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----
-
-title: "cargo2nix: Dramatically simpler Rust in Nix"
-
-date: 2020-10-05 2
-
-layout: post
-
-lang: en
-
-ref: cargo2nix-dramatically-simpler-rust-in-nix
-
----
-
-In the same vein of my earlier post on
-[swift2nix]({% link _articles/2020-10-05-swift2nix-run-swift-inside-nix-builds.md %}), I
-was able to quickly prototype a Rust and Cargo variation of it:
-[cargo2nix].
-
-
-The initial prototype is even smaller than swift2nix: it has only
-37 lines of code.
-
-[cargo2nix]: https://euandre.org/static/attachments/cargo2nix.tar.gz
-
-Here's how to use it (snippet taken from the repo's README):
-
-```nix
-let
- niv-sources = import ./nix/sources.nix;
- mozilla-overlay = import niv-sources.nixpkgs-mozilla;
- pkgs = import niv-sources.nixpkgs { overlays = [ mozilla-overlay ]; };
- src = pkgs.nix-gitignore.gitignoreSource [ ] ./.;
- cargo2nix = pkgs.callPackage niv-sources.cargo2nix {
- lockfile = ./Cargo.lock;
- };
-in pkgs.stdenv.mkDerivation {
- inherit src;
- name = "cargo-test";
- buildInputs = [ pkgs.latest.rustChannels.nightly.rust ];
- phases = [ "unpackPhase" "buildPhase" ];
- buildPhase = ''
- # Setup dependencies path to satisfy Cargo
- mkdir .cargo/
- ln -s ${cargo2nix.env.cargo-config} .cargo/config
- ln -s ${cargo2nix.env.vendor} vendor
-
- # Run the tests
- cargo test
- touch $out
- '';
-}
-```
-
-That `cargo test` part on line 20 is what I have been fighting with every
-"\*2nix" available for Rust out there. I don't want to bash any of them. All I
-want is to have full control of what Cargo commands to run, and the "*2nix" tool
-should only setup the environment for me. Let me drive Cargo myself, no need to
-parameterize how the tool runs it for me, or even replicate its internal
-behaviour by calling the Rust compiler directly.
-
-Sure it doesn't support private registries or Git dependencies, but how much
-bigger does it has to be to support them? Also, it doesn't support those **yet**,
-there's no reason it can't be extended. I just haven't needed it yet, so I
-haven't added. Patches welcome.
-
-The layout of the `vendor/` directory is more explicit and public then what
-swift2nix does: it is whatever the command `cargo vendor` returns. However I
-haven't checked if the shape of the `.cargo-checksum.json` is specified, or
-internal to Cargo.
-
-Try out the demo (also taken from the repo's README):
-
-```shell
-pushd "$(mktemp -d)"
-wget -O- https://euandre.org/static/attachments/cargo2nix-demo.tar.gz |
- tar -xv
-cd cargo2nix-demo/
-nix-build
-```
-
-Report back if you wish.