cannot use .pkgs of pythons provided here

[pedohorse]

I'm not sure if using .pkgs.something is intended with these pythons, but i'm surely getting a strange error:

error: builder for '/nix/store/jwc3cbbp74lc3krq8ilkhgd7izg8bdxd-Python-3.8.17.tar.xz.drv' failed with exit code 1;
       last 10 log lines:
       >   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
       >                                  Dload  Upload   Total   Spent    Left  Speed
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: www.python.org
       > Warning: Problem : timeout. Will retry in 1 seconds. 3 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: www.python.org
       > Warning: Problem : timeout. Will retry in 2 seconds. 2 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: www.python.org
       > Warning: Problem : timeout. Will retry in 4 seconds. 1 retries left.
       >   0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0curl: (6) Could not resolve host: www.python.org
       > error: cannot download Python-3.8.17.tar.xz from any mirror
       For full logs, run 'nix log /nix/store/jwc3cbbp74lc3krq8ilkhgd7izg8bdxd-Python-3.8.17.tar.xz.drv'.
error: 1 dependencies of derivation '/nix/store/idxlik38iac33hicidlf7qhjc4nn494m-python3-3.8.17.drv' failed to build
error: 1 dependencies of derivation '/nix/store/ppgrg13rqs00lsh6mphrhx9nlknq770m-wrap-python-hook.drv' failed to build
error: 1 dependencies of derivation '/nix/store/2lpg8ysd173ifdrbmsd26lrxnkkyqdhj-nix-shell-env.drv' failed to build

to reproduce - just add python.pkgs.wrapPython to buildInputs of a shell (or any derivation), for example:

{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs";
    nixpython = {
      url = "github:cachix/nixpkgs-python";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };
  outputs = { self, nixpkgs, nixpython }:
  let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;
    python = nixpython.packages.x86_64-linux."3.8";
  in {
    packages.x86_64-linux = rec {
      py = python;
      test_python = pkgs.mkShell {
        buildInputs = [
          python.pkgs.wrapPython
        ];
      };
    };
  };
}

and do nix build .#test_python while nix build .#py works fine and builds python from source or removing .pkgs.wrapPython and leaving just python in buildInputs works fine too

I'm relatively new to the whole nix thing, so I have no idea if I'm doing something wrong

It does seem that for some reason it tries to build python38 again, even if i have just built it separately... and it has no network while trying to fetch sources, as if it was called from within build sandbox, but how is this possible??

P.S. my network is fine, i can access the url it tries to fetch, and i can build python38 from this repository from source without any issues

[mcdonc]

FTR, this also happens when using one inside environment.systemPackages:

environment.systemPackages = with pkgs; [
  pkgs.allthepythons.packages.x86_64-linux."3.9.16"
....

Where "allthepythons" is an overlay within a flake:

overlay-nixpkgs-python = final: prev: {
    allthepythons = import nixpkgs-python;
  };

[domenkozar]

For some reason it uses .xz in the url, while it should be https://www.python.org/ftp/python/3.8.18/Python-3.8.18.tgz.

This means something is wrong how overrides are applied, it's not passing the correct hash and the url.

[domenkozar]

Should be fixed on main, can you try?

[domenkozar]

It works now.