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Date: Sat, 17 Nov 2007 17:05:20 +0100
From: Jan Henrik Sylvester <me@janh.de>
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To: Colin Percival <cperciva@freebsd.org>
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Cc: stable-list freebsd <freebsd-stable@freebsd.org>
Subject: Re: freebsd-update 6.2-R -> 6.3-B1 rollback failed
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Colin Percival wrote:
> Depending on the UpdateIfUnmodified option in freebsd-update.conf, it will
> either update files to "clean" new versions or print a warning message and
> not touch them.
> 
> There's also an IgnorePaths directive which you can use to tell FreeBSD
> Update not to touch some files (even if they haven't been modified locally).
> 
> FreeBSD Update will never produce mangled files as a result of applying a
> bsdiff patch to the wrong file -- it checks file hashes before and after
> applying patches and gracefully falls back to downloading complete files
> if it can't generate a file via patching.

If freebsd-update allowed an 'upgrade' to the version already installed, 
one could (mis)use it as a tool to repair a 'broken' system... (probably 
a naive idea.)

Jan Henrik