#!/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() {
	if [[ ${args:=$all_args} ]]
	then
		orgdevice=`readlink -f $device`
		if [ -b $orgdevice ]; then
			ebegin "Running hdparm on $device"
			hdparm $args $device > /dev/null || ewarn "Failed to run hdparm on $device"
		fi
	fi
}

start() {

	ebegin 'Starting hdparm'

	which hdparm &>/dev/null
	eend $? 'hdparm executable not found'

	if [ -d /dev/ide ]
	then

		# 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

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

			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

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

			do_hdparm

		done

		let 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
			let count=count+1
		done

	else

		# non-devfs compatible system
		for device in /dev/hd?
		do
			# check that the block device really exists
			# by opening it for reading
			if [ -b $device ] && ( : <$device ) 2>/dev/null
			then
				eval args=\${`basename $device`_args}
				do_hdparm
			fi
		done

	fi
}