Using gpg-agent instead of ssh-agent

.bash_gpg-agent

GPG_TTY=$(tty)
export GPG_TTY

if test -f "$HOME/.gpg-agent-info" && \
  kill -0 "$(grep GPG_AGENT_INFO "$HOME/.gpg-agent-info" | cut -d: -f 2)" 2>/dev/null; then
    . "${HOME}/.gpg-agent-info"
    echo "first . ${HOME}/.gpg-agent-info"
    export GPG_AGENT_INFO
    export SSH_AUTH_SOCK
    export SSH_AGENT_PID
else
  eval "$(gpg-agent --daemon --verbose --enable-ssh-support --log-file "${HOME}/.gpg-agent.log" --write-env-file "${HOME}/.gpg-agent-info")"
  . "${HOME}/.gpg-agent-info"
  echo "second . ${HOME}/.gpg-agent-info"
  export GPG_AGENT_INFO
  export SSH_AUTH_SOCK
  export SSH_AGENT_PID
fi