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Pantheon release process documentation

There are some atypical development and release procedures in use with this repository:

  1. The currently released version of this repository lives in parallel in the main branche of pantheon-upstreams/wordpress-composer-managed.
    pantheon-upstreams/wordpress-composer-managed closely mirrors the development repository at pantheon-systems/wordpress-composer-managed and is automatically updated by a CircleCI process.
  2. Changes are made by submitting a PR against the default branch of pantheon-systems/wordpress-composer-managed.
  3. Merging a PR to default does not create a new release of pantheon-upstreams/wordpress-composer-managed. This allows us to batch more than one relatively small change into a single new "release" such that the number of separate update events appearing on customer dashboards is more controlled.

Differences between pantheon-upstreams and pantheon-systems repos:

  1. Commits modifying the .circleci directory, devops directory or this file are omitted from pantheon-upstreams. This prevents downstream Pantheon sites from being littered with our internal CI configuration, and allows us to enhance CI without generating irrelevant site updates. However, it means you must not create commits that modify both .circleci and other files in the same commit.
  2. Commit authors are rewritten to Pantheon Automation <bot@getpantheon.com> as a request from Product. The author names appear on the dashboard and this creates a more professional presentation.

Cutting a new release

  1. Update CHANGELOG.md. In the past, the copy has been created in consultation with the product owner.
  2. Ensure the commit message for the last commit in this release says what we want to have appearing on the dashboard as an available update. See CORE-2258 for the inaugural example of such a commit message. All changes are committed to pantheon-upstreams as a single commit, and the message that is used for it is the one from the last commit.
    • Typically the CHANGELOG.md commit is the last one and so is the one whose commit message should be wordsmithed.
  3. Trigger the new release to pantheon-upstreams by --ff-only-merging default into release and pushing the result: 
    git fetch
git checkout release && git pull
git merge --ff-only origin/default
git push origin release
    A CircleCI job causes the release to be created.

Branch protections and their rationale

In pantheon-systems

  1. The default branch does not accept merge commits. This is because this branch serves as the staging area for commits queued to be released to site upstreams, and the commit messages appear on customer dashboards as available updates. Preventing Merged "[CORE-1234] Added widget to branch default [#62]"-style commit messages enhances the user experience.

In pantheon-upstreams

  1. All branches do not accept pushes, except by GitHub user pantheon-circleci and owners of the pantheon-upstreams organization, because GitHub hardcodes those users as able to push. This is just to avoid accidental direct pushes, because commits to the upstreams repo are supposed to be made only from CircleCI as part of an intentional release with the commit authors rewritten.