84.6 Git Branch Rename

20210416 With the change of the default naming of the core branch of a repository to main (by GitHub from 1 October 2020) users can rename their default branch from master to main.

The general command line recipe is primarily done on the local clone. The first step is to move (-m or --move) the master branch to the main branch. Then push the new main branch to the repository setting it as the default for our upstream/origin (-u or --set-upstream). Finally point HEAD to the new branch.

$ git branch -m master main
$ git push -u origin main
$ git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main

Then, connect to GitHub, BitBucket, or GitLab and under Settings/Branches or Advanced select main as the default branch.

Next, back to the command line to delete the master branch:

$ git push origin --delete master

Others who may have the master branch checked out will need to do the following:

$ git checkout master
$ git branch -m master main
$ git fetch
$ git branch --unset-upstream
$ git branch -u origin/main
$ git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main

On GitHub

GitHub in the browser has a little more support for this. Browse to the branches page and click the edit icon. This will allow the name to be changed. Then for the local clone of the repository:

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

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