Re: [Qemu-devel] [PATCH 0/2] Update documentation for qemu-img + add new -B option

[Jamie Lokier]

Marc Bevand wrote:
> Thanks for the review, Anthony. I made the changes you request --sorry
> about the line wraps. I split the patch in 2 parts to isolate the
> unrelated change I made to qemu-img.texi in its own changeset.

I wonder if a useful option would be to be able to create an image
relative to a _different_ base image.  I.e.

   - convert old flat image  to  new relative image, given new base

   - convert old relative + old base  to  new relative image, given new base

Another thing, which might be easier and more useful, would be
instantiating zeros in the source image into holes in the relative
image.  To save space, after lots of changes on the virtual hard disk
and some zeroing.  (Microsoft has a tool to do this with Virtual PC).

-- Jamie