From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1LL4EI-0006nJ-8p
	for qemu-devel@nongnu.org; Thu, 08 Jan 2009 18:23:58 -0500
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1LL4EG-0006m8-Fj
	for qemu-devel@nongnu.org; Thu, 08 Jan 2009 18:23:57 -0500
Received: from [199.232.76.173] (port=35020 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1LL4EG-0006lw-8S
	for qemu-devel@nongnu.org; Thu, 08 Jan 2009 18:23:56 -0500
Received: from yx-out-1718.google.com ([74.125.44.157]:25644)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <anthony@codemonkey.ws>) id 1LL4EG-0005gZ-1N
	for qemu-devel@nongnu.org; Thu, 08 Jan 2009 18:23:56 -0500
Received: by yx-out-1718.google.com with SMTP id 3so3408068yxi.82
	for <qemu-devel@nongnu.org>; Thu, 08 Jan 2009 15:23:55 -0800 (PST)
Message-ID: <49668B01.60002@codemonkey.ws>
Date: Thu, 08 Jan 2009 17:23:45 -0600
From: Anthony Liguori <anthony@codemonkey.ws>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] qemu: block.c: introducing "fmt:FMT:" prefix to
	image-filenames
References: <496642BD.4010706@redhat.com>
	<20090108185256.GA8669@redhat.com>	<49664F54.7050908@redhat.com>
	<20090108191301.GB8669@redhat.com>	<496650ED.1060602@redhat.com>
	<20090108231854.GB12848@shareable.org>
In-Reply-To: <20090108231854.GB12848@shareable.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Reply-To: qemu-devel@nongnu.org
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: qemu-devel@nongnu.org

Jamie Lokier wrote:
> Uri Lublin wrote:
>   
>> Daniel P. Berrange wrote:
>>     
>>> Yes the format you write into the qcow2 header can still use the 
>>> fmt:qcow2: prefix - just no need to expose that particular qcow2
>>> specific implementation detail on the CLI. 
>>>       
>> OK. I'll prepare a patch that adds '-F fmt' to 'qemu-img create -b ...'
>>     
>
> Will it break backing files whose filename begins with "fmt:"?
>
> Just because I hate hidden "some filenames work, some filenames break
> mysteriously, and of course it's not documented" dodgy hacks.
>   

I'm pretty certain that you couldn't do that today in QEMU.  The colon 
has always been used for protocol checking and if the protocol is 
invalid, I think we throw an error.

Regards,

Anthony Liguori

> -- Jamie
>
>
>