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Filename : un_blkid
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#!/bin/sh
# this script depends on /sbin/blkid from the util-linux package

# usage: un_blkid <device> <fs_type> [<offset>]
# <device> may be any device that should be checked.
# if no <fs_type> is given, the check fails for any valid filesystem
# if <fs_type> is given, the check fails when a filesystem type <fs_type>
# is found on the device.

if test ! -x "/sbin/blkid"; then
  echo " - WARNING: blkid from util-linux is not available, impossible to run checks."
  exit 1
fi

dev="$1"
fs="$2"
offset="${3-}"

blkid="$(/sbin/blkid -o value -s TYPE -p ${offset:+-O "$offset"} -- "$dev")"

# blkid output is empty if $dev has an unknown filesystem
if [ -n "$blkid" ] && [ -z "$fs" ]; then
  echo " - The device $dev contains a filesystem type $blkid${offset:+" at offset $offset"}."
  exit 1
elif [ -n "$fs" ] && [ "$blkid" = "$fs" ]; then
  echo " - The device $dev contains a filesystem type $fs${offset:+" at offset $offset"}."
  exit 1
fi