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

From: Nir Soffer
Subject: Re: [Qemu-block] [Qemu-devel] [PATCH RFC] qemu-io: Prefer stderr for error messages
Date: Fri, 14 Dec 2018 00:13:53 +0200

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:

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