Git sign off previous commits?

Question

I was wondering how to sign(-s) off previous commits that I have made in the past in git?

Answer 1

Try this one to redo old commits with a -S:

git filter-branch -f --commit-filter 'git commit-tree -S "$@"' HEAD

After that, you have to git push -f. But be careful, the commit ids will change and other people will become out of sync.