Don't allow agent reloads, if it's running already.

agent-start

@@ -6,7 +6,17 @@ mkdir -p "$STORE_PATH"
 
 # Start the SSH agent if it isn't already.
 if [ -z "$SSH_AGENT_PID" ]; then
-	eval "$(ssh-agent)" > /dev/null
-	echo "$SSH_AGENT_PID" > "$STORE_PATH"/id
-	echo "$SSH_AUTH_SOCK" > "$STORE_PATH"/sock
+	if [ -f "$STORE_PATH/id" ]; then
+		# Our auth agent is already running.
+		# Reload the vars, and export them.
+		SSH_AGENT_PID=$(cat "$STORE_PATH/id")
+		export SSH_AGENT_PID
+
+		SSH_AUTH_SOCK=$(cat "$STORE_PATH/sock")
+		export SSH_AUTH_SOCK
+	else
+		eval "$(ssh-agent)" > /dev/null
+		echo "$SSH_AGENT_PID" > "$STORE_PATH"/id
+		echo "$SSH_AUTH_SOCK" > "$STORE_PATH"/sock
+	fi
 fi