Lockfile generation hangs indefinitely when cache is corrupted

• I am on the latest Poetry version.

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

• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: macOS 11.6

• Poetry version: 1.1.13

• Python version: 3.9.13

Issue

poetry lock will hang indefinitely when trying to resolve a project with django-cors-headers as a dependency.

[tool.poetry]
name = "poetry-test"
version = "0.1.0"
description = ""
authors = []

[tool.poetry.dependencies]
python = "^3.9"
django-cors-headers = "^3.13.0"

[tool.poetry.dev-dependencies]

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

$ poetry lock -vvv
Using virtualenv: /Users/user/Library/Caches/pypoetry/virtualenvs/poetry-test-hz2NYSp8-py3.9
Updating dependencies
Resolving dependencies...
   1: fact: poetry-test is 0.1.0
   1: derived: poetry-test
   1: fact: poetry-test depends on django-cors-headers (^3.13.0)
   1: selecting poetry-test (0.1.0)
   1: derived: django-cors-headers (>=3.13.0,<4.0.0)

<sits frozen here forever>

I hunted this down after a larger project would never resolve dependencies (#2094), and narrowed it down to this single package.

[dimbleby]

it’s just a bunch of files, there’s no special magic. zip / tar them up. Minimal reproducer much preferred, ie if you can remove things that aren’t relevant then all the better.

hash mismatches are at least fairly clear, but hanging is not so good - if we can reproduce that then it would be worth poetry trying to cope better with whatever mess it has found.

[johnthagen]

@dimbleby Unfortunately I did not. I suspect that when Ctrl-C’ing Poetry during install/update/etc a file was saved in a partial, incomplete state.

The last time this happened to me, there was a hash mismatch. This time lock never progressed.

If this happens again, I will attempt to save the cache. Is it documented somewhere how to save the cache?