Bug#1093565: partman: changing partition usage may leave the wrong type in partition table

[Pascal Hambourg <pascal@plouf.fr.eu.org>]

Control: tags -1 patch

On 20/01/2025 at 00:01, Pascal Hambourg wrote:
> 3) Modify parted_server to set only the last type flag when processing a 
> SET_FLAGS command (all scripts send the new flag last).
> Advantage: no need to change affected packages.
> Downsides: changes SET_FLAGS behaviour; needs to be updated whenever 
> libparted supports a new flag.
(...)
> I think solution #3 is the best because it requires changes only in 
> partman-base to fully fix the issue. However modifying parted_server 
> does not seem easy and my C is rusty

Writing a rough implementation was actually not so hard:
<https://salsa.debian.org/installer-team/partman-base/-/merge_requests/12>