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Releasing

This document describes our release process, and contains the steps to be followed by an OpenZeppelin maintainer at the several stages of a release.

We release a new version of OpenZeppelin monthly. Release cycles are tracked in the issue milestones.

Each release has at least one release candidate published first, intended for community review and any critical fixes that may come out of it. At the moment we leave 1 week between the first release candidate and the final release.

Before starting make sure to verify the following items.

  • Your local master branch is in sync with your upstream remote (it may have another name depending on your setup).
  • Your repo is clean, particularly with no untracked files in the contracts and tests directories. Verify with git clean -n.

Creating the release branch

We'll refer to a release vX.Y.Z.

git checkout master
git checkout -b release-vX.Y.Z

Creating a release candidate

Once in the release branch, change the version string in package.json, package-lock.json and ethpm.json to X.Y.Z-rc.R. (This will be X.Y.Z-rc.1 for the first release candidate.) Commit these changes and tag the commit as vX.Y.Z-rc.R.

git add package.json package-lock.json ethpm.json
git commit -m "Release candidate vX.Y.Z-rc.R"
git tag -a vX.Y.Z-rc.R
git push upstream release-vX.Y.Z
git push upstream vX.Y.Z-rc.R

Draft the release notes in our GitHub releases. Make sure to mark it as a pre-release! Try to be consistent with our previous release notes in the title and format of the text. Release candidates don't need a detailed changelog, but make sure to include a link to GitHub's compare page.

Before publishing on npm you need to generate the build artifacts. This is not done automatically at the moment because of a bug in Truffle. Since some of the contracts should not be included in the package, this is a hairy process that you need to do with care.

  1. Delete the contracts/mocks, contracts/examples and build directories.
  2. Run truffle compile. (Note that the Truffle process may never exit and you will have to interrupt it.)
  3. Recover the directories using git checkout. It doesn't matter if you do this now or later.

Once the CI run for the new tag is green, publish on npm under the next tag.

npm publish --tag next

Publish the release notes on GitHub and ask our community manager to announce the release candidate on at least Slack and Twitter.

Creating the final release

Make sure to have the latest changes from upstream in your local release branch.

git checkout release-vX.Y.Z
git pull upstream

Change the version string in package.json, package-lock.json and ethpm.json removing the "-rc.R" suffix. Commit these changes and tag the commit as vX.Y.Z.

git add package.json package-lock.json ethpm.json
git commit -m "Release vX.Y.Z"
git tag -a vX.Y.Z
git push upstream vX.Y.Z

Draft the release notes in GitHub releases. Try to be consistent with our previous release notes in the title and format of the text. Make sure to include a detailed changelog.

Before publishing on npm you need to generate the build artifacts. This is not done automatically at the moment because of a bug in Truffle. Since some of the contracts should not be included in the package, this is a hairy process that you need to do with care.

  1. Delete the contracts/mocks, contracts/examples and build directories.
  2. Run truffle compile. (Note that the Truffle process may never exit and you will have to interrupt it.)
  3. Recover the directories using git checkout. It doesn't matter if you do this now or later.

Once the CI run for the new tag is green, publish on npm.

npm publish

Publish the release notes on GitHub and ask our community manager to announce the release!

Delete the next tag in the npm package as there is no longer a release candidate.

npm dist-tag rm --otp $2FA_CODE openzeppelin-solidity next

Merging the release branch

After the final release, the release branch should be merged back into master. This merge must not be squashed because it would lose the tagged release commit. Since the GitHub repo is set up to only allow squashed merges, the merge should be done locally and pushed.

Make sure to have the latest changes from upstream in your local release branch.

git checkout release-vX.Y.Z
git pull upstream

git checkout master
git merge --no-ff release-vX.Y.Z
git push upstream master

The release branch can then be deleted on GitHub.