1.1.0b2 causes EnvCommandError (Non-posix paths with file:// protocol on Windows)

• 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: Windows 10
• Poetry version: 1.1.0b2
• Link of a Gist with the contents of your pyproject.toml file:

Issue

When on Poetry 1.0.10 there are no issues. But after having updated to poetry 1.1.0b2, I constantly get an EnvCommandError caused by a FileNotFoundError (a temporary setup.py file is not found):

$ poetry --version
Poetry version 1.1.0b2

$ poetry lock
Updating dependencies
Resolving dependencies...

Writing lock file

$ poetry install -vvv                                         
Using virtualenv: C:\Users\fredrik\code\repos\mylittleci\venv
Installing dependencies from lock file

Finding the necessary packages for the current system

Package operations: 2 installs, 0 updates, 0 removals

  • Installing zipp (3.1.0)

  Stack trace:

  7  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\installation\executor.py:183 in _execute_operation
      181│
      182│             try:
    → 183│                 result = self._do_execute_operation(operation)
      184│             except EnvCommandError as e:
      185│                 if e.e.returncode == -2:

  6  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\installation\executor.py:257 in _do_execute_operation
      255│             return 0
      256│
    → 257│         result = getattr(self, "_execute_{}".format(method))(operation)
      258│
      259│         if result != 0:

  5  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\installation\executor.py:394 in _execute_install
      392│
      393│     def _execute_install(self, operation):  # type: (Install) -> None
    → 394│         return self._install(operation)
      395│
      396│     def _execute_update(self, operation):  # type: (Update) -> None

  4  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\installation\executor.py:432 in _install
      430│             args.insert(2, "-U")
      431│
    → 432│         return self.run_pip(*args)
      433│
      434│     def _update(self, operation):

  3  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\installation\executor.py:283 in run_pip
      281│     def run_pip(self, *args, **kwargs):  # type: (...) -> int
      282│         try:
    → 283│             self._env.run_pip(*args, **kwargs)
      284│         except EnvCommandError as e:
      285│             output = decode(e.e.output)

  2  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\utils\env.py:883 in run_pip
       881│         pip = self.get_pip_command()
       882│         cmd = pip + list(args)
    →  883│         return self._run(cmd, **kwargs)
       884│
       885│     def _run(self, cmd, **kwargs):

  1  c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\utils\env.py:1151 in _run
      1149│             self.unset_env("__PYVENV_LAUNCHER__")
      1150│
    → 1151│             return super(VirtualEnv, self)._run(cmd, **kwargs)
      1152│
      1153│     def execute(self, bin, *args, **kwargs):

  EnvCommandError

  Command C:\Users\fredrik\code\repos\mylittleci\venv\Scripts\pip.exe install --no-deps file://C:\Users\fredrik\AppData\Local\pypoetry\Cache\artifacts\3f\29\e0\445941d0045028dce97085f4263281587225a49fa7dd09f41e4c2752af\zipp-3.1.0-py3-none-any.whl errored with the following return code 1, and output:
  Processing c:\users\fredrik\appdata\local\pypoetry\cache\artifacts\3f\29\e0\445941d0045028dce97085f4263281587225a49fa7dd09f41e4c2752af\zipp-3.1.0-py3-none-any.whl
      ERROR: Command errored out with exit status 1:
       command: 'c:\users\fredrik\code\repos\mylittleci\venv\scripts\python.exe' -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'C:\\Users\\fredrik\\AppData\\Local\\Temp\\pip-req-build-gsp4euj0\\setup.py'"'"'; __file__='"'"'C:\\Users\\fredrik\\AppData\\Local\\Temp\\pip-req-build-gsp4euj0\\setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base 'C:\Users\fredrik\AppData\Local\Temp\pip-pip-egg-info-_md_1odm'
           cwd: C:\Users\fredrik\AppData\Local\Temp\pip-req-build-gsp4euj0\
      Complete output (5 lines):
      Traceback (most recent call last):
        File "<string>", line 1, in <module>
        File "C:\Users\fredrik\AppData\Local\Programs\Python\Python37\lib\tokenize.py", line 447, in open
          buffer = _builtin_open(filename, 'rb')
      FileNotFoundError: [Errno 2] No such file or directory: 'C:\\Users\\fredrik\\AppData\\Local\\Temp\\pip-req-build-gsp4euj0\\setup.py'
      ----------------------------------------
  ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.


  at c:\users\fredrik\.local\pipx\venvs\poetry\lib\site-packages\poetry\utils\env.py:915 in _run
       911│                 output = subprocess.check_output(
       912│                     cmd, stderr=subprocess.STDOUT, **kwargs
       913│                 )
       914│         except CalledProcessError as e:
    →  915│             raise EnvCommandError(e, input=input_)
       916│
       917│         return decode(output)
       918│
       919│     def execute(self, bin, *args, **kwargs):

The contents of my pyproject.toml:

[tool.poetry]
name = "mylittleci"
version = "0.0.1"
authors = ["Fredrik <***@***.***>"]
description = "mylittleci"


[tool.poetry.dependencies]
python = "^3.7"


[tool.poetry.dev-dependencies]
importlib_metadata = "^1.7.0"


[tool.poetry.scripts]
calculator = "mylittleci.cli.calculator:main"


[build-system]
# https://python-poetry.org/docs/faq/#is-tox-supported
requires = ["poetry-core>=1.0.0a5"]
build-backend = "poetry.core.masonry.api"

[abn]

@fredrikaverpil freel free to submit a PR for the code you linked above by replacing str(archive) with archive.as_posix(), there is no need to use the windows check, let pathlib worry about that 😃

I’ll clean up the other bits later anyway.

[abn]

@fredrikaverpil thank you for the details you have provided. The issue here is the following piece of code.

https://github.com/python-poetry/poetry/blob/c77299ed373df50ec459907671f65f5da3de5070/poetry/installation/executor.py#L425

This is problematic because str() as this is not cross-platform safe. Looking into this, at the moment the type of archive is not necessarily guarenteed to be a Path instance either, this needs to be fixed and the above use of str(archive) needs to be replaced with archive.as_posix() instead.