This is a human-friendly changelog in a keepachangelog.com style format. Because this changelog is for end-user consumption of meaningful changes,only a summary of a release‘s changes is described. This means every commit is not necessarily mentioned, and internal refactors or code cleanups are omitted unless they’re particularly notable.
A brief description of the categories of changes:
Changed: Some behavior changed. If the change is expected to break a public API or supported behavior, it will be marked as BREAKING. Note that beta APIs will not have breaking API changes called out.Fixed: A bug, or otherwise incorrect behavior, was fixed.Added: A new feature, API, or behavior was added in a backwards compatible manner.(bzlmod) or (docs).PyInfo is not the same as what is loaded from rules_python. The same is true of PyRuntimeInfo.(toolchains) Windows hosts always ignore pyc files in the downloaded runtimes. This fixes issues due to pyc files being created at runtime and affecting the definition of what files were considered part of the runtime.
(pip_parse) Added the envsubst parameter, which enables environment variable substitutions in the extra_pip_args attribute.
(pip_repository) Added the envsubst parameter, which enables environment variable substitutions in the extra_pip_args attribute.
(bzlmod) pip.parse now does not fail with an empty requirements.txt.
(py_wheel) Wheels generated by py_wheel now preserve executable bits when being extracted by installer and/or pip.
(coverage) During the running of lcov, the stdout/stderr was causing test failures. By default, suppress output when generating lcov. This can be overridden by setting ‘VERBOSE_COVERAGE’. This change only affect bazel 7.x.x and above.
(toolchain) Changed the host_toolchain to symlink all files to support Windows host environments without symlink support.
(PyRuntimeInfo) Switch back to builtin PyRuntimeInfo for Bazel 6.4 and when pystar is disabled. This fixes an error about target ... does not have ... PyRuntimeInfo. (#1732)
(py_wheel) Added requires_file and extra_requires_files attributes.
(whl_library) experimental_target_platforms now supports specifying the Python version explicitly and the output BUILD.bazel file will be correct irrespective of the python interpreter that is generating the file and extracting the whl distribution. Multiple python target version can be specified and the code generation will generate version specific dependency closures but that is not yet ready to be used and may break the build if the default python version is not selected using common --@rules_python//python/config_settings:python_version=X.Y.Z.
New Python versions available: 3.11.7, 3.12.1 using https://github.com/indygreg/python-build-standalone/releases/tag/20240107.
(toolchain) Allow setting x.y as the python_version parameter in the version-aware py_binary and py_test rules. This allows users to use the same rule import for testing with specific Python versions and rely on toolchain configuration and how the latest version takes precedence if e.g. 3.8 is selected. That also simplifies .bazelrc for any users that set the default python_version string flag in that way.
(toolchain) The runtime's shared libraries (libpython.so et al) can be accessed using @rules_python//python/cc:current_py_cc_libs. This uses toolchain resolution, so the files are from the same runtime used to run a target. If you were previously using e.g. @python_3_11//:libpython, then switch to :current_py_cc_libs for looser coupling to the underlying runtime repo implementation.
(repo rules) The environment variable RULES_PYTHON_REPO_DEBUG=1 can be set to make repository rules log detailed information about what they're up to.
(coverage) Add support for python 3.12 and bump coverage.py to 7.4.1.
incompatible_generate_aliases feature flags from pip_parse and gazelle got removed. They had been flipped to True in 0.27.0 release.incompatible_normalize_name and incompatible_normalize_version flags have been removed. They had been flipped to True in 0.27.0 release.X.Y python version notation. This improves cross module interoperability and allows to share wheels built by interpreters using different patch versions.(bzlmod pip.parse) Use a platform-independent reference to the interpreter pip uses. This reduces (but doesn't eliminate) the amount of platform-specific content in MODULE.bazel.lock files; Follow #1643 for removing platform-specific content in MODULE.bazel.lock files.
(wheel) The stamp variables inside the distribution name are no longer lower-cased when normalizing under PEP440 conventions.
(toolchains) python_register_toolchains now also generates a repository that is suffixed with _host, that has a single label :python that is a symlink to the python interpreter for the host platform. The intended use is mainly in repository_rule, which are always run using host platform Python. This means that WORKSPACE users can now copy the requirements.bzl file for vendoring as seen in the updated pip_parse_vendored example.
(runfiles) rules_python.python.runfiles.Runfiles now has a static Create method to make imports more ergonomic. Users should only need to import the Runfiles object to locate runfiles.
(toolchains) PyRuntimeInfo now includes a interpreter_version_info field that contains the static version information for the given interpreter. This can be set via py_runtime when registering an interpreter toolchain, and will done automatically for the builtin interpreter versions registered via python_register_toolchains. Note that this only available on the Starlark implementation of the provider.
