Poetry can't add any package anymore in a reasonable amount of time

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Issue

Here’s my env:

• macOS Big Sur
• pyenv (Python 3.10)
• Poetry version 1.1.12 (installed with pipx)
• My config

$ poetry config --list
cache-dir = "/myPath"
experimental.new-installer = true
installer.parallel = true
virtualenvs.create = true
virtualenvs.in-project = true
virtualenvs.path = "{cache-dir}/virtualenvs"  # /myPath/virtualenvs

I have worked with poetry smoothly so far. Suddenly, it looks like poetry can’t resolve dependencies anymore in a reasonable amount of time. It happens, for example, with pytest. This is my starting pyproject.toml

click to expand my pyproject.toml

[tool.poetry]
name = "foo"
version = "0.1.0"
description = ""
authors = ["Foo <[e-mail]>"]

# ciao
[tool.poetry.dependencies]
python = "^3.9"

[tool.poetry.dev-dependencies]

[build-system]
requires = ["poetry-core>=1.0.0"]
build-backend = "poetry.core.masonry.api"

if I run $ poetry add pytest --dev -vvv

I get this output (ie: poetry stuck in Resolving dependencies… )

click to expand command output

Using virtualenv: /projectPath/foo/.venv
PyPI: 147 packages found for pytest *
Using version ^6.2.5 for pytest

Updating dependencies
Resolving dependencies...
   1: fact: foo is 0.1.0
   1: derived: foo
   1: fact: foo depends on pytest (^6.2.5)
   1: fact: foo depends on pytest (^6.2.5)
   1: selecting foo (0.1.0)
   1: derived: pytest (>=6.2.5,<7.0.0)
PyPI: 1 packages found for pytest >=6.2.5,<7.0.0
   1: fact: pytest (6.2.5) depends on attrs (>=19.2.0)
   1: fact: pytest (6.2.5) depends on iniconfig (*)
   1: fact: pytest (6.2.5) depends on packaging (*)
   1: fact: pytest (6.2.5) depends on pluggy (>=0.12,<2.0)
   1: fact: pytest (6.2.5) depends on py (>=1.8.2)
   1: fact: pytest (6.2.5) depends on toml (*)
   1: fact: pytest (6.2.5) depends on atomicwrites (>=1.0)
   1: fact: pytest (6.2.5) depends on colorama (*)
   1: selecting pytest (6.2.5)
   1: derived: colorama
   1: derived: atomicwrites (>=1.0)
   1: derived: toml
   1: derived: py (>=1.8.2)
   1: derived: pluggy (>=0.12,<2.0)
   1: derived: packaging
   1: derived: iniconfig
   1: derived: attrs (>=19.2.0)
PyPI: 42 packages found for colorama *
^C   1: Version solving took 93.503 seconds.
   1: Tried 1 solutions.

As you can see, I stopped the process after 96s. I can’t understand what is going on and why it suddenly started taking so long for installing just pytest. How can I fix it up?

PS: this issue started after installing ruamel.yaml with poetry. I’m quite sure it was just a coincidence. But that is what happened.

PPS: the issue persists also after clearing cache with $ poetry cache clear --all pypi

[floatingpurr]

Edit: Looks like I can’t even start a new project from scratch

$ poetry new foo
$ cd foo
foo$ poetry install
Creating virtualenv foo in /mypath/foo/.venv
Updating dependencies
Resolving dependencies... (210.8s) 

…still hanging

[floatingpurr]

See also https://github.com/python-poetry/poetry/issues/2094#issuecomment-1106447343 as a possible solution