Re: [Qemu-devel] [Qemu-block] [PATCH v5 4/6] iotests: Valgrind fails with nonexistent directory

[Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>]

On 27/08/2019 22:45, John Snow wrote:
> 
> 
> On 8/25/19 11:24 AM, Andrey Shinkevich wrote:
>>
>>
>> On 16/08/2019 03:55, John Snow wrote:
>>>
>>>
>>> On 7/19/19 12:30 PM, Andrey Shinkevich wrote:
>>>> The Valgrind uses the exported variable TMPDIR and fails if the
>>>> directory does not exist. Let us exclude such a test case from
>>>> being run under the Valgrind and notify the user of it.
>>>>
>>>> Suggested-by: Kevin Wolf <kwolf@redhat.com>
>>>> Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
>>>> ---
>>>>    tests/qemu-iotests/051 | 4 ++++
>>>>    1 file changed, 4 insertions(+)
>>>>
>>>> diff --git a/tests/qemu-iotests/051 b/tests/qemu-iotests/051
>>>> index ce942a5..f8141ca 100755
>>>> --- a/tests/qemu-iotests/051
>>>> +++ b/tests/qemu-iotests/051
>>>> @@ -377,6 +377,10 @@ printf %b "qemu-io $device_id \"write -P 0x33 0 4k\"\ncommit $device_id\n" |
>>>>    $QEMU_IO -c "read -P 0x33 0 4k" "$TEST_IMG" | _filter_qemu_io
>>>>    
>>>>    # Using snapshot=on with a non-existent TMPDIR
>>>> +if [ "${VALGRIND_QEMU}" == "y" ]; then
>>>> +    _casenotrun "Valgrind needs a valid TMPDIR for itself"
>>>> +fi
>>>> +VALGRIND_QEMU="" \
>>>>    TMPDIR=/nonexistent run_qemu -drive driver=null-co,snapshot=on
>>>>    
>>>>    # Using snapshot=on together with read-only=on
>>>>
>>>
>>> The only other way around this would be a complicated mechanism to set
>>> the TMPDIR for valgrind's sub-processes only, with e.g.
>>>
>>> valgrind ... env TMPDIR=/nonexistent qemu ...
>>>
>>> ... It's probably not worth trying to concoct such a thing; but I
>>> suppose it is possible. You'd have to set up a generic layer for setting
>>> environment variables, then in the qemu shim, you could either set them
>>> directly (non-valgrind invocation) or set them as part of the valgrind
>>> command-line.
>>>
>>> Or you could just take my R-B:
>>>
>>> Reviewed-by: John Snow <jsnow@redhat.com>
>>>
>>
>> Thanks again John for your review and the advice.
>> Probably, it doesn't worth efforts to manage that case because QEMU
>> should fail anyway with the error message "Could not get temporary
>> filename: No such file or directory". So, we would not benefit much from
>> that run. We have other test cases that cover the main functionality.
>> It's just to check the QEMU error path for possible memory issues. Shall we?
>>
>> Andrey
>>
> 
> Yeah, don't bother with this for now. I just have a personal compulsion
> to try to concretely measure how much work it would take to avoid a
> "hack" and then make my decision.
> 
> You're free to just take the R-B :)
> 
> --js
> 

Thank you, John. Done in v6.
Please check the series in the email message
"[PATCH v6 0/6] Allow Valgrind checking all QEMU processes"
by 26.08.2019 with the message ID
<1566834628-485525-1-git-send-email-andrey.shinkevich@virtuozzo.com>

Andrey
-- 
With the best regards,
Andrey Shinkevich