extras/path_id

   1 #!/bin/sh
   2
   3 # provide the shortest possible unique hardware path to a block device
   4 # for the udev persistent disk device naming scheme
   5 #
   6 # Copyright (C) 2005 SUSE Linux Products GmbH
   7 # Author:
   8 #       Hannes Reinecke <hare@suse.de>
   9 #
  10 #       This program is free software; you can redistribute it and/or modify it
  11 #       under the terms of the GNU General Public License as published by the
  12 #       Free Software Foundation version 2 of the License.
  13 #
  14 # to be called from a udev rule to return the name for a symlink
  15 #       DEVPATH=/block/sda/sda3 path_id
  16 #       path_id <devpath>
  17
  18 # example for all block devices on a system:
  19 #       for i in `find /sys/block -name dev` ;do DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`" path_id ; done
  20
  21 # examples:
  22 # SCSI cdrom
  23 # /block/sr0 -> /devices/pci0002:30/0002:30:0c.0/host0/0:0:1:0
  24 # result: pci-0002:30:0c.0-scsi-0:0:1:0
  25 # SCSI disk
  26 # /block/sda -> /devices/pci0002:30/0002:30:0c.0/host0/0:0:4:0
  27 # result: pci-0002:30:0c.0-scsi-0:0:4:0
  28 # SATA disk, 4 channels per controller
  29 # /block/sda -> /devices/pci0001:00/0001:00:07.0/0001:05:0c.0/host0/0:0:0:0
  30 # result: pci-0001:05:0c.0-scsi-0:0:0:0
  31 # IDE disk
  32 # /block/hda -> /devices/pci0002:02/0002:02:0d.0/ide0/0.0
  33 # result: pci-0002:02:0d.0-ide-0.0
  34 # IDE cdrom on a Mac ASIC:
  35 # /block/hdc -> /devices/pci0001:01/0001:01:17.0/0.80000000:mac-io/0.00020000:ata-3/ide1/1.0
  36 # result: mac-io_ata-3_master
  37 # IDE cdrom on a Mac ASIC, with ide-scsi:
  38 # /block/sr0 -> /devices/pci0001:01/0001:01:17.0/0.80000000:mac-io/0.0001f000:ata-4/ide0/0.1/host2/2:0:0:0
  39 # result: mac-io_ata-4_slave
  40
  41 # USB CDrom drive without 'serial' number:
  42 # reusing 'product' and 'manufacturer' string, if available
  43 # /block/sr0 -> /devices/pci0001:00/0001:00:04.0/0001:02:0b.0/usb4/4-2/4-2:1.0/host4/4:0:0:0
  44 # result: usb-storage-odd-Freecom-USIDERev930:0:0:0
  45
  46 # devices may have several interfaces on one PCI device, like IDE:
  47 # pci-0001:00:04.0_ide1-master
  48 # pci-0001:00:04.0_ide2-master
  49 # pci-0001:00:04.0_ide2-slave
  50 # they are marked as ports, it is expected that the driver shows
  51 # ide1 even if there is nothing connected to either master or slave
  52 # interface
  53 #
  54 # match order is important.
  55 # first IDE to find ide-scsi devices.
  56 # then SCSI
  57 # first usb-storage
  58 # then firewire sbp2
  59 # then the rest
  60
  61 SYSFS=/sys
  62 RESULT=1
  63 CDROM=
  64 TYPE=
  65 OPWD="`pwd`"
  66 # Check for 'pwd -P'
  67 if $(pwd -P > /dev/null 2>&1); then
  68     pwd_cmd="pwd -P"
  69 else
  70     pwd_cmd="pwd"
  71 fi
  72 full_sysfs_class_path=
  73 full_sysfs_device_path=
  74
  75 if [ -z "$DEVPATH" -a -z "$1" ] ; then
  76     exit 1
  77 fi
  78
  79 if [ -z "$DEVPATH" ] ; then
  80     case "$1" in
  81         $SYSFS/*)
  82             DEVPATH="${1#$SYSFS}"
  83             ;;
  84         *)
  85             DEVPATH=$1
  86             ;;
  87     esac
  88 fi
  89
  90 if [ ! -d $SYSFS$DEVPATH ] ; then
  91     exit 1
  92 fi
  93 if [ ! -f $SYSFS$DEVPATH/dev ] ; then
  94     exit 1
  95 fi
  96
  97 case "$DEVPATH" in
  98     /block/*)
  99         TYPE=block
 100         ;;
 101     /class/*)
 102         TYPE="${DEVPATH#/class/}"
 103         TYPE="${TYPE%%/*}"
 104         ;;
 105     *)
 106         exit 1
 107         ;;
 108 esac
 109
 110 #
 111 ##
 112 #
 113
 114 get_port () {
 115     local type offset port
 116     type=$1
 117     offset=$2
 118     for i in $type[0-9]* ; do
 119         : i $i
 120         port="${i#$type}"
 121         if [ "$port" -lt "$offset" ] ; then offset=$port ; fi
 122     done
 123     if [ "$port" != "0" ] ; then
 124         echo $(($2 - $offset))
 125     fi
 126 }
 127
 128 handle_block_ide () {
 129 : handle_block_ide $*
 130         local DEV=$1
 131         local port idedev idecontroller
 132         # IDE
 133         : DEV $DEV
 134         d=$DEV
 135         case "$DEV" in
 136         # remove ide-scsi part, leave only channel info
 137                 */ide[0-9]*/host[0-9]*)
 138                 while [ ! -z "$d" ] ; do
 139                         case "$d" in
 140                                 */host[0-9]*)
 141                                 d="${d%/*}"
 142                                 continue
 143                                 ;;
