virtualenvs.create false and .venv poetry install not working

• I am on the [latest](https://github.com/sdispater/poetry/rpoetry config settings.virtualenvs.in-project trueeleases/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).

• Debian9-Strech:

• 0.12.10:

• Brand new pyproject after poetry new

Issue

Hello, I develop a new project with poetry, the option : settings.virtualenvs.in-project true is activated Then I COPY the folder in a docker to build it, I use then the option : virtualenvs.create false poetry install -vvv wont build it with this error :

[JSONDecodeError]             
Expecting value: line 1 column 1 (char 0)  
                                             
Exception trace:
 /root/.poetry/lib/poetry/_vendor/py3.5/cleo/application.py in run() at line 94
   status_code = self.do_run(input_, output_)
 /root/.poetry/lib/poetry/console/application.py in do_run() at line 88
   return super(Application, self).do_run(i, o)
 /root/.poetry/lib/poetry/_vendor/py3.5/cleo/application.py in do_run() at line 197
   status_code = command.run(input_, output_)
 /root/.poetry/lib/poetry/console/commands/command.py in run() at line 77
   return super(BaseCommand, self).run(i, o)
 /root/.poetry/lib/poetry/_vendor/py3.5/cleo/commands/base_command.py in run() at line 136
   self.initialize(input_, output_)
 /root/.poetry/lib/poetry/console/commands/env_command.py in initialize() at line 21
   ".".join(str(v) for v in current_env.version_info[:3])
 /root/.poetry/lib/poetry/utils/env.py in version_info() at line 128
   return tuple(self.marker_env["version_info"])
 /root/.poetry/lib/poetry/utils/env.py in marker_env() at line 144
   self._marker_env = self.get_marker_env()
 /root/.poetry/lib/poetry/utils/env.py in get_marker_env() at line 457
   return json.loads(output)
 /usr/lib/python3.5/json/__init__.py in loads() at line 319
   return _default_decoder.decode(s)
 /usr/lib/python3.5/json/decoder.py in decode() at line 339
   obj, end = self.raw_decode(s, idx=_w(s, 0).end())
 /usr/lib/python3.5/json/decoder.py in raw_decode() at line 357
   raise JSONDecodeError("Expecting value", s, err.value) from None

install [--no-dev] [--dry-run] [-E|--extras EXTRAS] [--develop DEVELOP]

If I remove the .venv it works again.

Thanks for your project. It’s very helpful 😃

[chdsbd]

I ran into this issue too, but I was running with settings.virtualenvs.in-project = false.

The fix is the same, but I needed to delete the virtual environment in settings.virtualenvs.path

[abn]

@chdsbd I do not think mounting host virtual environments into a container environment is a reliable scenario.

I would recommend you cache the virtual environment in the container instead.

Add this to your .dockerignore file (assuming you use in-project on your host).

.venv
dist/

FROM python:3.8

RUN pip install poetry
RUN poetry config virtualenvs.-
RUN install -d /opt/src

WORKDIR /opt/src

COPY poetry.lock pyproject.toml /opt/src

RUN poetry install  --no-dev --no-root

COPY . /opt/src

RUN poetry install

ENTRYPOINT ["poetry", "run"]

CMD "bash"