Setup GPG Signed Key (Mac & Linux)

README.md

First Step

Follow official instruction from this GitLab article : https://gitlab.com/help/user/project/repository/gpg_signed_commits/index.md

Linux

based on my experience, if you're linux user I think that step is enough

Mac

if you get error like this

error: gpg failed to sign the data
fatal: failed to write commit object

then you might follow optional step: Get your signingkey in this way.

brew install gnupg gnupg2 pinentry-mac
git config --global user.signingkey <YOUR_SIGNING_KEY>
git config --global commit.gpgsign true
git config --global gpg.program gpg

Put the following in gpg.conf file (edit file with nano ~/.gnupg/gpg.conf command):

no-tty

Put the following in gpg-agent.conf file (edit file with nano ~/.gnupg/gpg-agent.conf command):

pinentry-program /usr/local/bin/pinentry-mac

You might need to execute killall gpg-agent command after editing the configurations file, gpg.conf, according to the comments. As the self-explanatory command says, this command will terminate the GPG (Gnu Privacy Guard) agent.