Change handling for SPL based images (#578)

* Change handling for SPL based images

* Fix script

* Fix path for rauc-hook

buildroot-external/ota/rauc-hook

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+##
+# Hooks
+
+# Handle boot hocks
+if [ "${RAUC_SLOT_CLASS}" = "boot" ]; then
+    BOOT_DATA=/tmp/boot-data
+
+    mkdir -p ${BOOT_DATA}
+    if [ "${1}" = "slot-pre-install" ]; then
+        cp -f ${RAUC_SLOT_MOUNT_POINT}/*.txt ${BOOT_DATA}/
+    elif [ "${1}" = "slot-post-install" ]; then
+        cp -f ${BOOT_DATA}/*.txt ${RAUC_SLOT_MOUNT_POINT}/
+    fi
+fi
+
+# Handle spl install
+if [ "${RAUC_SLOT_CLASS}" = "spl" ]; then
+    DEVICE_CHILD="$(findfs LABEL="hassos-boot")"
+    DEVICE_ROOT="/dev/$(lsblk -no pkname ${DEVICE_CHILD})"
+
+    if sfdisk -dq ${DEVICE_ROOT} | grep -q 'label: gpt'; then
+        dd if=${RAUC_IMAGE_NAME} of=${DEVICE_ROOT} conv=notrunc bs=512 seek=2 skip=2
+    else
+        dd if=${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
+    fi
+fi
+
+##
+# Fixups
+
+
+exit 0