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144 lines
4.2 KiB
144 lines
4.2 KiB
#!/bin/sh
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###############################################################################
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# Determines the Open Firmware path based on the linux device name
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#
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# Joseph Jezak <josejx@gentoo.org> Copyright (C) 2010
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# Rewrite of OFPath for newer kernels/scsi configurations
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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###############################################################################
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### Set this to 1 to turn on debugging messages
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DEBUG=0
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### Find the device tree
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if [ ! -e /proc/device-tree ]; then
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echo 1>&2 "ofpath: Cannot find the device tree!"
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exit 1
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fi
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DEV_TREE="/proc/device-tree"
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### Check if sys is mounted
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if ! (grep -q '.* .* sysfs ' /proc/mounts 2> /dev/null) ; then
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echo 1>&2 "ofpath: sysfs must be mounted for ofpath to support this system"
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exit 1
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fi
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### Get the sysfs mount point
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SYS="$(m=`grep '.* .* sysfs ' /proc/mounts | head -n 1` ; echo `d=${m#* };echo ${d%% *}`)"
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if [ -z "$SYS" -o ! -d "$SYS" ] ; then
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echo 1>&2 "ofpath: Unable to determine sysfs mountpoint"
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exit 1
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fi
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### Get the device from the user
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### We dereference links to support devices like /dev/cdrom1
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DEVICE=$1
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if [ -z "$DEVICE" ]; then
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echo 1>&2 "ofpath: No device specified!"
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exit 1
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fi
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DEVICE=$(readlink -f "$DEVICE")
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DEVICE=$(basename $DEVICE)
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if [ -z "$DEVICE" ] || [ ! -e "/dev/$DEVICE" ]; then
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echo 1>&2 "ofpath: Invalid device: /dev/$DEVICE"
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exit 1
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fi
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[ "$DEBUG" = 1 ] && echo "Device is: $DEVICE"
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### Get the partition if we have it
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case ${DEVICE} in
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sd*) PARTITION="${DEVICE#sd?}" ;;
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### No partition for sr/sg devices
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sr*|sg*) PARTITION="${DEVICE#sr?}" ;;
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hd*) PARTITION="${DEVICE#hd?}" ;;
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*) echo "Unknown device string."; exit 1;;
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esac
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if [ ! -z "$PARTITION" ] && [ "$DEBUG" = 1 ]; then
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echo "Partition: $PARTITION"
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fi
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### Get the disk device name
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DISK_NAME="${DEVICE%%${PARTITION}}"
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[ "$DEBUG" = 1 ] && echo "Disk Name: $DISK_NAME"
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### Find the devspec for the controller
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DEVPATH=$(cd -P "$SYS/block/${DISK_NAME}/device" && pwd)
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if [ -z "$DEVPATH" ]; then
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echo "Unable to determine device path!"
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exit 1
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fi
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[ "$DEBUG" = 1 ] && echo "Devpath is: $DEVPATH"
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### Get the OF Path of the controller
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case ${DISK_NAME} in
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sd*|sg*|sr*) CONTROLLER_PATH=$(cat ${DEVPATH}/../../../devspec) ;;
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hd*) CONTROLLER_PATH=$(cat ${DEVPATH}/../../devspec) ;;
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*) CONTROLLER_PATH="" ;;
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esac
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if [ -z "$CONTROLLER_PATH" ]; then
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echo "Unable to determine controller path!"
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exit 1
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fi
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[ "$DEBUG" = 1 ] && echo "Controller Path is: $CONTROLLER_PATH"
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### Generate the disk number and partition info
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case ${DISK_NAME} in
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sd*|sg*|sr*)
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DISK_NO="$(cd ${DEVPATH}/../; pwd)";
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DISK_NO="${DISK_NO##*:}";
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;;
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hd*)
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DISK_NO="$(cd ${DEVPATH}/../; pwd)";
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DISK_NO="${DISK_NO##*ide}";
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;;
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*) echo "Unsupported disk type!"; exit 1 ;;
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esac
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DISK_NO="disk@${DISK_NO}:"
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[ "$DEBUG" = 1 ] && echo "Disk Number: ${DISK_NO}"
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### We need to get the controller port path (if it has one)
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if [ ! -d "$DEV_TREE/$CONTROLLER_PATH/disk" ] && [ ! -d "$DEV_TREE/$CONTROLLER_PATH/$DISK_NO" ]; then
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### FIXME I don't know if every scsi device uses the host nomenclature
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case ${DISK_NAME} in
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sd*|sg*|sr*)
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PORT="$(cd ${DEVPATH}/../../; pwd)";
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PORT="${PORT##*host}";
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CTL_PORT="${CONTROLLER_PATH##*/}";
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CTL_PORT="${CTL_PORT%%-root*}";
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PORT="$CTL_PORT@$PORT"
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[ "$DEBUG" = 1 ] && echo "Port: $PORT"
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;;
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*) echo "Unsupported disk type!"; exit 1 ;;
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esac
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fi
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### Add the partition information if required
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if [ ! -z $PARTITION ]; then
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DISK_NO="$DISK_NO$PARTITION"
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fi
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### Build the OF Path
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if [ -z "$PORT" ]; then
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OFPATH="$CONTROLLER_PATH/$DISK_NO"
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else
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OFPATH="$CONTROLLER_PATH/${PORT}/$DISK_NO"
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fi
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### Print out the ofpath
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echo $OFPATH
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