Re: Storing command line options in qcow2 images

Anthony Liguori
2007-08-08T18:02:51Z

Avi Kivity wrote:
> Anthony Liguori wrote:
>
>> I don't think adding annotations as snapshots is the right approach. I
>> think proper support should be added in the header. I wouldn't be too
>> concerned with breaking compatibility in qcow2. That's why it's qcow2
>> and not just an updated version of qcow, qcow2 is still, AFAIK, open for
>> breakage.
>>
>>
>
> Are all the users' images open for breakage too?
>

FWIW, you can extended the header without causing a breakage. Just bump
the version, add the field, and add appropriate code. Of course, this
is technically qcow v3 but it's a good opportunity to make things a bit
sanier such that instead of check version == QCOW_VERSION that version
>= QCOW_VERSION.

Regards,

Anthony Liguori