Using python3.13 and cachix taking too long in compiling

[emdneto]

{ pkgs, ... }: {
  cachix.enable = true;
  languages.python = {
    enable = true;
    version = "3.13";
    venv.enable = true;
    uv.enable = true;
  };

  services.nginx = {
    enable = true;
    httpConfig = ''
      server {
        listen 8080;
        location / {
          return 200 "Hello, world!";
        }
      }
    '';
  };
  enterShell = ''
    echo "Hello, world! Shell"
  '';
  enterTest = ''
    wait_for_port 8080
    curl -s localhost:8080 | grep "Hello, world!"
  '';
}

inputs:
  nixpkgs:
    url: github:cachix/devenv-nixpkgs/rolling
  nixpkgs-python:
    url: github:cachix/nixpkgs-python

Every time I run the devenv shell, it compiles the python, taking too long to initialize the shell. How can I avoid that? Already added cachix use nixpkgs-python

✔ Building shell in 354.6s.
• Entering shell

[domenkozar]

You're using a custom set of nixpkgs, that's why you have to compile Python. If you want to use a binary cache, don't disable Cachix :)

[emdneto]

You're using a custom set of nixpkgs, that's why you have to compile Python. If you want to use a binary cache, don't disable Cachix :)

should I remove this from devenv.yaml, then?

  nixpkgs:
    url: github:cachix/devenv-nixpkgs/rolling

edit: I think it's working now. thanks

[emdneto]

@domenkozar sorry, reopening:

It seems not to work on CI when running: devenv ci

| • Overriding .devenv to .devenv.V19GpkgCbeqg
| • Building tests ...
| • Using Cachix: nixpkgs-python
| • Trusting nixpkgs-python.cachix.org on first use with the public key nixpkgs-python.cachix.org-1:hxjI7pFxTyuTHn2NkvWCrAUcNZLNS3ZAvfYNuYifcEU=
| these 5 derivations will be built:
|   /nix/store/nmb7qxwiy3z3xdw58qka9gff43zhd058-python3-3.13.1.drv
|   /nix/store/ryf981zc9kshrrgm5c5dphnw879gn09m-builder.pl.drv
|   /nix/store/jppcl4bxay1dm31prrsz35cw9my9qxwb-python3-3.13.1-env.drv
|   /nix/store/9qyk9cbicqdiwhc5m1cphgyc1f9xgcrm-devenv-profile.drv
|   /nix/store/qhplaypcsby5nxran9a853v12kg2crfd-devenv-test.drv
| these 106 paths will be fetched (189.55 MiB download, 664.40 MiB unpacked):
|   /nix/store/vb32gyii76kzzgn9f1lz85kyrx8qw9pp-Python-3.13.1.tgz
|   /nix/store/nrl5m466dwdscvavf1nqzdnqhszjyy9n-acl-2.3.2
|   /nix/store/nmq6s9l9zlym3qjx76zzrqbp05a63y90-attr-2.5.2
|   /nix/store/zwva6ar5cd1v1wvsilxj2bc70yld4dw2-autoconf-2.72

I'm not sure what I'm doing wrong because my file is pretty simple, and everytime I run devenv ci in my CI it compiles python again

[emdneto]

Solved with:

languages.python = {
    enable = true;
    package = nixpkgs-unstable.python313;
    venv.enable = true;
    uv.enable = true;
    uv.package = nixpkgs-unstable.uv;
  };