1. Change name and email using git-filter-repo
1.1 git-filter-repo installation
Ref: https://github.com/newren/git-filter-repo/blob/main/INSTALL.md
Install via pip
Although it is officially recommended to install it using package manager, my apt couldn’t find the package, so I decided to install it through pip, the not recommended method
$ pip install git-filter-repo
Add it to $PATH
Ref: https://linuxize.com/post/how-to-add-directory-to-path-in-linux/
Installing the package via pip does not place it in the $PATH, so I have to manually add the installation directory, which is ‘~/.local/bin’, to $PATH.
Append this line to .bashrc:
# add ~/.local/bin to PATH due to git-filter-repo
export PATH="$HOME/.local/bin/:$PATH"
To load the new configuration, run:
$ source ~/.bashrc
Verify installation
Check if it is installed successfully by running:
$ git filter-repo -h
1.2 Change author name and email
Ref: https://www.gloomycorner.com/changing-author-info-in-existing-git-commits/
Make a fresh clone of the target repo, then write a mailmap file in which the author’s name and email are specified in the following format:
Your Name <correct@email.com> <old@email.com>
For example:
john <john@noreply.email.com> <john@gmail.com>
Then save it as, say for example, my-mailmap.
To perform filter-repo, cd into the repository and run:
$ git filter-repo --mailmap ../my-mailmap
2. Sign all the commits using git filter-branch
Ref https://gist.github.com/poqdavid/2509214dd9132f6ec77685673baea4de#file-howto-md
Ref https://stackoverflow.com/questions/41882919/is-there-a-way-to-gpg-sign-all-previous-commits
Ref https://github.com/newren/git-filter-repo/discussions/209#discussioncomment-2294772
2.1 Sign all commits
$ git filter-branch -f --commit-filter 'git commit-tree -S "$@";' -- --all
2.2 Delete all backups/dupes made by filter-branch
$ git for-each-ref --format="%(refname)" refs/original/ | xargs -n 1 git update-ref -d
$ git reflog expire --expire=now --all
$ git gc --prune=now