Re: [Qemu-devel] [Libguestfs] [qemu-img] support for XVA

[Max Reitz <mreitz@redhat.com>]

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On 2017-11-15 21:24, Richard W.M. Jones wrote:
> On Wed, Nov 15, 2017 at 09:07:12PM +0100, Max Reitz wrote:
>> On 2017-11-15 21:06, Gandalf Corvotempesta wrote:
>>> 2017-11-15 20:59 GMT+01:00 Max Reitz <mreitz@redhat.com>:
>>>> Well, you can't just add support to qemu-img alone either.  Every image
>>>> format supported by qemu-img is one supported by qemu as a whole and
>>>> thus needs a proper block driver that needs to support random accesses
>>>> as well.
>>>
>>> I was talking about qemu-img convert, just to convert an XVA image to
>>> something different, in a single pass, without having to extract the
>>> tar.
>>
>> I know, but that doesn't work.  qemu-img convert uses the normal
>> general-purpose block drivers for that.
> 
> In any case there's no need as qemu/qemu-img can already access files
> inside an uncompressed tarball using the offset/size support added to
> the raw driver exactly for this purpose:
> 
> https://lists.gnu.org/archive/html/qemu-devel/2016-10/msg03945.html

If that works, yes.  To me it doesn't look like XVA is just a single raw
image inside of a tarball, but I may very well be wrong, of course.

Max


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