#!/usr/bin/env bash
# nbd client library in userspace
# Copyright Red Hat
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

# Test --blkhash option.

. ../tests/functions.sh

set -e
set -x

requires $DD --version
requires $DD oflag=seek_bytes </dev/null
requires test -r /dev/urandom
requires test -r /dev/zero

randfile=copy-blkhash-randfile.img
cleanup_fn rm -f $randfile
rm -f $randfile

# Create a random sparse file.  Using a very small block size try to
# compute the blkhash.  This tests corner cases in blkhash.c.
touch $randfile
for i in `seq 1 100`; do
    $DD if=/dev/urandom of=$randfile ibs=512 count=1 \
        oflag=seek_bytes seek=$((RANDOM * 9973)) conv=notrunc
    $DD if=/dev/zero of=$randfile ibs=512 count=1 \
        oflag=seek_bytes seek=$((RANDOM * 9973)) conv=notrunc
done

$VG nbdcopy --blkhash=md5/512 $randfile null:
