Combining the best of both worlds: nixStable/nixUnstable hybrid

Atemu · June 22, 2021, 7:50pm

nix-* from nixUnstable with new error messages etc.
nixUnstable’s nix command as nixUnstable and nixFlakes
nix from nixStable
Working bash-completions for everything; works with nix-bash-completions just like nixStable

Enjoy

Atemu/nixos-config/blob/dbdea34e1b1d12828ad644505a4e3da48a2b9771/nix.nix

{ stdenv, nixStable, nixUnstable, lib }:

stdenv.mkDerivation {
  inherit (nixUnstable) pname version;
  src = nixUnstable;
  installPhase = ''
    # Symlink-copy of nixUnstable
    cp -as $src $out
    chmod -R +rw $out

    cd $out/bin
    mv nix nixUnstable
    ln -s nixUnstable nixFlakes

    # All nix-* commands need to point at nixUnstable now (it's a multi-call binary)
    for cmd in nix-* ; do ln -sf nixUnstable "$cmd" ; done

    # Provide old nix as nixStable
    ln -s ${nixStable}/bin/nix nixStable
    # nix needs to be the old one for nix-bash-completions (and my muscle memory) to work

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Can simply be callPackage'd; like this for example:

github.com

Atemu/nixos-config/blob/dbdea34e1b1d12828ad644505a4e3da48a2b9771/overlays.nix#L4-L6

    
      
          nixpkgs.overlays = [
            (final: prev: {
              nix = final.callPackage ./nix.nix { };