#!/sbin/runscript
# METHOD
# ------
# if /dev/ide exists, find all block devices beneath it named disc, cd, or
# generic.
#
# for the disc and cd ones, if there is a a matching /dev/hdX symlink and
# hdX_args is set in the config file, use hdX_args.  otherwise, if there is a
# matching /dev/discs/discX or /dev/cdroms/cdromX symlink, and discX_args or
# cdromX_args is set in the config file, use discX_args / cdromX_args.  finally,
# if all_args is set in the config file, use that.
#
# for the generic ones, sort them and look for genericX_args in the config file
# or use all_args.
#
# if /dev/ide does not exist, check the /dev/hdX entries, and see which ones
# correspond to real devices by opening them for reading.  then check hdX_args
# and all_args in the config file.
#
# for each device considered, if no args are found in the config file, do not
# run hdparm.

depend() {
	before bootmisc
}

do_hdparm() {
	local e=
	eval e=\$${extra_args}
	[ -z "${args}${all_args}${e}" ] && return 0
	
	if [ -n "${args:=${all_args} ${e}}" ] ; then
		local orgdevice=$(readlink -f "${device}")
		if [ -b "${orgdevice}" ] ; then
			ebegin "Running hdparm on ${device}"
			hdparm ${args} "${device}" > /dev/null
			eend $?
		fi
	fi
}

scan_devfs() {
	local extra_args="pata_all_args" device= alias= args=

	# devfs compatible systems
	for device in $(find /dev/ide -name disc) ; do
		args=''

		for alias in /dev/hd? ; do
			if [ "${alias}" -ef "${device}" ] ; then
				device=${alias}
				eval args=\$"$(basename "${alias}")"_args
				break
			fi
		done

		if [ -z "$args" ] ; then
			for alias in /dev/discs/* ; do
				if [ "${alias}"/disc -ef "${device}" ]; then
					device="${alias}/disc"
					eval args=\$"$(basename "${alias}")"_args
					break
				fi
			done
		fi

		do_hdparm
	done

	for device in $(find /dev/ide -name cd) ; do
		args=''

		for alias in /dev/hd? ; do
			if [ "${alias}" -ef "${device}" ] ; then
				device=${alias}
				eval args=\$"$(basename "${alias}")"_args
				break
			fi
		done

		if [ -z "$args" ] ; then
			for alias in /dev/cdroms/* ; do
				if [ "${alias}" -ef "${device}" ] ; then
					device=${alias}
					eval args=\$"$(basename "${alias}")"_args
					break
				fi
			done
		fi

		do_hdparm
	done

	local count=0
	# of course, the sort approach would fail here if any of the
	# host/bus/target/lun numbers reached 2 digits..
	for device in $(find /dev/ide -name generic | sort) ; do
		eval args=\$generic${count}_args
		do_hdparm
		count=$((${count} + 1))
	done
}

scan_nondevfs() {
	# non-devfs compatible system
	for device in /dev/hd* /dev/sd* ; do
		[ -e "${device}" ] || continue
		case "${device}" in
			*[0-9]) continue ;;
			/dev/hd*)  extra_args="pata_all_args" ;;
			/dev/sd*)  extra_args="sata_all_args" ;;
			*)         extra_args="" ;;
		esac

		# check that the block device really exists by
		# opening it for reading
		local errmsg= status= nomed=1
		errmsg=$(export LC_ALL=C ; : 2>&1 <"${device}")
		status=$?
		case ${errmsg} in
		    *": No medium found") nomed=0;;
		esac
		if [ -b "${device}" ] && [ "${status}" = "0" -o "${nomed}" = "0" ] ; then
			local conf_var="${device##*/}_args"
			eval args=\$${conf_var}
			do_hdparm
		fi
	done
}

start() {
	if get_bootparam "nohdparm" ; then
		ewarn "Skipping hdparm init as requested in kernel cmdline"
		return 0
	fi

	if [ -e /dev/.devfsd -a -d /dev/ide ] ; then
		scan_devfs
	else
		scan_nondevfs
	fi
}