Update author and email in git history

Imagine you have already made some commits in a git repo and you want to update your mail address and/or your name ? In short, you want to re-write git history with good informations.

Here is a script who can do that. Put here in parent folder of git repo you want to edit:

#!/bin/sh

git filter-branch --env-filter '
OLD_EMAIL="incorrect-email@domain.tld"
CORRECT_NAME="Your Name"
CORRECT_EMAIL="good-email@domain.tld"
if [ "$GIT_COMMITTER_EMAIL" = "$OLD_EMAIL" ]
then
  export GIT_COMMITTER_NAME="$CORRECT_NAME"
  export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
fi
if [ "$GIT_AUTHOR_EMAIL" = "$OLD_EMAIL" ]
then
  export GIT_AUTHOR_NAME="$CORRECT_NAME"
  export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
fi
' --tag-name-filter cat -- --branches --tags

This script will search for all commits done by incorrect-email@domain.tld and replace them by correct name and mail.

From the repo you want to edit, you can launch the script like this:

/bin/sh ../script.sh

You can now force push to re-write the history !

git push --force