- 

### update action ###

describe_update() {

	echo "Update the kernel symlink to running kernel"

}

describe_update_options() {

	echo "ifunset: Do not override currently set version"

}

do_update() {

	[[ -z $1 || $1 == ifunset ]] || die -q "Usage error"

	[[ $# -gt 1 ]] && die -q "Too many parameters"

	test_for_root

	if [[ -e ${EROOT}/usr/src/linux && ! -L ${EROOT}/usr/src/linux ]]; then

		# we have something strange

		die -q "${EROOT}/usr/src/linux exists but is not a symlink"

	fi

	if [[ $1 == ifunset \

			  && -L ${EROOT}/usr/src/linux \

			  && -e ${EROOT}/usr/src/linux ]]; then

		# The /usr/src/linux symlink exists, points to a path that

		# exists, and 'ifunset' is provided. Nothing to do.

		return

	fi

	local targets=( $(find_targets) )

	local running_kernel_release=$(uname --kernel-release)

	local running_kernel_symlink_target="linux-${running_kernel_release}"

	if [[ -L ${EROOT}/usr/src/linux ]]; then

		local current_target

		current_target=$(basename "$(canonicalise "${EROOT}/usr/src/linux")")

		if [[ ${current_target} == ${running_kernel_symlink_target} ]]; then

			# The /usr/src/linux symlink already points to the running

			# kernel's sources. Nothing to do.

			return

		fi

	fi

	local target

	local target_list=()

	for target in ${targets[@]}; do

		if [[ ${target} == ${current_kernel_symlink_target} ]]; then

			set_symlink "${target}"

			return

		fi

		target_list+=("- ${target}\n")

	done

	local msg

	msg="No kernel sources for running kernel ${running_kernel_release} found."

	msg+=" Available sources:\n${target_list[@]}"

	die -q "${msg}"

}

### helper functions ###

test_for_root() {

	[[ -w ${EROOT}/usr/src ]] || die -q "${EROOT}/usr/src not writeable by current user. Are you root?"

}