JSONDecodeError

• 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 Mojave 10.14
• Poetry version: 0.12.9 pyproject.toml file:

λ cat pyproject.toml
[tool.poetry]
name = "pixiv2bg"
version = "1.0.0"
description = "Pixiv pictures to background."
authors = ["Nasy"]
license = "MIT"

[tool.poetry.dependencies]
uvloop = "^0.11.1"
aiohttp = "^3.3"
tqdm = "^4.24"
ujson = "^1.35"

[tool.black]
line-length = 79

Issue

Well, when doing poetry install, an exception happened. I also have tried to remove the pyproject.toml and poetry init again, but it still failed like the result shown below.

The project is here: https://github.com/nasyxx/pixiv2bg . Simply clone it down and poetry install, the exception will raise.

Here is the result:

λ poetry install -vvv                  
[JSONDecodeError]             
Expecting value: line 1 column 1 (char 0)  
                                             
Exception trace:
 /usr/local/lib/python3.7/site-packages/cleo/application.py in run() at line 94
   status_code = self.do_run(input_, output_)
 /usr/local/lib/python3.7/site-packages/poetry/console/application.py in do_run() at line 88
   return super(Application, self).do_run(i, o)
 /usr/local/lib/python3.7/site-packages/cleo/application.py in do_run() at line 197
   status_code = command.run(input_, output_)
 /usr/local/lib/python3.7/site-packages/poetry/console/commands/command.py in run() at line 77
   return super(BaseCommand, self).run(i, o)
 /usr/local/lib/python3.7/site-packages/cleo/commands/base_command.py in run() at line 136
   self.initialize(input_, output_)
 /usr/local/lib/python3.7/site-packages/poetry/console/commands/env_command.py in initialize() at line 21
   ".".join(str(v) for v in current_env.version_info[:3])
 /usr/local/lib/python3.7/site-packages/poetry/utils/env.py in version_info() at line 128
   return tuple(self.marker_env["version_info"])
 /usr/local/lib/python3.7/site-packages/poetry/utils/env.py in marker_env() at line 144
   self._marker_env = self.get_marker_env()
 /usr/local/lib/python3.7/site-packages/poetry/utils/env.py in get_marker_env() at line 466
   return json.loads(output)
 /usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/__init__.py in loads() at line 348
   return _default_decoder.decode(s)
 /usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py in decode() at line 337
   obj, end = self.raw_decode(s, idx=_w(s, 0).end())
 /usr/local/Cellar/python/3.7.1/Frameworks/Python.framework/Versions/3.7/lib/python3.7/json/decoder.py in raw_decode() at line 355
   raise JSONDecodeError("Expecting value", s, err.value) from None

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

[laoshaw]

this occurs with 3.10-rc2 on ubuntu 20.04

[Imaclean74]

for me at least https://github.com/sdispater/poetry/issues/779 seems to be the root cause. EnvBuilder create fails to copy files for some reason and leaves a partially created and nonfunctional venv. How it fails I’m not clear on yet. However at least on my system I have a consistent repro by doing this ( code modeled on utils/env.py )

tmpdir = tempfile.mkdtemp()
path = pathlib.Path( tmpdir ) / "test"
print(f"creating temp dir in {path}")
builder = EnvBuilder(with_pip=True)
builder.create(path)

which gives this error

 output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/usr/tmp/tmp2lefjc9x/testp/bin/python', '-Im', 'ensurepip', '--upgrade', '--default-pip']' died with <Signals.SIGABRT: 6>.

but it works if I flip the mode to use symlinks

builder = EnvBuilder(with_pip=True, symlinks=True)

and that also works after patching env.py in poetry.

note - that you only see this error on the first command that triggers venv creation. Subsequent commands will call get_marker_env() that shells out to the python in the broken venv and gets an error string instead of a valid json block - triggering the JSONDecodeError error above.