Date: Tue, 4 May 2004 15:28:47 -0400 From: John Baldwin <jhb@FreeBSD.org> To: Danny Braniss <danny@cs.huji.ac.il> Cc: freebsd-current@FreeBSD.org Subject: Re: kenv enhancement Message-ID: <200405041528.47632.jhb@FreeBSD.org> In-Reply-To: <20040504061200.9713643D46@mx1.FreeBSD.org> References: <20040504061200.9713643D46@mx1.FreeBSD.org>
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On Tuesday 04 May 2004 02:11 am, Danny Braniss wrote: > > On Saturday 01 May 2004 08:22 am, Danny Braniss wrote: > > > Hi, > > > I propose to bring back some lost options to kenv, -c and -s > > > ie, > > > kenv -c class [-s] > > > so that > > > kenv -h is equivalent to kenv -c hint. > > > and > > > kenv -c boot.nfsroot. -s > > > gives: > > > nfshandle="X9ca48b3f5b77454e0c00000002000000bfa306310000000000000000000 > > >0000 0X" path="/d/6" > > > server="132.65.16.100" > > > > > > the 'enhanced' kenv is in > > > ftp://ftp.cs.huji.ac.il/users/danny/freebsd/kenv/ > > > > > > danny > > > > I rototilled this a bit to make it use the existing style. I also > > renamed 'class' to prefix since you can do things like 'kenv -p kern -s' > > to get interesting output like: > > > > el="kernel" > > el_options="" > > elname="/boot/kernel/kernel" > > > > :-P > > > > One thing to note is that 'kenv -p foo' is basically the same as > > 'kenv | grep ^foo', and that 'kenv -p foo -s' is basically the same as > > 'kenv | sed -ne '/^foo/{s///;p;}'. Generally new options aren't added to > > programs if they can be easily duplicated via a simple pipeline. Is > > there a reason that you need kenv to do this explicitly rather than using > > sed or grep? > > We use it very early in the boot process - rc.d/initdiskless, and > /usr might not be mounted - not true in my particular case though. > BTW, the flags I used are the same that once were in kenv and somewhere > down the road were removed. Do you know when they were in kenv? Those flags don't appear in any of the versions in CVS and, it is actually a fairly recent program: ---------------------------- revision 1.1 date: 2000/07/08 08:33:40; author: peter; state: Exp; branches: 1.1.2; Initial kenv(1) hack for dumping the kernel environment. This can be used to extract modified boot hints to make loader(8)-time changes "sticky". It tries to use \ style quoting so that it can be used directly with foo.conf files. It can also extract specific variables. ---------------------------- -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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