Packaging with uv_build

Overview

pyrig uses the uv_build backend for packaging Python projects. This modern build system integrates seamlessly with uv and provides:

Fast builds: Rust-based backend for speed
Console script integration: Automatic CLI entry points
Standard compliance: PEP 517/518 compatible
Simple configuration: Minimal pyproject.toml setup
uv ecosystem: Works with the entire uv toolchain

This guide covers packaging your pyrig-based projects and extensions.

Understanding uv_build

What is uv_build?

uv_build is a PEP 517-compliant build backend that:

Builds wheels and source distributions (sdists)
Integrates with pyproject.toml
Handles console script generation automatically
Works with uv’s dependency management

How pyrig Uses It

Every pyrig project includes this in pyproject.toml:

[build-system]
requires = ["uv_build"]
build-backend = "uv_build"

[tool.uv.build-backend]
module-name = "myproject"
module-root = ""

This configuration:

Declares uv_build as the build backend
Specifies your project’s module name
Sets the module root (usually empty string for root-level packages)

Packaging a Standard Project

Step 1: Verify pyproject.toml

Ensure your pyproject.toml has the required sections:

[project]
name = "my-project"
version = "1.0.0"
description = "My awesome project"
readme = "README.md"
license = "MIT"
requires-python = ">=3.12"
dependencies = [
    "pyrig>=10.0.0",
]

[project.scripts]
my-project = "my_project.rig.cli.cli:main"

[build-system]
requires = ["uv_build"]
build-backend = "uv_build"

[tool.uv.build-backend]
module-name = "my_project"
module-root = ""

Step 2: Build the Package

Use uv build to create distributions:

# Build wheel and sdist
uv build

# Output:
# dist/
#   my_project-1.0.0-py3-none-any.whl
#   my_project-1.0.0.tar.gz

The build creates:

Wheel (.whl): Binary distribution for fast installation
Source distribution (.tar.gz): Source code archive

Step 3: Test the Package

Test locally before publishing:

# Install from local wheel
uv pip install dist/my_project-1.0.0-py3-none-any.whl

# Test the CLI
my-project --help

# Test the package
python -c "import my_project; print(my_project.__version__)"

Step 4: Publish to PyPI

Publish using uv publish:

# Publish to PyPI (requires token)
uv publish --token $PYPI_TOKEN

# Publish to Test PyPI
uv publish --token $TEST_PYPI_TOKEN --registry https://test.pypi.org/legacy/

Packaging a pyrig Extension

Extension packages (like personal pyrig packages) have special considerations.

Example: Personal pyrig Package

Create my-pyrig/pyproject.toml:

[project]
name = "my-pyrig"
version = "1.0.0"
description = "My personal pyrig extensions and standards"
readme = "README.md"
license = "MIT"
requires-python = ">=3.12"

# Declare dependency on pyrig
dependencies = [
    "pyrig>=10.0.0",
]

# Optional: Provide a CLI for your extensions
[project.scripts]
my-pyrig = "my_pyrig.rig.cli.cli:main"

[build-system]
requires = ["uv_build"]
build-backend = "uv_build"

[tool.uv.build-backend]
module-name = "my_pyrig"
module-root = ""

# Development dependencies
[dependency-groups]
dev = [
    "pytest>=9.0.0",
    "ruff>=0.15.0",
]

Package Structure

Your extension package should include:

my-pyrig/
├── my_pyrig/
│   ├── __init__.py              # Package marker
│   ├── rig/
│   │   ├── __init__.py
│   │   ├── tools/               # Tool overrides
│   │   │   ├── __init__.py
│   │   │   └── linter.py
│   │   ├── configs/             # Config overrides
│   │   │   ├── __init__.py
│   │   │   └── company_config.py
│   │   └── cli/
│   │       ├── __init__.py
│   │       └── subcommands/     # Custom commands
│   │           ├── __init__.py
│   │           └── deploy.py
│   └── src/                     # Shared utilities
│       ├── __init__.py
│       └── utils.py
├── tests/
│   └── __init__.py
├── README.md
├── LICENSE
└── pyproject.toml

Important: _init_.py Files

Every directory must have __init__.py for proper package discovery:

# Create all __init__.py files
find my_pyrig -type d -exec touch {}/__init__.py \;

# Or use pyrig
uv run pyrig mkinits

Console Scripts

Console scripts are CLI entry points automatically created during installation.

