trace-cmd: Read at least 8 bytes trace-id option

When reading the trace-id option from trace.dat file, check if the size
is at least 8 bytes. If the size is greater, use the first 8 bytes only
and ignore the rest. That way we can safely extend this option in the
future, without breaking the legacy logic.

Link: https://lore.kernel.org/linux-trace-devel/20210325064055.539554-24-tz.stoyanov@gmail.com

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
1 file changed