Then, a filesystem update wants to add a new system user, so it updates the file /usr/lib/sysusers.d/archlinux.conf. The .install script runs systemd-sysusers and... nothing happens, because this program only creates the file when there is not there in the first place.
In fact no, it add the new user/group (I just tested). Try running `systemd-sysusers`, add a user in /usr/lib/sysusers.d/base.conf then run `systemd-sysusers`.
The problem is similar. Once I have modified an existing file in /etc, what will happen when a new version of the file comes from the package. Will it not be installed? Or will it overwrite my own file? Maybe you can convice systemd-tmpfiles to copy the file to /etc/watever.pacsave, I don't know. But then, where is the advantage?
Yes, I didn't thought about pacnew, dummy I am... I wrote about /usr/share/etc for the stateless boot stuff (cf link from my previous mail), which is pretty cool. Maybe for this time we could let them in /etc.
