⛎ Ofiuco Rules for Bazel

Overview

The repository defines Bazel installation rules for multi-platform Python lock files. The major difference to pip rules in rules_python is that Python packages are installed as py_library targets and not as external repositories. This allows to use platform information of resolved Python toolchains and build cross-platform Python artifacts.

Minimum requirements:

• Bazel 8.x and rules_python with registered Python >= 3.11 toolchain.

Getting started

Update lock files

A lock file in the workspace can be updated using a host Python interpreter as

python3 -m pip install poetry

poetry update

or using a pre-defined target

load("@ofiuco//python:poetry.bzl", "poetry_lock")

poetry_lock(
    name = "lock",
    toml = "pyproject.toml",
    lock = "poetry.lock",
)

In both cases the host interpreter is used in the latter case poetry package with dependencies is installed as an external repository.

Import ofiuco as a module

To import ofiuco in your project, you first need to add it to your MODULE.bazel file

bazel_dep(name = "rules_python", version = "1.9.0")

python = use_extension("@rules_python//python/extensions:python.bzl", "python")
python.toolchain(python_version = "3.13")
use_repo(python, "python_3_13")

bazel_dep(name = "ofiuco", version = "0.9.0")

parse = use_extension("@ofiuco//python:extensions.bzl", "parse")
parse.lock(
    name = "python",
    lock = "@//path/to:poetry_or_uv.lock",
    toml = "@//path/to:pyproject.toml",
)
use_repo(parse, "python")

and Python dependencies can be used as

py_library(
    name = "mylib",
    srcs = ["mylib.py"],
    deps = [
        "@python//:package1",
        "@python//:package2",
    ]
)

or to include all Python dependencies you can use :all synthetic target as

py_library(
    name = "mylib",
    srcs = ["mylib.py"],
    deps = [
        "@python//:all",
    ]
)

If all is a legit package name then the synthetic target will have one or more underscores to disambiguate names.

Update uv.lock.json

cargo install --git https://github.com/bazel-contrib/multitool
fish_add_path $HOME/.cargo/bin

multitool --lockfile python/private/uv.lock.json update

Building at Windows platforms

1. Install Scoop https://github.com/ScoopInstaller/Install?tab=readme-ov-file#for-admin

irm get.scoop.sh -outfile 'install.ps1'
.\install.ps1 -RunAsAdmin

2. Install git and emacs

scoop install git
scoop bucket add extras
scoop install grep emacs bazelisk zip unzip python vcredist2022 WinDirStat
scoop bucket add milnak https://github.com/milnak/scoop-bucket
scoop install milnak/windbg

3. Instal VisualStudio build tools

# Source - https://stackoverflow.com/a
# Posted by caiohamamura, modified by community. See post 'Timeline' for change history
# Retrieved 2025-12-31, License - CC BY-SA 4.0

winget install Microsoft.VisualStudio.2022.BuildTools --force --override "--wait --passive --add Microsoft.VisualStudio.Component.VC.Tools.x86.x64 --add Microsoft.VisualStudio.Component.Windows10SDK"

4. Set Python files associations cmd /c assoc .py=Python.File cmd /c assoc .pyz=Python.File cmd /c ftype Python.File="C:\Users\Administrator\scoop\apps\python\current\python.exe" "%1" %*

winget install Microsoft.VisualStudio.2022.BuildTools

5. Checkout ofiuco

git clone git://oxidase@github.com/oxidase/ofiuco/ cd ofiuco bazelisk test //...