[elbe-users] Image with flat BTRFS Layout

[Thomas Weißschuh]

Hi Steffen,

On Mon, Nov 18, 2024 at 12:31:13PM +0000, Müller, Steffen - LT wrote:
[..]

> Now I want to implement a flat BTRFS design:
> https://archive.kernel.org/oldwiki/btrfs.wiki.kernel.org/index.php/SysadminGuide.html#Subvolumes

[..]

> The image generation does work. But both subvolumes are empty and the
> Debian image is installed on the subvolume=/.  In addition the home
> directory is empty too.
> 
> Can someone help me?

When copying filesystems to partitions currently only one, the last,
entry defined in the XML is used.
This may work by chance if a nested layout, where subvol names match
their mountpoints, is used but for flat ones it breaks as you observe.
Also mount options are not applied during building which would also be
required to support the XML configuration you used.

In my opinion it makes sense to get rid of this assumption.
But coming up with something that can handle all usecases
(also for example where one filesystem spans multiple block devices)
will be some work.


Regards,
Thomas