#!/bin/bash

TFTP_DIR=/home/district10/tftp-boot
BOOT_LINK=uImage

USER_TAG=$USER
if [ ! -z "$SUDO_USER" ]
then
    USER_TAG=$SUDO_USER
fi

MAKE_ACTIVE=

function die()
{
	echo " (EE) $1"
	exit 1
}

function info()
{
	echo " (II) $1"
}

function silent()
{
	OUTPUT=`$*`
	if [ "$?" != "0" ]; then
		echo $OUTPUT
		die "$* failed!"
	fi
}

function usage()
{
    cat <<EOF
Usage: install_kernel.district10 [--activate]

Options:
  --activate   Point uImage symlink to newly installed kernel.

Note: must be invoked in kernel src directory.
EOF
}

while [ ! -z "$1" ]
do
    case $1 in
	--activate)
	    shift
	    MAKE_ACTIVE=yes
	    ;;
	--help|-h)
	    usage
	    exit 0
	    ;;
	*) # unknown argument
	    echo "Unknown argument $1"
	    usage
	    exit 1
	    ;;
    esac
done


if [ ! -f "./.config" ]; then
	CURDIR=`pwd`
	die "No kernel .config exists in $CURDIR!"
fi

if [ ! -f "./Makefile" ]; then
	die "No Makefile present!"
fi

NAME=`cat include/config/kernel.release`
NAME=${NAME/%\+/} # remove trailing '+' (if any)

if [ -z "$NAME" ]
then
    die "Could not determine kernel version!"
fi

info "Detected kernel version $NAME"

if [ $UID != "0" ]; then
    die "Must be root to install kernel!"
fi

if [ ! -d "$TFTP_DIR" ]
then
    die "TFTP directory $TFTP_DIR does not exist. Is the NFS root mounted?"
fi

KERNEL="uimage-${USER_TAG}-${NAME}"
UIMAGE="${TFTP_DIR}/$KERNEL"
CONFIG="${UIMAGE}.config"
SYSMAP="${UIMAGE}.System.map"

# (1) Copy kernel
info "Copy uImage to $UIMAGE"
silent cp -v arch/arm/boot/uImage "$UIMAGE"

# (2) .config
info "Copy .config to $CONFIG"
silent cp -v .config "$CONFIG"

# (3) System.map
info "Copy System.map to $SYSMAP"
silent cp -v System.map "$SYSMAP"

if [ -n "$MAKE_ACTIVE" ]
then
    info "Pointing kernel symlink $BOOT_LINK to $KERNEL"
    cd "$TFTP_DIR"
    [ -L "$BOOT_LINK" ] || die "expected $BOOT_LINK in $TFTP_DIR to be a symbolic link."
    silent rm "$BOOT_LINK"
    silent ln -s "$KERNEL" "$BOOT_LINK"
fi