Add support to install dependencies from code repository

[bbgw]

Phenomena

Migrating from requirements.txt

pandas
"git+https://github.com/a_project/a_repo.git"

to pyproject.toml and using Flit:

[build-system]
requires = ["flit_core >=3.2,<4"]
build-backend = "flit_core.buildapi"

[project]
name = "a_project"
dependencies = [
    "pandas",
    "git+https://github.com/a_project/a_repo.git"
]

With the above illustrated pyproject.toml, flit build results in error reading:

$ flit build
Could not parse requirement: 'git+https://github.com/a_project/a_repo.git'  E-flit.validate
Config error: Invalid config values (see log)

Expected Behavior

Expects dependency installation works, being consistent with pip install from a requirements.txt.

Reference

pip install dependencies from VCS

[bbgw]

Figured it out and closing off the issue.

For anyone here, the problem is with the dependency format. (See StackOverflow):

a_repo_pkgname @ git+https://github.com/a_project/a_repo.git

[palao]

Indeed it works for flit build. But it fails for flit publish:

requests.exceptions.HTTPError: 400 Client Error: Invalid value for requires_dist. Error: Can't have direct dependency: 'a_repo_pkgname @ git+https://github.com/a_project/a_repo.git' for url: https://upload.pypi.org/legacy/

Any idea?

[palao]

It seems to be the policy of PyPI to reject dependencies that are code repositories. Have a look at this.
Nothing to do with flit, as far as I can understand.

The only relevant thing is: flit displayed a python traceback when trying to publish.