cmd/zpool_id/zpool_id

   1 #!/bin/sh
   2
   3 CONFIG="${CONFIG:-/etc/zfs/zdev.conf}"
   4
   5 if [ -z "${PATH_ID}" ]; then
   6         # The path_id helper became a builtin command in udev 174.
   7         if [ -x '/lib/udev/path_id' ]; then
   8                 PATH_ID='/lib/udev/path_id'
   9         else
  10                 PATH_ID='udevadm test-builtin path_id'
  11         fi
  12 fi
  13
  14 die() {
  15         echo "Error: $*"
  16         exit 1
  17 }
  18
  19 usage() {
  20         cat << EOF
  21 Usage: zpool_id [-h] [-c configfile] <devpath>
  22   -c    Alternate config file [default /etc/zfs/zdev.conf]
  23   -d    Use path_id from device as the mapping key
  24   -h    Show this message
  25 EOF
  26         exit 1
  27 }
  28
  29 while getopts 'c:d:h' OPTION; do
  30         case ${OPTION} in
  31         c)
  32                 CONFIG="${OPTARG}"
  33                 ;;
  34         d)
  35                 DEVICE="${OPTARG}"
  36                 ;;
  37         h)
  38                 usage
  39                 ;;
  40         esac
  41 done
  42
  43 # Check that a device was requested
  44 [ -z "${DEVICE}" ] && usage
  45
  46 # Check for the existence of a configuration file
  47 [ ! -f "${CONFIG}" ] && die "Missing config file: ${CONFIG}"
  48
  49 # If we are handling a multipath device then $DM_UUID will be
  50 # exported and we'll use its value (prefixed with dm-uuid per
  51 # multipathd's naming convention) as our unique persistent key.
  52 # For traditional devices we'll obtain the key from udev's
  53 # path_id.
  54 if [ -n "${DM_UUID}" ] && echo "${DM_UUID}" | grep -q -e '^mpath' ; then
  55         ID_PATH="dm-uuid-${DM_UUID}"
  56 else
  57         eval `${PATH_ID} ${DEVICE}`
  58         [ -z "${ID_PATH}" ] && die "Missing ID_PATH for ${DEVICE}"
  59 fi
  60
  61 # Use the persistent key to lookup the zpool device id in the
  62 # configuration file which is of the format <device id> <key>.
  63 # Lines starting with #'s are treated as comments and ignored.
  64 # Exact matches are required, wild cards are not supported,
  65 # and only the first match is returned.
  66 ID_ZPOOL=''
  67 while read CONFIG_ZPOOL CONFIG_PATH REPLY; do
  68         if [ "${CONFIG_ZPOOL}" != "${CONFIG_ZPOOL#\#}" ]; then
  69                 # Skip comment lines.
  70                 continue
  71         fi
  72         if [ "${CONFIG_PATH}" = "${ID_PATH}" ]; then
  73                 ID_ZPOOL="${CONFIG_ZPOOL}"
  74                 break
  75         fi
  76 done <"${CONFIG}"
  77
  78 [ -z "${ID_ZPOOL}" ] && die "Missing ID_ZPOOL for ID_PATH: ${ID_PATH}"
  79
  80 if [ -n "${ID_ZPOOL}" ]; then
  81         echo "ID_PATH=${ID_PATH}"
  82         echo "ID_ZPOOL=${ID_ZPOOL}"
  83         echo "ID_ZPOOL_PATH=disk/zpool/${ID_ZPOOL}"
  84 fi
  85
  86 exit 0