Setting up GPG signature on macOS with Xcode

gpg-with-key

/usr/local/bin/gpg --batch --pinentry-mode=loopback --passphrase-file ~/.gnupg/key.txt --no-tty "$@"

setup_gpg.sh

# Install gpg
brew install gpg

# Generating and exporting
gpg --gen-key
gpg --armor --export <email> > ~/.backups/gpg_git_public.key
gpg --armor --export-secret-key <email> > ~/.backups/gpg_git_private.key
chmod 600 ~/.backups/gpg_git_public.key
chomd 600 ~/.backups/gpg_git_private.key

# Importing
gpg --armor --import ~/.backups/gpg_git_private.key
gpg --list-secret-keys

# Copy the 8-digit id of the key (in the `sec` section)
git config --global user.signingkey <8-digit key id>
git config --global commit.gpgsign true

# Put the passpharse for the GPG key to the first line of the file
vi ~/.gnupg/key.txt
chmod 600 ~/.gnupg/key.txt

# Add lines from the gpg-with-key file of this gist
vi /usr/local/bin/gpg-with-key
chmod 755 /usr/local/bin/gpg-with-key

# Set the gpg program used by git
git config --global gpg.program "/usr/local/bin/gpg-with-key"