 144                                 *)
 145                                 break
 146                                 ;;
 147                         esac
 148                 done
 149                 ;;
 150         esac
 151         idedev=$d
 152         while [ ! -z "$d" ] ; do
 153                 case "$d" in
 154                         */ide[0-9]*)
 155                         port="${d##*/}"
 156                         d="${d%/*}"
 157                         continue
 158                         ;;
 159                         *)
 160                         break
 161                         ;;
 162                 esac
 163         done
 164         idecontroller=$d
 165         # port info if the controller has more than one interface
 166         port="${port#ide}"
 167         : port $port d $d
 168         : idedev $idedev kernel_port $port
 169         case "${idedev##*.}" in
 170                  0)
 171                  channel=0
 172                  ;;
 173                  1)
 174                  channel=1
 175                  ;;
 176                  *)
 177                  echo "Error: $idedev is neither master or slave" >&2
 178         esac
 179         case "$d" in
 180                 *:mac-io/*)
 181                 : mac-io: $d
 182                 d="`echo $d | sed -e 's@^.*:mac-io[^:]\+:\([^/]\+\).*@mac-io_\1@'`"
 183                 ;;
 184                 /sys/devices)
 185                 # PCMCIA devices
 186                 ifname=${full_sysfs_class_path##*/}
 187                 set -- `sed -n "/$ifname/p" /var/lib/pcmcia/stab`
 188                 d="pcmcia-$1"
 189                 ;;
 190                 *)
 191                 d="pci-${d##*/}"
 192                 # d="`echo $d | sed -e 's@^.*/\([^/]\{1,\}\)/.@pci-\1@'`"
 193                 ;;
 194         esac
 195
 196         cd $idecontroller
 197         port="`get_port ide $port`"
 198         cd "$OPWD"
 199         :  hardware_port $port
 200         if [ -z "$port" ] ; then
 201                 d="${d}-ide-0:$channel"
 202         else
 203                 d="${d}-ide-${port}:$channel"
 204         fi
 205
 206         RESULT=0
 207 }
 208
 209 handle_block_scsi () {
 210 : handle_block_scsi $*
 211         local DEV=$1
 212         local cil controller_port controller_dev
 213         # SCSI device
 214         cil="${DEV##*/}"
 215         cil="${cil#*:}"
 216         controller_dev=$DEV
 217         while [ ! -z "$controller_dev" ] ; do
 218                 case "$controller_dev" in
 219                         */host[0-9]*)
 220                         controller_port=$controller_dev
 221                         controller_dev="${controller_dev%/*}"
 222                         ;;
 223                         *) break ;;
 224                 esac
 225         done
 226         : controller_dev $controller_dev
 227         : controller_port $controller_port
 228         # a host controller may have more than one interface/port
 229         controller_port="${controller_port##*/}"
 230         controller_port="${controller_port##host}"
 231         #
 232         case "$controller_dev" in
 233                 # grand central, old powermacs
 234                 *:gc/*)
 235                 adapter="`echo $controller_dev |  sed -e 's@/[^/]\{1,\}$@@;s@^.*/@@;s@^.*:@@'`"
 236                 bus="gc"
 237                 ;;
 238                 *)
 239                 adapter="${controller_dev##*/}"
 240                 bus="pci"
 241                 ;;
 242         esac
 243         cd "$controller_dev"
 244         controller_port="`get_port host $controller_port`"
 245         cd "$OPWD"
 246         d="$bus-$adapter"
 247         if [ -z "$controller_port" ] ; then
 248                 controller_port=0
 249         fi
 250         d="${d}-scsi-${controller_port}:${cil}"
 251         RESULT=0
 252 }
 253
 254 handle_block_usb_storage () {
 255 : handle_block_usb_storage $*
 256         local DEV=$1
 257         cil="${DEV##*/}"
 258         cil="${cil#*:}"
 259         controller_dev=$DEV
 260         while [ ! -z "$controller_dev" ] ; do
 261                 case "$controller_dev" in
 262                         */host[0-9]*)
 263                         controller_dev="${controller_dev%/*}"
 264                         ;;
 265                         *) break ;;
 266                 esac
 267         done
 268         : controller_dev $controller_dev
 269         #
 270         # usb-storage devs have a serial number, hopefully unique
