Renaming master to main everywhere

migrate_branches is a small Bash script I wrote to ease the move from master to main on GitHub. It uses the GitHub REST API to find the repositories still using the old branch name and renames it in each one.

For every repository your token can see that belongs to OWNER, isn’t archived, and still has the source branch as its default, it calls GitHub’s branch rename endpoint. Renaming through the API means GitHub also:

updates the default branch
shows users a notice about the name change
updates GitHub Pages setups that were based on the old branch

Usage, from the README:

GITHUB_TOKEN=xxxx \
OWNER=Jell \
SOURCE_BRANCH=master \
TARGET_BRANCH=main \
./migrate_branches.sh

Source on GitHub: ReifyAB/migrate_branches