Date: Wed, 24 Apr 2002 09:19:32 +0300 From: Danny Braniss <danny@cs.huji.ac.il> To: obrien@FreeBSD.ORG Cc: Robert Watson <rwatson@FreeBSD.ORG>, Terry Lambert <tlambert2@mindspring.com>, Freebsd Current <current@FreeBSD.ORG> Subject: Re: diskless booting Message-ID: <E170G7o-0002Dy-00@cs.huji.ac.il> In-Reply-To: Message from "David O'Brien" <obrien@FreeBSD.ORG> of "Tue, 23 Apr 2002 10:40:40 PDT." <20020423104040.A2524@dragon.nuxi.com>
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> On Tue, Apr 23, 2002 at 08:32:51PM +0300, Danny Braniss wrote:
> > > On Tue, Apr 23, 2002 at 12:19:58PM -0400, Robert Watson wrote:
> > > > diskless_root_readonly="NO" # Make it "YES" for readonly
> > >
> > > good.
> > >
> > > > diskless_etc_localmd="NO" # Make it "YES" to have the
> > > > # diskless environment md-mount and replicate /etc from /conf
> > >
> > > Seems the "if [ -d ]" tests in rc.diskless are OK already. If we add
> > > this knob, then a knob should also be added for the source of the files
> > > rather than assuming /conf/etc or /conf/{client}/etc. In other words
> > > either really engineer this to make diskless properly configurable, or
> > > have the minimal number of knobs, etc.
> >
> > nice, but impractical, because of the chicken and egg problem, or in other
> > words, the load/over-write of rc.conf[.local] happens a bit later ...
>
> Please explain farther what is impractical and where the chicken-and-egg
> problem is. I rc.diskless1 already has:
>
> if [ -d /conf/default/etc ]; then
> ..snip..
> if [ -d /conf/${i}/etc ]; then
in rc.diskless1 is where the decision is made about /etc, /tmp, /var.
the mount is done some lines before the test.
i guess a first run could be made, before the actual mount:
...
echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa} Broadcast ${bootp_ipbca}"
for i in ${bootp_ipbca} ${bootp_ipa} ${hostname} ; do
if [ -d /conf/${i}/etc ]; then
if [ -r /conf/${i}/etc/rc.conf ]; then
. /etc/defaults/rc.conf
...
IMHO, the solution is a bit of klduge :-), and sort of breaks the KISS
principle.
danny
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