 271         serial=
 272         if [ -f $controller_dev/../serial ] ; then
 273                 serial="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../serial`"
 274                 : serial XXX_${serial}_XXX
 275                 d="usb-$serial"
 276                 serial="`echo $serial | sed -e 's@[ 0]\{1,\}@@g'`"
 277         fi
 278         if [ -z "$serial" ] ; then
 279                 # no serial, broken device
 280                 # has eventually binary junk in vpd
 281                 identifier=
 282                 if [ -f $controller_dev/../product ] ; then
 283                 product="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../product`"
 284                 fi
 285                 if [ -f $controller_dev/../manufacturer ] ; then
 286                 manufacturer="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../manufacturer`"
 287                 fi
 288                 if [ -z "$product" -o -z "$manufacturer" ] ; then
 289                         read idvendor < $controller_dev/../idVendor
 290                         read idproduct < $controller_dev/../idProduct
 291                         identifier="0x${idvendor}-0x${idproduct}"
 292                 else
 293                         identifier="${manufacturer}-${product}"
 294                 fi
 295                 d="usb-${identifier}"
 296         fi
 297         d="$d:$cil"
 298         RESULT=0
 299
 300
 301 }
 302
 303 handle_block () {
 304     full_sysfs_class_path="$SYSFS$DEVPATH"
 305     if [ ! -f $full_sysfs_class_path/dev ] ; then return ; fi
 306     # the main device has (hopefully) a symlink to the real device
 307     # a partition is a subdir of the main (raw) device
 308     if [ ! -L $full_sysfs_class_path/device ] ; then
 309         if [ -f $full_sysfs_class_path/range ] ; then return ; fi
 310         full_sysfs_class_path="${full_sysfs_class_path%/*}"
 311         : full_sysfs_class_path "$full_sysfs_class_path"
 312         if [ ! -L $full_sysfs_class_path/device -o ! -f $full_sysfs_class_path/dev ] ; then
 313             return
 314         fi
 315     fi
 316     cd $full_sysfs_class_path/device
 317     full_sysfs_device_path="`$pwd_cmd`"
 318     cd "$OPWD"
 319     D=$full_sysfs_device_path
 320     case "$D" in
 321         */ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
 322         handle_block_ide "$D"
 323         ;;
 324         */usb[0-9]*/[0-9]*/host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 325         handle_block_usb_storage "$D"
 326         ;;
 327         */css0/*)
 328         if [ -r $full_sysfs_device_path/wwpn ]; then
 329             read wwpn < $full_sysfs_device_path/wwpn
 330         fi
 331         if [ -r $full_sysfs_device_path/fcp_lun ]; then
 332             read lun < $full_sysfs_device_path/fcp_lun
 333         fi
 334         if [ -r $full_sysfs_device_path/hba_id ]; then
 335             read bus_id < $full_sysfs_device_path/hba_id
 336         fi
 337         if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
 338             # S/390 zfcp adapter
 339             d="ccw-$bus_id-zfcp-$wwpn:$lun"
 340             RESULT=0
 341         else
 342             # DASD devices
 343             bus="ccw"
 344             adapter=${D##*/}
 345             d="$bus-$adapter"
 346             RESULT=0
 347         fi
 348         ;;
 349         */host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 350         # check for ieee1394 sbp2
 351         if test -f $D/ieee1394_id ; then
 352             read ieee1394_id < $D/ieee1394_id
 353             d="`echo ieee1394-${ieee1394_id} | sed -e 's@:@-@g'`"
 354             RESULT=0
 355         else
 356             handle_block_scsi "$D"
 357         fi
 358         ;;
 359
 360         *)
 361         : not handled
 362         RESULT=1
 363         return
 364
 365         ;;
 366     esac
 367     # look for a partition
 368     if [ "$full_sysfs_class_path" != "$SYSFS$DEVPATH" ] ; then
 369         dp="`echo $SYSFS$DEVPATH | sed -e 's@^/.*/@@;s@^[^0-9]\{1,\}@@;s@.*_@@'`"
 370         case "$d" in
 371             *[0-9])
 372             d="${d}p${dp}"
 373             ;;
 374             *)
 375                 d="${d}${dp}"
 376                 ;;
 377         esac
 378     fi
 379     # done
 380     echo "ID_PATH=$d"
 381 }
 382
 383 case "$TYPE" in
 384         block)
 385         handle_block
 386         ;;
 387         *)
 388         RESULT=1
 389         ;;
 390 esac
 391 exit $RESULT