Hi folks, I want to experiment with eBPF on NixOS and I noticed bpfman does what I want to do. The project is written in Rust but not yet packaged in Nix, so I am taking a stab at it. However, I am encountering an issue with a dependency:

❯ nix build .#bpfman
warning: Git tree '/home/pim/git/forks/nixpkgs' is dirty
error: builder for '/nix/store/b8216af5njppj5n96aw7m22gvh62fyk7-bpfman-0.5.4.drv' failed with exit code 101;
       last 25 log lines:
       > Caused by:
       >   process didn't exit successfully: `/build/source/target/release/build/aya-rustc-llvm-proxy-9b328a409e2e9087/build-script-build` (exit status: 101)
       >   --- stderr
       >   thread 'main' panicked at /build/bpfman-0.5.4-vendor/aya-rustc-llvm-proxy-0.9.3/build.rs:10:10:
       >   Unable to parse 'llvm-sys' crate: Unable to get crate metadata
       >
       >   Caused by:
       >       `cargo metadata` exited with an error: error: failed to get `libc` as a dependency of package `aya-rustc-llvm-proxy v0.9.3 (/build/bpfman-0.5.4-vendor/aya-rustc-llvm-proxy-0.9.3)`
       >
       >       Caused by:
       >         failed to load source for dependency `libc`
       >
       >       Caused by:
       >         Unable to update registry `crates-io`
       >
       >       Caused by:
       >         failed to update replaced source registry `crates-io`
       >
       >       Caused by:
       >         failed to read root of directory source: /build/bpfman-0.5.4-vendor/@vendor@
       >
       >       Caused by:
       >         No such file or directory (os error 2)
       >
       >   note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
       For full logs, run 'nix log /nix/store/b8216af5njppj5n96aw7m22gvh62fyk7-bpfman-0.5.4.drv'.

{
  lib,
  rustPlatform,
  fetchFromGitHub,
  llvmPackages_12,
  pkg-config,
  openssl,
  ...
}:
rustPlatform.buildRustPackage rec {
  pname = "bpfman";
  version = "0.5.4";

  src = fetchFromGitHub {
    owner = "bpfman";
    repo = "bpfman";
    rev = "refs/tags/v${version}";
    hash = "sha256-CRYp1ktmmY4OS23+LNKOBQJUMkd+GXptBp5LPfbyZAc=";
  };

  useFetchCargoVendor = true;
  cargoHash = "sha256-sLxDj4ftc6te67wnYE7bXWC8O+CMVk9lVrLcQT5Q0gk=";

  doCheck = false;

  nativeBuildInputs = [ llvmPackages_12.llvm pkg-config ];
  buildInputs = [openssl];

  meta = with lib; {
    description = "An eBPF Manager for Linux and Kubernetes";
    mainProgram = "bpfman";
    homepage = "https://bpfman.io";
    license = with licenses; [
      # asl20
      # bsd2
      # gpl2Only
    ];
    maintainers = with maintainers; [  ];
    # broken = stdenv.buildPlatform != stdenv.hostPlatform;
  };
}

{
  lib,
  rustPlatform,
  fetchFromGitHub,
  llvmPackages_12,
  pkg-config,
  openssl,
  ...
}:
rustPlatform.buildRustPackage rec {
  pname = "bpfman";
  version = "0.5.4";

  src = fetchFromGitHub {
    owner = "bpfman";
    repo = "bpfman";
    rev = "refs/tags/v${version}";
    hash = "sha256-CRYp1ktmmY4OS23+LNKOBQJUMkd+GXptBp5LPfbyZAc=";
  };

  useFetchCargoVendor = true;
  cargoHash = "sha256-sLxDj4ftc6te67wnYE7bXWC8O+CMVk9lVrLcQT5Q0gk=";

  doCheck = false;

  nativeBuildInputs = [ llvmPackages_12.llvm pkg-config ];
  buildInputs = [openssl];
}

In reply to @pim:envs.net
I think you forgot to replace the repo in your pastebin with bpfman

In reply to @luke:vuksta.com
This has probably been asked before, but what is the right way to use a nightly toolchain with crane? I don't see it from a cursory search