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python/qemu/qtest: Check before accessing _qtest

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It can be None; so add assertions or exceptions where appropriate to
guard the access accordingly.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200514055403.18902-30-jsnow@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
This commit is contained in:
John Snow 2020-05-14 01:54:00 -04:00 committed by Philippe Mathieu-Daudé
parent de210ec53c
commit c95dddce49
1 changed files with 11 additions and 3 deletions
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14
python/qemu/qtest.py
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@ -121,7 +121,8 @@ def _pre_launch(self):
super()._pre_launch()
self._qtest = QEMUQtestProtocol(self._qtest_path, server=True)
def _post_launch(self):
def _post_launch(self) -> None:
assert self._qtest is not None
super()._post_launch()
self._qtest.accept()
@ -129,6 +130,13 @@ def _post_shutdown(self):
super()._post_shutdown()
self._remove_if_exists(self._qtest_path)
def qtest(self, cmd):
'''Send a qtest command to guest'''
def qtest(self, cmd: str) -> str:
"""
Send a qtest command to the guest.
:param cmd: qtest command to send
:return: qtest server response
"""
if self._qtest is None:
raise RuntimeError("qtest socket not available")
return self._qtest.cmd(cmd)