Version number management

As explained in Code organization, the metatensor git repository contains multiple packages — each with its own version number — for multiple languages — each with their own way of managing versions numbers. This page explains how we handle versions and how to update version number for a release.

The core idea is that the version number stored in source file will always be the last released version, and when handling development versions we dynamically change this version number if necessary.

The overall sources of truth for version numbers are:

  • the version field in metatensor-core/Cargo.toml for metatensor-core C, C++ API and Python API. This needs to be manually duplicated as the version field in rust/metatensor-sys/Cargo.toml.

  • the version field in rust/metatensor/Cargo.toml for the metatensor Rust crate.

  • the VERSION file in metatensor-torch/ for metatensor-torch C++ and Python API.

  • the METATENSOR_OPERATIONS_VERSION variable in python/metatensor-operations/ for the metatensor-operations Python package.

  • the METATENSOR_LEARN_VERSION variable in python/metatensor-learn/ for the metatensor-learn Python package.

  • the METATENSOR_VERSION variable in for the metatensor Python package.

When doing a build from a git checkout, we use scripts/ to determine the number of commits since the last tag matching the current package. If there where no commits since the last tag, the version number from the list above is kept as-is. If there where commits, the version number if updated, and a dev<X> suffix is added to indicate this is a development version.

Doing a release

When doing a release of any of the packages, the first step is to determine the new version number using semantic versioning rules. Then, you should update the version number at the right location from the list above. Finally, you should add a tag on the corresponding commit, following this naming convention (replacing <x.y.z> with the new version number).

  • metatensor-core-v<x.y.z> for releases of metatensor-core;

  • metatensor-torch-v<x.y.z> for releases of metatensor-torch;

  • metatensor-python-v<x.y.z> for releases of the Python metatensor package;

  • metatensor-operations-v<x.y.z> for releases of the Python metatensor-operations package;

  • metatensor-rust-v<x.y.z> for releases of the Rust metatensor crate;

When releasing multiple packages at the same time, the corresponding commit will have multiple tags.

The tag should be pushed to GitHub and the CI will build the code and create the corresponding releases, and deploy the documentation for this release on GitHub pages. Once this is done, you should update the release descriptions on GitHub, and add links to the new releases version on the API references pages.