Re: [PATCH] qtest/migration: Add a test for the analyze-migration script

[Fabiano Rosas <farosas@suse.de>]

Thomas Huth <thuth@redhat.com> writes:

> On 28/09/2023 15.32, Fabiano Rosas wrote:
>> Thomas Huth <thuth@redhat.com> writes:
>> 
>>> On 27/09/2023 23.47, Fabiano Rosas wrote:
>>>> Add a smoke test that migrates to a file and gives it to the
>>>> script. It should catch the most annoying errors such as changes in
>>>> the ram flags.
>>>>
>>>> After code has been merged it becomes way harder to figure out what is
>>>> causing the script to fail, the person making the change is the most
>>>> likely to know right away what the problem is.
>>>>
>>>> Signed-off-by: Fabiano Rosas <farosas@suse.de>
>>>> ---
>>>> I know this adds a python dependency to qtests and I'm not sure how
>>>> much we care about this script, but on the other hand it would be nice
>>>> to catch these errors early on.
>>>>
>>>> This would also help with future work that touches the migration
>>>> stream (moving multifd out of ram.c and fixed-ram).
>>>>
>>>> Let me know what you think.
>>>
>>> Without looking at this too closely, my first thought was: This sounds
>>> rather like a good candidate for an avocado test instead. It's using Python,
>>> so tests/avocado/ sounds like a better fit. Have you considered adding it as
>>> an avocado test already?
>>>
>> 
>> I intended to keep all migration tests at the same place. And well, to
>> be honest, I have given up on avocado. Too unmaintained, incrutable
>> logging and last time I tried to use it locally, it was leaving stale
>> processes behind upon failure.
>> 
>> Of course, if that's the preferred place to put python tests I could do
>> it, but I don't find it too compelling.
>
> Well, I guess this test here is kind of borderline, since it does not 
> introduce new Python code, but just calls a pre-existing python script...
> maybe that's still ok for the qtests ... what do other people think?
>
>>>   >+#define ANALYZE_SCRIPT "tests/qtest/analyze-migration.py"
>>>
>>> Why can't you use scripts/analyze-migration.py directly?
>>>
>> 
>> I'm not entirely sure that's the case with QEMU, but generally build
>> directories can move/not be directly under the source tree. The test
>> wouldn't know from where to fetch the script.
>
> AFAIK the build system puts a symlink for the scripts folder into the build 
> directory, at least I have one in mine.
>

Oh, I have one too. It never crossed my mind that it could already be
there! I should be able to use it then.

Thanks!