[lttng-dev] Dead code in lttng.c

[Thibault, Daniel]

In lttng-tools/src/bin/lttng/lttng.c, the check_args_no_sessiond function checks the command-line arguments for "specific options and commands that must not trigger a session daemon". The function detects the options "-h", "--h" (for "--help"), "--list-options", and "--list-commands", and the commands "version" and "view".

The parse_args function, on the other hand, detects "-V", "-h", "--list-commands", "--list-options" at its outset and *does not* reach the session daemon spawning check ( if (opt_no_sessiond == 0 && check_args_no_sessiond(argc, argv) == 0 && (check_sessiond() < 0)) ) in those cases.

So, why is check_args_no_sessiond checking for options at all?  Considering the control flow of parse_args, check_args_no_sessiond should check *only* for the "version" and "view" commands.

If check_args_no_sessiond is to check the command-line options anyway (for completeness's sake, say), then it should check for the "-V"/"--version" option as well.  And if the check for "--h" is satisfactory, the check for "--list-commands" and "--list-options" should be collapsed into a simple check for "--l".

(These observations are based on the May 23 commit, so my apologies if these points have already been addressed)

Daniel U. Thibault
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