Libguestfs - Apr 2022 - Virt-install, virt-customize, virt-builder

I want to achieve the external data file creation 

"qemu-img create -o data_file_raw=on,data_file=path/to/file" 

but there is no way to specify those options while using virt-builder.

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Nguetchouang Ngongang Kevin
ENS de Lyon
https://perso.ens-lyon.fr/kevin.nguetchouang/ 

Le 2022-04-25 16:17, Richard W.M. Jones a ?crit :
> On Mon, Apr 25, 2022 at 02:42:18PM +0200, Nguetchouang Ngongang Kevin
wrote:
> 
>> Hello everyone, i got 2 questions and I hope you could help me ?
> 
>> * is it possible to specify extra options of qemu-img (when
>> creating/building image/os using virt-install and virt-builder ?)
> 
> Could be useful to know what particular options you are interested in.
> Maybe qemu-img create "-o" stuff?
> 
>> * Is it possible to rebuild another os (in the manner of
>> virt-builder) on an existing image file but by using virt-customize?
> 
> I'm not totally sure what this question means.  virt-builder is really
> a tool that downloads and uncompresses templates (from:
> https://builder.libguestfs.org/ and other places) and then customizes
> them using the same code as used in virt-customize.  So you can split
> up the two tasks yourself easily enough, if that's what you mean.
> Virt-customize can be used across many different OSes.
> 
> Rich.
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On Mon, Apr 25, 2022 at 04:40:15PM +0200, Nguetchouang Ngongang Kevin
wrote:
> I want to achieve the external data file creation
> 
> "qemu-img create -o data_file_raw=on,data_file=path/to/file"
> 
> but there is no way to specify those options while using virt-builder.
Interesting - I had no idea about this feature before.

At the moment it's not possible to do this within virt-builder,
without patching virt-builder.  I guess maybe you can post-convert the
file after virt-builder has run?

I grepped the source of virt-install and it doesn't seem like it has
support either.  Nor does libvirt.

It should be possible to use virt-customize on these special qcow2
files, although I didn't try it.

Rich.

-- 
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