cmd/zpool/zpool.d/dm-deps

   1 #!/bin/sh
   2 #
   3 # Show device mapper dependent / underlying devices.  This is useful for
   4 # looking up the /dev/sd* devices associated with a dm or multipath device.
   5 #
   6
   7 if [ "$1" = "-h" ] ; then
   8         echo "Show device mapper dependent (underlying) devices."
   9         exit
  10 fi
  11
  12 # shellcheck disable=SC2154
  13 dev="$VDEV_PATH"
  14
  15 # If the VDEV path is a symlink, resolve it to a real device
  16 if [ -L "$dev" ] ; then
  17         dev=$(readlink "$dev")
  18 fi
  19
  20 dev="${dev##*/}"
  21 val=""
  22 if [ -d "/sys/class/block/$dev/slaves" ] ; then
  23         # ls -C: output in columns, no newlines, two spaces (change to one)
  24         # shellcheck disable=SC2012
  25         val=$(ls -C "/sys/class/block/$dev/slaves" | tr -s '[:space:]' ' ')
  26 fi
  27
  28 echo "dm-deps=$val"