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Use direct I/O for SPL update (#1408)

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The rauc hook for the spl slotclass writes to the disk directly. Make
sure the changes do not end up in cache in case the device looses power
or is otherwise not properly rebooted.

Also use the same partition label detection we are using in
hassos-expand.
This commit is contained in:
Stefan Agner 2021-06-14 11:27:03 +02:00 committed by GitHub
parent cfb68c5b39
commit 9bf12a8648
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1 changed files with 6 additions and 4 deletions
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10
buildroot-external/ota/rauc-hook
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@ -63,12 +63,14 @@ fi
if [ "${RAUC_SLOT_CLASS}" = "spl" ]; then
DEVICE_CHILD="$(findfs LABEL="hassos-boot")"
DEVICE_ROOT="/dev/$(lsblk -no pkname "${DEVICE_CHILD}")"
PART_TABLE="$(sfdisk -lqJ "${DEVICE_ROOT}")"
PART_LABEL="$(echo "${PART_TABLE}" | jq -r '.partitiontable.label')"
if sfdisk -dq "${DEVICE_ROOT}" | grep -q 'label: gpt'; then
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc bs=512 seek=2 skip=2
if [ "${PART_LABEL}" = "gpt" ]; then
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc oflag=direct bs=512 seek=2 skip=2
else
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc bs=1 count=440
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc bs=512 seek=1 skip=1
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc oflag=direct bs=1 count=440
dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc oflag=direct bs=512 seek=1 skip=1
fi
fi