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+#!/bin/sh
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+
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+RAM_ROOT=/tmp/root
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+
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+ldd() { LD_TRACE_LOADED_OBJECTS=1 $*; }
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+libs() { ldd $* | awk '{print $3}'; }
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+
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+install_file() { # <file> [ <file> ... ]
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+ for file in "$@"; do
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+ dest="$RAM_ROOT/$file"
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+ [ -f $file -a ! -f $dest ] && {
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+ dir="$(dirname $dest)"
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+ mkdir -p "$dir"
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+ cp $file $dest
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+ }
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+ done
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+}
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+
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+install_bin() { # <file> [ <symlink> ... ]
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+ src=$1
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+ files=$1
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+ [ -x "$src" ] && files="$src $(libs $src)"
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+ install_file $files
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+ [ -e /lib/ld.so.1 ] && {
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+ install_file /lib/ld.so.1
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+ }
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+ shift
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+ for link in "$@"; do {
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+ dest="$RAM_ROOT/$link"
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+ dir="$(dirname $dest)"
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+ mkdir -p "$dir"
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+ [ -f "$dest" ] || ln -s $src $dest
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+ }; done
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+}
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+
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+supivot() { # <new_root> <old_root>
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+ /bin/mount | grep "on $1 type" 2>&- 1>&- || /bin/mount -o bind $1 $1
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+ mkdir -p $1$2 $1/proc $1/sys $1/dev $1/tmp $1/overlay && \
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+ /bin/mount -o noatime,move /proc $1/proc && \
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+ pivot_root $1 $1$2 || {
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+ /bin/umount -l $1 $1
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+ return 1
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+ }
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+
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+ /bin/mount -o noatime,move $2/sys /sys
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+ /bin/mount -o noatime,move $2/dev /dev
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+ /bin/mount -o noatime,move $2/tmp /tmp
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+ /bin/mount -o noatime,move $2/overlay /overlay 2>&-
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+ return 0
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+}
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+
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+run_ramfs() { # <command> [...]
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+ install_bin /bin/busybox /bin/ash /bin/sh /bin/mount /bin/umount \
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+ /sbin/pivot_root /usr/bin/wget /sbin/reboot /bin/sync /bin/dd \
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+ /bin/grep /bin/cp /bin/mv /bin/tar /usr/bin/md5sum "/usr/bin/[" \
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+ /bin/dd /bin/vi /bin/ls /bin/cat /usr/bin/awk /usr/bin/hexdump \
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+ /bin/sleep /bin/zcat /usr/bin/bzcat /usr/bin/printf /usr/bin/wc \
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+ /bin/cut /usr/bin/printf /bin/sync /bin/mkdir /bin/rmdir \
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+ /bin/rm /usr/bin/basename /bin/kill /bin/chmod
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+
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+ install_bin /sbin/mtd
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+ install_bin /sbin/ubi
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+ install_bin /sbin/mount_root
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+ install_bin /sbin/snapshot
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+ install_bin /sbin/snapshot_tool
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+ install_bin /usr/sbin/ubiupdatevol
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+ install_bin /usr/sbin/ubiattach
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+ install_bin /usr/sbin/ubiblock
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+ install_bin /usr/sbin/ubiformat
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+ install_bin /usr/sbin/ubidetach
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+ install_bin /usr/sbin/ubirsvol
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+ install_bin /usr/sbin/ubirmvol
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+ install_bin /usr/sbin/ubimkvol
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+ for file in $RAMFS_COPY_BIN; do
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+ install_bin ${file//:/ }
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+ done
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+ install_file /etc/resolv.conf /lib/*.sh /lib/functions/*.sh /lib/upgrade/*.sh $RAMFS_COPY_DATA
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+
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+ [ -L "/lib64" ] && ln -s /lib $RAM_ROOT/lib64
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+
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+ supivot $RAM_ROOT /mnt || {
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+ echo "Failed to switch over to ramfs. Please reboot."
