Date: Tue, 6 Dec 2005 08:13:30 +0300 From: Yar Tikhiy <yar@comp.chem.msu.su> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: Ion-Mihai Tetcu <itetcu@people.tecnik93.com>, ports@freebsd.org, freebsd-rc@freebsd.org Subject: Re: RC keywords question Message-ID: <20051206051329.GA30433@comp.chem.msu.su> In-Reply-To: <20051205220053.GB24743@odin.ac.hmc.edu> References: <20051205145805.0db6cf26@it.buh.tecnik93.com> <20051205161656.GC7653@odin.ac.hmc.edu> <20051205171416.GA88485@comp.chem.msu.su> <20051205220053.GB24743@odin.ac.hmc.edu>
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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
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