
 380         self.assert_qmp(result, 'return', {})
 381
 382         event = self.wait_until_completed(drive=drive)
 383         self.assert_qmp(event, 'data/type', 'mirror')
 384
 385 def notrun(reason):
 386     '''Skip this test suite'''
 387     # Each test in qemu-iotests has a number ("seq")
 388     seq = os.path.basename(sys.argv[0])
 389
 390     open('%s/%s.notrun' % (output_dir, seq), 'wb').write(reason + '\n')
 391     print '%s not run: %s' % (seq, reason)
 392     sys.exit(0)
 393
 394 def main(supported_fmts=[], supported_oses=['linux']):
 395     '''Run tests'''
 396
 397     debug = '-d' in sys.argv
 398     verbosity = 1
 399     if supported_fmts and (imgfmt not in supported_fmts):
 400         notrun('not suitable for this image format: %s' % imgfmt)
 401
 402     if True not in [sys.platform.startswith(x) for x in supported_oses]:
 403         notrun('not suitable for this OS: %s' % sys.platform)
 404
 405     # We need to filter out the time taken from the output so that qemu-iotest
 406     # can reliably diff the results against master output.
 407     import StringIO
 408     if debug:
 409         output = sys.stdout
 410         verbosity = 2
 411         sys.argv.remove('-d')
 412     else:
 413         output = StringIO.StringIO()
 414
 415     class MyTestRunner(unittest.TextTestRunner):
 416         def __init__(self, stream=output, descriptions=True, verbosity=verbosity):
 417             unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
 418
 419     # unittest.main() will use sys.exit() so expect a SystemExit exception
 420     try:
 421         unittest.main(testRunner=MyTestRunner)
 422     finally:
 423         if not debug:
 424             sys.stderr.write(re.sub(r'Ran (\d+) tests? in [\d.]+s', r'Ran \1 tests', output.getvalue()))