Git rebase to fix up author information on commits

rebase.sh

# Git rebase is a weird 3-way thing that compares local commits to upstream commits.
# Yes really. So if you just want to edit some local commits, you need an upstream
# branch with exactly the same commits on it, to avoid git doing weird stuff.
# There doesn't seem to be any "local only" option in git rebase.
git config user.name 'Full Name'
git config user.email 'person@example.com'
git branch temp-1
# this is the critical step:
git push -u origin temp-1
# git rebase -i --root --exec "git commit --amend --reset-author --no-edit"
# the following preserves all commit and author timestamps!
git -c rebase.instructionFormat='%s%nexec GIT_COMMITTER_DATE="%cD" GIT_AUTHOR_DATE="%aD" git commit --amend --no-edit --reset-author' rebase --root
git push -f origin temp-1
# in my case I wanted to fix up main:
git push -f origin main
git fetch --all
git branch --delete temp-1
git push origin --delete temp-1
git gc