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VA.gov-CMS Default Branch Rename

Purpose

In an effort to use more inclusive language in technology and recognizing that words have meaning and connotation beyond how they are used technically, VA.gov-CMS repository will change the default branch name from master to the generally accepted main.

Changes to Tugboat Previews

Once the default branch is renamed the master branch will effectively disappear. This will cause the Base Preview built off the master branch to fail.

  1. In Git UI Rename master branch to main
  2. Build Preview from main branch.
  3. Uncheck Base Preview on master
  4. Set Base Preview on main

Considerations:

  • master preview should not be rebuilt as it will fail.
  • Previews that use master as a base can be rebuilt but won't include new changes.
  • New PR Previews will use 'main' as the base.
  • master Preview shouldn't be deleted until all other Previews no longer use it as a base.
  • Deleting 'master' Preview will cause all Previews to grow in size which can be problematic.
  • Previews that use master as a base can be deleted and then built again if they need a rebuild

Pull-Request Previews

The final consideration point above affects existing PR Previews. Since they are based off the master branch base preview they will need to be deleted and recreated. This will ensure that they are based off the newly named main branch base preview.

Demo Environments

Demo environments that require changes from prod will need to be deleted and rebuilt. The major concerns here are:

  • Data that must be persisted in the Demo will need to be backed up.
  • Demo environment URLs will change when they are recreated.

Local Repository Changes for Developers

Once the default branch is renamed, developers will need to update their local repos as well. Below are steps from Github's documentation.

OLD-BRANCH-NAME = master NEW-BRANCH-NAME = main

git branch -m OLD-BRANCH-NAME NEW-BRANCH-NAME
git fetch origin
git branch -u origin/NEW-BRANCH-NAME NEW-BRANCH-NAME
git remote set-head origin -a

You may have noticed that the steps assumed that your remote name is origin. That may or may not be the case for you. In a concrete example, I use the remote name upstream below. You can determine what remote names you use by changing directory to the va.gov-cms repo and entering the below command

git remote -v

The out put may look similar to:

olivereri       git@github.com:olivereri/va.gov-cms (fetch)
olivereri       git@github.com:olivereri/va.gov-cms (push)
upstream        git@github.com:department-of-veterans-affairs/va.gov-cms.git (fetch)
upstream        git@github.com:department-of-veterans-affairs/va.gov-cms.git (push)
upstream-test   git@github.com:department-of-veterans-affairs/va.gov-cms-test.git (fetch)
upstream-test   git@github.com:department-of-veterans-affairs/va.gov-cms-test.git (push)

You can see that my personal fork remote is called olivereri, the va.gov-cms repo remote is called upstream and the va.gov-cms-test repo is called upstream-test. With that in mind these are the commands I would run to update my local:

git branch -m master main
git fetch upstream
git branch -u upstream/main main
git remote set-head upstream -a

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