尝试将NixOS非打包pytest-bdd添加到shell.nix环境中

Question

我想创建一个简单的python项目，并且nixos文档是helpul。

with import <nixpkgs> {};

(
  python3.withPackages (ps: [ps.ipython ps.flask ps.pytest])
).env

然后我在项目文件夹上运行nix-shell，一切看起来都很好。

我遇到的问题是，我想添加pytest-bdd，但是它似乎不是为NixOS打包的，因为nix搜索pytest-bdd不返回任何结果。

因此，我尝试使用pytest-bdd代替pytest-bdd，因为它已经为NixOS打包了，但不幸的是，行为二进制文件是不可用的，而ipython和烧瓶则是可用的。

因此，我决定尝试另一种用于pytest的方法-bdd，并且我遵循了https://nixos.org/nixpkgs/manual/#python上的示例(15.17.1.2.1 )。(包装图书馆)。

with import <nixpkgs> {};

(
  let
    my_pytestbdd = python37.pkgs.buildPythonPackage rec {
      pname = "pytest-bdd";
      version = "3.2.1";

      src = python37.pkgs.fetchPypi {
        inherit pname version;
        sha256 = "1ibyr40g3p6xbx1m59as3s9spyadz8wyc7zwqyzibphrw4pkvrqp";
      };

      doCheck = false;

      meta = {
        homepage = "https://github.com/pytest-dev/pytest-bdd/";
        description = "BDD library for the py.test runner";
      };
    };

  in python37.withPackages (ps: [ps.ipython ps.flask ps.pytest ps.glob2 my_pytestbdd])
).env

我被这条信息困住了：

Processing ./pytest_bdd-3.2.1-py2.py3-none-any.whl
Collecting glob2 (from pytest-bdd==3.2.1)
  ERROR: Could not find a version that satisfies the requirement glob2 (from pytest-bdd==3.2.1) (from versions: none)
ERROR: No matching distribution found for glob2 (from pytest-bdd==3.2.1)
builder for '/nix/store/d94madfidxgn5r0k9kivfidn4p2cvyjk-python3.7-pytest-bdd-3.2.1.drv' failed with exit code 1
cannot build derivation '/nix/store/ypc7hpylzvmxx8lmk5cfg8jfhrfalzgn-python3-3.7.5-env.drv': 1 dependencies couldn't be built
error: build of '/nix/store/ypc7hpylzvmxx8lmk5cfg8jfhrfalzgn-python3-3.7.5-env.drv' failed

Answer 1

解决方案

因此，在浏览了大量的文档之后，我成功地获得了一个工作解决方案，我希望与大家分享这个解决方案，以避免人们遭受与我相同的痛苦。

这是我的shell.nix文件：

with import <nixpkgs> {};

(
  let
    my_pytestbdd = python37.pkgs.buildPythonPackage rec {
      pname = "pytest-bdd";
      version = "3.2.1";

      src = python37.pkgs.fetchPypi {
        inherit pname version;
    sha256 = "1ibyr40g3p6xbx1m59as3s9spyadz8wyc7zwqyzibphrw4pkvrqp";
      };

      buildInputs = [ python37.pkgs.glob2 python37.pkgs.parse python37.pkgs.six 
python37.pkgs.py python37.pkgs.parse-type python37.pkgs.Mako python37.pkgs.pytest ];

      doCheck = false;

      meta = {
        homepage = "https://github.com/pytest-dev/pytest-bdd/";
        description = "BDD library for the py.test runner";
      };
    };

  in python37.withPackages (ps: [ps.ipython ps.flask ps.pytest my_pytestbdd])
).env

运行nix-shell成功地创建了环境。

Answer 2

如果您很高兴只使用requirements.txt文件，您可以使用虚拟主机弯曲nix以正常的方式工作，请参见下面的default.nix：

with import <nixpkgs> {};
with pkgs.python37Packages;

stdenv.mkDerivation {
  name = "impurePythonEnv1d";
  buildInputs = [
    taglib
    openssl
    git
    libxml2
    libzip
    python37Full
    python37Packages.virtualenv
    stdenv
    libffi
    zlib ];
  src = null;
  shellHook = ''
    unset http_proxy
    export GIT_SSL_CAINFO=/etc/ssl/certs/ca-bundle.crt
    SOURCE_DATE_EPOCH=$(date +%s)
    virtualenv --no-setuptools venv
    source venv/bin/activate
    pip install jedi
    pip install ipython==5.2.0
    pip install pylint
    pip install flake8
    pip install -r requirements.txt
  '';
}

然后创建一个requirements.txt并将其放到nix-shell上