ssh-agent.sh

SSH_ENV="$HOME/.ssh/environment"

# start the ssh-agent
function start_agent {
	echo "Initializing new SSH agent..."
	# spawn ssh-agent
	ssh-agent | sed 's/^echo/#echo/' > "$SSH_ENV"
	chmod 600 "$SSH_ENV"
	. "$SSH_ENV" > /dev/null
	ssh-add
}

# test for identities
function test_identities {
	ssh-add -l > /dev/null
	if [ $? -eq 2 ]; then
		start_agent
	fi

	# test whether standard identities have been added to the agent already
	ssh-add -l | grep "The agent has no identities" > /dev/null
	if [ $? -eq 0 ]; then
		ssh-add
		# $SSH_AUTH_SOCK broken so we start a new proper agent
		if [ $? -eq 2 ]; then
			start_agent
		fi
	fi
}

# check for running ssh-agent with proper $SSH_AGENT_PID
if [ -n "$SSH_AGENT_PID" ]; then
	ps -ef | grep "$SSH_AGENT_PID" | grep ssh-agent > /dev/null
	if [ $? -eq 0 ]; then
		test_identities
	fi
# if $SSH_AGENT_PID is not properly set, we might be able to load one from
# $SSH_ENV
else
	if [ -f "$SSH_ENV" ]; then
		. "$SSH_ENV" #> /dev/null
	fi
	ps -ef | grep "$SSH_AGENT_PID" | grep ssh-agent > /dev/null
	if [ $? -eq 0 ]; then
		test_identities
	else
		start_agent
	fi
fi