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|
# . this file to load the following utility functions
#
# mtdev "name"
# return (output) the character device name for flash parition "name"
# /proc/mtd has the general form:
# dev: size erasesize name
# mtd5: 00020000 00020000 "FIS directory"
# use this rather than hard-wiring the device because the partition
# table can change - looking in /proc/mtd is more reliable.
mtdev(){
sed -n 's!^\(mtd[0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/\1!p' /proc/mtd
}
#
# mtblockdev "name"
# as mtdev but output the name of the block (not character) device
mtblockdev(){
sed -n 's!^mtd\([0-9][0-9]*\):[^"]*"'"$1"'"$!/dev/mtdblock\1!p' /proc/mtd
}
#
# mtsize "name"
# the size of the partition as a hexadecimal value (with 0x at the front)
mtsize(){
sed -n 's!^mtd[0-9][0-9]*: \([^ ]*\)[^"]*"'"$1"'"$!0x\1!p' /proc/mtd
}
#
# sysvalmatch "section" "name" 'pattern' "configuration file"
# sysvalof "section" "name" "configuration file"
# sysval "section" "name"
# outputs the value of the SysConf variable 'name' from section 'section',
# this is a bit gross, when it gets a match it copies the value to the
# hold space, if no match it jumps over the copy, at the end ($) it copies
# the hold space to the pattern space and prints the result, thus it only
# ever prints the last match
# BUG FIX: busybox sed doesn't initialise the hold space and crashes if it
# is used before initialisation, so temporarily this script does it's own
# tail by hand.
# NOTE: these functions should only be used internally, add entries to 'config'
# below if necessary. This is because 'config' does the defaulting and in the
# recovering case (zero or absent SysConf) /etc/default/sysconf only contains
# the hw_addr entry!
sysvalmatch(){
# sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^'"$2"'=\('"$3"'\)$/\1/;tH;bE;:H;h;:E;$g;$p' "$4"
sed -n '/^\['"$1"'\]$/,/^\[.*\]$/s/^'"$2"'=\('"$3"'\)$/\1/p' "$4" | sed -n '$p'
}
sysvalof(){
sysvalmatch "$1" "$2" '.*' "$3"
}
sysval(){
sysvalof "$1" "$2" /etc/default/sysconf
}
#
# config "value"
# convenience callers for specific values to avoid mis-typing in scripts
# NOTE: this function does the defaulting, 'sysval' does not! Validity
# of the sysconf file is determined by the presence of the all important
# hw_addr.
config(){
local mac
mac=
test -r /etc/default/sysconf &&
mac="$(sysvalmatch network hw_addr '[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]:[0-9A-Za-z][0-9A-Za-z]' /etc/default/sysconf)"
if test -n "$mac"
then
case "$1" in
mac) echo "$mac";;
host) if test -n "$(sysval network disk_server_name)"
then
sysval network disk_server_name
elif test -n "$(sysval network default_server_name)"
then
sysval network default_server_name
else
echo "$mac" | sed -n 's/^..:..:..:\(..\):\(..\):\(..\)$/LKG\1\2\3/p'
fi;;
domain) sysval network w_d_name;;
iface) if test -n "$(sysval network lan_interface)"
then
sysval network lan_interface
else
echo eth0
fi;;
ip) if test -n "$(sysval network ip_addr)"
then
sysval network ip_addr
else
echo 192.168.1.77
fi;;
netmask)sysval network netmask;;
gateway)sysval network gateway;;
dns) sysval network dns_server1;;
dns2) sysval network dns_server2;;
dns3) sysval network dns_server3;;
boot) if test -n "$(sysval network bootproto)"
then
sysval network bootproto
else
echo dhcp
fi;;
valid) return 0;;
*) return 1;;
esac
else
# These are the defaults for an invalid mac address, use the compiled
# in hardware address.
case "$1" in
mac) echo "00:02:B3:02:02:01";;
host) echo "brokenslug";;
iface) echo eth0;;
ip) echo 192.168.1.77;;
boot) echo dhcp;;
*) return 1;;
esac
fi
}
#
# checkif "iface"
# Validate an interface name by making sure that it exists
# in /proc/net/dev (and is not lo). The listing outputs the
# interface followed by a :, the check function looks for
# something of the form '$1[a-zA-Z0-9]*:' and outputs the
# part preceding the ':'
checkif(){
sed -n '/^[ ]*lo:/d;s/^[ ]*\('"$1"'[a-zA-Z0-9]*\):.*$/\1/p;tE;d;:E;q' /proc/net/dev
