Re: [PATCH 2/2] hw/sd/sdcard: Do not allow invalid SD card sizes

[Peter Maydell]

On Fri, 10 Jul 2020 at 10:58, Kevin Wolf <kwolf@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