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 or path 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', 'qemu-img').strip().split(' ')
  37 qemu_io_args = os.environ.get('QEMU_IO', 'qemu-io').strip().split(' ')
  38 qemu_args = os.environ.get('QEMU', 'qemu').strip().split(' ')
  39
  40 imgfmt = os.environ.get('IMGFMT', 'raw')
  41 imgproto = os.environ.get('IMGPROTO', 'file')
  42 test_dir = os.environ.get('TEST_DIR', '/var/tmp')
  43 output_dir = os.environ.get('OUTPUT_DIR', '.')
  44 cachemode = os.environ.get('CACHEMODE')
  45
  46 socket_scm_helper = os.environ.get('SOCKET_SCM_HELPER', 'socket_scm_helper')
  47
  48 def qemu_img(*args):
  49     '''Run qemu-img and return the exit code'''
  50     devnull = open('/dev/null', 'r+')
  51     return subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
  52
  53 def qemu_img_verbose(*args):
  54     '''Run qemu-img without suppressing its output and return the exit code'''
  55     return subprocess.call(qemu_img_args + list(args))
  56
  57 def qemu_img_pipe(*args):
  58     '''Run qemu-img and return its output'''
  59     return subprocess.Popen(qemu_img_args + list(args), stdout=subprocess.PIPE).communicate()[0]
  60
  61 def qemu_io(*args):
  62     '''Run qemu-io and return the stdout data'''
  63     args = qemu_io_args + list(args)
  64     return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0]
  65
  66 def compare_images(img1, img2):
  67     '''Return True if two image files are identical'''
  68     return qemu_img('compare', '-f', imgfmt,
  69                     '-F', imgfmt, img1, img2) == 0
  70
  71 def create_image(name, size):
  72     '''Create a fully-allocated raw image with sector markers'''
  73     file = open(name, 'w')
  74     i = 0
  75     while i < size:
  76         sector = struct.pack('>l504xl', i / 512, i / 512)
  77         file.write(sector)
  78         i = i + 512
  79     file.close()
  80
  81 # Test if 'match' is a recursive subset of 'event'
  82 def event_match(event, match=None):
  83     if match is None:
  84         return True
  85
  86     for key in match:
  87         if key in event:
  88             if isinstance(event[key], dict):
  89                 if not event_match(event[key], match[key]):
  90                     return False
  91             elif event[key] != match[key]:
  92                 return False
  93         else:
  94             return False
  95
  96     return True
  97
  98 class VM(object):
  99     '''A QEMU VM'''
 100
 101     def __init__(self):
 102         self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
 103         self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
 104         self._qtest_path = os.path.join(test_dir, 'qemu-qtest.%d' % os.getpid())
 105         self._args = qemu_args + ['-chardev',
 106                      'socket,id=mon,path=' + self._monitor_path,
 107                      '-mon', 'chardev=mon,mode=control',
 108                      '-qtest', 'unix:path=' + self._qtest_path,
 109                      '-machine', 'accel=qtest',
 110                      '-display', 'none', '-vga', 'none']
 111         self._num_drives = 0
 112         self._events = []
 113
 114     # This can be used to add an unused monitor instance.
 115     def add_monitor_telnet(self, ip, port):
 116         args = 'tcp:%s:%d,server,nowait,telnet' % (ip, port)
 117         self._args.append('-monitor')
 118         self._args.append(args)
 119
 120     def add_drive(self, path, opts=''):
 121         '''Add a virtio-blk drive to the VM'''
 122         options = ['if=virtio',
 123                    'format=%s' % imgfmt,
 124                    'cache=%s' % cachemode,
 125                    'file=%s' % path,
 126                    'id=drive%d' % self._num_drives]
 127         if opts:
 128             options.append(opts)
 129
 130         self._args.append('-drive')
 131         self._args.append(','.join(options))
 132         self._num_drives += 1
 133         return self
 134
 135     def pause_drive(self, drive, event=None):
 136         '''Pause drive r/w operations'''
 137         if not event:
 138             self.pause_drive(drive, "read_aio")
 139             self.pause_drive(drive, "write_aio")
 140             return
 141         self.qmp('human-monitor-command',
 142                     command_line='qemu-io %s "break %s bp_%s"' % (drive, event, drive))
 143
 144     def resume_drive(self, drive):
 145         self.qmp('human-monitor-command',
 146                     command_line='qemu-io %s "remove_break bp_%s"' % (drive, drive))
 147
 148     def hmp_qemu_io(self, drive, cmd):
 149         '''Write to a given drive using an HMP command'''
 150         return self.qmp('human-monitor-command',
 151                         command_line='qemu-io %s "%s"' % (drive, cmd))
 152
 153     def add_fd(self, fd, fdset, opaque, opts=''):
 154         '''Pass a file descriptor to the VM'''
 155         options = ['fd=%d' % fd,
 156                    'set=%d' % fdset,
 157                    'opaque=%s' % opaque]
 158         if opts:
 159             options.append(opts)
 160
 161         self._args.append('-add-fd')
 162         self._args.append(','.join(options))
 163         return self
 164
 165     def send_fd_scm(self, fd_file_path):
 166         # In iotest.py, the qmp should always use unix socket.
