platform_export_bootpart() { local cmdline uuid disk if read cmdline < /proc/cmdline; then case "$cmdline" in *block2mtd=*) disk="${cmdline##*block2mtd=}" disk="${disk%%,*}" ;; *root=*) disk="${cmdline##*root=}" disk="${disk%% *}" ;; esac case "$disk" in PARTUUID=[a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9][a-f0-9]-02) uuid="${disk#PARTUUID=}" uuid="${uuid%-02}" for disk in /dev/*; do [ -b "$disk" ] || continue set -- $(dd if=$disk bs=1 skip=440 count=4 2>/dev/null | hexdump -v -e '4/1 "%02x "') if [ "$4$3$2$1" = "$uuid" ]; then export BOOTPART="${disk}1" return 0 fi done ;; /dev/*) export BOOTPART="${disk%[0-9]}1" return 0 ;; esac fi return 1 } platform_check_image() { [ "$#" -gt 1 ] && return 1 case "$(get_magic_word "$1")" in eb48|eb63) return 0;; *) echo "Invalid image type" return 1 ;; esac } platform_copy_config() { if [ -b "$BOOTPART" ]; then mount -t ext4 -o rw,noatime "$BOOTPART" /mnt cp -af "$CONF_TAR" /mnt/ umount /mnt fi } get_partitions() { # local disk="$1" local filename="$2" if [ -b "$disk" -o -f "$disk" ]; then echo "Reading partition table from $filename..." local magic="$(hexdump -v -n 2 -s 0x1FE -e '1/2 "0x%04X"' "$disk")" if [ "$magic" != 0xAA55 ]; then echo "Invalid partition table on $disk" exit fi rm -f "/tmp/partmap.$filename" local part for part in 1 2 3 4; do set -- $(hexdump -v -n 12 -s "$((0x1B2 + $part * 16))" -e '3/4 "0x%08X "' "$disk") local type="$(($1 % 256))" local lba="$(($2))" local num="$(($3))" [ $type -gt 0 ] || continue printf "%2d %5d %7d\n" $part $lba $num >> "/tmp/partmap.$filename" done fi } platform_do_upgrade() { platform_export_bootpart disk="${BOOTPART%[0-9]}" if [ -b "$disk" ]; then sync if [ "$SAVE_PARTITIONS" = "1" ]; then get_partitions "$disk" bootdisk #get block size if [ -f "/sys/block/${disk##*/}/queue/physical_block_size" ]; then ibs="$(cat "/sys/block/${disk##*/}/queue/physical_block_size")" else ibs=512 fi #extract the boot sector from the image get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b get_partitions /tmp/image.bs image #compare tables diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)" if [ -n "$diff" ]; then echo "Partition layout is changed. Full image will be written." ask_bool 0 "Abort" && exit get_image "$@" | dd of="$disk" bs=4096 conv=fsync return 0 fi #iterate over each partition from the image and write it to the boot disk while read part start size; do echo "Writing image to $disk$part..." get_image "$@" | dd of="$disk$part" ibs="$ibs" obs=1M skip="$start" count="$size" conv=fsync done < /tmp/partmap.image #copy partition uuid echo "Writing new UUID to $disk$part..." get_image "$@" | dd of="$disk" bs=1 skip=440 count=4 seek=440 conv=fsync else get_image "$@" | dd of="$disk" bs=4096 conv=fsync fi sleep 1 fi }