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#!/bin/bash
# (C) Eric Thibodeau 2006-2008 GPL v2
# Replacement initrc/linuxrc script hack to get diskless NFS nodes booted
# This script is largely inspired by prior work from
# http://mozart.informatik.fh-kl.de/download/Software/GentooDiskless/
#
MODPROBE=/sbin/modprobe
IFCONFIG=/sbin/ifconfig
#MYHOST=$(/sbin/dhcpcd -H; /bin/hostname) # By default, we'll use the DHCP assigned hostname
NODE_NAME="node"
ahostname(){
if [[ -z ${MYHOST} || ${MYHOST} == ${MYIP} ]]; then
echo "DHCP didn't tell me my name. Generating my own hostname..."
MYHOST="${NODE_NAME}${MYIP##*.}"
echo "I proclaim that I am $MYHOST !!"
else
echo "DHCP told me my hostname is ${MYHOST}..."
fi
echo "$0: Setting Hostname to $MYHOST"
echo "HOSTNAME=\"$MYHOST\"" > /etc/conf.d/hostname
/bin/hostname "$MYHOST"
echo "Setting domainname to DHCP's settings: $DOMAIN"
/bin/domainname $DOMAIN
}
# Used to mount the RW part of the ROOT, it should be easy to add other
# FS than tmpfs here.
mount_rw_dev() {
echo "$0: Mounting $RWDEV as Read Write device ..."
if [ $RWDEV == "tmpfs" ]; then
mount -n -t tmpfs -o defaults tmpfs_rw /mnt/rw_mounts/
fi
}
mount_rw_dir() {
while [ "$1" != "" ]; do
echo "$0: Mounting $1 using $UNIONMOD ..."
mkdir -p /mnt/rw_mounts/$1
mount -i -n -t $UNIONMOD -o dirs=/mnt/rw_mounts/$1=rw:/$1=ro ${UNIONMOD}_$1 /$1
shift
done
}
# ahosts was added so that we could dynamically change the NFS server address
# using the rootserver= DHCP option as the NFS mount server. This is usefull
# when you want to split the load onto different NIC interfaces within a same
# logical network.
ahosts() {
echo "Setting rootserver to $ROOTSERV in /etc/hosts file..."
echo "$ROOTSERV rootserver" >> /etc/hosts
echo "Setting up fstab"
echo "$ROOTSERV:$ROOTPATH / nfs ro,defaults,hard,intr,actimeo=120,timeo=14,tcp 0 1" > /etc/fstab
}
# get_param: parses parameters in PARSELINE which could be, for example, the kernel's command line
# (This implies PARSELINE=$(cat /proc/cmdline)
# Example:
# ip=dhcp nfsroot=192.168.1.2:/tftproot/nfsroot/x86_64/,hard,intr init=/boot/stateless.sh softlevel=unionfs
# IN:
# $1: parameter we want (ie: nfsroot)
# $2: which token # we want, ie: the IP address of nfsroot it token 1
get_param() {
PARAM=$2
for opt in $PARSELINE
do
case $opt in
${1}=*) set $(echo $opt | sed -e's/[=:,]/ /g' )
if [[ -z $PARAM ]]; then
shift
echo $*
else
shift $PARAM
echo $1
fi
return 0
;;
esac
done
echo "Parameter '$1' not found" >&2
return 1
}
# Used to extract useful information for the rest of the configuration
# It's a horrible hack that parses dmesg but, unfortunately, /proc/net/pnp
# is insufficient even with /proc/cmdline
# Here is an example output of dmesg (partial)
#IP-Config: Complete:
# device=eth0, addr=10.0.1.140, mask=255.255.255.0, gw=10.0.1.129,
# host=thinkbig24, domain=cluster.local, nis-domain=(none),
# bootserver=10.0.1.129, rootserver=10.0.1.129, rootpath=/tftproot/AthlonXP
import_dhcp_info() {
PARSELINE=$(dmesg | grep -A3 'IP-Config: Complete:' | sed -e 's/[:,]/ /g' | tr -d '\n')
MYIP=$(get_param addr 1)
MYHOST=$(get_param host 1)
DOMAIN=$(get_param domain 1)
ROOTPATH=$(get_param rootpath 1)
ROOTSERV=$(get_param rootserver 1)
}
# if mounting /proc becomes a problem we have to use the following:
# PARSELINE=$(dmesg | grep '^Kernel command line' | sed 's/^Kernel command line://g')
import_cmdline() {
mount -n -t proc none /proc
PARSELINE=$(cat /proc/cmdline)
UNIONMOD=$(get_param unionmod 1)
RWDEV=$(get_param rwdev 1)
}
import_dhcp_info
import_cmdline
[ ! -z $RWDEV ] && mount_rw_dev
if [ ! -z $UNIONMOD ]; then
echo "Loading $UNIONMOD"
# we should detect wether it's a mod or kernel builtin...
$MODPROBE $UNIONMOD
mount_rw_dir etc var tmp
fi
touch /etc || /bin/bash
ahostname
ahosts
exec /sbin/init
|
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