Re: [Qemu-block] [Qemu-devel] using "qemu-img convert -O qcow2" to convert qcow v1 to v2 creates a qcow v3 file?

[John Snow]

On 11/14/2017 01:46 PM, Max Reitz wrote:
> On 2017-11-14 19:45, Thomas Huth wrote:
>> On 14.11.2017 14:32, Max Reitz wrote:
>> [...]
>>> Well, do you want to document it?  I'd rather deprecate it altogether.
>>
>> Maybe a first step could be to change qemu-img so that it refuses to
>> create new qcow1 images (but still can convert them into other formats).
>> So basically make qcow1 read-only?
> 
> Yep, and the actual first step to that is to make it issue a deprecation
> warning when creating qcow v1 images (which is what I proposed). :-)
> 
> Max
> 

Deprecation warning is good.

In future versions you can shimmy it behind a
--no-really-I-want-this-old-format option, I think we ought to support
creating the images for as long as is technologically convenient.