[Libguestfs] Can I specify qcow2 preallocation method with virt-builder?

[Yaniv Kaul]

On Tue, May 17, 2016 at 5:48 PM, Richard W.M. Jones <rjones at redhat.com>
wrote:

> On Tue, May 17, 2016 at 03:41:53PM +0100, Richard W.M. Jones wrote:
> > On Tue, May 17, 2016 at 05:15:57PM +0300, Yaniv Kaul wrote:
> > > When creating qcow2 images using virt-builder, is there a way to
> specify
> > > the qcow2 preallocation, as possible with qemu-img create -o
> > > preallocation=metada , for example?
> >
> > No .. but .. it does default to preallocation=metadata provided that
> > the output format is qcow2:
> >
> >
> https://github.com/libguestfs/libguestfs/blob/master/builder/builder.ml#L582-L585
>
> I should say this only applies when the image needs to be resized
> (ie. you supply a --size parameter which != the size of the template),
> AND if the resize is the final step that the planner comes up with.
>
>
> https://rwmj.wordpress.com/2013/12/14/writing-a-planner-to-solve-a-tricky-programming-optimization-problem/


Oh. I don't think there[1] is any need to resize in the code, it's just
directly using the templates virt-builder uses, AFAIK.
Y.

[1]
https://github.com/lago-project/lago-images/blob/inital-setup/bin/build.py


>
> In the general case implementing this is more complicated.  I think it
> would require another planner transition.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-top is 'top' for virtual machines.  Tiny program with many
> powerful monitoring features, net stats, disk stats, logging, etc.
> http://people.redhat.com/~rjones/virt-top
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/libguestfs/attachments/20160517/6e77122b/attachment.htm>