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

[Martin Schlemmer]

On Tue, 2003-05-06 at 21:59, Wout Mertens wrote:

> 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.
>

So in the network context:

-------- add to /etc/conf.d/net ---------
modules_eth0="static route firewall"
-----------------------------------------

-------- add to /etc/init.d/net.eth? ----
depend() {
    subscribe after ${modules_eth0}
}
-----------------------------------------

and if net.eth0 starts (meaning the interface is present for example),
it will run the 'static' module to set the static ip, then do the
routes, and lastly add firewall/whatever rules.  Same in reverse if
its stopped.

Note that above might be too simplified, and out of context.

This brings up a question or two:

1)  should this work for all rc-scripts, or should we maybe
    add a /etc/init.d/modules/ that have very job specific
    scripts that are related to net.* (net.eth?, net.ppp?, net.foo)

2)  if yes to 1), will we need it for anything else than net.* stuff ?

3)  you mentioned a few events ... do we really need them all, or could
    we get away with a 'start/stop' only ?

To get it running, is not the issue.  The bigger issue is getting it
functional, without too much bloat/speed decrease/complexity, with
a stable API that do not have to change every few months.  Basically
we will need to think what exactly is needed, and will be needed.


-- 

Martin Schlemmer
Gentoo Linux Developer, Desktop/System Team Developer
Cape Town, South Africa