"expected string or bytes-like object" on poetry install

• 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: based on official docker image python:3.8-slim-buster (see below for Dockerfile)
• Poetry version: 1.1.4
• virtualenv version: 20.4.2
• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/wichert/ba05b0505c24ee7c71c5d7deb2ac2cfe

Issue

When I run poetry install in a private GitHub runner on an GHES installation I started getting an error (see further below for full output):

  TypeError

  expected string or bytes-like object

  at /usr/local/lib/python3.8/site-packages/poetry/core/utils/helpers.py:24 in canonicalize_name

Debug output

Creating virtualenv amp-portal in /__w/backend/backend/amp-portal/.venv
Using virtualenv: /__w/backend/backend/amp-portal/.venv

  Stack trace:

  11  /usr/local/lib/python3.8/site-packages/clikit/console_application.py:131 in run
       129│             parsed_args = resolved_command.args
       130│ 
     → 131│             status_code = command.handle(parsed_args, io)
       132│         except KeyboardInterrupt:
       133│             status_code = 1

  10  /usr/local/lib/python3.8/site-packages/clikit/api/command/command.py:120 in handle
       118│     def handle(self, args, io):  # type: (Args, IO) -> int
       119│         try:
     → 120│             status_code = self._do_handle(args, io)
       121│         except KeyboardInterrupt:
       122│             if io.is_debug():

   9  /usr/local/lib/python3.8/site-packages/clikit/api/command/command.py:163 in _do_handle
       161│         if self._dispatcher and self._dispatcher.has_listeners(PRE_HANDLE):
       162│             event = PreHandleEvent(args, io, self)
     → 163│             self._dispatcher.dispatch(PRE_HANDLE, event)
       164│ 
       165│             if event.is_handled():

   8  /usr/local/lib/python3.8/site-packages/clikit/api/event/event_dispatcher.py:22 in dispatch
        20│ 
        21│         if listeners:
     →  22│             self._do_dispatch(listeners, event_name, event)
        23│ 
        24│         return event

   7  /usr/local/lib/python3.8/site-packages/clikit/api/event/event_dispatcher.py:89 in _do_dispatch
        87│                 break
        88│ 
     →  89│             listener(event, event_name, self)
        90│ 
        91│     def _sort_listeners(self, event_name):  # type: (str) -> None

   6  /usr/local/lib/python3.8/site-packages/poetry/console/config/application_config.py:141 in set_installer
       139│ 
       140│         poetry = command.poetry
     → 141│         installer = Installer(
       142│             event.io,
       143│             command.env,

   5  /usr/local/lib/python3.8/site-packages/poetry/installation/installer.py:65 in __init__
        63│         self._installer = self._get_installer()
        64│         if installed is None:
     →  65│             installed = self._get_installed()
        66│ 
        67│         self._installed_repository = installed

   4  /usr/local/lib/python3.8/site-packages/poetry/installation/installer.py:561 in _get_installed
       559│ 
       560│     def _get_installed(self):  # type: () -> InstalledRepository
     → 561│         return InstalledRepository.load(self._env)
       562│ 

   3  /usr/local/lib/python3.8/site-packages/poetry/repositories/installed_repository.py:118 in load
       116│                 path = Path(str(distribution._path))
       117│                 version = distribution.metadata["version"]
     → 118│                 package = Package(name, version, version)
       119│                 package.description = distribution.metadata.get("summary", "")
       120│ 

   2  /usr/local/lib/python3.8/site-packages/poetry/core/packages/package.py:51 in __init__
        49│         Creates a new in memory package.
        50│         """
     →  51│         super(Package, self).__init__(
        52│             name,
        53│             source_type=source_type,

   1  /usr/local/lib/python3.8/site-packages/poetry/core/packages/specification.py:19 in __init__
        17│     ):  # type: (str, Optional[str], Optional[str], Optional[str], Optional[str], Optional[List[str]]) -> None
        18│         self._pretty_name = name
     →  19│         self._name = canonicalize_name(name)
        20│         self._source_type = source_type
        21│         self._source_url = source_url

  TypeError

  expected string or bytes-like object

  at /usr/local/lib/python3.8/site-packages/poetry/core/utils/helpers.py:24 in canonicalize_name
       20│ _canonicalize_regex = re.compile("[-_]+")
       21│ 
       22│ 
       23│ def canonicalize_name(name):  # type: (str) -> str
    →  24│     return _canonicalize_regex.sub("-", name).lower()
       25│ 
       26│ 
       27│ def module_name(name):  # type: (str) -> str
       28│     return canonicalize_name(name).replace(".", "_").replace("-", "_")

Dockerfile for base docker image

ARG DEBIAN_VERSION=buster
ARG PYTHON_VERSION=3.8
FROM python:${PYTHON_VERSION}-slim-${DEBIAN_VERSION}

ENV \
    DEBIAN_FRONTEND=noninteractive \
    PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    POETRY_VIRTUALENVS_IN_PROJECT=true \
    POETRY_NO_INTERACTION=1

RUN set -x \
    && apt-get update \
    && apt-get install -yq --no-install-recommends libpq-dev build-essential sudo \
    && rm -rf /var/lib/apt/lists/*

RUN pip install poetry==1.1.4

[dbalabka]

In my case poetry fails with a similar error when I’m trying to add a package:

poetry add "git+https://github.com/streamlit/streamlit.git#0.81.2.dev20210506"

[debonzi-geru]

I am not sure if it has anything to do with what you guys are experiencing but after get this problem localy in serveral projects and find this issue I started to debug poetry and found out that the issue was happening because, for some reason, I had a .egg-info directory. I could than see that poetry was checking on it for installed packages and there was a distribution object with no name in its metadata.

https://github.com/python-poetry/poetry/blob/977a72ca4614b6bb6e5ac885ec666e18c03c0a1d/poetry/repositories/installed_repository.py#L233

Reproducing the error: (I dont know how it would behave with a valid .egg-info directory)

# Working as expected
~/open-offertator$ poetry install
Installing dependencies from lock file

No dependencies to install or update

Installing the current project: open_offertator (0.1.0)

# Create a .egg-info directory
~/open-offertator$ mkdir open_offertator.egg-info/

# Try poetry again
~/open-offertator$ poetry install

  TypeError

  expected string or bytes-like object

  at ~/.pyenv/versions/3.9.4/lib/python3.9/site-packages/poetry/core/utils/helpers.py:27 in canonicalize_name
       23│ _canonicalize_regex = re.compile(r"[-_]+")
       24│ 
       25│ 
       26│ def canonicalize_name(name):  # type: (str) -> str
    →  27│     return _canonicalize_regex.sub("-", name).lower()
       28│ 
       29│ 
       30│ def module_name(name):  # type: (str) -> str
       31│     return canonicalize_name(name).replace(".", "_").replace("-", "_")

I hope it helps.