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. /lib/functions.sh
REQUIRE_IMAGE_METADATA=1
# copied from x86's platform.sh
platform_check_image() {
local diskdev partdev diff
[ "$#" -gt 1 ] && return 1
export_bootdevice && export_partdevice diskdev -2 || {
echo "Unable to determine upgrade device"
return 1
}
get_partitions "/dev/$diskdev" bootdisk
#extract the boot sector from the image
get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b 2>/dev/null
get_partitions /tmp/image.bs image
#compare tables
diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
if [ -n "$diff" ]; then
echo "Partition layout has changed. Full image will be written."
ask_bool 0 "Abort" && exit 1
return 0
fi
return 0;
}
platform_do_upgrade() {
local diskdev partdev diff
export_bootdevice && export_partdevice diskdev -2 || {
echo "Unable to determine upgrade device"
return 1
}
sync
if [ "$SAVE_PARTITIONS" = "1" ]; then
get_partitions "/dev/$diskdev" bootdisk
#extract the boot sector from the image
get_image "$@" | dd of=/tmp/image.bs count=1 bs=512b
get_partitions /tmp/image.bs image
#compare tables
diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
else
diff=1
fi
if [ -n "$diff" ]; then
get_image "$@" | dd of="/dev/$diskdev" bs=2M conv=fsync
# Separate removal and addtion is necessary; otherwise, partition 1
# will be missing if it overlaps with the old partition 2
partx -d - "/dev/$diskdev"
partx -a - "/dev/$diskdev"
return 0
fi
#iterate over each partition from the image and write it to the boot disk
while read part start size; do
# root is /dev/sd[a|b]2 and not /dev/sd[a|b] this causes some problem
# one of which is this offset, I'm not sure what's the best fix, so
# here's a WA.
let part=$((part - 2))
if export_partdevice partdev $part; then
echo "Writing image to /dev/$partdev..."
get_image "$@" | dd of="/dev/$partdev" ibs="512" obs=1M skip="$start" count="$size" conv=fsync
else
echo "Unable to find partition $part device, skipped."
fi
done < /tmp/partmap.image
#copy partition uuid
echo "Writing new UUID to /dev/$diskdev..."
get_image "$@" | dd of="/dev/$diskdev" bs=1 skip=440 count=4 seek=440 conv=fsync
}
platform_copy_config() {
local partdev
# Same as above /dev/sd[a|b]2 is root, so /boot is -1
if export_partdevice partdev -1; then
mkdir -p /boot
[ -f /boot/kernel.img ] || mount -t vfat -o rw,noatime "/dev/$partdev" /boot
cp -af "$CONF_TAR" /boot/
tar -C / -xvf "$CONF_TAR" boot/config.txt
sync
unmount /boot
fi
}