[arch-general] pacman new generation

[Bernardo Barros]

If I still may:

roll-back and reproducible configuration was already proposed in the past?

The idea raised by Nix devs was the a purely functional approach was a
way to implement it. Of course people can have similar ideas with
other techniques.

If it a very practical question because I'm sure all Arch users in
some point or another had to do a roll-back after a complex system
update, and then they find themselves in a difficult situation to
figure out how to revert all those changes.

Pro Audio users, for instance, might want to have their system
configuration in a state just before the change that broke lv2 support
on Ardour.

Nix approach may be not the only one, but their ideas let people see
the difference between same packages build with different libs, or
know to set a exact system configuration more easily.