diff options
| -rw-r--r-- | target/linux/x86/base-files/lib/upgrade/platform.sh | 34 |
1 files changed, 28 insertions, 6 deletions
diff --git a/target/linux/x86/base-files/lib/upgrade/platform.sh b/target/linux/x86/base-files/lib/upgrade/platform.sh index c21f1a7e5f..f12deebf64 100644 --- a/target/linux/x86/base-files/lib/upgrade/platform.sh +++ b/target/linux/x86/base-files/lib/upgrade/platform.sh @@ -61,7 +61,27 @@ get_partitions() { # <device> <filename> if [ -b "$disk" -o -f "$disk" ]; then echo "Reading partition table from $filename..." - partx -r "$disk" -gbo NR,START,SECTORS > "/tmp/partx.$filename" + + local magic="$(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 } @@ -76,9 +96,11 @@ platform_do_upgrade() { #get block size - sectors="$(partx -r $disk -gbo SECTORS --nr 1:1)" - size="$(partx -r $disk -gbo SIZE --nr 1:1)" - ibs="$(($size / $sectors))" + if [ -f "/sys/block/${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 "$@" | dd of=/tmp/image.bs count=1 bs=512b @@ -86,7 +108,7 @@ platform_do_upgrade() { get_partitions /tmp/image.bs image #compare tables - diff="$(grep -F -x -v -f /tmp/partx.bootdisk /tmp/partx.image)" + 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 @@ -99,7 +121,7 @@ platform_do_upgrade() { 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/partx.image + done < /tmp/partmap.image #copy partition uuid echo "Writing new UUID to $disk$part..." |