Breaks when noxfile is not in normal location

[SwampFalc]

I have just moved my noxfile from my project root into my "tests" folder, and so I now call nox providing the full path to the noxfile (--noxfile <path>).

However, as the nox documentation indicates at https://nox.thea.codes/en/stable/config.html#nox.sessions.Session.invoked_from, if the given noxfile is in a different folder, then nox will cwd into that folder. This will then break the relative path used in _PoetrySession.export_requirements:

lockdata = Path("poetry.lock").read_bytes()

Now, looking at the code some more, this seems like it's just the first error I encounter using my noxfile, I would assume that all of _PoetrySession.poetry is going to be broken since Poetry.config also assumes a correct cwd:

@property
def config(self) -> Config:
    """Return the package configuration."""
    if self._config is None:
        self._config = Config(Path.cwd())
    return self._config

So the best fix would be, I believe, to implement a more solid way for your Poetry class to detect the exact project root. This could then be used in export_requirements (and probably some other places too).

I have some code from an internal tool I made, that seems to work:

path = Path.cwd()
# Find the project root path by locating the pyproject.toml file
root = Path("/")
while not (path / "pyproject.toml").exists():
    path = path.parent
    if path == root:
        raise RuntimeError("This tool only works in a development folder.")

At the end of this, path should be the actual root of the project, where you can find all of poetry's files.