Rust package not updating

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1

I want the newest cargo version (1.85.0) but I only have 1.84.0 even after using an unstable flake:


{
  description = "Rust development environment";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        # Read the file relative to the flake's root
        overrides = (builtins.fromTOML (builtins.readFile (self + "/rust-toolchain.toml")));
        libPath = with pkgs; lib.makeLibraryPath [
          # load external libraries that you need in your rust project here
        ];
      in
      {
        devShells.default = pkgs.mkShell rec {
          nativeBuildInputs = [ pkgs.pkg-config ];
          buildInputs = with pkgs; [
            clang
            llvmPackages.bintools
            rustup
          ];

          RUSTC_VERSION = overrides.toolchain.channel;
          
          # https://github.com/rust-lang/rust-bindgen#environment-variables
          LIBCLANG_PATH = pkgs.lib.makeLibraryPath [ pkgs.llvmPackages_latest.libclang.lib ];
          
          shellHook = ''
            export PATH=$PATH:''${CARGO_HOME:-~/.cargo}/bin
            export PATH=$PATH:''${RUSTUP_HOME:-~/.rustup}/toolchains/$RUSTC_VERSION-x86_64-unknown-linux-gnu/bin/
          '';

          # Add precompiled library to rustc search path
          RUSTFLAGS = (builtins.map (a: ''-L ${a}/lib'') [
            # add libraries here (e.g. pkgs.libvmi)
          ]);
          
          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath (buildInputs ++ nativeBuildInputs);

          
          # Add glibc, clang, glib, and other headers to bindgen search path
          BINDGEN_EXTRA_CLANG_ARGS =
          # Includes normal include path
          (builtins.map (a: ''-I"${a}/include"'') [
            # add dev libraries here (e.g. pkgs.libvmi.dev)
            pkgs.glibc.dev
          ])
          # Includes with special directory paths
          ++ [
            ''-I"${pkgs.llvmPackages_latest.libclang.lib}/lib/clang/${pkgs.llvmPackages_latest.libclang.version}/include"''
            ''-I"${pkgs.glib.dev}/include/glib-2.0"''
            ''-I${pkgs.glib.out}/lib/glib-2.0/include/''
          ];
        };
      }
    );
}

Here my version:


$ cargo -V
cargo 1.84.0 (66221abde 2024-11-19)

I updated the flake and everything why does this happen?

2

This overrides whatever you may get from nixpkgs with what you installed from rustup. If your toolchain file is set up to use the wrong version you will. It doesn’t matter if you update your flake or not, and you rely on having used rustup to install that version beforehand, so there’s a good chance you even end up without rust at all in this shell.

I’d recommend committing to either using rustup or nix to manage your toolchain, not a weird hand-crafted mix of both. This gives you the worst of both worlds, no reproducibility guarantees, complex syntax that is nonstandard for the ecosystem, and whatever bugs you may personally introduce.

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