systemd/user/ssh-agent.service

   1 [Unit]
   2 Description=SSH key agent
   3
   4 [Service]
   5 Type=forking
   6 Environment=SSH_AUTH_SOCK=%t/ssh-agent.socket
   7 ExecStart=/usr/bin/ssh-agent -a $SSH_AUTH_SOCK
   8
   9 [Install]
  10 WantedBy=default.target