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Expose the Rust kernel's import-from-derivation input - #122
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Evaluating a Rust environment forces Cargo-nix: overrideInputs imports its crate-names.nix and vendorDependencies callPackages its default.nix. Nothing the environment produces refers to it, so it is absent from the closure a consumer would seed a binary cache with, and an offline builder cannot evaluate the environment at all.
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Evaluating a Rust environment forces
Cargo-nix:overrideInputsimports itscrate-names.nixandvendorDependenciescallPackages itsdefault.nix. Nix has to realise it before it can finish evaluating the environment, and so before it can substitute the environment's own output.Nothing the environment produces refers to
Cargo-nix, so it is absent from the closure, and a consumer that seeds a binary cache from that closure leaves an offline builder unable to evaluate the environment at all. It falls back to building a stdenv from source and dies fetchingstage0-posix.makeEnvironmentnow carriespassthru.evalTimeDerivations, collected from the kernels, language servers, exporters and packages it built. The Rust kernel is the only current contributor; everything else yields an empty list. Nothing is added to any output, so no derivation changes.Consumed by codedown's test binary cache, which adds these to its root paths.