systemd: create options for smaller derivation

[kloenk]

Motivation for this change

Base work for #98299

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

[flokli]

@kloenk any chance you could keep this udev = systemd (but update the comment)? Maybe that's also what fails evaluation currently.

Otherwise I'd also gladly massage this in shape :-)

[kloenk]

I can change that. But bigger changes have to wait a little. (School takes much time currently)

[kloenk]

@flokli
replace, or add to the comment?

[flokli]

I'd propose to have that line look like this:

 udev = systemd; # TODO: change to systemdMinimal

So this shouldn't cause any breakage, and we have systemdMinimal available for other tasks.

I can change that. But bigger changes have to wait a little. (School takes much time currently)

No worries!

[flokli]

Sorry, I missed this - this is a mass rebuild, so it'll need to target staging.

[Ericson2314]

I'm not familiar with all our recent systemd decisions. But this PR makes sense to me, and I'm eager to try out homed in the one that depends on it.

@kloenk says the ofborg failure doesn't reproduce locally, so I suspect this is due to ofborg merging a broken master/staging.

[kloenk]

rebased, hopefully this fixes ofborg-eval

[Ericson2314]

Ah good with the udev = systemd; # TODO: change to systemdMinimal this really is quite minimal. I'll just merge then.

In any event, I'm always for exposing more flags on the nix expr level. It gives gentoo people less reason to complain about us :D.