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|
#!/bin/sh
# This script is run once when the system first boots. Its sole
# purpose is to create /etc/default/sysconf (the overall system
# configuration file) and other files derived from this.
#
# The script runs immediately after S10checkroot.sh - this is the
# point at which the rootfs will be mounted rw even if the kernel
# booted with it ro.
#
# rm or mv the file to run this again. If this is done the
# following configuration files will be rewritten:
#
# /etc/default/sysconf
# /etc/hostname
# /etc/defaultdomain
# /etc/network/interfaces
# /etc/resolv.conf
#
# /etc/default/functions contains useful utility functions - it's
# in a separate file so that it can be loaded by any script
. /etc/default/functions
#
config valid && test "$1" != reload && exit 0
#
# Utility to deal with absence of DNS configuration
echodns(){
local dns
if test $# -gt 0
then
for dns in "$@"
do
echo "nameserver $dns"
done
fi
}
#
# The SysConf device must exist in /dev at this point for this script
# to work.
#
# It is important not to hard-wire the name of the device because of
# the posibility of changing the flash partition layout.
#
# The block device is used here because at present udev does not
# show the character devices
sysdev=
config valid || sysdev="$(mtblockdev SysConf)"
if test -n "$sysdev" -a -b "$sysdev"
then
# Read the defined part of SysConf into /etc/default/sysconf.
# SysConf has lines of two forms:
#
# [section]
# name=value
#
# In practice SysConf also contains other stuff, use the command:
#
# devio '<</dev/mtd1;cpb'
#
# to examine the current settings. The badly formatted stuff
# is removed (to be exact, the sed script selects only lines
# which match one of the two above). The lan interface, which
# defaults to ixp0, is changed to the correct value for openslug,
# eth0. The bootproto, which LinkSys sets to static in manufacturing,
# is reset to dhcp if the IP is still the original (192.168.1.77)
devio "<<$sysdev" cpb fb1,10 | sed -n '/^\[[^][]*\]$/p;
s/^lan_interface=ixp0$/lan_interface=eth0/;
/^ip_addr=192\.168\.1\.77$/,/^bootproto/s/^bootproto=static$/bootproto=dhcp/;
/^[-a-zA-Z0-9_][-a-zA-Z0-9_]*=/p' >/etc/default/sysconf
#
# The SysConf must have a hardware id, if it doesn't it has
# probably been erased or never set in the first place and the
# hardware id is retrieved from the RedBoot partition. This is
# the only thing which cannot be defaulted.
fi
#
# Error recovery: no SysConf or invalid SysConf. Make a new one from the
# RedBoot hardware ID information.
# NOTE: this block of code overwrites the shell script arguments.
config valid || {
reddev="$(mtblockdev RedBoot)"
initmac=
if test -n "$reddev" -a -b "$reddev"
then
# The hardware id starts 80 bytes before the end of the
# block, the block ends (or should end) with the signature
# <4 bytes> sErCoMm <bytes> sErCoMm. Note that devio 'pf'
# empties the stack.
set -- $(devio "<<$reddev" '
<= $80-
.= @
pf %02X
A= 5
$( 1
A= @,A1-
pf :%02X
$) A
pn
<=f4+;cp7;pn
<=$7-;cp7;pn')
if test $# -eq 3 -a "$2" = sErCoMm -a "$3" = sErCoMm
then
initmac="$1"
fi
fi
#
# APEX: may need extra code to set initmac here.
#
if test -n "$initmac"
then
#
# Generate a complete /etc/default/sysconf based on just
# one number ;-)
{ echo '[network]'
echo "hw_addr=$initmac"
} >/etc/default/sysconf
#
# See /etc/default/functions (the config function) for
# the derivation of the rest of the information.
fi
}
#
# The config function will now return the correct values - even if sysconf
# is still missing. 'config valid' says if valid configuration information
# is available.
#
# Set up the 'standard' files in the root file system (these couldn't be set
# up before because they depend on stuff which RedBoot puts into SysConf from
# the ID info on the specific machine - in particular the hardware address of
# eth0, which must be the one assigned for *this* box!)
#
# HOSTNAME: defaults to LGK<mac> i.e. something derived from
# the ethernet hardware. LinkSys documentation explains how
# to determine this. Set by the user in linksys setup software.
# DOMAINNAME: LinkSys puts this in w_d_name.
test -n "$(config host)" && config host >/etc/hostname
domain="$(config domain)"
test -n "$domain" && echo "$domain" >/etc/defaultdomain
#
# Ethernet information. This goes into /etc/network/interfaces,
# however this is only used for static setup (and this is not
# the default). With dhcp the openslug udhcp script,
# /etc/udhcpc.d/50default, loads the values from sysconf. The
# lan_interface config value must exist for the file to be
# overwritten here.
iface="$(config iface)"
if test -n "$iface"
then
boot="$(config boot)"
# Only dhcp and static are supported at present - bootp
# support requires installation of appropriate packages
# dhcp is the fail-safe
case "$boot" in
dhcp|static) ;;
*) boot=dhcp;;
esac
#
mac="$(config mac)"
ip="$(config ip)"
netmask="$(config netmask)"
gateway="$(config gateway)"
{
echo "# /etc/network/interfaces"
echo "# configuration file for ifup(8), ifdown(8)"
echo "#"
echo "# The loopback interface"
echo "auto lo"
echo "iface lo inet loopback"
echo "#"
echo "# The NSLU2 built-in ethernet"
echo "auto $iface"
echo "# Automatically generated from /etc/default/sysconf"
if config valid
then
echo "# The pre-up option must always be supplied, regardless"
echo "# of configuration, to set the hardware correctly."
echo "# Severe network problems may result if this option is"
echo "# removed."
c=
else
echo "# WARNING: improperly configured network interface."
echo "# WARNING: the pre-up line must be corrected or severe"
echo "# WARNING: network problems may result."
c='#'
mac='<WARNING: unknown hardware address>'
fi
echo "iface $iface inet $boot"
echo "${c} pre-up ifconfig $iface hw ether $mac"
# The following are ignored for DHCP but are harmless
test -n "$ip" && echo " address $ip"
test -n "$netmask" && echo " netmask $netmask"
test -n "$gateway" && echo " gateway $gateway"
} >/etc/network/interfaces
fi
#
# The DNS server information gives up to three nameservers, but this
# currently only binds in the first.
{
test -n "$domain" && echo "search $domain"
echodns $(config dns) $(config dns1) $(config dns2)
} >/etc/resolv.conf
#
# Invalid config must be handled, do this by hacking /etc/motd.
if config valid
then
echo "Host name: $(config host)"
echo "Host ID: $mac"
echo "Network boot method: $boot"
case "$boot" in
static) echo "Host IP address: $ip";;
esac
echo "Use 'turnup init' to reset the configuration"
echo "Use 'turnup disk|nfs -i <device> options to initialise a non-flash root"
echo "Use 'turnup help' for more information"
else
echo "+=====================================================================+"
echo "| +-----------------------+ |"
echo "| | INITIALISATION FAILED | |"
echo "| +-----------------------+ |"
echo "| |"
echo "| This machine has been booted with a temporary ethernet id |"
echo "| The initialisation failed because the machine id was not available |"
echo "| within the flash memory of the NSLU2. You must run: |"
echo "| |"
echo "| turnup init |"
echo "| |"
echo "| To correct this problem. Severe network problems may occur if this |"
echo "| is not done. |"
echo "+=====================================================================+"
fi >/etc/motd
exit 0
|
