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

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

On 20/01/2025 at 00:01, Pascal Hambourg wrote:
> Possible mitigations/solutions:
(...)
> 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.
>
> 4) Modify parted_server to add a new SET_FLAG command which sets a 
> single flag and use it in synchronization scripts.
> Downside: requires a change in all affected packages.
>
> I think solution #3 is the best because it requires changes only in 
> partman-base to fully fix the issue.

At least in the short term (for trixie ?). But I think solution #4 would 
be better, simpler and more reliable in the long term without the need 
to classify flags. I implemented the SET_FLAG command in parted_server 
and tested it successfully with the "boot" flag.

<https://salsa.debian.org/pham/partman-base/-/commits/set_flag/>