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



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

Rich.

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