How to install pip library in idx from requirements.txt

Project Templates
1

i try to make a Django app, when i try to install a library via pip, its show error:


× This environment is externally managed
╰─> This command has been disabled as it tries to modify the immutable
    `/nix/store` filesystem.
    
    To use Python with Nix and nixpkgs, have a look at the online documentation:
    <https://nixos.org/manual/nixpkgs/stable/#python>.
2

Does you project have a python virtual env configured??

If not then configure a virtual env then activate the env and run the pip install command

If it already has a virtual env then activate the env and run the pip install command

3

Can you provide dev.nix file for Django Project. I am using custom dev.nix file but I don’t know how to make changes in dev.nix file. I also tried to read documentation but still not able to run comment to activate virtual environment on onStart.

4

Out of curiosity, which template did you use? Looks like you’re not in a virtual environment. Can you create one and then try to install?

python -m venv .venv
source .venv/bin/activate
pip install django
5

you are right, i adjust file and error is gone. but i have another error while preview.
edit: i open project again and this error also fixed. but in terminal:

apitest-3xxxx39:~/api$ /nix/store/4cb33zcc0i7wrnmwwfp9q4y2p4fas9gd-active-venv
source /home/user/api/.venv/bin/activate
ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'requirements.txt'
apitest-3xxxx39:~/api$ source /home/user/api/.venv/bin/activate
(.venv) apitest-3xxxx39:~/api$

dev.nix:

{ pkgs, ... }: {
  channel = "stable-24.05";
  packages = [
    pkgs.python3
    pkgs.git
    pkgs.zsh
  ];
  env = {};
    idx.extensions = [
      "ms-python.python"
      "dbaeumer.vscode-eslint"
      "esbenp.prettier-vscode"
    ];
    idx.workspace = {
      onCreate = {
        create-venv = ''
          python -m venv .venv
          source .venv/bin/activate
          pip install -r mysite/requirements.txt
        '';
        default.openFiles = ["mysite/requirements.txt" "mysite/mysite/urls.py"];
      };
      onStart = {
        active-venv = ''
        source .venv/bin/activate
        pip install -r requirements.txt
        '';
      };
    };
    idx.previews = {
      enable = true;
      previews = {
        web = {
          command = ["./devserver.sh"];
          env = {
            PORT = "$PORT";
          };
          manager = "web";
        };
      };
    };
  services.postgres = {
    enable = true;
    extensions = ["pgvector"];
  };
  services.redis = {
    enable = true;
    port = 5535;
  };
}

and devserver.sh:

#!/bin/sh
source .venv/bin/activate
python mysite/manage.py runserver $PORT
6

sorry was busy with something else:

You can checkout this repo that for a fastapi and try doing something similar: fastapi-idx/dev.nix at main · srivats22/fastapi-idx · GitHub