Re: [Qemu-devel] [Bug 1662050] Re: qemu-img convert a overlay qcow2 image into a entire image

[Eric Blake]

On 02/05/2017 09:19 PM, wayen wrote:
> 
>   I have a base image file "base.qcow2" and a delta qcow2 image file
>   "delta.qcow2" whose backing file is "base.qcow2".
>   
>   Now I use qemu-img to convert "delta.qcow2" and will get a new image
> + file "new.qcow2" which is entire and equivalent to combination of
>   "base.qcow2" and "delta.qcow2".
>   
>   In fact, i just want to convert the delta qcow2 image file and get a new
>   delta overlay qcow2 image file. So the "new.qcow2" is not what i want. I
>   have to admit that this is not bug. Could you please take this as a new
>   feature and enable qemu-img to convert images in-place?

This feature already exists.  Use:

qemu-img rebase -F $backing_fmt -b '' -f qcow2 delta.qcow2

and now delta.qcow2 will be a complete image.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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