OpenWrt – Rev 4

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#
# Copyright (C) 2014 OpenWrt.org
#

platform_get_rootfs() {
        local rootfsdev

        if read cmdline < /proc/cmdline; then
                case "$cmdline" in
                        *block2mtd=*)
                                rootfsdev="${cmdline##*block2mtd=}"
                                rootfsdev="${rootfsdev%%,*}"
                        ;;
                        *root=*)
                                rootfsdev="${cmdline##*root=}"
                                rootfsdev="${rootfsdev%% *}"
                        ;;
                esac

                echo "${rootfsdev}"
        fi
}

platform_copy_config() {
        case "$(board_name)" in
        erlite)
                mount -t vfat /dev/sda1 /mnt
                cp -af "$CONF_TAR" /mnt/
                umount /mnt
                ;;
        esac
}

platform_do_flash() {
        local tar_file=$1
        local board=$2
        local kernel=$3
        local rootfs=$4

        mkdir -p /boot
        mount -t vfat /dev/$kernel /boot

        [ -f /boot/vmlinux.64 -a ! -L /boot/vmlinux.64 ] && {
                mv /boot/vmlinux.64 /boot/vmlinux.64.previous
                mv /boot/vmlinux.64.md5 /boot/vmlinux.64.md5.previous
        }

        echo "flashing kernel to /dev/$kernel"
        tar xf $tar_file sysupgrade-$board/kernel -O > /boot/vmlinux.64
        md5sum /boot/vmlinux.64 | cut -f1 -d " " > /boot/vmlinux.64.md5
        echo "flashing rootfs to ${rootfs}"
        tar xf $tar_file sysupgrade-$board/root -O | dd of="${rootfs}" bs=4096
        sync
        umount /boot
}

platform_do_upgrade() {
        local tar_file="$1"
        local board=$(board_name)
        local rootfs="$(platform_get_rootfs)"
        local kernel=

        [ -b "${rootfs}" ] || return 1
        case "$board" in
        erlite)
                kernel=sda1
                ;;
        er)
                kernel=mmcblk0p1
                ;;
        *)
                return 1
        esac

        platform_do_flash $tar_file $board $kernel $rootfs

        return 0
        
}

platform_check_image() {
        local board=$(board_name)

        case "$board" in
        erlite | \
        er)
                local tar_file="$1"
                local kernel_length=`(tar xf $tar_file sysupgrade-$board/kernel -O | wc -c) 2> /dev/null`
                local rootfs_length=`(tar xf $tar_file sysupgrade-$board/root -O | wc -c) 2> /dev/null`
                [ "$kernel_length" = 0 -o "$rootfs_length" = 0 ] && {
                        echo "The upgarde image is corrupt."
                        return 1
                }
                return 0
                ;;
        esac

        echo "Sysupgrade is not yet supported on $board."
        return 1
}