On Fri, 10 Jul 2020 at 10:58, Kevin Wolf <kw...@redhat.com> wrote: > > Am 09.07.2020 um 16:15 hat Peter Maydell geschrieben: > > dd/truncate etc won't work if the image file is not raw (eg if > > it's qcow2). The only chance you have of something that's actually > > generic would probably involve "qemu-img resize". But I'm a bit > > wary of having an error message that recommends that, because > > what if we got it wrong? > > What is your concern that we might get wrong? The suggestion is always > extending the size rather than shrinking, so it should be harmless and > easy to undo. (Hm, we should finally make --shrink mandatory for > shrinking. We've printed a deprecation warning for almost three years.)
If there's a qemu-img command line that will always only extend the image size and never let the user accidentally shrink it and throw away data, then great. I'd happily recommend that. thanks -- PMM