remote roslaunch log files location

Question

I am running ROS Indigo in an Ubuntu 14.04 machine.

When launching a remote roslaunch on a robot as the following (some ommited parts are not relevant to the question) :

<launch>
<machine name="$(arg name)" address="$(arg robot_ip)" env-loader="~/catkin_ws/src/setup_env.bash" 
    user="wifibot" password="****" timeout="10.0" default="never"/>

<node machine="$(arg name)" name="$(arg name)" pkg="wifibot" type="wifibot_controller" output="log">
    <param name="id" value="$(arg id)" />
    <param name="vl" value="$(arg vl)" />
    <param name="va" value="$(arg va)" />
    <param name="name" value="$(arg name)" />
</node> 
<launch/>

everything works Ok, but when it comes to end, I couldn't find the remote roslaunch log files in both .ros/log/ folders.

I searched both in my local and remote machines with no clues.

Does someone have a hint ?

Cheers,