build(release): build tools for more python-build-standalone platforms (#4248) Prebuilt tools need to run wherever rules_python runs Python, i.e. on every platform that python-build-standalone supports. Linux x86_64 runners now also cross-compile static musl binaries for armv7, i686, ppc64le and riscv64, and a Windows x86_64 runner cross-compiles for 32-bit Windows with MSVC's x86 tools. Static Linux binaries don't depend on the system's libc, so one binary per CPU covers both glibc and musl, and arm64e Macs run the aarch64 binary. No job builds s390x yet: Rust has no musl std for it, and a static glibc build needs a C cross toolchain. The release transition now passes +crt-static for musl too, since Rust links musl dynamically by default for some CPUs, e.g. riscv64. crate_universe now resolves the crates' conditional deps for triples that match the release platforms by CPU and OS, and no longer marks the crates incompatible with other platforms, since rules_rust has no ppc64le triple. With the default triples, the crates were incompatible with e.g. x86_64 macOS and arm64 Windows, so those existing jobs would only have warned. The Linux Rust toolchain set is renamed to rust_release_linux to shorten its labels. Its name, and the new Windows set's, must sort after rules_rust's default sets' so that the defaults' x86_64 toolchains take precedence. Work towards #4216
This repository is the home of the core Python rules -- py_library, py_binary, py_test, and related symbols that provide the basis for Python support in Bazel. It also contains package installation rules for integrating with PyPI and other indices.
Documentation for rules_python is at https://rules-python.readthedocs.io and in the Bazel Build Encyclopedia.
Examples live in the examples directory.
The core rules are stable. Their implementation is subject to Bazel's backward compatibility policy. This repository aims to follow semantic versioning.
The Bazel community maintains this repository. Neither Google nor the Bazel team provides support for the code. However, this repository is part of the test suite used to vet new Bazel releases. See How to contribute page for information on our development workflow.
requirements.txt is how users have been defining dependencies for a long time. We support this to support legacy usecases or package managers that we don't support directly. Any additional information that we need will be retrieved from the SimpleAPI during the bzlmod extension evaluation phase. Then it will be written to the MODULE.bazel.lock file for future reuse. We have plans to support uv.lock file directly. uv is recommended for generating a fully locked requirements.txt file and we do provide a rule for it.py_binary, py_test rules should scale to large monorepos and we work hard to minimize the work done during analysis and build phase. What is more, the space requirements for should be minimal, so we strive to use symlinks rather than extracting wheels at build time. This means that for different configurations of the same build, we are not extracting the wheel multiple times thus scaling better over the time. From 2.0 onwards we are creating a virtual env for each target by creating an actual minimal virtual environment using symlinks. We plan on creating the traditional site-packages layout in the future by default.rules_python and this has resulted in a few PEPs supported within pure starlark - PEP440, PEP509.Common misconceptions:
rules_python has to keep backwards compatibility with google3. Whilst this might have been true in the past, rules_python is an open source project and any compatibility needs should come from the community - we have no requirement to keep this compatibility and are allowed to make our decisions. However, we do want to keep backwards compatibility as long as possible to not upset users with never ending migrations.rules_python is not caching pip downloads. With 2.0, we use Bazel's downloader by default and rely on bazel to provide the repository caching mechanisms. This means that for simpler setups this should result in transparent and scalable caching with the most recent bazel versions unless there are issues in the bazel itself.For detailed documentation, see https://rules-python.readthedocs.io
See Bzlmod support for more details.