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Date:      Mon, 26 Mar 2001 18:14:43 +1000
From:      "Andrew Reilly" <areilly@bigpond.net.au>
To:        Jack Rusher <jar@integratus.com>
Cc:        Jordan Hubbard <jkh@osd.bsdi.com>, jonathan@graehl.org, freebsd-arch@FreeBSD.ORG
Subject:   Re: configuration files, XML, Mac OS X release
Message-ID:  <20010326181443.A75840@gurney.reilly.home>
In-Reply-To: <3ABEB519.CA9F1029@integratus.com>; from jar@integratus.com on Sun, Mar 25, 2001 at 07:18:49PM -0800
References:  <NCBBLOALCKKINBNNEDDLMEBODNAA.jonathan@graehl.org> <20010325170513Z.jkh@osd.bsdi.com> <3ABEB519.CA9F1029@integratus.com>

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On Sun, Mar 25, 2001 at 07:18:49PM -0800, Jack Rusher wrote:
> Jordan Hubbard wrote:
> > 
> > The project has a Mac (eatmorepie.freebsd.org) running the OS X
> > release candidate, though it appears to be down at the moment (I'll
> > fix that).  Someone can certainly log into it at some point and
> > look this stuff over.
> 
>   I took a look at the release during the big pre release party at
> Apple.  It looks like the only XML DTD they have in the system is a
> property list DTD designed to allow them to store groups of key/value
> pairs as the backing store for application configuration data.
> 
>   I remain willing to help integrate a lightweight BSD license XML based
> configuration management system into FreeBSD.  Does anybody really want
> such a beast?

I really like the idea of a uniform and configurator-friendly
config management system.  I'm not crazy about XML, but my
opinion on the subject hardly matters.

However, it occurred to me a while back that there is no need to
do this all at once, and probably many good reasons not to.  I'd
suggest that an approach might be:

1) Dermine a C API for access to the (XML?) config files.
2) Build a library that implements that API.
3) Convert the ad-hoc config file mechanisms in each application
   to use the library as well or instead.

It sounds as though you have (1) and (2) sorted out.  (3) is the
biggie, but as I mentioned above: it doesn't have to happen all
at once.  None of the existing applications share config
formats, or rely on common mechanisms, so changing them one at a
time will have the positive effect of allowing for the necessary
user education process to be gradual.  It also gives more room
for gradual refinement of the API (1) to accommodate different
functionality.

Once there's a config API and implementation, it should be an
easy (or easier) matter to replace or modify the library to
include other forms of config store, such as LDAP databases or
netinfo servers or whatever.

Note too that (at least with a text (XML) style config store)
all of this can be done without the pre-existence of a universal
configurator tool, which history has shown to be a difficult and
complicated beast.

-- 
Andrew

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