extras/path_id

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