pyproject.toml

Just add setuptools-git-versioning to build-sytem section of your pyproject.toml, add a section tool.setuptools-git-versioning with config options, and mark the project version as dynamic.

[build-system]
requires = [ "setuptools>=41", "wheel", "setuptools-git-versioning>=3.0,<4", ]
build-backend = "setuptools.build_meta"

[tool.setuptools-git-versioning]
enabled = true

[project]
dynamic = ["version"]

And check the package version generated (see command help):

$ python -m setuptools_git_versioning
0.0.1

# or

$ setuptools-git-versioning
0.0.1

When add a git tag:

$ git add .
$ git commit -m "Test tagged"
$ git tag 1.2.3

And now version is based on git tag:

$ setuptools-git-versioning
1.2.3

$ echo 1 > uncommitted.change
$ git add .
$ setuptools-git-versioning
1.2.3.post0+git.d2bc6516.dirty

$ git commit -m "Test committed"
$ setuptools-git-versioning
1.2.3.post1+git.d452190b

setup.py

Just add setuptools-git-versioning to setup_requires argument of setuptools.setup function call, and then add new argument setuptools_git_versioning with config options:

import setuptools

setuptools.setup(
    ...,
    setuptools_git_versioning={
        "enabled": True,
    },
    setup_requires=["setuptools-git-versioning>=3.0,<4"],
)

Commands are the same as above, plus python -m setup.py returns the same version.

dynamic-metadata

For build backends supporting dynamic-metadata 0.4+, select the registered provider in [[tool.dynamic-metadata]]. For example, with scikit-build-core 1.0+:

[build-system]
requires = [ "scikit-build-core>=1.0", "dynamic-metadata>=0.4", "setuptools-git-versioning>=3.2,<4", ]
build-backend = "scikit_build_core.build"

[project]
name = "mypackage"
dynamic = ["version"]

[[tool.dynamic-metadata]]
provider = "setuptools_git_versioning.dynamic_metadata"

[tool.setuptools-git-versioning]
enabled = true

The provider sets only version and reads options from [tool.setuptools-git-versioning]. Inline settings in [[tool.dynamic-metadata]] are not supported. The provider itself has no runtime dependency on dynamic-metadata.