Telepathy debugging

Enabling debug logs for Telepathy

When there are certain kinds of problems with collaboration on the XO, it is useful to developers to have log files for debugging purposes. Here is how to enable these log files. If you haven't already seen Attaching Sugar Logs to Tickets, see that page first.

• Enable your /home/olpc/.xsession file

 cp /home/olpc/.xsession-example /home/olpc/.xsession

• Edit .xsession and uncomment the lines about GABBLE_DEBUG, GABBLE_LOGFILE, SALUT_DEBUG and SALUT_LOGFILE by removing the initial '#' character
• For debugging lower level problems in the Telepathy connection managers, enable LM_DEBUG (for telepathy-gabble) or GIBBER_DEBUG (for telepathy-salut). Note that these will produce much bigger log files.
• Reboot

Telepathy log files are now available at /home/olpc/.sugar/default/logs/telepathy-gabble.log and /home/olpc/.sugar/default/logs/telepathy-salut.log . Be sure to attach these files if you submit a ticket about a Telepathy issue.

Capturing core files

Core files are produced when a program crashes and contain useful debugging information. By default, core files are disabled on the XO. Here is how to enable them.

• As root:

 echo /tmp/core-%p-%e > /proc/sys/kernel/core_pattern

This tells the kernel to put core files into the /tmp directory. This will only be effective until the laptop is rebooted. To make it persistent across reboots, add the following line to /etc/sysctl.conf:

 kernel.core_pattern = /tmp/core-%p-%e

• Add the following line to /home/olpc/.xsession:

 ulimit -c unlimited

This turns off any limit on core file size.