Re: [gentoo-dev] rc-scripts/init: new service dependency

[Wout Mertens]

On Tue, 6 May 2003, Martin Schlemmer wrote:

> On Tue, 2003-05-06 at 11:40, Wout Mertens wrote:
>
> > How about subscribe? And you can ask to be called before and/or after the
> > script you subscribe to:
> >
> > subscribe after net.ppp0
> >
> > event() {
> > 	case $2 in
> > 		start|restart)
> > 			start
> > 			;;
> > 		stop)
> > 			stop
> > 			;;
> > 	esac
> > }
> >
> > This would make runscript call ddclients event() after net.ppp0 was run,
> > with $1 set to the script, $2 set to the action and $3 set to before or
> > after.
> >
>
> Well, if you need to start something before, you can just use 'use', or
> 'before/after'.
>
> I think what he wants, and what will be a unique addition, is being able
> to tell a script:  If you start successfully, start 'foobar'

That's what I meant: when the service is called for an action (start,
stop, restart, reload, custom things), runscript will run the event()
function for all the scripts that are subscribed to that script, and then
those scripts can figure out what to do with it themselves...

And the gentoo-net scripts that I am working on will go down a
user-configurable list when certain things happen. (interface up/down, ip
address changed, etc.

The design pattern we're looking at here is events and interested parties,
and it's just a matter of defining what events we handle and how we notify
the parties.

Wout.

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