nix run .# in workspace doesn't work unless version = is set

[dpc]

Without version = the binary will be /nix/store/0xdfyy5fsl4pisiqki0slc2ajr62jdfg-<name>-unknown/bin/<name> but nix run will try to execute /nix/store/0xdfyy5fsl4pisiqki0slc2ajr62jdfg-<name>-unknown/bin/<name>-unknown

[dpc]

Code examples (the fix: crev-dev/cargo-crev@3d24846)

[blitz]

This is interesting. It seems Nix automatically strips version numbers, but fails (understandably) for the "unknown" suffix. We can either:

• drop "-unknown" in the derivation names,
• set meta.programName to ${pname}.

[Sean1708]

Hmmm.... I'm running into a similar problem where instead of trying to run <name>-unknown it's trying to execute <name>-<version> but the binary is just called <name>. Setting version doesn't fix it, instead I have to strip the version manually in the exePath argument to mkApp.

[Sean1708]

In case a little more info is useful, my working flake.nix is

{

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

  outputs = { self, nixpkgs, utils, naersk }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };
        naersk-lib = pkgs.callPackage naersk { };
        nativeBuildInputs = with pkgs; [ gtk4 pkg-config ];
      in {
        defaultPackage = naersk-lib.buildPackage {
          root = ./.;

          inherit nativeBuildInputs;
        };

        defaultApp = let
          drv = self.defaultPackage."${system}";
          name = pkgs.lib.strings.removeSuffix ("-" + drv.version) drv.name;
        in utils.lib.mkApp {
          inherit drv;
          # TODO: https://github.com/nix-community/naersk/issues/224
          exePath = "/bin/${name}";
        };

        devShell = with pkgs;
          mkShell {
            buildInputs =
              [ cargo rust-analyzer rustc rustfmt rustPackages.clippy ];

            RUST_SRC_PATH = rustPlatform.rustLibSrc;

            inherit nativeBuildInputs;
          };
      });
}

[noebm]

I just stumbled upon this issue myself.
AFAICT modifying build.nix to use pname instead of specifying name manually should be enough and works for me with flake-utils.lib.mkApp.
This seems to be the preferred method anyway.