[PATCH v2 5/6] python/machine: Disable pylint warning for open() in _pre_launch

[John Snow]

Shift the open() call later so that the pylint pragma applies *only* to
that one open() call. Add a note that suggests why this is safe: the
resource is unconditionally cleaned up in _post_shutdown().

_post_shutdown is called after failed launches (see launch()), and
unconditionally after every call to shutdown(), and therefore also on
__exit__.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>
---
 python/qemu/machine.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/python/qemu/machine.py b/python/qemu/machine.py
index 2e55e2c8bd8..f021127f0fc 100644
--- a/python/qemu/machine.py
+++ b/python/qemu/machine.py
@@ -308,7 +308,6 @@ def _pre_launch(self) -> None:
         self._temp_dir = tempfile.mkdtemp(prefix="qemu-machine-",
                                           dir=self._test_dir)
         self._qemu_log_path = os.path.join(self._temp_dir, self._name + ".log")
-        self._qemu_log_file = open(self._qemu_log_path, 'wb')
 
         if self._console_set:
             self._remove_files.append(self._console_address)
@@ -323,6 +322,11 @@ def _pre_launch(self) -> None:
                 nickname=self._name
             )
 
+        # NOTE: Make sure any opened resources are *definitely* freed in
+        # _post_shutdown()!
+        # pylint: disable=consider-using-with
+        self._qemu_log_file = open(self._qemu_log_path, 'wb')
+
     def _post_launch(self) -> None:
         if self._qmp_connection:
             self._qmp.accept()
-- 
2.30.2