rust: failing to vendor dependency of sub-directory

[DavHau]

The rust project nitrokey-3-firmware seemed to be troublesome to package with current nixpkgs tooling during summer of nix due to an issue with parsing and fetching the git revision correctly.

I just tried with dream2nix and it fails with an other error. Vendoring the dependency of a sub directory seems to fail. flake.nix:

{
  inputs.dream2nix.url = "github:nix-community/dream2nix";
  inputs.src.url = "github:Nitrokey/nitrokey-3-firmware";
  inputs.src.flake = false;
  outputs = inp:
    inp.dream2nix.lib.makeFlakeOutputs {
      systemsFromFile = ./nix_systems;
      config.projectRoot = ./.;
      source = inp.src;
    };
}

error:

runner> error: failed to get `fm11nc08` as a dependency of package `runner v1.0.4 (/build/lpc55)`

@sbruder created a minimal reproducibel example of the problem here: https://github.com/sbruder/nix-cargo-two-unpinned-dependencies/blob/master/Cargo.lock This as well fails with dream2nix, but this time with another error than the flake above:

nix-cargo-two-unpinned-dependencies>     Updating git repository `https://github.com/rust-lang/libc`
nix-cargo-two-unpinned-dependencies> error: failed to get `libc` as a dependency of package `subproject v0.1.0 (/build/2340gklvaqqbmibp3z875282cmi8bj55-source/subproject)`
nix-cargo-two-unpinned-dependencies>     ... which satisfies path dependency `subproject` (locked to 0.1.0) of package `nix-cargo-two-unpinned-dependencies v0.1.0 (/build/2340gklvaqqbmibp3z875282cmi8bj55-source)`

@yusdacra

[90-008]

I made https://github.com/nix-community/dream2nix/pull/223 which gets rid of that error, but I still get an error related to a vendored dependency, i'll look into it later.

[90-008]

I got further since the duplicate version issue is resolved now:

{
  inputs.dream2nix.url = "github:nix-community/dream2nix/fix/rust-issues";
  inputs.src.url = "github:Nitrokey/nitrokey-3-firmware";
  inputs.src.flake = false;
  outputs = inp:
    let pkgs = inp.dream2nix.inputs.nixpkgs.legacyPackages.x86_64-linux; in
    inp.dream2nix.lib.makeFlakeOutputs {
      systemsFromFile = ./nix_systems;
      config.projectRoot = ./.;
      source = inp.src;
      packageOverrides = {
        runner.add-deps = {
          stdenv = pkgs.stdenvClang;
          nativeBuildInputs = old: old ++ (with pkgs; [libllvm libclang.lib]);
          LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
        };
      };
    };
}

and run nix build .#runner:

error: builder for '/nix/store/i5igc61rnwffzfm4zhy2mynvnzw219hg-runner-1.1.0.drv' failed with exit code 101;
       last 10 log lines:
       >   exit status: 0
       >   cargo:rustc-link-lib=static=lfs-sys
       >   cargo:rustc-link-search=native=/build/lpc55/target/x86_64-unknown-linux-gnu/release/build/littlefs2-sys-c8843d5c7cd9bba1/out
       >
       >   --- stderr
       >   littlefs/lfs.h:10:10: fatal error: 'stdint.h' file not found
       >   littlefs/lfs.h:10:10: fatal error: 'stdint.h' file not found, err: true
       >   thread 'main' panicked at 'Unable to generate bindings: ()', /build/lpc55/../nix-vendor/littlefs2-sys-0.1.6/build.rs:33:10
       >   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       > warning: build failed, waiting for other jobs to finish...

[sbruder]

I also hit this problem while trying to build it with rustPlatform.buildRustPackage and managed to solve it by adding clang to nativeBuildInputs. I don’t know why that is needed, but it solves the issue.

After adding this, the build fails with a different error message, because it needs one board selected as crate feature.

[90-008]

Yes, I was able to select a feature by passing cargoBuildFeatures = ["board-solo2"], but it does not build anyhow because it needs a custom target (?). I'm not sure how to test further without getting it to build and tinkering, but this specific issue seems to be fixed (after #223 is merged). Latest flake.nix if anyone's interested:

{
  inputs.dream2nix.url = "github:nix-community/dream2nix/fix/rust-issues";
  inputs.src.url = "github:Nitrokey/nitrokey-3-firmware";
  inputs.src.flake = false;
  outputs = inp:
    let pkgs = inp.dream2nix.inputs.nixpkgs.legacyPackages.x86_64-linux; in
    inp.dream2nix.lib.makeFlakeOutputs {
      systemsFromFile = ./nix_systems;
      config.projectRoot = ./.;
      source = inp.src;
      packageOverrides = {
        runner.add-deps = {
          doCheck = false;
          cargoBuildFeatures = ["board-solo2"];
          nativeBuildInputs = old: old ++ [pkgs.clang];
          LIBCLANG_PATH = "${pkgs.libclang.lib}/lib";
        };
      };
    };
}

[90-008]

This specific issue is solved, so I'll close this and someone can open another issue if there are any other issues that pertain to dream2nix