How to use uutils-coreutils instead of the builtin coreutils?

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I feel a little stupid now, instead of overriding the actual coreutils package, I could just make make build my own, and adding it in environment.systemPackages did the trick.

this would cause everything to be rebuild:

      nixpkgs = {
        # You can add overlays here
        overlays = [
          (final: prev: {
            coreutils = prev.coreutils.overrideAttrs (oldAttrs: rec {
              postInstall = ''
                mv $out/bin/rm $out/bin/rm.bak
                ln -s ${pkgs.unstable.rmtrash}/bin/rmtrash $out/bin/rm
              '';
            });
          })
        ];
      };

so instead, this worked:

      nixpkgs = {
        # You can add overlays here
        overlays = [
          (final: prev: {
            myCoreutils = prev.coreutils.overrideAttrs (oldAttrs: rec {
              postInstall = ''
                mv $out/bin/rm $out/bin/rm.bak
                ln -s ${pkgs.unstable.rmtrash}/bin/rmtrash $out/bin/rm
              '';
            });
          })
        ];
      };

      environment.systemPackages = with pkgs; [ 
        myCoreutils
      ];

But this is better, to just copy the output of coreutils and not need to rebuild it:

      nixpkgs = {
        # You can add overlays here
        overlays = [
          (final: prev: {
            myCoreutils = pkgs.symlinkJoin {
                name = "coreutils-wrapped";
                paths = [ pkgs.coreutils ];
                nativeBuildInputs = [ ];
                postBuild = ''
                  rm $out/bin/rm
                  ln -s ${pkgs.rmtrash}/bin/rmtrash $out/bin/rm
                '';
              };
            })
        ];
      };

      environment.systemPackages = with pkgs; [ 
        myCoreutils
      ];
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