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_io(*args):
  46     '''Run qemu-io and return the stdout data'''
  47     args = qemu_io_args + list(args)
  48     return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0]
  49
  50 class VM(object):
  51     '''A QEMU VM'''
  52
  53     def __init__(self):
  54         self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
  55         self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
  56         self._args = qemu_args + ['-chardev',
  57                      'socket,id=mon,path=' + self._monitor_path,
  58                      '-mon', 'chardev=mon,mode=control',
  59                      '-qtest', 'stdio', '-machine', 'accel=qtest',
  60                      '-display', 'none', '-vga', 'none']
  61         self._num_drives = 0
  62
  63     def add_drive(self, path, opts=''):
  64         '''Add a virtio-blk drive to the VM'''
  65         options = ['if=virtio',
  66                    'format=%s' % imgfmt,
  67                    'cache=none',
  68                    'file=%s' % path,
  69                    'id=drive%d' % self._num_drives]
  70         if opts:
  71             options.append(opts)
  72
  73         self._args.append('-drive')
  74         self._args.append(','.join(options))
  75         self._num_drives += 1
  76         return self
  77
  78     def launch(self):
  79         '''Launch the VM and establish a QMP connection'''
  80         devnull = open('/dev/null', 'rb')
  81         qemulog = open(self._qemu_log_path, 'wb')
  82         try:
  83             self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
  84             self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
  85                                            stderr=subprocess.STDOUT)
  86             self._qmp.accept()
  87         except:
  88             os.remove(self._monitor_path)
  89             raise
  90
  91     def shutdown(self):
  92         '''Terminate the VM and clean up'''
  93         if not self._popen is None:
  94             self._qmp.cmd('quit')
  95             self._popen.wait()
  96             os.remove(self._monitor_path)
  97             os.remove(self._qemu_log_path)
  98             self._popen = None
  99
 100     underscore_to_dash = string.maketrans('_', '-')
 101     def qmp(self, cmd, **args):
 102         '''Invoke a QMP command and return the result dict'''
 103         qmp_args = dict()
 104         for k in args.keys():
 105             qmp_args[k.translate(self.underscore_to_dash)] = args[k]
 106
 107         return self._qmp.cmd(cmd, args=qmp_args)
 108
 109     def get_qmp_events(self, wait=False):
 110         '''Poll for queued QMP events and return a list of dicts'''
 111         events = self._qmp.get_events(wait=wait)
 112         self._qmp.clear_events()
 113         return events
 114
 115 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 116
 117 class QMPTestCase(unittest.TestCase):
 118     '''Abstract base class for QMP test cases'''
 119
 120     def dictpath(self, d, path):
 121         '''Traverse a path in a nested dict'''
 122         for component in path.split('/'):
 123             m = index_re.match(component)
 124             if m:
 125                 component, idx = m.groups()
 126                 idx = int(idx)
 127
 128             if not isinstance(d, dict) or component not in d:
 129                 self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
 130             d = d[component]
 131
 132             if m:
 133                 if not isinstance(d, list):
 134                     self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
 135                 try:
 136                     d = d[idx]
 137                 except IndexError:
 138                     self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
 139         return d
 140
 141     def assert_qmp_absent(self, d, path):
 142         try:
 143             result = self.dictpath(d, path)
 144         except AssertionError:
 145             return
 146         self.fail('path "%s" has value "%s"' % (path, str(result)))
 147
 148     def assert_qmp(self, d, path, value):
 149         '''Assert that the value for a specific path in a QMP dict matches'''
 150         result = self.dictpath(d, path)
 151         self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
 152
 153 def notrun(reason):
 154     '''Skip this test suite'''
 155     # Each test in qemu-iotests has a number ("seq")
 156     seq = os.path.basename(sys.argv[0])
 157
 158     open('%s.notrun' % seq, 'wb').write(reason + '\n')
 159     print '%s not run: %s' % (seq, reason)
 160     sys.exit(0)
 161
 162 def main(supported_fmts=[]):
 163     '''Run tests'''
 164
 165     if supported_fmts and (imgfmt not in supported_fmts):
 166         notrun('not suitable for this image format: %s' % imgfmt)
 167
 168     # We need to filter out the time taken from the output so that qemu-iotest
 169     # can reliably diff the results against master output.
 170     import StringIO
 171     output = StringIO.StringIO()
 172
 173     class MyTestRunner(unittest.TextTestRunner):
 174         def __init__(self, stream=output, descriptions=True, verbosity=1):
 175             unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
 176
 177     # unittest.main() will use sys.exit() so expect a SystemExit exception
 178     try:
 179         unittest.main(testRunner=MyTestRunner)
 180     finally:
 181         sys.stderr.write(re.sub(r'Ran (\d+) test[s] in [\d.]+s', r'Ran \1 tests', output.getvalue()))