Nix Flake 获得特定的 python 版本

Question

我正在尝试制作一个 Nix 薄片，它将使用 poetry2nix 来构建一个诗歌项目代码是

{
 description = "searx : flake";

  inputs.nixpkgs.url = github:NixOS/nixpkgs/nixos-20.03;

  outputs = { self, nixpkgs }: {

    defaultPackage.x86_64-linux =
      with import nixpkgs { system = "x86_64-linux";
      buildInputs = [
      nixpkgs.python39
      nixpkgs.git
      nixpkgs.openssl
      nixpkgs.python39Packages.pip
      nixpkgs.uwsgi
      nixpkgs.python39Packages.virtualenv
      nixpkgs.poetry
     ];
 };


pkgs.poetry2nix.mkPoetryApplication {
  projectDir = ./.;
      src = pkgs.fetchgit {
        url = "https://github.com/searx/searx.git";
        rev = "ae122ea943f77600fd97556503c483dcd92e1e63";
        sha256 = "sIJ+QXwUdsRIpg6ffUS3ItQvrFy0kmtI8whaiR7qEz4=";
      };


};
  };

但是 Nix 薄片开始拉动 python3.7 并因以下错误而断裂

ERROR: Could not find a version that satisfies the requirement importlib-metadata; python_version < "3.8" (from click==8.0.1) (from versions: none)
       > ERROR: No matching distribution found for importlib-metadata; python_version < "3.8" (from click==8.0.1)

等同于 default.nix 拉取 python 3.9 并成功构建。我相信如果可以将 flake 固定到 python3.9，它将能够构建它。这可能吗？

Answer 1

你可以再传一个python to mkPoetryApplication.

pkgs.poetry2nix.mkPoetryApplication {
  projectDir = ./.;
  python = pkgs.python39;
  # ... your code ...
}

Nix Flake 获得特定的 python 版本

Nix Flake get a specific python version

nix