Date: Wed, 26 Nov 2003 10:07:37 -0800 From: Tim Kientzle <kientzle@acm.org> To: "Matthew D. Fuller" <fullermd@over-yonder.net> Cc: freebsd-current@freebsd.org Subject: Re: HEADS UP: /bin and /sbin are now dynamically linked Message-ID: <3FC4EBE9.40109@acm.org> In-Reply-To: <20031126161637.GO12248@over-yonder.net> References: <20031123012222.GB11523@dragon.nuxi.com> <p06002003bbe5c0f30237@[10.0.1.2]> <20031123042635.GB677@saboteur.dek.spc.org> <3FC16644.7070005@acm.org> <20031124114006.GA60761@dragon.nuxi.com> <p06002002bbe7fd7ac23c@[128.113.24.47]> <20031124210748.GG15294@wombat.localnet> <20031124224144.GC67578@dragon.nuxi.com> <20031125160934.GH12248@over-yonder.net> <p0600200bbbe94e00a24a@[128.113.24.47]> <20031126161637.GO12248@over-yonder.net>
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Matthew D. Fuller wrote: > On Tue, Nov 25, 2003 at 01:41:53PM -0500 I heard the voice of > Garance A Drosihn, and lo! it spake thus: > >>It is a bit more complicated than that, because programs may >>include embedded references to other files. So, I think >>some developer would *have* to do a little up-front work for >>any program that would be optionally-added to /rescue. > > > Oh, sure; nothing's ever as easy as it should be :) > > The advantage of this method is it's simple, cheap, automatic, and lets > us say "You can try setting ADDITIONAL_RESCUE=usr.sbin/foo in make.conf > and it may work", without putting extra burden on developers or people > who don't wanna. It may only be a fifth of a loaf, but... ... but a /rescue that doesn't work is useless. The one critical property of /rescue is that it MUST WORK when /bin and /sbin are both hosed. Your technique here cannot gaurantee this. Testing /rescue is not a simple exercise. You must first break both /bin and /sbin and unmount /usr. You must then test EVERY part of /rescue, since adding or removing one program can potentially break other programs (whose hard-coded references to that program may need to be adjusted). There are (fortunately) a few shortcuts (I spent a long time poring over the output of 'strings /rescue/rescue' to check for hard-coded references), but it's still not pretty. Tim
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