setuptools_scm >= 7 source distributions (sdist) install as version 0.0

[jbarlow83]

Any sdist tarball produced by setuptools_scm >= 7 configured to replace setuptools_scm_git_archive, without writing a _version.py file... will end up installed as version 0.0.

To reproduce:

• download the attached archive - a minimal Git repo in a tarball
• extract archive
• confirm that git describe reports version 2.0.0
• note that .git-archival.txt and .gitattributes are present in the documented formats
• python -m setuptools_scm reports version 2.0.0
• create a sdist (e.g. python -m build --sdist or python setup.py sdist, doesn't matter which is used)
• create and activate virtual environment python -m venv v
• install sdist to virtual environment pip install dist/setuptools_scm_sdist-2.0.0.tar.gz
• "Successfully installed setuptools-scm-sdist-0.0"
• python3 -c "import setuptools_scm_sdist" returns 0.0 (it just uses importlib.metadata to look up its installed version and prints it)

I included the whole Git repo in case some feature of the Git repository itself is responsible.

It does not matter if setup.py is just setup() or setup(use_scm_version=True...).

Inspecting the sdist tarballs shows PKG-INFO correct but no substitutions are made in .git_archival.txt.

Using "git archive" to manually create a tarball does produce the expected substitutions.

Versions: setuptools_scm 7.0.4, setuptools 63.1.0, Python 3.9.13, git 2.32.0
setuptools_scm_sdist.tar.gz