Defining Scripts

In pyproject.toml:

[project.scripts]
my-tool = "my_project.rig.cli.cli:main"
my-util = "my_project.utils:run"

This creates:

my-tool command → calls my_project.rig.cli.cli.main()
my-util command → calls my_project.utils.run()

Entry Point Function

The entry point must be a callable:

# my_project/rig/cli/cli.py
import typer

app = typer.Typer()

@app.command()
def hello(name: str):
    """Greet someone."""
    typer.echo(f"Hello {name}!")

def main():
    """Entry point for console script."""
    app()

if __name__ == "__main__":
    main()

After installation:

my-tool hello World
# Output: Hello World!

pyrig’s CLI Pattern

pyrig projects use a standard CLI structure:

# my_project/rig/cli/cli.py
import typer
from pyrig.rig.cli.subcommands import discover_subcommands

app = typer.Typer(
    name="my-project",
    help="My project CLI",
)

# Discover and register all subcommands automatically
discover_subcommands(app, "my_project")

def main():
    """Entry point."""
    app()

Subcommands are discovered from my_project/rig/cli/subcommands/:

# my_project/rig/cli/subcommands/deploy.py
import typer

def deploy(env: str) -> None:
    """Deploy to environment."""
    typer.echo(f"Deploying to {env}...")

Automatically available:

my-project deploy production

Advanced Configuration

Module Root Configuration

If your package is not at the repository root:

[tool.uv.build-backend]
module-name = "myproject"
module-root = "src"  # Package is in src/myproject/

Directory structure:

my-repo/
├── src/
│   └── myproject/
│       ├── __init__.py
│       └── ...
└── pyproject.toml

Include/Exclude Files

Control what’s included in the distribution:

[tool.uv.build-backend]
module-name = "myproject"
module-root = ""

# Exclude patterns
exclude = [
    "tests/",
    "*.pyc",
    "__pycache__/",
    ".git/",
]

# Include additional files
include = [
    "LICENSE",
    "README.md",
    "my_project/resources/*.json",
]

Version Management

pyrig projects can use dynamic versioning:

[project]
name = "my-project"
version = "1.0.0"  # Or use dynamic versioning

To bump the version:

# Bump patch version (1.0.0 → 1.0.1)
uv version --bump patch

# Bump minor version (1.0.0 → 1.1.0)
uv version --bump minor

# Bump major version (1.0.0 → 2.0.0)
uv version --bump major

Dependency Management

Specifying Dependencies

[project]
dependencies = [
    "pyrig>=10.0.0",
    "requests>=2.28.0",
    "pydantic>=2.0.0",
]

[dependency-groups]
dev = [
    "pytest>=9.0.0",
    "ruff>=0.15.0",
    "mypy>=1.0.0",
]

test = [
    "pytest-cov>=4.0.0",
    "pytest-mock>=3.0.0",
]

Dependency Chain

When packaging extensions, dependencies cascade:

pyrig (base)
  ↓ requires: typer
my-pyrig (extension)
  ↓ requires: pyrig, custom-lib
my-project (uses extension)
  ↓ requires: my-pyrig, fastapi

Installing my-project automatically installs the entire chain!

Optional Dependencies

[project.optional-dependencies]
docs = [
    "mkdocs>=1.5.0",
    "mkdocs-material>=9.0.0",
]

cloud = [
    "boto3>=1.26.0",
    "google-cloud-storage>=2.0.0",
]

Install with:

uv pip install my-project[docs]
uv pip install my-project[cloud]
uv pip install my-project[docs,cloud]

Building for Distribution

Local Development Build

For testing during development:

# Install in editable mode
uv pip install -e .

# Make changes to code
vim my_project/rig/tools/custom.py

# Changes are immediately available
my-project --help  # Uses latest code

Production Build

For distribution:

# Clean previous builds
rm -rf dist/ build/ *.egg-info

# Build fresh
uv build

# Verify contents
tar -tzf dist/my_project-1.0.0.tar.gz | head -20
unzip -l dist/my_project-1.0.0-py3-none-any.whl | head -20

Automated Builds

In CI/CD (GitHub Actions):

name: Build and Publish

on:
  release:
    types: [published]

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      
      - name: Install uv
        run: curl -LsSf https://astral.sh/uv/install.sh | sh
      
      - name: Build package
        run: uv build
      
      - name: Publish to PyPI
        env:
          PYPI_TOKEN: ${{ secrets.PYPI_TOKEN }}
        run: uv publish --token $PYPI_TOKEN

Publishing Strategies

Test PyPI First

Always test on Test PyPI before production:

# Build
uv build

# Publish to Test PyPI
uv publish \
  --token $TEST_PYPI_TOKEN \
  --registry https://test.pypi.org/legacy/

# Test installation
uv pip install \
  --index-url https://test.pypi.org/simple/ \
  --extra-index-url https://pypi.org/simple/ \
  my-project

