#GPG Agent & Yubikey
#assuming you're using Ubuntu and ZSH

#Install the packages
sudo apt install gnupg2 gnupg-agent scdaemon pcscd

#write the necessary config
echo "enable-ssh-support" >> ${HOME}/.gnupg/gpg-agent.conf

#Update zshrc
cat <<EOF >> "${HOME}/.zshrc"
#Making sure we're using gpg2
alias gpg=gpg2

# Start the gpg-agent if not already running
if ! pgrep -x -u "${USER}" gpg-agent >/dev/null 2>&1; then
        gpg-connect-agent /bye >/dev/null 2>&1
fi

# Set SSH to use gpg-agent
unset SSH_AGENT_PID
if [ "${gnupg_SSH_AUTH_SOCK_by:-0}" -ne $$ ]; then
        export SSH_AUTH_SOCK="${HOME}/.gnupg/S.gpg-agent.ssh"
fi

# Set GPG TTY
export GPG_TTY=$(tty)

# Refresh gpg-agent tty in case user switches into an X session
gpg-connect-agent updatestartuptty /bye >/dev/null
EOF

source "${HOME}/.zshrc"