iotest: fix python based IO tests

The previous commit refactoring iotests.py:

  commit 66613974468fb6e1609fb3eabf55981b1ee436cf
  Author: Daniel P. Berrange <berrange@redhat.com>
  Date:   Wed Jul 20 14:23:10 2016 +0100

    scripts: refactor the VM class in iotests for reuse

was not properly tested and included a number of broken
bits.

 - The 'event_match' method was not moved into qemu.py
 - The 'self._args' list parameter in QEMUMachine needs
   to be copied otherwise modifications will affect the
   global 'qemu_opts' variable in iotests.py
 - The QEMUQtestMachine class methods had inverted
   parameter order for the super() calls
 - The QEMUQtestMachine class forgot to add
   '-machine accel=qtest'
 - The QEMUQtestMachine class constructor needs to set
   a default 'name' value before using it as it may
   be None
 - The QEMUQtestMachine class constructor needs to use
   named parameters when calling the super constructor
   as it is leaving out some positional parameters.
 - The 'qemu_prog' variable should be a string not a
   list in iotests.py
 - The VM classs constructor needs to use named
   parameters when calling the super constructor
   as it is leaving out some positional parameters.
 - The path to the socket-scm-helper needs to be
   passed into the QEMUMachine class

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Message-id: 1469549767-27249-1-git-send-email-berrange@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

scripts/qemu.py

@@ -24,7 +24,7 @@ class QEMUMachine(object):
     '''A QEMU VM'''
 
     def __init__(self, binary, args=[], wrapper=[], name=None, test_dir="/var/tmp",
-                 monitor_address=None, debug=False):
+                 monitor_address=None, socket_scm_helper=None, debug=False):
         if name is None:
             name = "qemu-%d" % os.getpid()
         if monitor_address is None:
@@ -33,10 +33,11 @@ def __init__(self, binary, args=[], wrapper=[], name=None, test_dir="/var/tmp",
         self._qemu_log_path = os.path.join(test_dir, name + ".log")
         self._popen = None
         self._binary = binary
-        self._args = args
+        self._args = list(args) # Force copy args in case we modify them
         self._wrapper = wrapper
         self._events = []
         self._iolog = None
+        self._socket_scm_helper = socket_scm_helper
         self._debug = debug
 
     # This can be used to add an unused monitor instance.
@@ -60,11 +61,13 @@ def add_fd(self, fd, fdset, opaque, opts=''):
     def send_fd_scm(self, fd_file_path):
         # In iotest.py, the qmp should always use unix socket.
         assert self._qmp.is_scm_available()
-        bin = socket_scm_helper
-        if os.path.exists(bin) == False:
-            print "Scm help program does not present, path '%s'." % bin
+        if self._socket_scm_helper is None:
+            print >>sys.stderr, "No path to socket_scm_helper set"
             return -1
-        fd_param = ["%s" % bin,
+        if os.path.exists(self._socket_scm_helper) == False:
+            print >>sys.stderr, "%s does not exist" % self._socket_scm_helper
+            return -1
+        fd_param = ["%s" % self._socket_scm_helper,
                     "%d" % self._qmp.get_sock_fd(),
                     "%s" % fd_file_path]
         devnull = open('/dev/null', 'rb')
@@ -183,6 +186,23 @@ def get_qmp_events(self, wait=False):
         return events
 
     def event_wait(self, name, timeout=60.0, match=None):
+        # Test if 'match' is a recursive subset of 'event'
+        def event_match(event, match=None):
+            if match is None:
+                return True
+
+            for key in match:
+                if key in event:
+                    if isinstance(event[key], dict):
+                        if not event_match(event[key], match[key]):
+                            return False
+                    elif event[key] != match[key]:
+                        return False
+                else:
+                    return False
+
+            return True
+
         # Search cached events
         for event in self._events:
             if (event['event'] == name) and event_match(event, match):

scripts/qtest.py

@@ -79,25 +79,30 @@ def settimeout(self, timeout):
 class QEMUQtestMachine(qemu.QEMUMachine):
     '''A QEMU VM'''
 
-    def __init__(self, binary, args=[], name=None, test_dir="/var/tmp"):
-        super(self, QEMUQtestMachine).__init__(binary, args, name, test_dir)
+    def __init__(self, binary, args=[], name=None, test_dir="/var/tmp",
+                 socket_scm_helper=None):
+        if name is None:
+            name = "qemu-%d" % os.getpid()
+        super(QEMUQtestMachine, self).__init__(binary, args, name=name, test_dir=test_dir,
+                                               socket_scm_helper=socket_scm_helper)
         self._qtest_path = os.path.join(test_dir, name + "-qtest.sock")
 
     def _base_args(self):
-        args = super(self, QEMUQtestMachine)._base_args()
-        args.extend(['-qtest', 'unix:path=' + self._qtest_path])
+        args = super(QEMUQtestMachine, self)._base_args()
+        args.extend(['-qtest', 'unix:path=' + self._qtest_path,
+                     '-machine', 'accel=qtest'])
         return args
 
     def _pre_launch(self):
-        super(self, QEMUQtestMachine)._pre_launch()
+        super(QEMUQtestMachine, self)._pre_launch()
         self._qtest = QEMUQtestProtocol(self._qtest_path, server=True)
 
     def _post_launch(self):
-        super(self, QEMUQtestMachine)._post_launch()
+        super(QEMUQtestMachine, self)._post_launch()
         self._qtest.accept()
 
     def _post_shutdown(self):
-        super(self, QEMUQtestMachine)._post_shutdown()
+        super(QEMUQtestMachine, self)._post_shutdown()
         self._remove_if_exists(self._qtest_path)
 
     def qtest(self, cmd):

tests/qemu-iotests/iotests.py

@@ -39,7 +39,7 @@
 if os.environ.get('QEMU_IO_OPTIONS'):
     qemu_io_args += os.environ['QEMU_IO_OPTIONS'].strip().split(' ')
 
-qemu_prog = [os.environ.get('QEMU_PROG', 'qemu')]
+qemu_prog = os.environ.get('QEMU_PROG', 'qemu')
 qemu_opts = os.environ.get('QEMU_OPTIONS', '').strip().split(' ')
 
 imgfmt = os.environ.get('IMGFMT', 'raw')
@@ -128,28 +128,12 @@ def log(msg, filters=[]):
         msg = flt(msg)
     print msg
 
-# Test if 'match' is a recursive subset of 'event'
-def event_match(event, match=None):
-    if match is None:
-        return True
-
-    for key in match:
-        if key in event:
-            if isinstance(event[key], dict):
-                if not event_match(event[key], match[key]):
-                    return False
-            elif event[key] != match[key]:
-                return False
-        else:
-            return False
-
-    return True
-
-class VM(qtest.QEMUMachine):
+class VM(qtest.QEMUQtestMachine):
     '''A QEMU VM'''
 
     def __init__(self):
-        super(self, VM).__init__(qemu_prog, qemu_opts, test_dir)
+        super(VM, self).__init__(qemu_prog, qemu_opts, test_dir=test_dir,
+                                 socket_scm_helper=socket_scm_helper)
         self._num_drives = 0
 
     def add_drive_raw(self, opts):