Date: Sun, 20 Jul 2003 11:03:50 +0300 From: Peter Pentchev <roam@ringlet.net> To: LLeweLLyn Reese <llewelly@lifesupport.shutdown.com> Cc: hackers@freebsd.org Subject: Re: complicated downgrade Message-ID: <20030720080350.GN350@straylight.oblivion.bg> In-Reply-To: <x33ch2o6uf.fsf@lifesupport.shutdown.com> References: <20030718091248.GO76126@lucky.net> <x33ch2o6uf.fsf@lifesupport.shutdown.com>
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On Sat, Jul 19, 2003 at 08:48:40AM -0700, LLeweLLyn Reese wrote:
> Valentin Nechayev <netch@lucky.net> writes:
> [snip]
> > 8. Disable all processes except sshd and run the following (saying generally):
> >
> > for D in /bin /sbin /etc /boot /usr/bin /usr/sbin /usr/lib /usr/libexec \
> > /usr/libdata /usr/share /usr/local /var/db
> > do
> > mv ${D} ${D}5
> > mv ${D}4 {D}
> > done
> [snip]
>
> Once you mv /usr/lib /usr/lib5, dynamicly linked executables will be
> broken, until you mv /usr/lib4 /usr/lib (I think). I think it
> would be a good idea check every tool you think you might need,
> and build a staticly linked executable if the existing executable
> isn't. Most of what you need will be staticly linked by default,
> but e.g. sshd, ftp, find, vim, are not. (If all goes as planned,
> you won't need any of those while /usr/lib is being moved, but
> ... ) (Caveat: this isn't based on experience with freebsd, it's
> based experience with linux boxen, where *everything* is typically
> staticly linked, unless someone rebuilt tools.)
This thought occurred to me too; actually, you could get around this
problem by rebuilding the whole FreeBSD base system with purely static
binaries. This could be done by putting NOSHARED=yes in /etc/make.conf,
then going through the buildworld/buildkernel/installkernel/installworld
dance. You might have to do this for your 5.x world, reboot with the
statically-linked binaries (just in case), build the 4.x world with
NOSHARED=yes before the downgrade, do the downgrade (without having to
worry about any dynamic libs), then, when the 4.x system is working
(hopefully), rebuild the 4.x world without the NOSHARED=yes setting.
Note that a NOSHARED world tends to take up quite a bit more space :)
G'luck,
Peter
--
Peter Pentchev roam@ringlet.net roam@sbnd.net roam@FreeBSD.org
PGP key: http://people.FreeBSD.org/~roam/roam.key.asc
Key fingerprint FDBA FD79 C26F 3C51 C95E DF9E ED18 B68D 1619 4553
I've heard that this sentence is a rumor.
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