RC keywords question

[Yar Tikhiy]

On Mon, Dec 05, 2005 at 02:00:53PM -0800, Brooks Davis wrote:
> On Mon, Dec 05, 2005 at 08:14:16PM +0300, Yar Tikhiy wrote:
> > Just an additional remark:
> > 
> > In a system with complex interactions it can be hard to order rc.d
> > scripts properly without help from services they start.  For instance,
> > the database can REQURE "mail".  Then either the mail daemon should
> > spool mail until dspam starts after the database, or dspam should
> > start early and return a temporary failure condition to the mail
> > daemon until it can connect to the database.  Similar considerations
> > apply to other practical cases.
> 
> Loops are definitely something to be watched out for, but this one is
> a somewhat poor example, IMO.  Looking at the "mail" scripts in the
> base, it's clear that they are intended to provide the local delivery
> agent.  If the particular mail system needs daemons running for local
> mail submission to work, those daemons must start much earlier (probably
> BEFORE: SERVERS).

Have you ever met lame software trying to send mail about its
condition directly by SMTP to a pre-set local relay?  So a database
engine can, in theory, requre "mail".  Of course, I won't advise
using such a bogus DB engine, but my example isn't too poor either ;-)

-- 
Yar