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

[858585 jemmy <jemmy858585@gmail.com>]

On Mon, Apr 10, 2017 at 1:07 PM, wayen <1662050@bugs.launchpad.net> wrote:
> Hi Lidong Chen:
>     I used QEMU 2.0.0 on Ubuntu 14.04.
>     Do you mean your patch can make qemu-img convert qcow2 overlay into a new overlay?

yes. but i find it already fixed in 2.0.0.
do you add the -o backing_file= option in the command?

>
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> https://bugs.launchpad.net/bugs/1662050
>
> Title:
>   qemu-img convert a overlay qcow2 image into a entire image
>
> Status in QEMU:
>   Incomplete
>
> Bug description:
>   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 don't want to get a complete image.I just want to convert
>   delta qcow2 image file "A" to a New delta overlay qcow2 image "B"
>   which is equivalent to "A". 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 qcow2 overlay itself?
>
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