Flake for Python environment using micromamba

[mortal]

This is a thread for following up on my question asked in:

Nix Shell with Micromamba and FHS

Hi I’m having the same issue. I also use fish as shell and set up dash as a replacement for bash according to the wiki. Since I’m quite new to Nix I’m having trouble setting up an environment using a flake. My flake looks like this: { description = “Flake to set up python environment with micromamba”; inputs = { nixpkgs.url = “github:NixOS/nixpkgs/nixos-unstable”; }; outputs = { self, nixpkgs, … }: let system = “x86_64-linux”; pkgs = import nixpkgs { inherit system; }; f…

Hi @NobbZ thanks for the quick reply.
I used builtins.getEnv since it’s written in the Python wiki for setting up micromamba (the complete flake is basically the shell.nix from the wiki (Python - NixOS Wiki) just written as a flake).

So I would also have to change builtins.getEnv and if so with what should I replace it? I have only found some posts mentioning using it with --impure.

If I follow your suggestion to use

in {
  devShells.x86_64-linux.default = fhs.env;
};

and then execute nix-shell python-flake.nix it gives me:

error: nix-shell requires a single derivation

Is this related to builtins.getEnv ?

As mentioned in my previous post I’m new to NixOS so please bear with me.

[NobbZ]

As you are creating a flake you would use nix develop with that.

The builtins.getEnv wouldn’t have any effect in the last version of the flake I have seen, as that was dead code.

[mortal]

Thank you so much, it works now!