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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Flakes aren't real and cannot hurt you: a guide to using Nix flakes the non-flake way (jade.fyi)

submitted 8 months ago by [email protected] to c/[email protected]

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[–] [email protected] 2 points 8 months ago (1 children)

I dunno, I don’t trust a guides still recommending flake-utils. You can make the same four loop in like 4 lines of Nix which is a smaller diff & doesn’t pollute your downstream consumers with a useless dependency. Flakes also don’t eliminate pointless builds, fileset or filtering the src can & the only tool with file tracking on by default is the Git VCS specifically (which also involves the intent to add flags which is the other side of annoying).

[–] [email protected] 1 points 8 months ago (1 children)

I sometimes write a flake with those 4 lines of Nix code, and it comes out just messy enough that tbh I'm happier adding an input to handle that. But I recently learned that the nixpkgs flake exports the lib.* helpers through nixpkgs.lib (as opposed to nixpkgs.legacyPackages.${system}.lib) so you can call helpers before specifying a system. And nixpkgs.lib.genAttrs is kinda close enough to flake-utils.lib.eachSystem that it might make a better solution.

Like where with flake-utils you would write,

flake-utils.lib.eachSystem [ "x86_64-linux" "aarch64-darwin" ] (system:
let
  pkgs = nixpkgs.legacyPackages.${system};
in
{
  devShells.default = pkgs.mkShell {
    nativeBuildInputs = with pkgs; [
      hello
    ];
  };
})

Instead you can use genAttrs,

let
  forAllSystems = nixpkgs.lib.genAttrs [ "x86_64-linux" "aarch64-darwin" ];
  pkgs = forAllSystems (system:
    nixpkgs.legacyPackages.${system}
  );
in
{
  devShells = forAllSystems (system: {
    default = pkgs.${system}.mkShell {
      nativeBuildInputs = with pkgs.${system}; [
        hello
      ];
    };
  });
}

It's more verbose, but it makes the structure of outputs more transparent.

[–] [email protected] 2 points 8 months ago

Saving the dependency is pretty big since each flake you import will bring along its jungle of dependencies now in your downstream project. I can’t think of a use case where < 10 lines is worth a dependency—especially since as you noted, lib has the glue right there for you to put it all together.