[lttng-dev] What is the point of the lttng --group option?

[Thibault, Daniel]

   In order for a user-level (non-sudoed) lttng command to be handled by the root lttng-sessiond daemon, the stars have to be properly aligned:

* The root daemon has to be running
* There must not be an lttng-sessiond daemon running for that user (other users' lttng-sessiond daemons are ignored)
* The user must belong to the root daemon's group name ('tracing' unless the lttng-sessiond --group option was used to set it to something else)

   Otherwise the user-level lttng command is handled by the user's local lttng-sessiond daemon (which is spawned if not already running).

   Specifying the lttng --group makes no difference.  Whether you belong to it or not, the success of your non-sudoed root daemon command is decided by the three bullets listed above.

   So what is this option supposed to be used for?
 
Daniel U. Thibault
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