relative path includes with markers generate incorrect Requires-Dist in PKG-INFO

[ossareh]

• 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: ubuntu 20.04

• Poetry version: 1.1.5

• Link of a Gist with the contents of your pyproject.toml file: https://gist.github.com/ossareh/2e4e4ec211536239f064511e04e802b1

• Discord discussion (with myself!): https://discord.com/channels/487711540787675139/487711540787675143/827241500891021363

Issue

I have a case very similar to #2802 where I am installing a vendored wheel file and it the code that generates PKG-INFO is producing an invalid line.

$ poetry add --platform linux blob/pyvcam-2.1.0-cp39-cp39-linux_x86_64.whl

results in pyproject's dependencies having:

pyvcam = {path = "blob/pyvcam-2.1.0-cp39-cp39-linux_x86_64.whl", platform = "linux"}

and during a tox run the following error:

...snip...
  File "/home/ossareh/dev/src/github.com/erisyon/vega/.tox/py39/lib/python3.9/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3023, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "/home/ossareh/dev/src/github.com/erisyon/vega/.tox/py39/lib/python3.9/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3033, in _compute_dependencies
    reqs.extend(parse_requirements(req))
  File "/home/ossareh/dev/src/github.com/erisyon/vega/.tox/py39/lib/python3.9/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3094, in parse_requirements
    yield Requirement(line)
  File "/home/ossareh/dev/src/github.com/erisyon/vega/.tox/py39/lib/python3.9/site-packages/pip/_vendor/pkg_resources/__init__.py", line 3103, in __init__
    raise RequirementParseError(str(e))
pip._vendor.pkg_resources.RequirementParseError: Parse error at "'sys_plat'": Expected stringEnd

Inside the bundle created by poetry I have:

$ grep pyvcam vega-0.1.0/PKG-INFO
Requires-Dist: pyvcam @ blob/pyvcam-2.1.0-cp39-cp39-linux_x86_64.whl; sys_platform == "linux"

According to the #2802 (linked above) I think there is meant to be a space prior to the ";". I have checked that the output of poetry build produces the same PKG-INFO entries.

I am about to submit a PR; I'm opening this issue for the context for that PR.

[cheradenine]

I got here from a google search for this same error. I'm on poetry 1.1.8. My toml references sub directories as a raw directory, not a wheel. My PKG-INFO does not have a space after the relative path:

Requires-Dist: somepackage @ lib/somepackage; sys_platform == "darwin"

the toml file has a line like this:

somepackage = [
    {path = "./lib/somepackage", develop = false, markers = "sys_platform == 'darwin' "},
]

[github-actions]

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