.sh_ssh_agent.sh

gistfile1.txt

# Note: ~/.ssh/environment should not be used, as it 
#      already has a different pururpose in SSH

env=~/.ssh/agent.env

# Note: Don't bother checking SSH_AGENT_PID. It's not used
#       by SSH itself, and it might even be incorrect
#       (for example, when using agent-forwarding over SSH).

agent_is_running() {
    if [ "$SSH_AUTH_SOCK" ]; then
        # ssh-add returns:
        #   0 = agent running, has keys
        #   1 = agent running, no keys
        #   2 = agent not running
        ssh-add -l >/dev/null 2>&1 || [ $? -eq 1 ]
    else
        false
    fi
}

agent_load_env() {
    . "$env" >/dev/null
}

agent_start() {
    (umask 077; ssh-agent >"$env")
    . "$env" >/dev/null
}

agent_has_keys() {
    ssh-add -l >/dev/null 2>&1
}

agent_has_key() {
    if [ "$1" ]; then
      echo "looking for: $1"
      ssh-add -l | grep "$1" >/dev/null 2>&1
    else
      false
    fi
}

if ! agent_is_running; then
    agent_load_env
    agent_start
fi

if ! agent_has_keys; then
    ssh-add ~/.ssh/id_rsa
    ssh-add ~/.ssh/id_rsa_2
    ssh-add ~/.ssh/id_rsa_3
    clear
fi

unset env