# If everything works, publish to real PyPI
uv publish --token $PYPI_TOKEN

Version Strategy

Use semantic versioning:

Major (1.0.0 → 2.0.0): Breaking changes
Minor (1.0.0 → 1.1.0): New features, backward compatible
Patch (1.0.0 → 1.0.1): Bug fixes

# After bug fix
uv version --bump patch
git add pyproject.toml
git commit -m "Bump version to $(uv version --short)"
git tag "v$(uv version --short)"
git push --tags

Private Package Indexes

For internal packages:

# Publish to private index
uv publish \
  --token $PRIVATE_TOKEN \
  --registry https://pypi.internal.company.com/

# Install from private index
uv pip install \
  --index-url https://pypi.internal.company.com/simple/ \
  my-private-package

Configure in pyproject.toml:

[tool.uv]
index-url = "https://pypi.internal.company.com/simple/"
extra-index-url = ["https://pypi.org/simple/"]

Overriding Build Backend

You can override the build backend in your extensions:

Using Poetry

# my_pyrig/rig/tools/package_manager.py
from pyrig.rig.tools.package_manager import PackageManager as PyrigPM

class PackageManager(PyrigPM):
    """Override to use Poetry instead of uv."""
    
    def build_system_requires(self) -> list[str]:
        """Use Poetry for builds."""
        return ["poetry-core"]
    
    def build_backend(self) -> str:
        """Poetry build backend."""
        return "poetry.core.masonry.api"

Now all projects using your extension will use Poetry!

Using Setuptools

class PackageManager(PyrigPM):
    def build_system_requires(self) -> list[str]:
        return ["setuptools>=68.0", "wheel"]
    
    def build_backend(self) -> str:
        return "setuptools.build_meta"

Using Hatch

class PackageManager(PyrigPM):
    def build_system_requires(self) -> list[str]:
        return ["hatchling"]
    
    def build_backend(self) -> str:
        return "hatchling.build"

Common Issues and Solutions

Issue: Module Not Found

ModuleNotFoundError: No module named 'my_project'

Solution: Ensure module-name matches your package directory:

[tool.uv.build-backend]
module-name = "my_project"  # Must match my_project/ directory

Issue: Console Script Not Working

my-tool: command not found

Solution: Check entry point syntax:

[project.scripts]
my-tool = "my_project.cli:main"  # module.submodule:function

Verify the function exists:

# my_project/cli.py
def main():
    print("Hello!")

Issue: Missing Files in Distribution

Solution: Include them explicitly:

[tool.uv.build-backend]
include = [
    "my_project/data/*.json",
    "my_project/templates/*.html",
]

Issue: Import Errors After Install

Solution: Ensure all directories have __init__.py:

uv run pyrig mkinits

Next Steps

Extending pyrig - Create your extension package
Creating Custom Tools - Add custom tools
Publishing Guide - Detailed publishing workflow
uv Documentation - Learn more about uv

Best Practices

Version carefully: Use semantic versioning
Test locally: Install from wheel before publishing
Use Test PyPI: Verify everything works before production
Include LICENSE: Always include license file
Write good README: Help users get started
Document dependencies: Explain what your package needs
Tag releases: Use git tags for version tracking
Automate: Use CI/CD for consistent builds
Keep it simple: Minimal configuration is best
Follow conventions: Study pyrig’s own pyproject.toml

Get Started

Core Concepts

CLI Reference

Configuration

Tools

Builders

Testing

Guides

​Overview

​Understanding uv_build

​What is uv_build?

​How pyrig Uses It

​Packaging a Standard Project

​Step 1: Verify pyproject.toml

​Step 2: Build the Package

​Step 3: Test the Package

​Step 4: Publish to PyPI

​Packaging a pyrig Extension

​Example: Personal pyrig Package

​Package Structure

​Important: _init_.py Files

​Console Scripts

​Defining Scripts

​Entry Point Function

​pyrig’s CLI Pattern

​Advanced Configuration

​Module Root Configuration

​Include/Exclude Files

​Version Management

​Dependency Management

​Specifying Dependencies

​Dependency Chain

​Optional Dependencies

​Building for Distribution

​Local Development Build

​Production Build

​Automated Builds

​Publishing Strategies

​Test PyPI First

​Version Strategy

​Private Package Indexes

​Overriding Build Backend

​Using Poetry

​Using Setuptools

​Using Hatch

​Common Issues and Solutions

​Issue: Module Not Found

​Issue: Console Script Not Working

​Issue: Missing Files in Distribution

​Issue: Import Errors After Install

​Next Steps

​Best Practices

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