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 # Licensed under the GPL v2.
   8 #
   9 # to be called from a udev rule to return the name for a symlink
  10 # DEVPATH=/block/sda/sda3 $0  (or similar)
  11 # $0 /block/sda
  12 # $0 /sys/block/sda
  13
  14 # example for all:
  15 # for i in `find /sys/block -name dev` ;do DEVPATH="`echo $i | sed -e 's@^/sys\|/dev@@g'`" $0 ; done
  16
  17 # examples:
  18 # SCSI cdrom
  19 # /block/sr0 -> /devices/pci0002:30/0002:30:0c.0/host0/0:0:1:0
  20 # result: pci-0002:30:0c.0-scsi-0:0:1:0
  21 # SCSI disk
  22 # /block/sda -> /devices/pci0002:30/0002:30:0c.0/host0/0:0:4:0
  23 # result: pci-0002:30:0c.0-scsi-0:0:4:0
  24 # SATA disk, 4 channels per controller
  25 # /block/sda -> /devices/pci0001:00/0001:00:07.0/0001:05:0c.0/host0/0:0:0:0
  26 # result: pci-0001:05:0c.0-scsi-0:0:0:0
  27 # IDE disk
  28 # /block/hda -> /devices/pci0002:02/0002:02:0d.0/ide0/0.0
  29 # result: pci-0002:02:0d.0-ide-0.0
  30 # IDE cdrom on a Mac ASIC:
  31 # /block/hdc -> /devices/pci0001:01/0001:01:17.0/0.80000000:mac-io/0.00020000:ata-3/ide1/1.0
  32 # result: mac-io_ata-3_master
  33 # IDE cdrom on a Mac ASIC, with ide-scsi:
  34 # /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
  35 # result: mac-io_ata-4_slave
  36
  37 # USB CDrom drive without 'serial' number:
  38 # reusing 'product' and 'manufacturer' string, if available
  39 # /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
  40 # result: usb-storage-odd-Freecom-USIDERev930:0:0:0
  41
  42 # devices may have several interfaces on one PCI device, like IDE:
  43 # pci-0001:00:04.0_ide1-master
  44 # pci-0001:00:04.0_ide2-master
  45 # pci-0001:00:04.0_ide2-slave
  46 # they are marked as ports, it is expected that the driver shows
  47 # ide1 even if there is nothing connected to either master or slave
  48 # interface
  49 #
  50 # match order is important.
  51 # first IDE to find ide-scsi devices.
  52 # then SCSI
  53 # first usb-storage
  54 # then firewire sbp2
  55 # then the rest
  56
  57 SYSFS=/sys
  58 RESULT=1
  59 CDROM=
  60 TYPE=
  61 OPWD="`pwd`"
  62 # Check for 'pwd -P'
  63 if $(pwd -P > /dev/null 2>&1); then
  64     pwd_cmd="pwd -P"
  65 else
  66     pwd_cmd="pwd"
  67 fi
  68 full_sysfs_class_path=
  69 full_sysfs_device_path=
  70
  71 if [ -z "$DEVPATH" -a -z "$1" ] ; then
  72     exit 1
  73 fi
  74
  75 if [ -z "$DEVPATH" ] ; then
  76     case "$1" in
  77         $SYSFS/*)
  78             DEVPATH="${1#$SYSFS}"
  79             ;;
  80         *)
  81             DEVPATH=$1
  82             ;;
  83     esac
  84 fi
  85
  86 if [ ! -d $SYSFS$DEVPATH ] ; then
  87     exit 1
  88 fi
  89 if [ ! -f $SYSFS$DEVPATH/dev ] ; then
  90     exit 1
  91 fi
  92
  93 case "$DEVPATH" in
  94     /block/*)
  95         TYPE=block
  96         ;;
  97     /class/*)
  98         TYPE="${DEVPATH#/class/}"
  99         TYPE="${TYPE%%/*}"
 100         ;;
 101     *)
 102         exit 1
 103         ;;
 104 esac
 105
 106 #
 107 ##
 108 #
 109
 110 get_port () {
 111     local type offset port
 112     type=$1
 113     offset=$2
 114     for i in $type[0-9]* ; do
 115         : i $i
 116         port="${i#$type}"
 117         if [ "$port" -lt "$offset" ] ; then offset=$port ; fi
 118     done
 119     if [ "$port" != "0" ] ; then
 120         echo $(($2 - $offset))
 121     fi
 122 }
 123
 124 handle_block_ide () {
 125 : handle_block_ide $*
 126         local DEV=$1
 127         local port idedev idecontroller
 128         # IDE
 129         : DEV $DEV
 130         d=$DEV
 131         case "$DEV" in
 132         # remove ide-scsi part, leave only channel info
 133                 */ide[0-9]*/host[0-9]*)
 134                 while [ ! -z "$d" ] ; do
 135                         case "$d" in
 136                                 */host[0-9]*)
 137                                 d="${d%/*}"
 138                                 continue
 139                                 ;;
 140                                 *)
 141                                 break
 142                                 ;;
 143                         esac
 144                 done
 145                 ;;
 146         esac
 147         idedev=$d
 148         while [ ! -z "$d" ] ; do
 149                 case "$d" in
 150                         */ide[0-9]*)
 151                         port="${d##*/}"