 167         assert self._qmp.is_scm_available()
 168         bin = socket_scm_helper
 169         if os.path.exists(bin) == False:
 170             print "Scm help program does not present, path '%s'." % bin
 171             return -1
 172         fd_param = ["%s" % bin,
 173                     "%d" % self._qmp.get_sock_fd(),
 174                     "%s" % fd_file_path]
 175         devnull = open('/dev/null', 'rb')
 176         p = subprocess.Popen(fd_param, stdin=devnull, stdout=sys.stdout,
 177                              stderr=sys.stderr)
 178         return p.wait()
 179
 180     def launch(self):
 181         '''Launch the VM and establish a QMP connection'''
 182         devnull = open('/dev/null', 'rb')
 183         qemulog = open(self._qemu_log_path, 'wb')
 184         try:
 185             self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
 186             self._qtest = qtest.QEMUQtestProtocol(self._qtest_path, server=True)
 187             self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
 188                                            stderr=subprocess.STDOUT)
 189             self._qmp.accept()
 190             self._qtest.accept()
 191         except:
 192             os.remove(self._monitor_path)
 193             raise
 194
 195     def shutdown(self):
 196         '''Terminate the VM and clean up'''
 197         if not self._popen is None:
 198             self._qmp.cmd('quit')
 199             self._popen.wait()
 200             os.remove(self._monitor_path)
 201             os.remove(self._qtest_path)
 202             os.remove(self._qemu_log_path)
 203             self._popen = None
 204
 205     underscore_to_dash = string.maketrans('_', '-')
 206     def qmp(self, cmd, conv_keys=True, **args):
 207         '''Invoke a QMP command and return the result dict'''
 208         qmp_args = dict()
 209         for k in args.keys():
 210             if conv_keys:
 211                 qmp_args[k.translate(self.underscore_to_dash)] = args[k]
 212             else:
 213                 qmp_args[k] = args[k]
 214
 215         return self._qmp.cmd(cmd, args=qmp_args)
 216
 217     def qtest(self, cmd):
 218         '''Send a qtest command to guest'''
 219         return self._qtest.cmd(cmd)
 220
 221     def get_qmp_event(self, wait=False):
 222         '''Poll for one queued QMP events and return it'''
 223         if len(self._events) > 0:
 224             return self._events.pop(0)
 225         return self._qmp.pull_event(wait=wait)
 226
 227     def get_qmp_events(self, wait=False):
 228         '''Poll for queued QMP events and return a list of dicts'''
 229         events = self._qmp.get_events(wait=wait)
 230         events.extend(self._events)
 231         del self._events[:]
 232         self._qmp.clear_events()
 233         return events
 234
 235     def event_wait(self, name='BLOCK_JOB_COMPLETED', timeout=60.0, match=None):
 236         # Search cached events
 237         for event in self._events:
 238             if (event['event'] == name) and event_match(event, match):
 239                 self._events.remove(event)
 240                 return event
 241
 242         # Poll for new events
 243         while True:
 244             event = self._qmp.pull_event(wait=timeout)
 245             if (event['event'] == name) and event_match(event, match):
 246                 return event
 247             self._events.append(event)
 248
 249         return None
 250
 251 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 252
 253 class QMPTestCase(unittest.TestCase):
 254     '''Abstract base class for QMP test cases'''
 255
 256     def dictpath(self, d, path):
 257         '''Traverse a path in a nested dict'''
 258         for component in path.split('/'):
 259             m = index_re.match(component)
 260             if m:
 261                 component, idx = m.groups()
 262                 idx = int(idx)
 263
 264             if not isinstance(d, dict) or component not in d:
 265                 self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
 266             d = d[component]
 267
 268             if m:
 269                 if not isinstance(d, list):
