#!/sbin/runscript

# GOALS
# -----
# 1. handle both devfs and non-devfs systems (bug #35273)
# 2. handle systems without discs or cdroms (bug #20816)
# 3. handle ide-scsi devices (bug #35458)
# 4. don't mistakenly run hdparm on non-ide devices (bug #16848)
#
# 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.


HDPARM=/sbin/hdparm


depend() {
    # need localmount
    # no, we don't need localmount
    use hotplug
    before *
}

do_hdparm() {
    if [[ -n $args ]]
    then
        ebegin "Running hdparm on $device"
        $HDPARM -q $args $device || ewarn "Failed to run hdparm on $device"
    fi
}

start() {

    ebegin "Starting hdparm"

    [[ -x $HDPARM ]]
    eend $? "$HDPARM executable not found"

    if [[ -d /dev/ide ]]
    then

        # devfs system

        for device in $(find /dev/ide -type b -name disc)
        do

            args=$all_args

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

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

            do_hdparm

        done

        for device in $(find /dev/ide -type b -name cd)
        do

            args=$all_args

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

            for alias in /dev/cdroms/*
            do
                if [[ $alias -ef $device ]]
                then
                    device=$alias
                    eval args=\${`basename $alias`_args:-$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 $(find /dev/ide -type b -name generic | sort)
        do
            eval args=\${generic${count}_args:-$all_args}
            do_hdparm
            let count=count+1
        done

    else

        # non-devfs 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 $device`_args:-$all_args}
                do_hdparm
            fi
        done

    fi
}