 152                         d="${d%/*}"
 153                         continue
 154                         ;;
 155                         *)
 156                         break
 157                         ;;
 158                 esac
 159         done
 160         idecontroller=$d
 161         # port info if the controller has more than one interface
 162         port="${port#ide}"
 163         : port $port d $d
 164         : idedev $idedev kernel_port $port
 165         case "${idedev##*.}" in
 166                  0)
 167                  channel=0
 168                  ;;
 169                  1)
 170                  channel=1
 171                  ;;
 172                  *)
 173                  echo "Error: $idedev is neither master or slave" >&2
 174         esac
 175         case "$d" in
 176                 *:mac-io/*)
 177                 : mac-io: $d
 178                 d="`echo $d | sed -e 's@^.*:mac-io[^:]\+:\([^/]\+\).*@mac-io_\1@'`"
 179                 ;;
 180                 /sys/devices)
 181                 # PCMCIA devices
 182                 ifname=${full_sysfs_class_path##*/}
 183                 set -- `sed -n "/$ifname/p" /var/lib/pcmcia/stab`
 184                 d="pcmcia-$1"
 185                 ;;
 186                 *)
 187                 d="pci-${d##*/}"
 188                 # d="`echo $d | sed -e 's@^.*/\([^/]\{1,\}\)/.@pci-\1@'`"
 189                 ;;
 190         esac
 191
 192         cd $idecontroller
 193         port="`get_port ide $port`"
 194         cd "$OPWD"
 195         :  hardware_port $port
 196         if [ -z "$port" ] ; then
 197                 d="${d}-ide-0:$channel"
 198         else
 199                 d="${d}-ide-${port}:$channel"
 200         fi
 201
 202         RESULT=0
 203 }
 204
 205 handle_block_scsi () {
 206 : handle_block_scsi $*
 207         local DEV=$1
 208         local cil controller_port controller_dev
 209         # SCSI device
 210         cil="${DEV##*/}"
 211         cil="${cil#*:}"
 212         controller_dev=$DEV
 213         while [ ! -z "$controller_dev" ] ; do
 214                 case "$controller_dev" in
 215                         */host[0-9]*)
 216                         controller_port=$controller_dev
 217                         controller_dev="${controller_dev%/*}"
 218                         ;;
 219                         *) break ;;
 220                 esac
 221         done
 222         : controller_dev $controller_dev
 223         : controller_port $controller_port
 224         # a host controller may have more than one interface/port
 225         controller_port="${controller_port##*/}"
 226         controller_port="${controller_port##host}"
 227         #
 228         case "$controller_dev" in
 229                 # grand central, old powermacs
 230                 *:gc/*)
 231                 adapter="`echo $controller_dev |  sed -e 's@/[^/]\{1,\}$@@;s@^.*/@@;s@^.*:@@'`"
 232                 bus="gc"
 233                 ;;
 234                 *)
 235                 adapter="${controller_dev##*/}"
 236                 bus="pci"
 237                 ;;
 238         esac
 239         cd "$controller_dev"
 240         controller_port="`get_port host $controller_port`"
 241         cd "$OPWD"
 242         d="$bus-$adapter"
 243         if [ -z "$controller_port" ] ; then
 244                 controller_port=0
 245         fi
 246         d="${d}-scsi-${controller_port}:${cil}"
 247         RESULT=0
 248 }
 249
 250 handle_block_usb_storage () {
 251 : handle_block_usb_storage $*
 252         local DEV=$1
 253         cil="${DEV##*/}"
 254         cil="${cil#*:}"
 255         controller_dev=$DEV
 256         while [ ! -z "$controller_dev" ] ; do
 257                 case "$controller_dev" in
 258                         */host[0-9]*)
 259                         controller_dev="${controller_dev%/*}"
 260                         ;;
 261                         *) break ;;
 262                 esac
 263         done
 264         : controller_dev $controller_dev
 265         #
 266         # usb-storage devs have a serial number, hopefully unique
 267         serial=
 268         if [ -f $controller_dev/../serial ] ; then
 269                 serial="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../serial`"
 270                 : serial XXX_${serial}_XXX