 270                     self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
 271                 try:
 272                     d = d[idx]
 273                 except IndexError:
 274                     self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
 275         return d
 276
 277     def assert_qmp_absent(self, d, path):
 278         try:
 279             result = self.dictpath(d, path)
 280         except AssertionError:
 281             return
 282         self.fail('path "%s" has value "%s"' % (path, str(result)))
 283
 284     def assert_qmp(self, d, path, value):
 285         '''Assert that the value for a specific path in a QMP dict matches'''
 286         result = self.dictpath(d, path)
 287         self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
 288
 289     def assert_no_active_block_jobs(self):
 290         result = self.vm.qmp('query-block-jobs')
 291         self.assert_qmp(result, 'return', [])
 292
 293     def cancel_and_wait(self, drive='drive0', force=False, resume=False):
 294         '''Cancel a block job and wait for it to finish, returning the event'''
 295         result = self.vm.qmp('block-job-cancel', device=drive, force=force)
 296         self.assert_qmp(result, 'return', {})
 297
 298         if resume:
 299             self.vm.resume_drive(drive)
 300
 301         cancelled = False
 302         result = None
 303         while not cancelled:
 304             for event in self.vm.get_qmp_events(wait=True):
 305                 if event['event'] == 'BLOCK_JOB_COMPLETED' or \
 306                    event['event'] == 'BLOCK_JOB_CANCELLED':
 307                     self.assert_qmp(event, 'data/device', drive)
 308                     result = event
 309                     cancelled = True
 310
 311         self.assert_no_active_block_jobs()
 312         return result
 313
 314     def wait_until_completed(self, drive='drive0', check_offset=True):
 315         '''Wait for a block job to finish, returning the event'''
 316         completed = False
 317         while not completed:
 318             for event in self.vm.get_qmp_events(wait=True):
 319                 if event['event'] == 'BLOCK_JOB_COMPLETED':
 320                     self.assert_qmp(event, 'data/device', drive)
 321                     self.assert_qmp_absent(event, 'data/error')
 322                     if check_offset:
 323                         self.assert_qmp(event, 'data/offset', event['data']['len'])
 324                     completed = True
 325
 326         self.assert_no_active_block_jobs()
 327         return event
 328
 329 def notrun(reason):
 330     '''Skip this test suite'''
 331     # Each test in qemu-iotests has a number ("seq")
 332     seq = os.path.basename(sys.argv[0])
 333
 334     open('%s/%s.notrun' % (output_dir, seq), 'wb').write(reason + '\n')
 335     print '%s not run: %s' % (seq, reason)
 336     sys.exit(0)
 337
 338 def main(supported_fmts=[], supported_oses=['linux']):
 339     '''Run tests'''
 340
 341     debug = '-d' in sys.argv
 342     verbosity = 1
 343     if supported_fmts and (imgfmt not in supported_fmts):
 344         notrun('not suitable for this image format: %s' % imgfmt)
 345
 346     if True not in [sys.platform.startswith(x) for x in supported_oses]:
 347         notrun('not suitable for this OS: %s' % sys.platform)
 348
 349     # We need to filter out the time taken from the output so that qemu-iotest
 350     # can reliably diff the results against master output.
 351     import StringIO
 352     if debug:
 353         output = sys.stdout
 354         verbosity = 2
 355         sys.argv.remove('-d')
 356     else:
 357         output = StringIO.StringIO()
 358
 359     class MyTestRunner(unittest.TextTestRunner):
 360         def __init__(self, stream=output, descriptions=True, verbosity=verbosity):
 361             unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
 362
 363     # unittest.main() will use sys.exit() so expect a SystemExit exception
 364     try:
 365         unittest.main(testRunner=MyTestRunner)
 366     finally:
 367         if not debug:
 368             sys.stderr.write(re.sub(r'Ran (\d+) tests? in [\d.]+s', r'Ran \1 tests', output.getvalue()))