In reply to @jyamad:cofree.coffee
I am trying to use poetry2nix via flakes, but I need to downgrade poetry due to https://github.com/python-poetry/poetry/issues/4523 . Does anyone have an example of a flake that overrides the poetry version that poetry2nix uses?

I have a Poetry flake I can get to reliably build a Nix derivation. I've been banging my head the last two days trying to build a container image from it with dockerTools.streamLayeredImage. The data.json file I use as my "database" can't be found by the Python processing script but only inside the container. Here's the error:

$ docker run docker run -p 5000:5000 --rm -it localhost/lbob:6xwsg8ixlbpaisq1xc7ipvs5qxcs3d1m
 * Serving Flask app 'little_bits_of_buddha.app' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on all addresses.
   WARNING: This is a development server. Do not use it in a production deployment.
 * Running on http://10.0.2.100:5000/ (Press CTRL+C to quit)
[2022-02-16 17:33:30,415] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
  File "/nix/store/wmaqg26cza9vvck1wglp3xywsqabnp7n-python3.9-flask-2.0.2/lib/python3.9/site-packages/flask/app.py", line 2073, in wsgi_app
    response = self.full_dispatch_request()
  File "/nix/store/wmaqg26cza9vvck1wglp3xywsqabnp7n-python3.9-flask-2.0.2/lib/python3.9/site-packages/flask/app.py", line 1518, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/nix/store/wmaqg26cza9vvck1wglp3xywsqabnp7n-python3.9-flask-2.0.2/lib/python3.9/site-packages/flask/app.py", line 1516, in full_dispatch_request
    rv = self.dispatch_request()
  File "/nix/store/wmaqg26cza9vvck1wglp3xywsqabnp7n-python3.9-flask-2.0.2/lib/python3.9/site-packages/flask/app.py", line 1502, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
  File "/nix/store/yr8hjra5czylkiz1pkcsclbbc7pqbyh2-python3.9-little-bits-of-buddha-0.1.0/lib/python3.9/site-packages/little_bits_of_buddha/app.py", line 10, in random_sutta
    return _random_sutta()
  File "/nix/store/yr8hjra5czylkiz1pkcsclbbc7pqbyh2-python3.9-little-bits-of-buddha-0.1.0/lib/python3.9/site-packages/little_bits_of_buddha/data.py", line 8, in _random_sutta
    with open("../data.json") as json_file:
FileNotFoundError: [Errno 2] No such file or directory: './data.json'

But the file is there:

ls /nix/store/yr8hjra5czylkiz1pkcsclbbc7pqbyh2-python3.9-little-bits-of-buddha-0.1.0/lib/python3.9/site-packages/little_bits_of_buddha/
__pycache__  app.py  data.json  data.py  run.py

Am I doing something wrong?

In reply to @k900:0upti.me
You need to actually declare that the file should be installed

This is what I thought! But poetry run lbob actually wants the source directory path. Here's what I wrote in this commit explaining the choice:

Poetry has odd behavior around relative file paths. Python scripts must
import starting from the project (`little_bits_of_buddha`) even if they
occupy the same directory. This commit fixes file paths to operate from
"project in".