#!/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 $files shift for link in "$@"; 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/jffs && \ 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/jffs /jffs 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 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 $RAM_ROOT /mnt || { echo "Failed to switch over to ramfs. Please reboot." exit 1 } mount -o remount,ro /mnt umount -l /mnt grep /jffs /proc/mounts > /dev/null && { mount -o remount,ro /jffs umount -l /jffs } # spawn a new shell from ramdisk to reduce the probability of cache issues exec /bin/busybox ash -c "$*" } 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"' } 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 sleep 5 echo b 2>/dev/null >/proc/sysrq-trigger } }