Bulk-change the default branch for all your GitHub repos at once, from master to main (or another new default you choose).

Usage:

pip3 install -r requirements.txt
python3 run.py GITHUB_OWNER GITHUB_TOKEN [NEW_DEFAULT_BRANCH=main]

GITHUB_OWNER is your username, unless you want to change repos under an organization (in which case you should use the org name).

Get a token from your account settings. Make sure it has full repo permissions.

By default, the script ignores:

• Forks
• Archived repositories
• Repos where the default branch is already non-standard (e.g. development).
• Repos ending in .github.io, because GitHub Pages has hardcoded branch names.

Side effects:

• Existing clones will need to be updated, with git fetch && git checkout NEW_DEFAULT_BRANCH.
• Open pull requests to the old branch will be closed.
• Branch protection rules, CIs, and other systems that exclicitly reference the old branch by name may need to be updated seperately.
• You may get @dependabot PRs on repos that haven't been updated recently and have outdated pinned dependencies.