[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.
Rich.
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