Can Nix expression know which flake it came from

Help
1

Can a Nix expression know and make assertions about the flake it was expressed from?

Let’s say I want to make it so only a certain NixOS module option is only ever set in a particular flake from my graph.

2

The most idiomatic way would be to set readOnly = true; on the option declaration so that it can only be set in one place.

3

But then you lose all the merging and stuff eh ?
Maybe there’s a way to add this functionality.

I’ll try to look at the evaluator.
I’d love to define where options can be used.

4

There’s also options.<whatever>.definitionsWithLocation, which uses unsafeGetAttrPos iirc, the former might be an easier interface to work with though.