Improving halt package interaction...

[Thomas M Steenholdt]

Bill Nottingham wrote:
> 
> What's needed here that can't just be done with a 'normal' script
> that runs in runlevel 0/6?
> 

Other than what the other guys have mentioned, like perhaps making it 
possible to run scripts after ro remounting "/", a delayed UPS poweroff 
from a normal initscript is less precise, since you have no reliable 
measure of how long the system will take to power down (perhaps you're 
running large databases?). You could end up powering off the UPS outlets 
before the system is ready for it. Or specifying a long delay, the 
system might need to wait for far too long for the system to restart, 
even though power returned during the shutdown. It would be much better 
to call the UPS poweroff command as the very last thing with a 5-10 
second delay, just before the system halts, rather than having to 
specify a 5 minute delay for an initscript based solution. It's more of 
a "hook" based approach, which IMO is better for this.

/Thomas