openssh-dotconfig-aur/ssh-agent.service

# Requires SSH_AUTH_SOCK="$XDG_RUNTIME_DIR/ssh-agent.socket" to be set in environment
[Unit]
ConditionEnvironment=!SSH_AGENT_PID
Description=OpenSSH key agent
Documentation=man:ssh-agent(1) man:ssh-add(1) man:ssh(1)

[Service]
Environment=SSH_AUTH_SOCK=%t/ssh-agent.socket
ExecStart=/usr/bin/ssh-agent -D -a $SSH_AUTH_SOCK
PassEnvironment=SSH_AGENT_PID
SuccessExitStatus=2
Type=simple

[Install]
WantedBy=default.target