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+# SPDX-License-Identifier: GPL-2.0-or-later
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+
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+RAMFS_COPY_BIN="/usr/sbin/blkid"
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+
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+platform_check_image() {
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+ local board=$(board_name)
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+ local diskdev partdev diff
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+ [ "$#" -gt 1 ] && return 1
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+
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+ v "Board is ${board}"
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+
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+ export_bootdevice && export_partdevice diskdev 0 || {
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+ v "platform_check_image: Unable to determine upgrade device"
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+ return 1
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+ }
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+
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+ get_partitions "/dev/$diskdev" bootdisk
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+
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+ v "Extract boot sector from the image"
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+ get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
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+
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+ get_partitions /tmp/image.bs image
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+
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+ #compare tables
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+ diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
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+
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+ rm -f /tmp/image.bs /tmp/partmap.bootdisk /tmp/partmap.image
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+
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+ if [ -n "$diff" ]; then
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+ v "Partition layout has changed. Full image will be written."
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+ ask_bool 0 "Abort" && exit 1
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+ return 0
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+ fi
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+}
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+
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+platform_copy_config() {
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+ local partdev parttype=ext4
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+
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+ if export_partdevice partdev 2; then
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+ mount -t $parttype -o rw,noatime "/dev/$partdev" /mnt
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+ cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
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+ umount /mnt
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+ else
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+ v "ERROR: Unable to find partition to copy config data to"
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+ fi
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+
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+ sleep 5
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+}
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+
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+# To avoid writing over any firmware
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+# files (e.g ubootefi.var or firmware/X/ aka EBBR)
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+# Copy efi/openwrt and efi/boot from the new image
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+# to the existing ESP
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+platform_do_upgrade_efi_system_partition() {
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+ local image_file=$1
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+ local target_partdev=$2
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+ local image_efisp_start=$3
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+ local image_efisp_size=$4
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+
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+ v "Updating ESP on ${target_partdev}"
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+ NEW_ESP_DIR="/mnt/new_esp_loop"
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+ CUR_ESP_DIR="/mnt/cur_esp"
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+ mkdir "${NEW_ESP_DIR}"
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+ mkdir "${CUR_ESP_DIR}"
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+
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+ get_image_dd "$image_file" of="/tmp/new_efi_sys_part.img" \
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+ skip="$image_efisp_start" count="$image_efisp_size"
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+
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+ mount -t vfat -o loop -o ro /tmp/new_efi_sys_part.img "${NEW_ESP_DIR}"
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+ if [ ! -d "${NEW_ESP_DIR}/efi/boot" ]; then
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+ v "ERROR: Image does not contain EFI boot files (/efi/boot)"
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+ return 1
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+ fi
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+
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+ mount -t vfat "/dev/$partdev" "${CUR_ESP_DIR}"
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+
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+ for d in $(find "${NEW_ESP_DIR}/efi/" -mindepth 1 -maxdepth 1 -type d); do
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+ v "Copying ${d}"
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+ newdir_bname=$(basename "${d}")
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+ rm -rf "${CUR_ESP_DIR}/efi/${newdir_bname}"
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+ cp -r "${d}" "${CUR_ESP_DIR}/efi"
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+ done
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+
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+ umount "${NEW_ESP_DIR}"
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+ umount "${CUR_ESP_DIR}"
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+}
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+
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+platform_do_upgrade() {
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+ local board=$(board_name)
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+ local diskdev partdev diff
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+
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+ export_bootdevice && export_partdevice diskdev 0 || {
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+ v "platform_do_upgrade: Unable to determine upgrade device"
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+ return 1
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+ }
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+
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+ sync
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+
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+ if [ "$UPGRADE_OPT_SAVE_PARTITIONS" = "1" ]; then
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+ get_partitions "/dev/$diskdev" bootdisk
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+
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+ v "Extract boot sector from the image"
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+ get_image_dd "$1" of=/tmp/image.bs count=63 bs=512b
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+
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+ get_partitions /tmp/image.bs image
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+
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+ #compare tables
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+ diff="$(grep -F -x -v -f /tmp/partmap.bootdisk /tmp/partmap.image)"
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+ else
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+ diff=1
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+ fi
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+
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+ # Only change the partition table if sysupgrade -p is set,
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+ # otherwise doing so could interfere with embedded "single storage"
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+ # (e.g SoC boot from SD card) setups, as well as other user
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+ # created storage (like uvol)
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+ if [ -n "$diff" ] && [ "${UPGRADE_OPT_SAVE_PARTITIONS}" = "0" ]; then
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+ # Need to remove partitions before dd, otherwise the partitions
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+ # that are added after will have minor numbers offset
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+ partx -d - "/dev/$diskdev"
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+
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+ get_image_dd "$1" of="/dev/$diskdev" bs=4096 conv=fsync
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+
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+ # Separate removal and addtion is necessary; otherwise, partition 1
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+ # will be missing if it overlaps with the old partition 2
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+ partx -a - "/dev/$diskdev"
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+
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+ return 0
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+ fi
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+
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+ #iterate over each partition from the image and write it to the boot disk
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+ while read part start size; do
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+ if export_partdevice partdev $part; then
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+ v "Writing image to /dev/$partdev..."
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+ if [ "$part" = "1" ]; then
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+ platform_do_upgrade_efi_system_partition \
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+ $1 $partdev $start $size || return 1
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+ else
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+ v "Normal partition, doing DD"
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+ get_image_dd "$1" of="/dev/$partdev" ibs=512 obs=1M skip="$start" \
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+ count="$size" conv=fsync
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+ fi
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+ else
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+ v "Unable to find partition $part device, skipped."
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+ fi
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+ done < /tmp/partmap.image
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+
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+ local parttype=ext4
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+
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+ if (blkid > /dev/null) && export_partdevice partdev 1; then
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+ part_magic_fat "/dev/$partdev" && parttype=vfat
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+ mount -t $parttype -o rw,noatime "/dev/$partdev" /mnt
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+ if export_partdevice partdev 2; then
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+ THIS_PART_BLKID=$(blkid -o value -s PARTUUID "/dev/${partdev}")
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+ v "Setting rootfs PARTUUID=${THIS_PART_BLKID}"
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+ sed -i "s/\(PARTUUID=\)[a-f0-9-]\+/\1${THIS_PART_BLKID}/ig" \
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+ /mnt/efi/openwrt/grub.cfg
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+ fi
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+ umount /mnt
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+ fi
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+ # Provide time for the storage medium to flush before system reset
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+ # (despite the sync/umount it appears NVMe etc. do it in the background)
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+ sleep 5
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+}
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Mathew McBride