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Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] iotests.py: Add qemu_nbd_pipe(

From: Eric Blake
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH 1/3] iotests.py: Add qemu_nbd_pipe()
Date: Wed, 23 Jan 2019 08:27:04 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0

On 1/23/19 7:06 AM, Max Reitz wrote:
> On 21.01.19 21:55, Eric Blake wrote:
>> On 12/21/18 5:47 PM, Max Reitz wrote:
>>> In some cases, we may want to deal with qemu-nbd errors (e.g. by
>>> launching it in a different configuration until it no longer throws
>>> any).  In that case, we do not want its output ending up in the test
>>> output.
>>> It may still be useful for handling the error, though, so add a new
>>> function that works basically like qemu_nbd(), only that it returns the
>>> qemu-nbd output instead of making it end up in the log.  In contrast to
>>> qemu_img_pipe(), it does still return the exit code as well, though,
>> In contrast to qemu_nbd(),
> But qemu_nbd() does return the exit code.  qemu_img_pipe() doesn't.

Oh, I see where I got confused. I thought you were comparing the new
code [qemu_nbd_pipe] to itself; not to the pre-existing qemu_img_pipe
that is not touched by this patch, but which served as the model you
copied after.

>>> because that is even more important for error handling.
>>> Signed-off-by: Max Reitz <address@hidden>
>>> ---
>>>  tests/qemu-iotests/iotests.py | 14 ++++++++++++++
>>>  1 file changed, 14 insertions(+)

>> Reviewed-by: Eric Blake <address@hidden>
> Thanks for reviewing!

Although my questions on patch 3 call into question whether you even
need this patch, if your only use of it was to find a free port.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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