ERROR: File "setup.py" not found for legacy project

[paw-lu]

Trying to install libsixel-python via Poetry results in a

% ❯ poetry add libsixel-python
Using version ^0.5.0 for libsixel-python

Updating dependencies
Resolving dependencies... (0.6s)

Package operations: 1 install, 0 updates, 0 removals

  • Installing libsixel-python (0.5.0): Failed

  EnvCommandError

  Command ['/Users/pawlu/Library/Caches/pypoetry/virtualenvs/nbpreview-fES2tmKb-py3.9/bin/pip', 'install', '--no-deps', 'file:///Users/pawlu/Library/Caches/pypoetry/artifacts/17/97/77/36c11dc77874fbb3ae7fb5d439eafb9b008ed60870b9fcd39ca0172297/libsixel-python-0.5.0.macosx-10.13-x86_64.tar.gz'] errored with the following return code 1, and output: 
  Processing /Users/pawlu/Library/Caches/pypoetry/artifacts/17/97/77/36c11dc77874fbb3ae7fb5d439eafb9b008ed60870b9fcd39ca0172297/libsixel-python-0.5.0.macosx-10.13-x86_64.tar.gz
  ERROR: File "setup.py" not found for legacy project file:///Users/pawlu/Library/Caches/pypoetry/artifacts/17/97/77/36c11dc77874fbb3ae7fb5d439eafb9b008ed60870b9fcd39ca0172297/libsixel-python-0.5.0.macosx-10.13-x86_64.tar.gz.

However, pip succeeds.

% python -m pip intstall libsixel-python

Both are using the same version of pip (21.1.3).

What's going on here? What does Poetry do differently that results in a failure?
How is this fixed?

[abn]

Looks like this was an issue with how the package archive was chosen. The package seems to have a dumb bdist attached which gets treated as an sdist by poetry. This seems to be resolved in master.

Using pipx

pipx install --suffix=@master 'poetry @ git+https://github.com/python-poetry/poetry.git@master'

Using a container (podman | docker)

podman run --rm -i --entrypoint bash python:3.8 <<EOF
set -xe
python -m pip install -q git+https://github.com/python-poetry/poetry.git@master
poetry new foobar
pushd foobar
poetry add libsixel-python
EOF

This should produce the output (with pipx install)

$ poetry@master add libsixel-python
Using version ^0.5.0 for libsixel-python

Updating dependencies
Resolving dependencies... (0.1s)

Writing lock file

Package operations: 1 install, 0 updates, 0 removals

  • Installing libsixel-python (0.5.0)
$

[paw-lu]

Thank you so much @abn for both the responce and work here!
It's really appreciated.