Dynamic version from setuptools_scm prevents packaging from github tag archives

[JasonGantner]

The source archives provided by github as tagged releases do not contain the .git directory which prevents setuptools_scm to guess the version number. Which in turn make the packaging process fail.

Could you update the method for versionning inside pyproject.toml to allow packaging based on tagged releases ?

[jwbargsten]

It would be nice if you could give a bit more background on this. There are plenty of options to check out a specific tag using standard git commands. To download the source from github as zip or tar.gz and build a package from it is a flow is not supported currently. setuptools_scm gives already sufficient alternatives in the error message:

LookupError: setuptools-scm was unable to detect version for pytest-archon-0.0.6.

Make sure you're either building from a fully intact git repository or PyPI tarballs. Most other sources (such as GitHub's tarballs, a git checkout without the .git folder) don't contain the necessary metadata and will not work.

For example, if you're using pip, instead of https://github.com/user/proj/archive/master.zip use git+https://github.com/user/proj.git#egg=proj

If you have a legit use case, I'm happy to have a look.

[jwbargsten]

And of course: pull requests are welcome :)