Bug#1132612: gsettings-desktop-schemas: keep primary paste (middle-click) enabled for existing accounts?

[Simon McVittie]

On Fri, 03 Apr 2026 at 14:26:34 -0400, Jeremy Bícha wrote:
>On Fri, Apr 3, 2026 at 1:59 PM Simon McVittie <smcv at debian.org> wrote:
>> The script has Ubuntuisms like /var/log/installer/media-info so it isn't
>> directly applicable to Debian, but hopefully someone who knows the
>> user-session-migration interface better can adapt it for Debian.
>
>The Debian installer does create log files which can be used to
>similarly detect how old a Debian install is. But an install done with
>Debian Live (Calamares) does not appear to create similar log files.

Can we perhaps do something like this?

* preinst:
   - if upgrade from version < 50.0 ($1 = upgrade, $2 < 50.0)
     - create /var/lib/gsettings-desktop-schemas/older-than-v50.stamp

* user-session-migration:
   - if /var/lib/gsettings-desktop-schemas/older-than-v50.stamp exists:
     - perform migration for the current user

* postrm:
   - if purge:
     - rm -f /var/lib/gsettings-desktop-schemas/older-than-v50.stamp
     - rmdir --ignore-fail-on-non-empty /var/lib/gsettings-desktop-schemas

I think that does what we want:

* Scenario 1: fresh install of forky
   - gsettings-desktop-schemas is installed for the first time at v50.0
   - preinst doesn't create the flag file
   - u-s-m runs the migration (once per user on next login) but it does nothing
   - postrm purge cleans up

* Scenario 2: upgrade (old versions to) trixie to forky
   - g-d-s is installed for the first time at v48.x or older
   - eventually g-d-s is upgraded to v50.0
   - preinst sees that this is an upgrade from v48/v49 to v50 and creates
     the flag file
   - u-s-m runs the migration (once per user on next login) and it
     actually takes effect
   - postrm purge cleans up, as before

(And then after the forky release, in the duke release cycle, we can 
remove the u-s-m migration and make the maintainer scripts delete 
/var/lib/gsettings-desktop-schemas/older-than-v50.stamp unconditionally, 
instead.)

     smcv