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 unittest
  23 import sys; sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'QMP'))
  24 import qmp
  25
  26 __all__ = ['imgfmt', 'imgproto', 'test_dir' 'qemu_img', 'qemu_io',
  27            'VM', 'QMPTestCase', 'notrun', 'main']
  28
  29 # This will not work if arguments or path contain spaces but is necessary if we
  30 # want to support the override options that ./check supports.
  31 qemu_img_args = os.environ.get('QEMU_IMG', 'qemu-img').split(' ')
  32 qemu_io_args = os.environ.get('QEMU_IO', 'qemu-io').split(' ')
  33 qemu_args = os.environ.get('QEMU', 'qemu').split(' ')
  34
  35 imgfmt = os.environ.get('IMGFMT', 'raw')
  36 imgproto = os.environ.get('IMGPROTO', 'file')
  37 test_dir = os.environ.get('TEST_DIR', '/var/tmp')
  38
  39 def qemu_img(*args):
  40     '''Run qemu-img and return the exit code'''
  41     devnull = open('/dev/null', 'r+')
  42     return subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
  43
  44 def qemu_io(*args):
  45     '''Run qemu-io and return the stdout data'''
  46     args = qemu_io_args + list(args)
  47     return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0]
  48
  49 class VM(object):
  50     '''A QEMU VM'''
  51
  52     def __init__(self):
  53         self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
  54         self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
  55         self._args = qemu_args + ['-chardev',
  56                      'socket,id=mon,path=' + self._monitor_path,
  57                      '-mon', 'chardev=mon,mode=control', '-nographic']
  58         self._num_drives = 0
  59
  60     def add_drive(self, path, opts=''):
  61         '''Add a virtio-blk drive to the VM'''
  62         options = ['if=virtio',
  63                    'format=%s' % imgfmt,
  64                    'cache=none',
  65                    'file=%s' % path,
  66                    'id=drive%d' % self._num_drives]
  67         if opts:
  68             options.append(opts)
  69
  70         self._args.append('-drive')
  71         self._args.append(','.join(options))
  72         self._num_drives += 1
  73         return self
  74
  75     def launch(self):
  76         '''Launch the VM and establish a QMP connection'''
  77         devnull = open('/dev/null', 'rb')
  78         qemulog = open(self._qemu_log_path, 'wb')
  79         try:
  80             self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
  81             self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
  82                                            stderr=subprocess.STDOUT)
  83             self._qmp.accept()
  84         except:
  85             os.remove(self._monitor_path)
  86             raise
  87
  88     def shutdown(self):
  89         '''Terminate the VM and clean up'''
  90         self._qmp.cmd('quit')
  91         self._popen.wait()
  92         os.remove(self._monitor_path)
  93         os.remove(self._qemu_log_path)
  94
  95     def qmp(self, cmd, **args):
  96         '''Invoke a QMP command and return the result dict'''
  97         return self._qmp.cmd(cmd, args=args)
  98
  99     def get_qmp_events(self, wait=False):
 100         '''Poll for queued QMP events and return a list of dicts'''
 101         events = self._qmp.get_events(wait=wait)
 102         self._qmp.clear_events()
 103         return events
 104
 105 index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
 106
 107 class QMPTestCase(unittest.TestCase):
 108     '''Abstract base class for QMP test cases'''
 109
 110     def dictpath(self, d, path):
 111         '''Traverse a path in a nested dict'''
 112         for component in path.split('/'):
 113             m = index_re.match(component)
 114             if m:
 115                 component, idx = m.groups()
 116                 idx = int(idx)
 117
 118             if not isinstance(d, dict) or component not in d:
 119                 self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
 120             d = d[component]
 121
 122             if m:
 123                 if not isinstance(d, list):
 124                     self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
 125                 try:
 126                     d = d[idx]
 127                 except IndexError:
 128                     self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
 129         return d
 130
 131     def assert_qmp(self, d, path, value):
 132         '''Assert that the value for a specific path in a QMP dict matches'''
 133         result = self.dictpath(d, path)
 134         self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
 135
 136 def notrun(reason):
 137     '''Skip this test suite'''
 138     # Each test in qemu-iotests has a number ("seq")
 139     seq = os.path.basename(sys.argv[0])
 140
 141     open('%s.notrun' % seq, 'wb').write(reason + '\n')
 142     print '%s not run: %s' % (seq, reason)
 143     sys.exit(0)
 144
 145 def main(supported_fmts=[]):
 146     '''Run tests'''
 147
 148     if supported_fmts and (imgfmt not in supported_fmts):
 149         notrun('not suitable for this image format: %s' % imgfmt)
 150
 151     # We need to filter out the time taken from the output so that qemu-iotest
 152     # can reliably diff the results against master output.
 153     import StringIO
 154     output = StringIO.StringIO()
 155
 156     class MyTestRunner(unittest.TextTestRunner):
 157         def __init__(self, stream=output, descriptions=True, verbosity=1):
 158             unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
 159
 160     # unittest.main() will use sys.exit() so expect a SystemExit exception
 161     try:
 162         unittest.main(testRunner=MyTestRunner)
 163     finally:
 164         sys.stderr.write(re.sub(r'Ran (\d+) test[s] in [\d.]+s', r'Ran \1 tests', output.getvalue()))