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

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(a)redhat.com&gt;: >>>> 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.