[ovirt-users] Re: Libvirt ERROR cannot access backing file after importing VM from OpenStack

On Wed, May 30, 2018 at 12:11:21AM +0300, Nir Soffer wrote: > Exporting images or ova files: > > image in any format -> qemu-img -> [qcow2 byte stream] -> imageio http > server -> http client You can do this with nbdkit + plugin, it's exactly what we do today for virt-v2v: https://github.com/libguestfs/libguestfs/blob/master/v2v/rhv-upload-plugi...

Importing images or ova files: > > http client -> imageio http server -> [qcow2 byte stream] -> qemu-img -> > image in any format Also could be done with nbdkit + plugin, basically the reverse of the above. > > If you can create a tar file that reserves space for the image file > > without actually writing it, a possible workaround today would be using > > the offset/size runtime options of the raw driver to convert directly > > into a region inside the tar archive. > > > > What are the offset/size runtime options? I cannot find anything about > them in man qemu-img. See: https://github.com/libguestfs/libguestfs/blob/dd162d2cd56a2ecf4bcd40a7f46... But in any case you can just use the nbdkit tar plugin which already does all of this.