Re: [Qemu-devel] [PATCH] block: don't register quorum driver if SHA256 support is unavailable

["Daniel P. Berrange" <berrange@redhat.com>]

On Tue, Aug 04, 2015 at 04:48:25PM +0200, Sascha Silbe wrote:
> Commit 488981a4 [block: convert quorum blockdrv to use crypto APIs]
> broke qemu-iotest 041 on hosts with GnuTLS < 2.10.0. It converted a
> compile-time check to a run-time check at device open time. The result
> is that we now advertise a feature (the quorum block driver) that will
> never work (on those hosts). There's no way (short of parsing
> human-readable error messages) for qemu-iotests or any other API
> consumer to recognise that the quorum block driver isn't _actually_
> available and shouldn't be used or tested.
> 
> Move the run-time check to bdrv_quorum_init() to avoid registering the
> quorum block driver if we know it cannot work. This way API consumers
> can recognise it's unavailable.
> 
> Fixes: 488981a4af396551a3178d032cc2b41d9553ada2
> Signed-off-by: Sascha Silbe <silbe@linux.vnet.ibm.com>

Reviewed-by: Daniel P. Berrange <berrange@redhat.com>

Regards,
Daniel
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