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

On Tue, May 17, 2016 at 5:48 PM, Richard W.M. Jones <rjones(a)redhat.com&gt; 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#L... > > 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... 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.

[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 >