#! /bin/sh

rm -rf testrepo
git init -b master testrepo
cd testrepo

# Create the first part of the master branch
echo "This is the old master" > README
git add README
git commit -m "Old master"

# Add a PR on top of this beginning of the master branch
git checkout -b pr 
echo "This is the PR" > README
git commit -am "PR"

# Add a commit to make the master branch advance since the PR
git checkout master
echo "Master has advanced" > README
git commit -am "Old master again"

# Create the new main branch from the current state of master
# but with no common history (history rewrite).
git checkout --orphan main master
echo "This is the new main branch" > README
git commit -am "Main"

# Rebase the pr branch from master to main
git rebase -X theirs --onto main master pr