qemu-iotests: add iotests Python module
Block layer tests that involve QMP commands rather than qemu-img or qemu-io are not well-suited for shell scripting. This patch adds a Python module which allows tests to be written in Python instead. The basic API is: VM - class for launching and interacting with a VM QMPTestCase - abstract base class for tests that use QMP qemu_img() - wrapper function for invoking qemu-img qemu_io() - wrapper function for invoking qemu-io imgfmt - the image format under test (e.g. qcow2, qed) test_dir - scratch directory path for temporary files main() - entry point for running tests Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Stefan Hajnoczi
Kevin Wolf
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049255b60c
commit
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164
tests/qemu-iotests/iotests.py
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164
tests/qemu-iotests/iotests.py
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# Common utilities and Python wrappers for qemu-iotests
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#
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# Copyright (C) 2012 IBM Corp.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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import os
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import re
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import subprocess
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import unittest
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import sys; sys.path.append(os.path.join(os.path.dirname(__file__), '..', '..', 'QMP'))
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import qmp
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__all__ = ['imgfmt', 'imgproto', 'test_dir' 'qemu_img', 'qemu_io',
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'VM', 'QMPTestCase', 'notrun', 'main']
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# This will not work if arguments or path contain spaces but is necessary if we
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# want to support the override options that ./check supports.
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qemu_img_args = os.environ.get('QEMU_IMG', 'qemu-img').split(' ')
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qemu_io_args = os.environ.get('QEMU_IO', 'qemu-io').split(' ')
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qemu_args = os.environ.get('QEMU', 'qemu').split(' ')
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imgfmt = os.environ.get('IMGFMT', 'raw')
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imgproto = os.environ.get('IMGPROTO', 'file')
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test_dir = os.environ.get('TEST_DIR', '/var/tmp')
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def qemu_img(*args):
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'''Run qemu-img and return the exit code'''
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devnull = open('/dev/null', 'r+')
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return subprocess.call(qemu_img_args + list(args), stdin=devnull, stdout=devnull)
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def qemu_io(*args):
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'''Run qemu-io and return the stdout data'''
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args = qemu_io_args + list(args)
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return subprocess.Popen(args, stdout=subprocess.PIPE).communicate()[0]
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class VM(object):
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'''A QEMU VM'''
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def __init__(self):
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self._monitor_path = os.path.join(test_dir, 'qemu-mon.%d' % os.getpid())
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self._qemu_log_path = os.path.join(test_dir, 'qemu-log.%d' % os.getpid())
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self._args = qemu_args + ['-chardev',
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'socket,id=mon,path=' + self._monitor_path,
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'-mon', 'chardev=mon,mode=control', '-nographic']
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self._num_drives = 0
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def add_drive(self, path, opts=''):
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'''Add a virtio-blk drive to the VM'''
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options = ['if=virtio',
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'format=%s' % imgfmt,
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'cache=none',
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'file=%s' % path,
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'id=drive%d' % self._num_drives]
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if opts:
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options.append(opts)
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self._args.append('-drive')
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self._args.append(','.join(options))
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self._num_drives += 1
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return self
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def launch(self):
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'''Launch the VM and establish a QMP connection'''
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devnull = open('/dev/null', 'rb')
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qemulog = open(self._qemu_log_path, 'wb')
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try:
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self._qmp = qmp.QEMUMonitorProtocol(self._monitor_path, server=True)
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self._popen = subprocess.Popen(self._args, stdin=devnull, stdout=qemulog,
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stderr=subprocess.STDOUT)
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self._qmp.accept()
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except:
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os.remove(self._monitor_path)
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raise
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def shutdown(self):
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'''Terminate the VM and clean up'''
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self._qmp.cmd('quit')
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self._popen.wait()
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os.remove(self._monitor_path)
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os.remove(self._qemu_log_path)
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def qmp(self, cmd, **args):
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'''Invoke a QMP command and return the result dict'''
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return self._qmp.cmd(cmd, args=args)
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def get_qmp_events(self, wait=False):
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'''Poll for queued QMP events and return a list of dicts'''
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events = self._qmp.get_events(wait=wait)
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self._qmp.clear_events()
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return events
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index_re = re.compile(r'([^\[]+)\[([^\]]+)\]')
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class QMPTestCase(unittest.TestCase):
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'''Abstract base class for QMP test cases'''
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def dictpath(self, d, path):
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'''Traverse a path in a nested dict'''
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for component in path.split('/'):
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m = index_re.match(component)
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if m:
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component, idx = m.groups()
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idx = int(idx)
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if not isinstance(d, dict) or component not in d:
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self.fail('failed path traversal for "%s" in "%s"' % (path, str(d)))
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d = d[component]
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if m:
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if not isinstance(d, list):
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self.fail('path component "%s" in "%s" is not a list in "%s"' % (component, path, str(d)))
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try:
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d = d[idx]
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except IndexError:
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self.fail('invalid index "%s" in path "%s" in "%s"' % (idx, path, str(d)))
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return d
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def assert_qmp(self, d, path, value):
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'''Assert that the value for a specific path in a QMP dict matches'''
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result = self.dictpath(d, path)
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self.assertEqual(result, value, 'values not equal "%s" and "%s"' % (str(result), str(value)))
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def notrun(reason):
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'''Skip this test suite'''
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# Each test in qemu-iotests has a number ("seq")
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seq = os.path.basename(sys.argv[0])
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open('%s.notrun' % seq, 'wb').write(reason + '\n')
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print '%s not run: %s' % (seq, reason)
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sys.exit(0)
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def main(supported_fmts=[]):
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'''Run tests'''
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if supported_fmts and (imgfmt not in supported_fmts):
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notrun('not suitable for this image format: %s' % imgfmt)
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# We need to filter out the time taken from the output so that qemu-iotest
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# can reliably diff the results against master output.
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import StringIO
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output = StringIO.StringIO()
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class MyTestRunner(unittest.TextTestRunner):
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def __init__(self, stream=output, descriptions=True, verbosity=1):
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unittest.TextTestRunner.__init__(self, stream, descriptions, verbosity)
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# unittest.main() will use sys.exit() so expect a SystemExit exception
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try:
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unittest.main(testRunner=MyTestRunner)
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finally:
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sys.stderr.write(re.sub(r'Ran (\d+) test[s] in [\d.]+s', r'Ran \1 tests', output.getvalue()))
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