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-rw-r--r--target/linux/x86/base-files/lib/upgrade/platform.sh34
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..."