How to prioritize magic-nix over flake-defined substituters?

[locallycompact]

If there are extra-substituters defined in the flake, then nix will prioritize pulling from those and not pull from localhost very often. How can this be overridden?

[cole-h]

We could increase the priority (by lowering the value):

magic-nix-cache/magic-nix-cache/src/binary_cache.rs

Line 32 in ef5c9ec

Priority: 41

I don't remember if it was a conscious decision to make it a lower priority (with a higher value), or if that was just a mistake, though; it may not be that simple.

[dermetfan]

I was under the impression that the priority is locally forced to 1 here:

magic-nix-cache/magic-nix-cache/src/main.rs

Line 280 in ef5c9ec

.write_all(format!("extra-substituters = http://{}?trusted=1&compression=zstd&parallel-compression=true&priority=1\n", args.listen).as_bytes())