 271                 d="usb-$serial"
 272                 serial="`echo $serial | sed -e 's@[ 0]\{1,\}@@g'`"
 273         fi
 274         if [ -z "$serial" ] ; then
 275                 # no serial, broken device
 276                 # has eventually binary junk in vpd
 277                 identifier=
 278                 if [ -f $controller_dev/../product ] ; then
 279                 product="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../product`"
 280                 fi
 281                 if [ -f $controller_dev/../manufacturer ] ; then
 282                 manufacturer="`sed -e 's@^[ -]\{1,\}\|[ -]\{1,\}$@@g;s@[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ-_0123456789]@@g' < $controller_dev/../manufacturer`"
 283                 fi
 284                 if [ -z "$product" -o -z "$manufacturer" ] ; then
 285                         read idvendor < $controller_dev/../idVendor
 286                         read idproduct < $controller_dev/../idProduct
 287                         identifier="0x${idvendor}-0x${idproduct}"
 288                 else
 289                         identifier="${manufacturer}-${product}"
 290                 fi
 291                 d="usb-${identifier}"
 292         fi
 293         d="$d:$cil"
 294         RESULT=0
 295
 296
 297 }
 298
 299 handle_block () {
 300     full_sysfs_class_path="$SYSFS$DEVPATH"
 301     if [ ! -f $full_sysfs_class_path/dev ] ; then return ; fi
 302     # the main device has (hopefully) a symlink to the real device
 303     # a partition is a subdir of the main (raw) device
 304     if [ ! -L $full_sysfs_class_path/device ] ; then
 305         if [ -f $full_sysfs_class_path/range ] ; then return ; fi
 306         full_sysfs_class_path="${full_sysfs_class_path%/*}"
 307         : full_sysfs_class_path "$full_sysfs_class_path"
 308         if [ ! -L $full_sysfs_class_path/device -o ! -f $full_sysfs_class_path/dev ] ; then
 309             return
 310         fi
 311     fi
 312     cd $full_sysfs_class_path/device
 313     full_sysfs_device_path="`$pwd_cmd`"
 314     cd "$OPWD"
 315     D=$full_sysfs_device_path
 316     case "$D" in
 317         */ide[0-9]/[0-9].[0-9]*|*/ide[0-9][0-9]/[0-9][0-9].[0-9]*)
 318         handle_block_ide "$D"
 319         ;;
 320         */usb[0-9]*/[0-9]*/host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 321         handle_block_usb_storage "$D"
 322         ;;
 323         */css0/*)
 324         if [ -r $full_sysfs_device_path/wwpn ]; then
 325             read wwpn < $full_sysfs_device_path/wwpn
 326         fi
 327         if [ -r $full_sysfs_device_path/fcp_lun ]; then
 328             read lun < $full_sysfs_device_path/fcp_lun
 329         fi
 330         if [ -r $full_sysfs_device_path/hba_id ]; then
 331             read bus_id < $full_sysfs_device_path/hba_id
 332         fi
 333         if [ "$bus_id" -a "$wwpn" -a "$lun" ]; then
 334             # S/390 zfcp adapter
 335             d="ccw-$bus_id-zfcp-$wwpn:$lun"
 336             RESULT=0
 337         else
 338             # DASD devices
 339             bus="ccw"
 340             adapter=${D##*/}
 341             d="$bus-$adapter"
 342             RESULT=0
 343         fi
 344         ;;
 345         */host[0-9]*/[0-9]*:[0-9]*:[0-9]*:[0-9]*)
 346         # check for ieee1394 sbp2
 347         if test -f $D/ieee1394_id ; then
 348             read ieee1394_id < $D/ieee1394_id
 349             d="`echo ieee1394-${ieee1394_id} | sed -e 's@:@-@g'`"
 350             RESULT=0
 351         else
 352             handle_block_scsi "$D"
 353         fi
 354         ;;
 355
 356         *)
 357         : not handled
 358         RESULT=1
 359         return
 360
 361         ;;
 362     esac
 363     # look for a partition
 364     if [ "$full_sysfs_class_path" != "$SYSFS$DEVPATH" ] ; then
 365         dp="`echo $SYSFS$DEVPATH | sed -e 's@^/.*/@@;s@^[^0-9]\{1,\}@@;s@.*_@@'`"
 366         case "$d" in
 367             *[0-9])
 368             d="${d}p${dp}"
 369             ;;
 370             *)
 371                 d="${d}${dp}"
 372                 ;;
 373         esac
 374     fi
 375     # done
 376     echo "ID_PATH=$d"
 377 }
 378
 379 case "$TYPE" in
 380         block)
 381         handle_block
 382         ;;
 383         *)
 384         RESULT=1
 385         ;;
 386 esac
 387 exit $RESULT