Support nested requirements.txt for Python?

[sheeeng]

If the requirements-development.txt include a nested link to requirements.txt, it fails.

How can we support nested requirements.txt for Python?

0002.18: Requirements changed, running pip install -r /nix/store/l1a8wwdq2c6v05cr0f8bibnjj92fgqas-requirements.txt...
--- devenv:python:virtualenv stderr:
0000.02: ERROR: Could not open requirements file: [Errno 2] No such file or directory: '/nix/store/requirements.txt'

  # https://github.com/cachix/devenv/blob/741e23a22f3dc9e53075be3eaa795ea9ed6f5129/examples/python/devenv.nix
  languages.python = {
    enable = true;
    venv.enable = true;
    venv.requirements = ./requirements-development.txt;
  };

# requirements-development.txt
--requirement=requirements.txt
codespell==2.3.0
symspellpy==6.7.8
vale==3.9.1.0

# requirements.txt
mkdocs==1.6.1
pygments==2.18.0
pymdown-extensions==10.12

See https://devenv.sh/community/get-involved/ for how to contact the community.

Feel free to also post a question here.

[clotodex]

Do you need them to be referenced by each other?
If not you could combine them in devenv instead

[sheeeng]

Do you need them to be referenced by each other? If not you could combine them in devenv instead

Preferably referenced by another file. What do you mean by combine them in devenv?

[dz0ny]

try with

  languages.python = {
    enable = true;
    venv.enable = true;
    venv.requirements = ${./.}/requirements-development.txt;
  };

or

  languages.python = {
    enable = true;
    venv.enable = true;
    venv.requirements = ${config.env.DEVENV_ROOT} + "/requirements-development.txt";
  };

The idea is to inject absolute path not relative one.

[sheeeng]

Thanks for the tip, @dz0ny.

However, it does not work as expected. Somehow, it refuses to accept the other --requirement=requirements.txt.

venv.requirements = "${./.}/requirements-development.txt";

--- devenv:python:virtualenv failed with error: Task exited with status: exit status: 1
--- devenv:python:virtualenv stdout:
0002.52: Requirements changed, running pip install -r /nix/store/gcrrm2121zwh623rh7k6lnh0ka923yac-requirements.txt...
--- devenv:python:virtualenv stderr:
0000.03: ERROR: Invalid requirement: '/nix/store/1w3xhq2aj1qp440v3bw7syimzysmrj1y-l55kkpj1biwidsdvqs71fvs4dg5zk156-source/requirements-development.txt': Expected package name at the start of dependency specifier
0000.03:     /nix/store/1w3xhq2aj1qp440v3bw7syimzysmrj1y-l55kkpj1biwidsdvqs71fvs4dg5zk156-source/requirements-development.txt
0000.03:     ^ (from line 1 of /nix/store/gcrrm2121zwh623rh7k6lnh0ka923yac-requirements.txt)
0000.03: Hint: It looks like a path. The path does exist. 

venv.requirements = "${config.env.DEVENV_ROOT}/requirements-development.txt";

--- devenv:python:virtualenv failed with error: Task exited with status: exit status: 1
--- devenv:python:virtualenv stdout:
0003.47: Requirements changed, running pip install -r /nix/store/r2m99br9mqf9ghyrbd851gggc52dxv6d-requirements.txt...
--- devenv:python:virtualenv stderr:
0000.03: ERROR: Invalid requirement: '/Users/USERNAME/.config/home-manager/requirements-development.txt': Expected package name at the start of dependency specifier
0000.03:     /Users/USERNAME/.config/home-manager/requirements-development.txt
0000.03:     ^ (from line 1 of /nix/store/r2m99br9mqf9ghyrbd851gggc52dxv6d-requirements.txt)
0000.03: Hint: It looks like a path. The path does exist. 

[sheeeng]

Using the main requirements.txt that is not referring to other files show errors too.

venv.requirements = "${./.}/requirements.txt";

0002.90: Requirements changed, running pip install -r /nix/store/86d7azxy1klg5fsmcxcaggn72k9kh1h6-requirements.txt...
--- devenv:python:virtualenv stderr:
0000.02: ERROR: Invalid requirement: '/nix/store/mmgh0vqz395b2wh4qdn1b7g73rq8lzhg-gy5mkq17rrcs934qnxxgsbzyrhfdbl1z-source/requirements.txt': Expected package name at the start of dependency specifier
0000.02:     /nix/store/mmgh0vqz395b2wh4qdn1b7g73rq8lzhg-gy5mkq17rrcs934qnxxgsbzyrhfdbl1z-source/requirements.txt
0000.02:     ^ (from line 1 of /nix/store/86d7azxy1klg5fsmcxcaggn72k9kh1h6-requirements.txt)
0000.02: Hint: It looks like a path. The path does exist. The argument you provided (/nix/store/mmgh0vqz395b2wh4qdn1b7g73rq8lzhg-gy5mkq17rrcs934qnxxgsbzyrhfdbl1z-source/requirements.txt) appears to be a requirements file. If that is the case, use the '-r' flag to install the packages specified within it.
---

[dz0ny]

(builtins.readFile ./requirements.txt) + "\n" + (builtins.readFile ./requirements-development.txt); Would also be a way to do it but you would need to remove the "nested" include. Maybe with this helper readFileWithoutFirstLine = file: builtins.substring (builtins.stringLength (builtins.readFile file) - 1) 1 (builtins.readFile file);

[sheeeng]

(builtins.readFile ./requirements.txt) + "\n" + (builtins.readFile ./requirements-development.txt); Would also be a way to do it but you would need to remove the "nested" include. Maybe with this helper readFileWithoutFirstLine = file: builtins.substring (builtins.stringLength (builtins.readFile file) - 1) 1 (builtins.readFile file);

These help! Thanks, @dz0ny!

[domenkozar]

There's also #981