Drop systemd_pre

[kkaempf]

It does not exist 🤦

[anmazzotti]

This looks good. However I do wonder why we use pre and post. Shouldn't service_add_post and service_del_preun be enough?

Also regarding the systemd_preun, I think it actually prevents the restart if I read this doc. I think systemd_postun_with_restart should be used instead.

Anyway not related to this PR.

[kkaempf]

Well, we just follow the openSUSE systemd packaging guidelines (resp. the Fedora one's) here 🤷🏻

[kkaempf]

Also regarding the systemd_preun, I think it actually prevents the restart if I read this doc. I think systemd_postun_with_restart should be used instead.

Yes, I thought about this. But since we're not doing package-based updates, this is not relevant and I decided to use systemd_preun (which, strictly speaking, wouldn't be needed either).