Date: Wed, 4 May 2005 22:15:25 +0100 From: Thomas Sparrevohn <Thomas.Sparrevohn@btinternet.com> To: freebsd-hackers@freebsd.org Subject: Re: mergemaster improvement (auto-update for not modified files) Message-ID: <200505042215.26426.Thomas.Sparrevohn@btinternet.com> In-Reply-To: <20050503.233855.116351361.imp@bsdimp.com> References: <20050503120958.Y42342@eleanor.us1.wmi.uvac.net> <20050503222512.GA53874@crow.addict.de> <20050503.233855.116351361.imp@bsdimp.com>
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On Wednesday 04 May 2005 06:38, M. Warner Losh wrote: > > The technical reasons are very simple. If a new system call is > created, and programs use that new system call, then if you do an > installworld before you boot the kernel, that can result in binaries > not working. This has happened with important ones like /bin/sh in > the past. In addition, if you aren't running single user, many > different races exist in the installation process that can result in > bad behavior. There are also potential problems with symbols in > there's a large jump between the revisions being updated. > > Usually you can get away with it, but if you want to be safe, you must > do the install in single user. Usually, however, has lead in the past > to problems, which is why the project recommendations are > conservative. > A auto-scripted install directly run from rc.d in single-user mode would cover both requirements - I seem to recall that Solaris had something like it at a point. Somewhat along the lines of nextboot would be nice.
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