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#!/bin/sh
#
# Show device mapper dependent / underlying devices. This is useful for
# looking up the /dev/sd* devices associated with a dm or multipath device.
#
if [ "$1" = "-h" ] ; then
echo "Show device mapper dependent (underlying) devices."
exit
fi
# shellcheck disable=SC2154
dev="$VDEV_PATH"
# If the VDEV path is a symlink, resolve it to a real device
if [ -L "$dev" ] ; then
dev=$(readlink "$dev")
fi
dev="${dev##*/}"
val=""
if [ -d "/sys/class/block/$dev/slaves" ] ; then
# ls -C: output in columns, no newlines, two spaces (change to one)
# shellcheck disable=SC2012
val=$(ls -C "/sys/class/block/$dev/slaves" | tr -s '[:space:]' ' ')
fi
echo "dm-deps=$val"
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