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x86: make sysupgrade work without partx

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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
This commit is contained in:
Jo-Philipp Wich 2016-03-30 03:10:51 +02:00
parent fa69553900
commit 9f422eba7c
1 changed files with 28 additions and 6 deletions
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34
target/linux/x86/base-files/lib/upgrade/platform.sh
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@ -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..."