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#!/bin/sh
RAM_ROOT=/tmp/root
ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
libs() { ldd $* | awk '{print $3}'; }
install_file() { # <file> [ <file> ... ]
for file in "$@"; do
dest="$RAM_ROOT/$file"
[ -f $file -a ! -f $dest ] && {
dir="$(dirname $dest)"
mkdir -p "$dir"
cp $file $dest
}
done
}
install_bin() { # <file> [ <symlink> ... ]
src=$1
files=$1
[ -x "$src" ] && files="$src $(libs $src)"
install_file $files
[ -e /lib/ld-linux.so.3 ] && {
install_file /lib/ld-linux.so.3
}
shift
for link in "$@"; do {
dest="$RAM_ROOT/$link"
dir="$(dirname $dest)"
mkdir -p "$dir"
[ -f "$dest" ] || ln -s $src $dest
}; done
}
pivot() { # <new_root> <old_root>
mount | grep "on $1 type" 2>&- 1>&- || mount -o bind $1 $1
mkdir -p $1$2 $1/proc $1/dev $1/tmp $1/overlay && \
mount -o move /proc $1/proc && \
pivot_root $1 $1$2 || {
umount $1 $1
return 1
}
mount -o move $2/dev /dev
mount -o move $2/tmp /tmp
mount -o move $2/overlay /overlay 2>&-
return 0
}
run_ramfs() { # <command> [...]
install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \
/sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd \
/bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
/bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump \
/bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc
install_bin /sbin/mtd
for file in $RAMFS_COPY_BIN; do
install_bin $file
done
install_file /etc/resolv.conf /etc/functions.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
pivot $RAM_ROOT /mnt || {
echo "Failed to switch over to ramfs. Please reboot."
exit 1
}
mount -o remount,ro /mnt
umount -l /mnt
grep /overlay /proc/mounts > /dev/null && {
mount -o remount,ro /overlay
umount -l /overlay
}
# spawn a new shell from ramdisk to reduce the probability of cache issues
exec /bin/busybox ash -c "$*"
}
run_hooks() {
local arg="$1"; shift
for func in "$@"; do
eval "$func $arg"
done
}
ask_bool() {
local default="$1"; shift;
local answer="$default"
[ "$INTERACTIVE" -eq 1 ] && {
case "$default" in
0) echo -n "$* (y/N): ";;
*) echo -n "$* (Y/n): ";;
esac
read answer
case "$answer" in
y*) answer=1;;
n*) answer=0;;
*) answer="$default";;
esac
}
[ "$answer" -gt 0 ]
}
v() {
[ "$VERBOSE" -ge 1 ] && echo "$@"
}
rootfs_type() {
mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
}
get_image() { # <source> [ <command> ]
local from="$1"
local conc="$2"
local cmd
case "$from" in
http://*|ftp://*) cmd="wget -O- -q";;
*) cmd="cat";;
esac
if [ -z "$conc" ]; then
local magic="$(eval $cmd $from | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
case "$magic" in
1f8b) conc="zcat";;
425a) conc="bzcat";;
esac
fi
eval "$cmd $from ${conc:+| $conc}"
}
get_magic_word() {
get_image "$@" | dd bs=2 count=1 2>/dev/null | hexdump -v -n 2 -e '1/1 "%02x"'
}
get_magic_long() {
get_image "$@" | dd bs=4 count=1 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
}
refresh_mtd_partitions() {
mtd refresh rootfs
}
jffs2_copy_config() {
if grep rootfs_data /proc/mtd >/dev/null; then
# squashfs+jffs2
mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
else
# jffs2
mtd jffs2write "$CONF_TAR" rootfs
fi
}
default_do_upgrade() {
sync
if [ "$SAVE_CONFIG" -eq 1 -a -z "$USE_REFRESH" ]; then
get_image "$1" | mtd -j "$CONF_TAR" write - "${PART_NAME:-image}"
else
get_image "$1" | mtd write - "${PART_NAME:-image}"
fi
}
do_upgrade() {
v "Performing system upgrade..."
if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
platform_do_upgrade "$ARGV"
else
default_do_upgrade "$ARGV"
fi
[ "$SAVE_CONFIG" -eq 1 -a -n "$USE_REFRESH" ] && {
v "Refreshing partitions"
if type 'platform_refresh_partitions' >/dev/null 2>/dev/null; then
platform_refresh_partitions
else
refresh_mtd_partitions
fi
if type 'platform_copy_config' >/dev/null 2>/dev/null; then
platform_copy_config
else
jffs2_copy_config
fi
}
v "Upgrade completed"
[ -n "$DELAY" ] && sleep "$DELAY"
ask_bool 1 "Reboot" && {
v "Rebooting system..."
reboot -f
sleep 5
echo b 2>/dev/null >/proc/sysrq-trigger
}
}
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