From owner-freebsd-hackers  Mon Feb  1 21:11:53 1999
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From: Kevin Day <toasty@home.dragondata.com>
Message-Id: <199902020511.XAA29187@home.dragondata.com>
Subject: Re: 'cpdup' program, and question
In-Reply-To: <XFMail.990201210330.jdp@polstra.com> from John Polstra at "Feb 1, 1999  9: 3:30 pm"
To: jdp@polstra.com (John Polstra)
Date: Mon, 1 Feb 1999 23:11:39 -0600 (CST)
Cc: spork@super-g.com, hackers@FreeBSD.ORG
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> 
> spork wrote:
> > On Thu, 28 Jan 1999, John Polstra wrote:
> > 
> >> At least one commercial company employs CVSup to do field upgrades
> >> of their FreeBSD-based product.  In that application, CVSup upgrades
> >> the entire root and /usr filesystems.
> > 
> > Have you seen any example-laden FAQs on something like this?  You've
> > piqued my curiousity...
> 
> I don't know the full details of how they've done it.  But my
> understanding is that they've simply made one or two big collections
> representing the filesystems.  CVSup takes great pains to update all
> files atomically, so it normally wouldn't cause problems to upgrade a
> running system.  Obviously you have to carefully think through all the
> "what ifs", and be prepared to recover from them.
> 
> John

I'm also thinking about using cvsup for field updates in an embedded
product. (either by modem, or by cd)... If anyone has anything to share, i'd
love to hear too. :)


Kevin

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