Overflow ROS logs in ".ros" dir

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rospy uses the python logging module underneath and so all your customizations can just be added to the python logger object directly. To get this level of customization for how the log files are written, you should write your own log handler that would probably inherit from the FileHandler class.

Your code would look something like this:

#!/usr/bin/env python

import rospy
import logging

rospy.init_node('log_test')

logger = logging.getLogger("rosout")

class CustomFileHandler(logging.FileHandler):
    def emit(self, record):
        # handle logging records, I would check the python documentation linked above
    def close(self):
        # close the file

logger.addHandler(CustomFileHandler('path/to/file.log'))