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|
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() { # <device> <filename>
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
}
|
