OpenWrt – Rev 1

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platform_check_image() {
        local diskdev partdev diff

        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
}

platform_copy_config() {
        local partdev

        if export_partdevice partdev -1; then
                mount -t vfat -o rw,noatime "/dev/$partdev" /mnt
                cp -af "$CONF_TAR" /mnt/
                umount /mnt
        fi
}

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=4096 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

        #write uboot image
        get_image "$@" | dd of="$diskdev" bs=1024 skip=8 seek=8 count=1016 conv=fsync
        #iterate over each partition from the image and write it to the boot disk
        while read part start size; do
                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
}