}
#
# checkmount "mountpoint"
# tests an already mounted mountpoint to see whether to attempt to
# boot with this as root. Returns success if it appears ok.
checkmount(){
# basic test for init (the kernel will try to load this)
# but require a shell in bin/sh and no .recovery too
test \( ! -f "$1/.recovery" \) -a \
\( -d "$1/initrd" -o -d "$1/mnt" \) -a \
\( -x "$1/bin/sh" -o -h "$1/bin/sh" \) -a \
\( -x "$1/sbin/init" -o -h "$1/sbin/init" -o \
-x "$1/etc/init" -o -h "$1/etc/init" -o \
-x "$1/bin/init" -o -h "$1/bin/init" \)
}
#
# swivel "new root" "old root"
# NOTE: the arguments must be paths relative to /, bad things
# will happen if the arguments themselves start with /
# Pivot to a new root. This does all the fancy pivot_root stuff
# including closing streams and does a umount /proc - it doesn't
# matter if this fails (failure codes are ignored), but if /proc
# was mounted it must be restored by the caller on return.
# Normally this function never returns!
# On return 0,1,2 are connected to /dev/console - this may not
# have been true before!
swivel() {
cd "$1"
exec <&- >&- 2>&-
# This is just-in-case the called mounted /proc and was
# unable to close it because of the streams
umount /proc 2>/dev/null
if pivot_root . "$2"
then
# everything must move out of the old root, this process
# is $2/bin/sh so it must die, IO is redirected
# just in case - typically it will be to a device so it
# won't hold the old root open.
# the exec here is the first point at which the old root
# is unused - before the exec regardless of the close of
# 0,1,2 above ash still has *this* shell script open!
# (it's on fd 10).
# init closes all file descriptors, there's no point
# supplying it with fds.
exec "$2/usr/sbin/chroot" . bin/sh -c "\
test -x sbin/init && exec sbin/init
test -x etc/init && exec etc/init
test -x bin/init && exec bin/init
leds -A +gr1 '!g1'
sleep 10 >/.recovery
sync;sync;sync
exit 1"
fi
#
# recovery - must restore the old root
cd "$2"
sbin/pivot_root . "$1"
# cd is back to $1 - either pivot_root doesn't change it and the
# chroot above was not executed, or pivot_root does change it and
# has just changed it back!
exec <>/dev/console >&0 2>&0
}
#
# ifup "interface"
# bring that interface up with the configured ip and other
# information
ifup(){
local ip hostname router subnet iface HOSTNAME NETMASK BROADCAST
iface="$1"
ip="$(config ip)"
hostname="$(config host)"
router="$(config gateway)"
broadcast=
if test -n "$ip"
then
# only if an ip was specified
subnet="$(config netmask)"
else
ip=192.168.1.77
fi
# First try udhcpc - note that the /boot/udhcpc.script
# simply records the values returned and the udhcpc
# is not left running so this will only work for
# the lease length time!
ifconfig "$iface" up
test -n "$hostname" && HOSTNAME="-H $hostname"
# The script writes the required shell variable assignments
# to file descriptor 9
eval $(udhcpc -i "$iface" -n -q -r "$ip" $HOSTNAME -s /boot/udhcpc.script 9>&1 >/dev/null)
test -n "$broadcast" && BROADCAST="broadcast $broadcast"
test -n "$subnet" && NETMASK="netmask $subnet"
if ifconfig "$iface" "$ip" $NETMASK $BROADCAST
then
for route in $router
do
route add default gw "$route" dev "$iface"
done
return 0
else
ifconfig "$iface" down
return 1
fi
}
#
# ifdown "interface"
# take the interface down
ifdown(){
ifconfig "$1" down
}
#
# mountflash "flash root directory" {mount options}
# Finds and mounts the flash file system on the given directory
mountflash() {
local ffsdev ffsdir
ffsdir="$1"
test -n "$ffsdir" -a -d "$ffsdir" || {
echo "$0: mountflash $ffsdir: not a directory (internal error)" >&2
return 1
}
shift
ffsdev="$(mtblockdev Flashdisk)"
test -n "$ffsdev" -a -b "$ffsdev" || {
echo "$0: unable to find flash file system to copy ($ffsdev)" >&2
return 1
}
mount -t jffs2 "$@" "$ffsdev" "$ffsdir" || {
echo "$0: $ffsdev: unable to mount flash file system on $ffsdir" >&2
return 1
}
return 0
}
|
