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Release Checklist

Main Release

Released quarterly on the first day of January, April, July, October.

  • Open a release ticket e.g. python-pillow#3154
  • Develop and prepare release in master branch.
  • Check Travis CI and AppVeyor CI to confirm passing tests in master branch.
  • Check that all of the wheel builds Pillow Wheel Builder pass the tests in Travis CI.
  • In compliance with PEP 440, update version identifier in src/PIL/_version.py
  • Update CHANGES.rst.
  • Run pre-release check via make release-test in a freshly cloned repo.
  • Create branch and tag for release e.g.: 
    git branch 5.2.x
git tag 5.2.0
git push --all
git push --tags
  • Create source distributions e.g.: 
    make sdist
  • Create binary distributions
  • Upload all binaries and source distributions e.g. twine upload dist/Pillow-5.2.0*
  • Create a new release on GitHub
  • In compliance with PEP 440, increment and append .dev0 to version identifier in src/PIL/_version.py

Point Release

Released as needed for security, installation or critical bug fixes.

  • Make necessary changes in master branch.
  • Update CHANGES.rst.
  • Check out release branch e.g.: 
    git checkout -t remotes/origin/5.2.x
  • Cherry pick individual commits from master branch to release branch e.g. 5.2.x.
  • Check Travis CI to confirm passing tests in release branch e.g. 5.2.x.
  • In compliance with PEP 440, update version identifier in src/PIL/_version.py
  • Run pre-release check via make release-test.
  • Create tag for release e.g.: 
    git tag 5.2.1
git push --tags
  • Create source distributions e.g.: 
    make sdist
  • Create binary distributions
  • Upload all binaries and source distributions e.g. twine upload dist/Pillow-5.2.1*
  • Create a new release on GitHub

Embargoed Release

Released as needed privately to individual vendors for critical security-related bug fixes.

  • Prepare patch for all versions that will get a fix. Test against local installations.
  • Commit against master, cherry pick to affected release branches.
  • Run local test matrix on each release & Python version.
  • Privately send to distros.
  • Run pre-release check via make release-test
  • Amend any commits with the CVE #
  • On release date, tag and push to GitHub. 
    git checkout 2.5.x
git tag 2.5.3
git push origin 2.5.x
git push origin --tags
  • Create source distributions e.g.: 
    make sdist
  • Create binary distributions
  • Create a new release on GitHub

Binary Distributions

Windows

  • Contact @cgohlke for Windows binaries via release ticket e.g. python-pillow#1174.
  • Download and extract tarball from @cgohlke and twine upload *.

Mac and Linux

  • Use the Pillow Wheel Builder: 
    git clone https://github.com/python-pillow/pillow-wheels
cd pillow-wheels
./update-pillow-tag.sh [[release tag]]
  • Download distributions from the Pillow Wheel Builder container. 
    wget -m -A 'Pillow-<VERSION>-*' \
http://a365fff413fe338398b6-1c8a9b3114517dc5fe17b7c3f8c63a43.r19.cf2.rackcdn.com

Publicize Release

Documentation