Building Rust within Nix has always been somewhat of an annoying problem. Nixpkgs includes tools like buildRustCrate to build a single crate and buildRustPackage to build an entire project with all its dependencies, but both have substantial issues: buildRustCrate requires manually specifying every dependency in the entire tree in Nix;

The Nix daemon is a very powerful piece of software. It can reproducibly build tens of thousands of packages from Nixpkgs, securely limited in a small sandbox, triggered by requests from users. It can detect what packages are currently in use and delete unused ones. And it can even build