Setup ssh agent automatically on login

ssh-agent-setup

# ssh agent setup

SSH_ENV=$HOME/.ssh/env

start_ssh_agent() {
        ssh-agent > $SSH_ENV
        . $SSH_ENV
}

check_ssh_agent() {
        . $SSH_ENV && test "$SSH_AGENT_PID" && ps -p $SSH_AGENT_PID >/dev/null
}

check_ssh_identity() {
        ssh-add -L >/dev/null
}

add_ssh_identity() {
        ssh-add
}

ssh_agent_setup() {
        check_ssh_agent || start_ssh_agent && check_ssh_identity || add_ssh_identity
}

ssh_agent_setup