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#!/bin/sh
# Copyright (C) 2006-2010 OpenWrt.org
# Copyright (C) 2010 Vertical Communications
boot_hook_add() {
local hook="${1}_hook"
local value="$2"
local sep=" "
eval "$hook=\"\${$hook:+\${$hook}\${value:+\$sep}}\$value\""
}
boot_run_hook() {
local boot_func
for boot_func in $(eval "echo \"\$${1}_hook\""); do
$boot_func "$1" "$2"
done
}
find_mtd_part() {
local PART="$(grep "\"$1\"" /proc/mtd | awk -F: '{print $1}')"
local PREFIX=/dev/mtdblock
PART="${PART##mtd}"
[ -d /dev/mtdblock ] && PREFIX=/dev/mtdblock/
echo "${PART:+$PREFIX$PART}"
}
jffs2_ready () {
mtdpart="$(find_mtd_part rootfs_data)"
magic=$(hexdump $mtdpart -n 4 -e '4/1 "%02x"')
[ "$magic" != "deadc0de" ]
}
dupe() { # <new_root> <old_root>
cd $1
echo -n "creating directories... "
{
cd $2
find . -xdev -type d
echo "./dev ./jffs ./mnt ./proc ./tmp"
# xdev skips mounted directories
cd $1
} | xargs mkdir -p
echo "done"
echo -n "setting up symlinks... "
for file in $(cd $2; find . -xdev -type f;); do
case "$file" in
./rom/note) ;; #nothing
./etc/config*|\
./usr/lib/opkg/info/*) cp -af $2/$file $file;;
*) ln -sf /rom/${file#./*} $file;;
esac
done
for file in $(cd $2; find . -xdev -type l;); do
cp -af $2/${file#./*} $file
done
echo "done"
}
pivot() { # <new_root> <old_root>
mount -o move /proc $1/proc && \
pivot_root $1 $1$2 && {
mount -o move $2/dev /dev
mount -o move $2/tmp /tmp
mount -o move $2/sys /sys 2>&-
mount -o move $2/jffs /jffs 2>&-
return 0
}
}
fopivot() { # <rw_root> <ro_root> <dupe?>
root=$1
{
if grep -q mini_fo /proc/filesystems; then
mount -t mini_fo -o base=/,sto=$1 "mini_fo:$1" /mnt 2>&- && root=/mnt
else
mount --bind / /mnt
mount --bind -o union "$1" /mnt && root=/mnt
fi
} || {
[ "$3" = "1" ] && {
mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
dupe $1 $rom
}
}
pivot $root $2
}
ramoverlay() {
mkdir -p /tmp/root
mount -t tmpfs root /tmp/root
fopivot /tmp/root /rom 1
}
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