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[PATCH v5 13/16] python/machine.py: fix _popen access
From: |
John Snow |
Subject: |
[PATCH v5 13/16] python/machine.py: fix _popen access |
Date: |
Fri, 10 Jul 2020 01:22:17 -0400 |
As always, Optional[T] causes problems with unchecked access. Add a
helper that asserts the pipe is present before we attempt to talk with
it.
Signed-off-by: John Snow <jsnow@redhat.com>
---
python/qemu/machine.py | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 9760a2badb..2ba5e3134e 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -120,7 +120,7 @@ def __init__(self, binary, args=None, wrapper=None,
name=None,
# Runstate
self._qemu_log_path = None
self._qemu_log_file = None
- self._popen = None
+ self._popen: Optional['subprocess.Popen[bytes]'] = None
self._events = []
self._iolog = None
self._qmp_set = True # Enable QMP monitor by default.
@@ -233,6 +233,12 @@ def is_running(self):
"""Returns true if the VM is running."""
return self._popen is not None and self._popen.poll() is None
+ @property
+ def _subp(self) -> 'subprocess.Popen[bytes]':
+ if self._popen is None:
+ raise QEMUMachineError('Subprocess pipe not present')
+ return self._popen
+
def exitcode(self):
"""Returns the exit code if possible, or None."""
if self._popen is None:
@@ -243,7 +249,7 @@ def get_pid(self):
"""Returns the PID of the running process, or None."""
if not self.is_running():
return None
- return self._popen.pid
+ return self._subp.pid
def _load_io_log(self):
if self._qemu_log_path is not None:
@@ -404,8 +410,8 @@ def _hard_shutdown(self) -> None:
waiting for the QEMU process to terminate.
"""
self._early_cleanup()
- self._popen.kill()
- self._popen.wait(timeout=60)
+ self._subp.kill()
+ self._subp.wait(timeout=60)
def _soft_shutdown(self, has_quit: bool = False,
timeout: Optional[int] = 3) -> None:
@@ -429,7 +435,7 @@ def _soft_shutdown(self, has_quit: bool = False,
self._qmp.cmd('quit')
# May raise subprocess.TimeoutExpired
- self._popen.wait(timeout=timeout)
+ self._subp.wait(timeout=timeout)
def _do_shutdown(self, has_quit: bool = False,
timeout: Optional[int] = 3) -> None:
--
2.21.3
- [PATCH v5 03/16] python/qmp.py: re-absorb MonitorResponseError, (continued)
- [PATCH v5 03/16] python/qmp.py: re-absorb MonitorResponseError, John Snow, 2020/07/10
- [PATCH v5 04/16] python/qmp.py: Do not return None from cmd_obj, John Snow, 2020/07/10
- [PATCH v5 05/16] python/qmp.py: add casts to JSON deserialization, John Snow, 2020/07/10
- [PATCH v5 06/16] python/qmp.py: add QMPProtocolError, John Snow, 2020/07/10
- [PATCH v5 09/16] python/machine.py: Don't modify state in _base_args(), John Snow, 2020/07/10
- [PATCH v5 07/16] python/machine.py: Fix monitor address typing, John Snow, 2020/07/10
- [PATCH v5 08/16] python/machine.py: reorder __init__, John Snow, 2020/07/10
- [PATCH v5 10/16] python/machine.py: Handle None events in events_wait, John Snow, 2020/07/10
- [PATCH v5 12/16] python/machine.py: Add _qmp access shim, John Snow, 2020/07/10
- [PATCH v5 13/16] python/machine.py: fix _popen access,
John Snow <=
- [PATCH v5 11/16] python/machine.py: use qmp.command, John Snow, 2020/07/10
- [PATCH v5 15/16] iotests.py: Adjust HMP kwargs typing, John Snow, 2020/07/10
- [PATCH v5 14/16] python/qemu: make 'args' style arguments immutable, John Snow, 2020/07/10
- [PATCH v5 16/16] python/qemu: Add mypy type annotations, John Snow, 2020/07/10
- Re: [PATCH v5 00/16] python: add mypy support to python/qemu, Philippe Mathieu-Daudé, 2020/07/14