illumos gate

It is possible to use -o with dtrace -A so that it writes the generated DOF to an alternative file, rather than updating /kernel/drv/dtrace.conf on the running system.
However, even with this option present, dtrace will modify /etc/system. This seems wrong.

Here is the default behaviour, without -o, where dtrace updates the two system files:

% pfexec dtrace -A -s anon.d
dtrace: saved anonymous enabling in /kernel/drv/dtrace.conf
dtrace: added forceload directives to /etc/system
dtrace: run update_drv(8) or reboot to enable changes

and here is what happens if the -o option is also provided:

% pfexec dtrace -A -s anon.d -o anon.out
dtrace: saved anonymous enabling in anon.out
dtrace: added forceload directives to /etc/system            <------ still modifies /etc/system
dtrace: run update_drv(8) or reboot to enable changes

I propose that if the -o option is provided, then /etc/system is left alone, and the message regarding update_drv is also unecessary.