fcntl-tool 0.2.0

Your small yet useful swiss army knife for the `fcntl` system call, specifically for acquiring and testing file locks, but not limited to those. 
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{
  description = "fcntl-tool";

  inputs = {
    # We follow the latest stable release of nixpkgs
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
  };

  outputs =
    inputs@{ self, nixpkgs, ... }:
    let
      # Systems definition for dev shells and exported packages,
      # independent of the NixOS configurations and modules defined here. We
      # just use "every system" here to not restrict any user. However, it
      # likely happens that certain packages don't build for/under certain
      # systems.
      systems = nixpkgs.lib.systems.flakeExposed;
      forAllSystems =
        function: nixpkgs.lib.genAttrs systems (system: function nixpkgs.legacyPackages.${system});
    in
    {
      formatter = forAllSystems (pkgs: pkgs.nixfmt-tree);
      packages = forAllSystems (pkgs: {
        default = pkgs.rustPlatform.buildRustPackage rec {
          src =
            let
              fs = pkgs.lib.fileset;
            in
            fs.toSource {
              root = ./.;
              fileset = fs.gitTracked ./.;
            };
          name = "fcntl-tool";
          cargoDeps = pkgs.rustPlatform.importCargoLock {
            lockFile = ./Cargo.lock;
          };
        };
      });
    };
}