Date: Tue, 15 Dec 1998 13:29:30 -0800 (PST) From: John Polstra <jdp@polstra.com> To: Matthew Dillon <dillon@apollo.backplane.com> Cc: hackers@FreeBSD.ORG Subject: Re: idea/help w. mirroring Message-ID: <XFMail.981215132930.jdp@polstra.com> In-Reply-To: <199812151811.KAA56534@apollo.backplane.com>
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On 15-Dec-98 Matthew Dillon wrote:
> Hmmm. At BEST, we do a sort of stacking. We break the CVS
> tree out into a source tree on a read-only partition. We
> then construct /usr/src by 'layering' it over the read-only
> source tree by reconstructing the directory structure in a
> r+w partition and making each source file a softlink to the
> read-only 'backing store'.
>
> When we need to make a local hack, we break the softlink. When
> we update the underlying source, we diff any broken softlinks
> and fold in changes as appropriate. It aint perfect, but
> it allows us to maintain local hacks while simultaniously
> preventing us from accidently corrupting the source tree.
I'm curious -- have you tried amd's "union" filesystem type? It tries
to automate what you're doing. I've played around with it a little
bit, but haven't attempted to use it on a large scale.
John
---
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Nobody ever went broke underestimating the taste of the American public."
-- H. L. Mencken
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