Mistyped package name causes infinite loop

[intgr]

• 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: Tested on macOS & Arch Linux
• Poetry version: 1.1.2
• Link of a Gist with the contents of your pyproject.toml file:

Issue

I converted my dependencies file using DepHell from Pipfile to requirements.txt to Poetry pyproject.toml. Trying to use this converted file, Poetry for some reason got stuck in an infinite loop. I tracked it down to one bad line.

The PyPI package has a name ruamel.yaml (with a dot), but my dependencies had it with a hyphen: ruamel-yaml

[tool.poetry.dependencies]
ruamel-yaml = "*"

Running poetry lock on such a file reproduces the infinite loop.

This may be partially causing #2094 ("Poetry is extremely slow when resolving the dependencies").

I cannot trigger this issue by using the Poetry command, however. If I write poetry add ruamel-yaml, it adds dependency with the correct name "ruamel.yaml" = "^0.16.12" and poetry lock works fine with that.

[abn]

Looks like there is a cyclic dependency involved here.

   1: selecting ruamel.yaml (0.16.12)
   1: fact: ruamel.yaml (0.16.12) depends on ruamel.yaml.clib (>=0.1.2)
   1: selecting ruamel.yaml (0.16.12)
   1: fact: ruamel.yaml (0.16.12) depends on ruamel.yaml.clib (>=0.1.2)

[intgr]

Note that if the dependency is added to pyproject.toml with a dot "ruamel.yaml" = "^0.16.12", it does not trigger the issue. It's somehow caused by the package name in pyproject.toml.

[abn]

@intgr noticed that. Appreciate the details in your issue report, it is extremely helpful.

[abn]

This seems to be the same as #3132.

[abn]

The issue was in how we normalised the name of the package. This needs a fix in core. And another change in poetry itself.