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; sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'QMP'))
  25 import qmp
  26
  27 __all__ = ['imgfmt', 'imgproto', 'test_dir' 'qemu_img', 'qemu_io',
  28            'VM', 'QMPTestCase', 'notrun', 'main']
  29
  30 # This will not work if arguments or path contain spaces but is necessary if we
  31 # want to support the override options that ./check supports.
  32 qemu_img_args = os.environ.get('QEMU_IMG', 'qemu-img').strip().split(' ')
  33 qemu_io_args = os.environ.get('QEMU_IO', 'qemu-io').strip().split(' ')
  34 qemu_args = os.environ.get('QEMU', 'qemu').strip().split(' ')
  35
  36 imgfmt = os.environ.get('IMGFMT', 'raw')
  37 imgproto = os.environ.get('IMGPROTO', 'file')
  38 test_dir = os.environ.get('TEST_DIR', '/var/tmp')
  39
  40 def qemu_img(*args):
  41     '''Run qemu-img and return the exit code'''
  42     devnull = open('/dev/null', 'r+')
  43     return subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
  44
  45 def qemu_img_verbose(*args):
  46     '''Run qemu-img without suppressing its output and return the exit code'''
  47     return subprocess.call(qemu_img_args + list(args))
  48
  49 def qemu_io(*args):
  50     '''Run qemu-io and return the stdout data'''
  51     args = qemu_io_args + list(args)
  52     return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0]
  53
  54 class VM(object):
  55     '''A QEMU VM'''
  56
  57     def __init__(self):
  58         self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
  59         self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
  60         self._args = qemu_args + ['-chardev',
  61                      'socket,id=mon,path=' + self._monitor_path,
  62                      '-mon', 'chardev=mon,mode=control',
  63                      '-qtest', 'stdio', '-machine', 'accel=qtest',
  64                      '-display', 'none', '-vga', 'none']
  65         self._num_drives = 0
  66
  67     def add_drive(self, path, opts=''):
  68         '''Add a virtio-blk drive to the VM'''
  69         options = ['if=virtio',
  70                    'format=%s' % imgfmt,
  71                    'cache=none',
  72                    'file=%s' % path,
  73                    'id=drive%d' % self._num_drives]
  74         if opts:
  75             options.append(opts)
  76
  77         self._args.append('-drive')
  78         self._args.append(','.join(options))
  79         self._num_drives += 1
  80         return self
  81
  82     def add_fd(self, fd, fdset, opaque, opts=''):
  83         '''Pass a file descriptor to the VM'''
  84         options = ['fd=%d' % fd,
  85                    'set=%d' % fdset,
  86                    'opaque=%s' % opaque]
  87         if opts:
  88             options.append(opts)
  89
  90         self._args.append('-add-fd')
  91         self._args.append(','.join(options))
  92         return self
  93
  94     def launch(self):
  95         '''Launch the VM and establish a QMP connection'''
  96         devnull = open('/dev/null', 'rb')
  97         qemulog = open(self._qemu_log_path, 'wb')
  98         try:
  99             self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
 100             self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
 101                                            stderr=subprocess.STDOUT)
 102             self._qmp.accept()
 103         except:
 104             os.remove(self._monitor_path)
 105             raise
 106
 107     def shutdown(self):
 108         '''Terminate the VM and clean up'''
 109         if not self._popen is None:
 110             self._qmp.cmd('quit')
 111             self._popen.wait()
 112             os.remove(self._monitor_path)
 113             os.remove(self._qemu_log_path)
 114             self._popen = None
 115
 116     underscore_to_dash = string.maketrans('_', '-')
 117     def qmp(self, cmd, **args):
 118         '''Invoke a QMP command and return the result dict'''
 119         qmp_args = dict()
 120         for k in args.keys():
 121             qmp_args[k.translate(self.underscore_to_dash)] = args[k]
 122
 123         return self._qmp.cmd(cmd, args=qmp_args)
 124
 125     def get_qmp_event(self, wait=False):
 126         '''Poll for one queued QMP events and return it'''
 127         return self._qmp.pull_event(wait=wait)
 128
 129     def get_qmp_events(self, wait=False):
 130         '''Poll for queued QMP events and return a list of dicts'''
 131         events = self._qmp.get_events(wait=wait)
 132         self._qmp.clear_events()
 133         return events
 134
 135 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 136
 137 class QMPTestCase(unittest.TestCase):
 138     '''Abstract base class for QMP test cases'''
 139
 140     def dictpath(self, d, path):
 141         '''Traverse a path in a nested dict'''
 142         for component in path.split('/'):
 143             m = index_re.match(component)
 144             if m:
 145                 component, idx = m.groups()
 146                 idx = int(idx)
 147
 148             if not isinstance(d, dict) or component not in d:
 149                 self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
 150             d = d[component]
 151
 152             if m:
 153                 if not isinstance(d, list):
 154                     self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
 155                 try:
 156                     d = d[idx]
 157                 except IndexError:
 158                     self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
 159         return d
 160
 161     def assert_qmp_absent(self, d, path):
 162         try:
 163             result = self.dictpath(d, path)
 164         except AssertionError:
 165             return
 166         self.fail('path "%s" has value "%s"' % (path, str(result)))
 167
 168     def assert_qmp(self, d, path, value):
 169         '''Assert that the value for a specific path in a QMP dict matches'''
 170         result = self.dictpath(d, path)
 171         self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
 172
 173 def notrun(reason):
 174     '''Skip this test suite'''
 175     # Each test in qemu-iotests has a number ("seq")
 176     seq = os.path.basename(sys.argv[0])
 177
 178     open('%s.notrun' % seq, 'wb').write(reason + '\n')
 179     print '%s not run: %s' % (seq, reason)
 180     sys.exit(0)
 181
 182 def main(supported_fmts=[]):
 183     '''Run tests'''
 184
 185     if supported_fmts and (imgfmt not in supported_fmts):
 186         notrun('not suitable for this image format: %s' % imgfmt)
 187
 188     # We need to filter out the time taken from the output so that qemu-iotest
 189     # can reliably diff the results against master output.
 190     import StringIO
 191     output = StringIO.StringIO()
 192
 193     class MyTestRunner(unittest.TextTestRunner):
 194         def __init__(self, stream=output, descriptions=True, verbosity=1):
 195             unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
 196
 197     # unittest.main() will use sys.exit() so expect a SystemExit exception
 198     try:
 199         unittest.main(testRunner=MyTestRunner)
 200     finally:
 201         sys.stderr.write(re.sub(r'Ran (\d+) tests? in [\d.]+s', r'Ran \1 tests', output.getvalue()))