Master to Main

This is a simple bash script that makes changing your Github default branch from "master" to "main" as simple as possible.

Installation

cp mastertomain.sh /usr/local/bin/mastertomain

Usage

cd into the root directory of any Git repository whose default branch you want to change. The run:

mastertomain

mastertomain assumes your git remote is named "origin", but accepts one optional argument if your remote is not named origin. For example, if your remote is named "upstream", you would run mastertomain upstream.

You should see the following output:

Already on 'master'
Warning: Permanently added the RSA host key for IP address '140.82.114.3' to the list of known hosts.
From github.com:agocs/fullwidth
 * branch            master     -> FETCH_HEAD
 * [new branch]      master     -> origin/master
Already up to date.
Switched to a new branch 'main'
Warning: Permanently added the RSA host key for IP address '140.82.113.3' to the list of known hosts.
Total 0 (delta 0), reused 0 (delta 0)
remote:
remote: Create a pull request for 'main' on GitHub by visiting:
remote:      https://github.com/agocs/fullwidth/pull/new/main
remote:
To github.com:agocs/fullwidth.git
 * [new branch]      main -> main
OK! The main branch has been pushed to your remote. Click on the following link to set it to the default branch!

>>>>> https://github.com/agocs/fullwidth/settings/branches

Once you've done that, I'll clean up here by running the following commands:
  - git branch -d master
  - git push -d origin master
  - git remote set-head origin main

If you'd like to continue, press y. Otherwise, press any other key.
Continue? [y/N]

Now click the link into Github and change your default branch! If everything looks good, press y (and then press enter), and the script will clean up for you.

If you'd like to continue, press y. Otherwise, press any other key.
Continue? [y/N] y
OK, cleaning up!
Deleted branch master (was 62e9a23).
To github.com:agocs/fullwidth.git
 - [deleted]         master

Something's gone wrong!

If something's messed up, no need to worry! If you haven't changed your default branch, you can undo these changes by:

git branch -d main
git push -d origin main #replace "origin" with the name of your remote if necessary

This will remove the main branch both locally and remotely, so you can make whatever changes you need to make to your master before re-running the script.