Is the package name missing when pip-compiling a VCS url requirement?

[andreaswachowski]

A requirement of the form package @ git+https://... is converted by pip-compile to git+https://....

Running pip install -e . with such a line inside requirements.txt works with pip 20.0.2, but not with pip 20.1.1 anymore. It does however work after manually prefixing the VCS URL with the package identifier again.

I am only beginning to grasp the complexities of Python package management, and I am not sure whether this is an issue with pip, pip-tools, or anything in between. Having said that, I noticed
that in https://www.python.org/dev/peps/pep-0440/#direct-references, all examples are of the form package name @ VCS URL, so perhaps it has to be included in pip-compile's output?

I'd appreciate any hint on how best to proceed with this. Thanks!

Environment Versions

1. Mac OS X 10.15.5
2. Python version: Python 3.7.7
3. pip version: 20.1.1
4. pip-tools version: 5.2.1

Steps to replicate

1. Create the following files. This is already prepared in the repo https://github.com/andreaswachowski/pip-problem/, so you can just clone it.

1.1. requirements.in:

colormath @ git+https://github.com/gtaylor/python-colormath.git@6cb12bf#egg=colormath@https://github.com/gtaylor/python-colormath/tarball/6cb12bf

1.2. setup.py:

import pip
from pip._internal.network.session import PipSession
from pip._internal.req import parse_requirements
from setuptools import find_packages, setup

install_requires_g = parse_requirements("requirements.txt", session=PipSession())

if tuple(map(int, pip.__version__.split("."))) >= (20, 1):
    install_requires = [str(ir.requirement) for ir in install_requires_g]
else:
    install_requires = [str(ir.req) for ir in install_requires_g]

setup(
    name="pkg",
    install_requires=install_requires,
    version="0.1.0",
    packages=find_packages(),
)

1.3. An empty pkg/__init__.py file.

2. Execute the following steps:

python3 -m venv venv
source venv/bin/activate
pip install pip==20.1.1
pip install pip-tools==5.2.1
pip-compile requirements.in > requirements.txt
pip install -e .

Expected result

pip install -e . executes without error.

Actual result

pip install -e . returns an error:

    error in pkg setup command: 'install_requires' must be a string or list of
    strings containing valid project/version requirement specifiers; Invalid
    requirement, parse error at "'+https:/'"
    ----------------------------------------

(Edit: Make error description self-reliant, without depending on an external repository.)

[atugushev]

Hello @andreaswachowski

Thanks for the detailed issue! Currently pip-tools doesn't support <name> @ <vcs_url> format properly, see #1056 (comment). It would be nice to implement it.

[AndydeCleyre]

@andreaswachowski @askurihin @AndreyMZ

Can you please confirm that this is (would be) fixed by #1329 ?

[askurihin]

I confirm that it is fixed by #1329!

Thank you, I can (soon) remove my setup.py hack to fix this problem.

[AndydeCleyre]

This seems to be working in the latest release for me

Package       Version Editable project location
------------- ------- ---------------------------
click         8.0.3
colormath     3.0.0
networkx      2.6.3
numpy         1.22.2
pep517        0.12.0
pip           22.0.3
pip-tools     6.5.1
pkg           0.1.0   /home/andy/Code/pip-problem
pkg_resources 0.0.0
setuptools    44.1.1
tomli         2.0.1
wheel         0.37.1