{  lib,  stdenv,  rustPlatform,  gitRev ? null,  git,  gnupg,  installShellFiles,  mold,  openssh,}: let  packageVersion = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).workspace.package.version;  filterSrc = src: regexes:    lib.cleanSourceWith {      inherit src;      filter = path: type: let        relPath = lib.removePrefix (toString src + "/") (toString path);      in        lib.all (re: builtins.match re relPath == null) regexes;    };in  rustPlatform.buildRustPackage {    pname = "jujutsu";    version = "${packageVersion}-unstable-${      if gitRev != null      then gitRev      else "dirty"    }";     cargoBuildFlags = ["--bin" "jj"]; # don't build and install the fake editors    useNextest = true;    cargoTestFlags = ["--profile" "ci"];    src = filterSrc ./. [      ".*\\.nix$"      "^.jj/"      "^flake\\.lock$"      "^target/"    ];     cargoLock.lockFile = ./Cargo.lock;    nativeBuildInputs =      [        installShellFiles      ]      ++ lib.optionals stdenv.isLinux [        mold      ];    buildInputs = [];    nativeCheckInputs = [      # for signing tests      gnupg      openssh       # for git subprocess test      git    ];     env = {      RUST_BACKTRACE = 1;      CARGO_INCREMENTAL = "0"; # https://github.com/rust-lang/rust/issues/139110      RUSTFLAGS = lib.optionalString stdenv.isLinux "-C link-arg=-fuse-ld=mold";      NIX_JJ_GIT_HASH = gitRev;    };     postInstall = ''      $out/bin/jj util install-man-pages man      installManPage ./man/man1/*       installShellCompletion --cmd jj \        --bash <(COMPLETE=bash $out/bin/jj) \        --fish <(COMPLETE=fish $out/bin/jj) \        --zsh <(COMPLETE=zsh $out/bin/jj)    '';     meta = {      description = "Git-compatible DVCS that is both simple and powerful";      homepage = "https://github.com/jj-vcs/jj";      license = lib.licenses.asl20;      mainProgram = "jj";    };  }