(config_settings) Added //python/config_settings:is_python_X.Y config settings to match on minor Python version. These settings match any X.Y version instead of just an exact X.Y.Z version.
BREAKING (pip_install) the deprecated pip_install macro and related items have been removed.
BREAKING Support for Bazel 5 has been officially dropped. This release was only partially tested with Bazel 5 and may or may not work with Bazel 5. Subequent versions will no longer be tested under Bazel 5.
(runfiles) rules_python.python.runfiles now directly implements type hints and drops support for python2 as a result.
(toolchains) py_runtime, py_runtime_pair, and PyRuntimeInfo now use the rules_python Starlark implementation, not the one built into Bazel. NOTE: This only applies to Bazel 6+; Bazel 5 still uses the builtin implementation.
(pip_parse) The parameter experimental_requirement_cycles may be provided a map of names to lists of requirements which form a dependency cycle. pip_parse will break the cycle for you transparently. This behavior is also available under bzlmod as pip.parse(experimental_requirement_cycles={}).
(toolchains) py_runtime can now take an executable target. Note: runfiles from the target are not supported yet. (#1612)
(gazelle) When python_generation_mode is set to file, create one py_binary target for each file with if __name__ == "__main__" instead of just one py_binary for the whole module.
(gazelle) the Gazelle manifest integrity field is now optional. If the requirements argument to gazelle_python_manifest is unset, no integrity field will be generated.
(gazelle) The gazelle plugin helper was not working with Python toolchains 3.11 and above due to a bug in the helper components not being on PYTHONPATH.
(pip_parse) The repositories created by whl_library can now parse the whl METADATA and generate dependency closures irrespective of the host platform the generation is executed on. This can be turned on by supplying experimental_target_platforms = ["all"] to the pip_parse or the bzlmod equivalent. This may help in cases where fetching wheels for a different platform using download_only = True feature.
(bzlmod pip.parse) The pip.parse(python_interpreter) arg now works for specifying a local system interpreter.
(bzlmod pip.parse) Requirements files with duplicate entries for the same package (e.g. one for the package, one for an extra) now work.
(bzlmod python.toolchain) Submodules can now (re)register the Python version that rules_python has set as the default. (#1638)
(whl_library) Actually use the provided patches to patch the whl_library. On Windows the patching may result in files with CRLF line endings, as a result the RECORD file consistency requirement is lifted and now a warning is emitted instead with a location to the patch that could be used to silence the warning. Copy the patch to your workspace and add it to the list if patches for the wheel file if you decide to do so.
(coverage): coverage reports are now created when the version-aware rules are used. (#1600)
(toolchains) Workspace builds register the py cc toolchain (bzlmod already was). This makes e.g. //python/cc:current_py_cc_headers Just Work. (#1669)
(bzlmod python.toolchain) The value of ignore_root_user_error is now decided by the root module only. (#1658)
file generation mode can now also add __init__.py to the srcs attribute for every target in the package. This is enabled through a separate directive python_generation_mode_per_file_include_init.Make //python/pip_install:pip_repository_bzl bzl_library target internal as all of the publicly available symbols (etc. package_annotation) are re-exported via //python:pip_bzl bzl_library.
(gazelle) Gazelle Python extension no longer has runtime dependencies. Using GAZELLE_PYTHON_RUNTIME_DEPS from @rules_python_gazelle_plugin//:def.bzl is no longer necessary.
(pip_parse) The installation of pip_parse repository rule toolchain dependencies is now done as part of py_repositories call.
(pip_parse) The generated requirements.bzl file now has an additional symbol all_whl_requirements_by_package which provides a map from the normalized PyPI package name to the target that provides the built wheel file. Use pip_utils.normalize_name function from @rules_python//python:pip.bzl to convert a PyPI package name to a key in the all_whl_requirements_by_package map.
(pip_parse) The flag incompatible_generate_aliases has been flipped to True by default on non-bzlmod setups allowing users to use the same label strings during the transition period. For example, instead of @pypi_foo//:pkg, you can now use @pypi//foo or @pypi//foo:pkg. Other labels that are present in the foo package are dist_info, whl and data. Note, that the @pypi_foo//:pkg labels are still present for backwards compatibility.
(gazelle) The flag use_pip_repository_aliases is now set to True by default, which will cause gazelle to change third-party dependency labels from @pip_foo//:pkg to @pip//foo by default.
The compile_pip_requirements now defaults to pyproject.toml if the src or requirements_in attributes are unspecified, matching the upstream pip-compile behaviour more closely.
(gazelle) Use relative paths if possible for dependencies added through the use of the resolve directive.
