Re: [Qemu-devel] [Qemu-block] [PATCH RFC] qemu-io: Prefer stderr for error messages

[Nir Soffer]

On Thu, Dec 13, 2018 at 11:27 PM Eric Blake <address@hidden> wrote:

> On 12/13/18 11:44 AM, Nir Soffer wrote:
>
> >> The things is, qemu-io was never meant to be used by other
> >> applications that need to process the results, it's a tool for testing
> >> and debugging. If we had meant it to be used by other programs, we would
> >> have given it a machine-friendly interface.
> >>
> >> The machine-friendly interface to the QEMU block layer is qemu-nbd.
> >>
> >
> > nbd is awesome, but much more complicated to use for testing. You need
> to:
> >
> > 1. start qemu-nbd
> > 2. wait until it is ready
> > 3. use nbd client (we have one now), or connect the qemu-nbd to
> /dev/ndbX,
> > which on
> >    Fedora 28 leaves stale /dev/nbdX devices after disconnection
> >    (I reported this few month ago here).
>
> Is that true even when you use 'qemu-nbd -d /dev/nbdX' after you are done?
>

It was true when I reported this here:
http://lists.nongnu.org/archive/html/qemu-block/2018-07/msg00168.html