Change the commit author name and email of all matching commits in a repository (e.g., for replacing outdated email addresses)

change-commit-author.sh

#!/bin/sh
# DON'T DO THIS, IF OTHER PEOPLE WORK ON YOUR REPO!
set -e

# TODO update these variables
REPO_TO_UPDATE='https://github.com/robin-hartmann/robin-hartmann'
WORKSPACE_FOLDER='workspace-change-commit-author'

git clone --bare $REPO_TO_UPDATE $WORKSPACE_FOLDER
cd $WORKSPACE_FOLDER

export FILTER_BRANCH_SQUELCH_WARNING=1

git filter-branch --env-filter '

# TODO update these variables
CORRECT_NAME="Robin Hartmann"
CORRECT_EMAIL="contact@robin-hartmann.com"

COMMITS_TO_SKIP=(
)

EMAILS_TO_REPLACE=(
    old.name@old-domain.de
    contact.old.name@old.domain.com
)

if [[ ! "${COMMITS_TO_SKIP[@]}" =~ "$GIT_COMMIT" ]]; then
    if [[ "${EMAILS_TO_REPLACE[@]}" =~ "$GIT_COMMITTER_EMAIL" ]]; then
        export GIT_COMMITTER_NAME="$CORRECT_NAME"
        export GIT_COMMITTER_EMAIL="$CORRECT_EMAIL"
    fi
    if [[ "${EMAILS_TO_REPLACE[@]}" =~ "$GIT_AUTHOR_EMAIL" ]]; then
        export GIT_AUTHOR_NAME="$CORRECT_NAME"
        export GIT_AUTHOR_EMAIL="$CORRECT_EMAIL"
    fi
fi

' --tag-name-filter cat -- --branches --tags

git push --force --tags origin 'refs/heads/*'
cd ..
rm -rf $WORKSPACE_FOLDER