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+ exit 1
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+ }
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+
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+ /bin/mount -o remount,ro /mnt
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+ /bin/umount -l /mnt
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+
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+ grep /overlay /proc/mounts > /dev/null && {
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+ /bin/mount -o noatime,remount,ro /overlay
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+ /bin/umount -l /overlay
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+ }
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+
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+ # spawn a new shell from ramdisk to reduce the probability of cache issues
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+ exec /bin/busybox ash -c "$*"
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+}
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+
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+kill_remaining() { # [ <signal> ]
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+ local sig="${1:-TERM}"
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+ echo -n "Sending $sig to remaining processes ... "
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+
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+ local my_pid=$$
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+ local my_ppid=$(cut -d' ' -f4 /proc/$my_pid/stat)
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+ local my_ppisupgraded=
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+ grep -q upgraded /proc/$my_ppid/cmdline >/dev/null && {
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+ local my_ppisupgraded=1
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+ }
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+
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+ local stat
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+ for stat in /proc/[0-9]*/stat; do
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+ [ -f "$stat" ] || continue
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+
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+ local pid name state ppid rest
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+ read pid name state ppid rest < $stat
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+ name="${name#(}"; name="${name%)}"
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+
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+ local cmdline
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+ read cmdline < /proc/$pid/cmdline
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+
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+ # Skip kernel threads
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+ [ -n "$cmdline" ] || continue
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+
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+ if [ $$ -eq 1 ] || [ $my_ppid -eq 1 ] && [ -n "$my_ppisupgraded" ]; then
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+ # Running as init process, kill everything except me
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+ if [ $pid -ne $$ ] && [ $pid -ne $my_ppid ]; then
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+ echo -n "$name "
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+ kill -$sig $pid 2>/dev/null
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+ fi
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+ else
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+ case "$name" in
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+ # Skip essential services
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+ *dtach*|*fw-upgrade*|*procd*|*ash*|*init*|*watchdog*|*ssh*|*dropbear*|*telnet*|*login*|*hostapd*|*wpa_supplicant*|*nas*) : ;;
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+
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+ # Killable process
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+ *)
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+ if [ $pid -ne $$ ] && [ $ppid -ne $$ ]; then
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+ echo -n "$name "
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+ kill -$sig $pid 2>/dev/null
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+ fi
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+ ;;
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+ esac
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+ fi
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+ done
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+ echo ""
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+}
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+
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+run_hooks() {
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+ local arg="$1"; shift
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+ for func in "$@"; do
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+ eval "$func $arg"
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+ done
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+}
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+
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+ask_bool() {
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+ local default="$1"; shift;
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+ local answer="$default"
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+
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+ [ "$INTERACTIVE" -eq 1 ] && {
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+ case "$default" in
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+ 0) echo -n "$* (y/N): ";;
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+ *) echo -n "$* (Y/n): ";;
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+ esac
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+ read answer
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+ case "$answer" in
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+ y*) answer=1;;
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+ n*) answer=0;;
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+ *) answer="$default";;
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+ esac
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+ }
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+ [ "$answer" -gt 0 ]
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+}
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+
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+v() {
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+ [ "$VERBOSE" -ge 1 ] && echo "$@"
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+}
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+
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+rootfs_type() {
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+ /bin/mount | awk '($3 ~ /^\/$/) && ($5 !~ /rootfs/) { print $5 }'
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+}
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+
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+get_image() { # <source> [ <command> ]
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+ local from="$1"
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+ local conc="$2"
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+ local cmd
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+
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+ case "$from" in
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+ http://*|ftp://*) cmd="wget -O- -q";;
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+ *) cmd="cat";;
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+ esac
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+ if [ -z "$conc" ]; then
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+ local magic="$(eval $cmd $from 2>/dev/null | dd bs=2 count=1 2>/dev/null | hexdump -n 2 -e '1/1 "%02x"')"
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+ case "$magic" in
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+ 1f8b) conc="zcat";;
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+ 425a) conc="bzcat";;
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+ esac
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+ fi
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+
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+ eval "$cmd $from 2>/dev/null ${conc:+| $conc}"
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+}
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+
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+get_magic_word() {
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+ (get_image "$@" | dd bs=2 count=1 | hexdump -v -n 2 -e '1/1 "%02x"') 2>/dev/null
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+}
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+
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+get_magic_long() {
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+ (get_image "$@" | dd bs=4 count=1 | hexdump -v -n 4 -e '1/1 "%02x"') 2>/dev/null
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+}
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+
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+jffs2_copy_config() {
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+ if grep rootfs_data /proc/mtd >/dev/null; then
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+ # squashfs+jffs2
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+ mtd -e rootfs_data jffs2write "$CONF_TAR" rootfs_data
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+ else
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+ # jffs2
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+ mtd jffs2write "$CONF_TAR" rootfs
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+ fi
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+}
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+
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+default_do_upgrade() {
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+ sync
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+ if [ "$SAVE_CONFIG" -eq 1 ]; then
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+ get_image "$1" | mtd $MTD_CONFIG_ARGS -j "$CONF_TAR" write - "${PART_NAME:-image}"
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+ else
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+ get_image "$1" | mtd write - "${PART_NAME:-image}"
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+ fi
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+}
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+
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+do_upgrade() {
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+ v "Performing system upgrade..."
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+ if type 'platform_do_upgrade' >/dev/null 2>/dev/null; then
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+ platform_do_upgrade "$ARGV"
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+ else
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+ default_do_upgrade "$ARGV"
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+ fi
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+
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+ if [ "$SAVE_CONFIG" -eq 1 ] && type 'platform_copy_config' >/dev/null 2>/dev/null; then
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+ platform_copy_config
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+ fi
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+
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+ v "Upgrade completed"
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+ [ -n "$DELAY" ] && sleep "$DELAY"
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+ ask_bool 1 "Reboot" && {
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+ v "Rebooting system..."
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+ reboot -f
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+ sleep 5
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+ echo b 2>/dev/null >/proc/sysrq-trigger
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+ }
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+}
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