(gazelle) When using python_generation_mode file, one py_test target is made per test file even if a target named __test__ or a file named __test__.py exists in the same package. Previously in these cases there would only be one test target made.
Breaking changes:
(pip) pip_install repository rule in this release has been disabled and will fail by default. The API symbol is going to be removed in the next version, please migrate to pip_parse as a replacement. The pip_parse rule no longer supports requirements attribute, please use requirements_lock instead.
(py_wheel) switch incompatible_normalize_name and incompatible_normalize_version to True by default to enforce PEP440 for wheel names built by rules_python.
(tools/wheelmaker.py) drop support for Python 2 as only Python 3 is tested.
Skip aliases for unloaded toolchains. Some Python versions that don't have full platform support, and referencing their undefined repositories can break operations like bazel query rdeps(...).
Python code generated from proto_library with strip_import_prefix can be imported now.
(py_wheel) Produce deterministic wheel files and make RECORD file entries follow the order of files written to the .whl archive.
(gazelle) Generate a single py_test target when gazelle:python_generation_mode project is used.
(gazelle) Move waiting for the Python interpreter process to exit to the shutdown hook to make the usage of the exec.Command more idiomatic.
(toolchains) Keep tcl subdirectory in Windows build of hermetic interpreter.
(bzlmod) sub-modules now don't have the //conditions:default clause in the hub repos created by pip.parse. This should fix confusing error messages in case there is a misconfiguration of toolchains or a bug in rules_python.
(bzlmod) Added .whl patching support via patches and patch_strip arguments to the new pip.override tag class.
(pip) Support for using PEP621 compliant pyproject.toml for creating a resolved requirements.txt file.
(utils) Added a pip_utils struct with a normalize_name function to allow users to find out how rules_python would normalize a PyPI distribution name.
Python version patch level bumps:
(deps) Upgrade rules_go 0.39.1 -> 0.41.0; this is so gazelle integration works with upcoming Bazel versions
(multi-version) The distribs attribute is no longer propagated. This attribute has been long deprecated by Bazel and shouldn't be used.
Calling //python:repositories.bzl#py_repositories() is required. It has always been documented as necessary, but it was possible to omit it in certain cases. An error about @rules_python_internal means the py_repositories() call is missing in WORKSPACE.
(bzlmod) The pip.parse extension will generate os/arch specific lock file entries on bazel>=6.4.
(bzlmod, entry_point) Added py_console_script_binary, which allows adding custom dependencies to a package's entry points and customizing the py_binary rule used to build it.
New Python versions available: 3.8.17, 3.11.5 using https://github.com/indygreg/python-build-standalone/releases/tag/20230826.
(gazelle) New # gazelle:python_generation_mode file directive to support generating one py_library per file.
(python_repository) Support netrc and auth_patterns attributes to enable authentication against private HTTP hosts serving Python toolchain binaries.
//python:packaging_bzl added, a bzl_library for the Starlark files //python:packaging.bzl requires.
(py_wheel) Added the incompatible_normalize_name feature flag to normalize the package distribution name according to latest Python packaging standards. Defaults to False for the time being.
(py_wheel) Added the incompatible_normalize_version feature flag to normalize the package version according to PEP440 standard. This also adds support for local version specifiers (versions with a + in them), in accordance with PEP440. Defaults to False for the time being.
New Python versions available: 3.8.18, 3.9.18, 3.10.13, 3.11.6, 3.12.0 using https://github.com/indygreg/python-build-standalone/releases/tag/20231002. 3.12.0 support is considered beta and may have issues.
(bzlmod) The entry_point macro is no longer supported and has been removed in favour of the py_console_script_binary macro for bzlmod users.
(bzlmod) The pip.parse no longer generates {hub_name}_{py_version} hub repos as the entry_point macro has been superseded by py_console_script_binary.
(bzlmod) The pip.parse no longer generates {hub_name}_{distribution} hub repos.
(whl_library) No longer restarts repository rule when fetching external dependencies improving initial build times involving external dependency fetching.
(gazelle) Improve runfiles lookup hermeticity.
pip.parse can no longer automatically use the default Python version; this was an unreliable and unsafe behavior. The python_version arg must always be explicitly specified.main arg is now correctly computed and usually optional.pip.parse no longer requires a call for whatever the configured default Python version is.@python_aliases renamed to `@python_versionspip.parse arg name renamed to hub_namepip.parse arg incompatible_generate_aliases removed and always true.pip.parse can be called multiple times with different Python versionspip.parse to reference the default python toolchain and interpreterwhl_modsDescription-Content-Type and Summary in METADATAProject-URLgenerate_hashes arg (default True) to control generating hashes