rc.initdiskless revision 50357
1# 2# /etc/rc.diskless - general BOOTP startup 3# 4# BOOTP has mounted / for us. Assume a read-only mount. We must then 5# - figure out where the NFS mount is coming from 6# - figure out our IP by querying the interface 7# - retarget /conf/ME softlink to proper configuration script directory 8# 9# It is expected that /etc/fstab and /etc/rc.conf.local will be 10# set by the system operator on the server to be softlinks to 11# /conf/ME/fstab and /conf/ME/rc.conf.local. The system operator may 12# choose to retarget other files as well. The server itself boots 13# properly with its default /conf/ME softlink pointing to 14# /conf/server.host.name. 15# 16# During a diskless boot, we retarget the /conf/ME softlink to point 17# to /conf/DISKLESS.CLIENT.IP.ADDRESS. Thus, various system config 18# files that are softlinks through /conf/ME also get retargeted. 19# 20# SEE SAMPLE FILES IN /usr/share/examples/diskless. 21 22# chkerr: 23# 24# Routine to check for error 25# 26# checks error code and drops into shell on failure. 27# if shell exits, terminates script as well as /etc/rc. 28 29chkerr() { 30 if [ $1 != 0 ]; then 31 echo "$2 failed: dropping into /bin/sh" 32 /bin/sh 33 # RESUME 34 fi 35} 36 37# DEBUGGING 38# 39set -v 40 41# Figure out where the root mount is coming from, synthesize a mount 42# for /usr and mount it. 43# 44# e.g. nfs_root might wind up as "A.B.C.D:/" 45# 46# NOTE! the /usr mount is only temporary so we can access commands necessary 47# to retarget /conf/ME. The actual /usr mount should be part of the 48# retargeted /etc/fstab. See instructions in /usr/share/examples/diskless. 49# 50set `/bin/df /` 51nfs_root=$8 52mount_nfs -o ro ${nfs_root}/usr /usr 53 54chkerr $? "mount of /usr" 55 56# Figure out our interface and IP. 57# 58 59bootp_ifc=`route -n get default | fgrep interface | awk '{ print $2; }'` 60bootp_ipa=`ifconfig ${bootp_ifc} | fgrep inet | head -1 | awk '{ print $2; }'` 61 62echo "Interface ${bootp_ifc} IP-Address ${bootp_ipa}" 63 64umount /usr 65 66# retarget /conf/ME 67# 68# MFS's background process takes a bit to startup. Various config files 69# on server should be softlinks through /conf/ME. The server's own /conf/ME 70# points to the server's version of the files. 71# 72# We retarget /conf/ME using a -o union mount. This allows 73# us to 'mkdir' over whatever was there previously. 74# 75# WARNING! null mounts cannot handle mmap, and since many programs 76# use mmap (such as 'cp'), we have to copy. 77 78mount_mfs -s 256 -T qp120at -o union dummy /conf 79chkerr $? "MFS mount on /conf" 80 81mkdir /conf/ME 82cp -Rp /conf/$bootp_ipa/* /conf/ME 83 84# retarget the kernel 85# 86 87sysctl -w kern.bootfile=/conf/ME/kernel 88 89# Tell /etc/rc to run the specified script after 90# it does its mounts but before it does anything 91# else. 92# 93# This script is responsible for setting up the 94# diskless mount environment. This can be 95# overriden by /conf/ME/rc.conf.local if, for 96# example, you do not want to run the standard 97# system /etc/rc.diskless2 98 99diskless_mount="/etc/rc.diskless2" 100