Re: [PATCH 1/6] Python: close the log file kept by QEMUMachine before reading it

[Cleber Rosa <crosa@redhat.com>]

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On Mon, Feb 15, 2021 at 03:30:16PM -0300, Wainer dos Santos Moschetta wrote:
> Hi,
> 
> On 2/11/21 7:01 PM, Cleber Rosa wrote:
> > Closing a file that is open for writing, and then reading from it
> > sounds like a better idea than the opposite, given that the content
> > will be flushed.
> > 
> > Reference: https://docs.python.org/3/library/io.html#io.IOBase.close
> > Signed-off-by: Cleber Rosa <crosa@redhat.com>
> > ---
> >   python/qemu/machine.py | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/python/qemu/machine.py b/python/qemu/machine.py
> > index 7a40f4604b..6e44bda337 100644
> > --- a/python/qemu/machine.py
> > +++ b/python/qemu/machine.py
> > @@ -337,12 +337,12 @@ class QEMUMachine:
> >               self._qmp.close()
> >               self._qmp_connection = None
> > -        self._load_io_log()
> > -
> >           if self._qemu_log_file is not None:
> >               self._qemu_log_file.close()
> >               self._qemu_log_file = None
> > +        self._load_io_log()
> > +
> 
> 
> IMO it's a too fragile fix. It needs the `self._qemu_log_file.close()` being
> called before `self._load_io_log()` but a future change can make this
> condition unmet again. Maybe you could document that in the code. Or change
> the `_load_io_log()` to close the log file if it is open (also document it
> in code).
> 
> - Wainer
>

I'm glad you see this is needed... and then something else.  I'll investigate
making this more robust as time allows it.

Question is: do you ack/nack this change?

Cheers,
- Cleber.

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