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#
# /etc/rc.diskless - general BOOTP startup
#
# BOOTP has mounted / for us. Assume a read-only mount. We must then
# - figure out where the NFS mount is coming from
# - figure out our IP by querying the interface
# - retarget /conf/ME softlink to proper configuration script directory
#
# It is expected that /etc/fstab and /etc/rc.conf.local will be
# set by the system operator on the server to be softlinks to
# /conf/ME/fstab and /conf/ME/rc.conf.local. The system operator may
# choose to retarget other files as well. The server itself boots
# properly with its default /conf/ME softlink pointing to
# /conf/server.host.name.
#
# During a diskless boot, we retarget the /conf/ME softlink to point
# to /conf/DISKLESS.CLIENT.IP.ADDRESS. Thus, various system config
# files that are softlinks through /conf/ME also get retargeted.
#
# SEE SAMPLE FILES IN /usr/share/examples/diskless.
# chkerr:
#
# Routine to check for error
#
# checks error code and drops into shell on failure.
# if shell exits, terminates script as well as /etc/rc.
chkerr() {
if [ $1 != 0 ]; then
echo "$2 failed: dropping into /bin/sh"
/bin/sh
# RESUME
fi
}
# DEBUGGING
#
set -v
# Figure out where the root mount is coming from, synthesize a mount
# for /usr and mount it.
#
# e.g. nfs_root might wind up as "A.B.C.D:/"
#
# NOTE! the /usr mount is only temporary so we can access commands necessary
# to retarget /conf/ME. The actual /usr mount should be part of the
# retargeted /etc/fstab. See instructions in /usr/share/examples/diskless.
#
set `/bin/df /`
nfs_root=$8
mount_nfs -o ro ${nfs_root}/usr /usr
chkerr $? "mount of /usr"
# Figure out our interface and IP.
#
bootp_ifc=`route -n get default | fgrep interface | awk '{ print $2; }'`
bootp_ipa=`ifconfig $bootp_ifc | fgrep inet | head -1 | awk '{ print $2; }'`
echo "Interface $bootp_ifc IP-Address $bootp_ipa"
umount /usr
# retarget /conf/ME
#
# MFS's background process takes a bit to startup. Various config files
# on server should be softlinks through /conf/ME. The server's own /conf/ME
# points to the server's version of the files.
#
# We retarget /conf/ME using a -o union mount. This allows
# us to 'mkdir' over whatever was there previously.
#
# WARNING! null mounts cannot handle mmap, and since many programs
# use mmap (such as 'cp'), we have to copy.
mount_mfs -s 256 -T qp120at -o union dummy /conf
chkerr $? "MFS mount on /conf"
mkdir /conf/ME
cp -Rp /conf/$bootp_ipa/* /conf/ME
# retarget the kernel
#
sysctl -w kern.bootfile=/conf/ME/kernel
# Tell /etc/rc to run the specified script after
# it does its mounts but before it does anything
# else.
#
# This script is responsible for setting up the
# diskless mount environment. This can be
# overriden by /conf/ME/rc.conf.local if, for
# example, you do not want to run the standard
# system /etc/rc.diskless2
diskless_mount="/etc/rc.diskless2"
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