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

[Daniel P . Berrangé]

On Wed, Dec 12, 2018 at 04:04:10PM -0600, Eric Blake wrote:
> When a qemu-io command fails, it's best if the failure message
> goes to stderr rather than stdout.
> 
> Reported-by: Richard W.M. Jones <address@hidden>
> Signed-off-by: Eric Blake <address@hidden>
> ---
> 
> RFC because at least iotest 60 (found by -qcow2 -g quick) breaks due
> to reordering of output lines, and I'd rather know if we like this
> idea before bothering to revisit all affected iotests (including
> discovering if other slower ones have similar problems).

I think the change is correct. Error messages should never go to stdout.

Regards,
Daniel
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