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Contributing to sigstore

Thank you for your interest in contributing to sigstore!

The information below will help you set up a local development environment, as well as performing common development tasks.

Requirements

sigstore's only development environment requirement should be Python 3.9 or newer. Development and testing is actively performed on macOS and Linux, but Windows and other supported platforms that are supported by Python should also work.

If you're on a system that has GNU Make, you can use the convenience targets included in the Makefile that comes in the sigstore repository detailed below. But this isn't required; all steps can be done without Make.

Development steps

First, clone this repository:

git clone https://github.com/sigstore/sigstore-python
cd sigstore

Then, use one of the Makefile targets to run a task. The first time this is run, this will also set up the local development virtual environment, and will install sigstore as an editable package into this environment.

Any changes you make to the sigstore source tree will take effect immediately in the virtual environment.

Linting

You can lint locally with:

make lint

sigstore is automatically linted and formatted with a collection of tools:

  • ruff: Code formatting, PEP-8 linting, style enforcement
  • mypy: Static type checking
  • bandit: Security issue scanning
  • interrogate: Documentation coverage

To automatically apply any lint-suggested changes, you can run:

make reformat

Testing

You can run the tests locally with:

make test

or:

make test-interactive

to run tests that require OIDC credentials (will prompt for authentication to generate tokens). Note that test-interactive may fail if you have a slow network, as the tokens generated are only valid for 60 seconds after their issuance.

You can also filter by a pattern (uses pytest -k):

make test TESTS=test_version

To test a specific file:

make test T=path/to/file.py

sigstore has a pytest-based unit test suite, including code coverage with coverage.py.

X.509 test cases

sigstore includes some checked-in X.509 test assets under test/unit/assets/x509.

These assets are generated by the adjacent build-testcases.py script, which can be updated to generate additional test cases.

To re-build the X.509 test cases, you can use make:

make gen-x509-testcases

Documentation

If you're running Python 3.9 or newer, you can run the documentation build locally:

make doc

sigstore uses pdoc to generate HTML documentation for the public Python APIs.

Releasing

NOTE: If you're a non-maintaining contributor, you don't need the steps here! They're documented for completeness and for onboarding future maintainers.

Releases of sigstore are managed with bump and GitHub Actions.

# default release (patch bump)
make release

# override the default
# vX.Y.Z -> vX.Y.Z-rc.0
make release BUMP_ARGS="--pre rc.0"

# vX.Y.Z -> vN.0.0
make release BUMP_ARGS="--major"

make release will fail if there are any untracked changes in the source tree.

If make release succeeds, you'll see an output like this:

RUN ME MANUALLY: git push origin main && git push origin vX.Y.Z

Run that last command sequence to complete the release.

Development practices

Here are some guidelines to follow if you're working on a new feature or changes to sigstore's internal APIs:

  • Keep the sigstore APIs as private as possible. Nearly all of sigstore's APIs should be private and treated as unstable and unsuitable for public use. If you're adding a new module to the source tree, prefix the filename with an underscore to emphasize that it's an internal (e.g., sigstore/_foo.py instead of sigstore/foo.py).

  • Perform judicious debug logging. sigstore uses the standard Python logging module. Use logger.debug early and often -- users who experience errors can submit better bug reports when their debug logs include helpful context!

  • Update the CHANGELOG. If your changes are public or result in changes to sigstore's CLI, please record them under the "Unreleased" section, with an entry in an appropriate subsection ("Added", "Changed", "Removed", or "Fixed").

  • Ensure your commits are signed off, as sigstore uses the DCO. You can do it using git commit -s, or git commit -s --amend if you want to amend already existing commits.