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