Re: [Qemu-devel] [PATCH v3 2/5] blkdebug: Add pass-through write_zero and discard support

[Eric Blake]

On 12/06/2016 04:23 PM, Max Reitz wrote:
> On 06.12.2016 23:18, Eric Blake wrote:
>> On 12/06/2016 04:14 PM, Max Reitz wrote:
>>> On 06.12.2016 23:12, Eric Blake wrote:
>>>> On 12/06/2016 04:00 PM, Max Reitz wrote:
>>>>
>>>>>> Tested by setting up an NBD server with export 'foo', then invoking:
>>>>>> $ ./qemu-io
>>>>>> qemu-io> open -o driver=blkdebug blkdebug::nbd://localhost:10809/foo
>>>>
>>>> By the way, I'd LOVE to know if there is a way to write a qemu-io
>>>> command line that would do this connection automatically (so that I can
>>>> batch commands up front and benefit from the shell's history) rather
>>>> than having to issue an 'open' after the fact.  I tried various
>>>> incantations with --object and --image-opts, but got stumped.
>>>
>>> Can't you just do qemu-io -c 'open'?
>>
>> I suppose that would get command-line history.  But I still want
>> interactive mode.  The moment you use -c, ALL commands get run
>> back-to-back without stopping, so I'd have to add additional -c
>> 'read'/'write' commands up front. I like interactive mode (open
>> pre-connected, now let me explore the image at will).
> 
> Well, the usual --image-opts version would be:
> 
> ./qemu-io --image-opts driver=blkdebug,image.driver=nbd,\
> image.host=localhost,image.export=foo

Thanks, that appears to do the trick! I think I was getting confused by
trying 'file.driver' instead of 'image.driver', or maybe it was because
I was trying 'image.align' to set the blkdebug alignment where just
plain 'align' works once you are in --image-opts mode, or some such
problem on my end.  [Maybe I shouldn't be testing patches late at night,
either...]

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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