#!/usr/bin/env bash
# nbdkit
# Copyright Red Hat
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# * Neither the name of Red Hat nor the names of its contributors may be
# used to endorse or promote products derived from this software without
# specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

source ./functions.sh
set -e
set -x

requires_plugin linuxdisk
requires guestfish --version
requires_nbdcopy
requires $STAT --version

sock=$(mktemp -u /tmp/nbdkit-test-sock.XXXXXX)
files="cow-block-size-base.img $sock cow-block-size.pid"
rm -f $files
cleanup_fn rm -f $files

# Create a base image which is partitioned with an empty filesystem.
rm -rf cow-block-size.d
mkdir cow-block-size.d
cleanup_fn rm -rf cow-block-size.d
nbdkit -fv -U - linuxdisk cow-block-size.d size=100M \
       --run 'nbdcopy "$uri" cow-block-size-base.img'
lastmod="$($STAT -c "%y" cow-block-size-base.img)"

# Run nbdkit with a COW overlay, 4M block size and copy on read.
start_nbdkit -P cow-block-size.pid -U $sock \
             --filter=cow file cow-block-size-base.img \
             cow-block-size=4M cow-on-read=true

# Write some data into the overlay.
guestfish --format=raw -a "nbd://?socket=$sock" -m /dev/sda1 <<EOF
  fill-pattern "abcde" 128K /large
  write /hello "hello, world"
EOF

# The original file must not be modified.
currmod="$($STAT -c "%y" cow-block-size-base.img)"

if [ "$lastmod" != "$currmod" ]; then
    echo "$0: FAILED last modified time of base file changed"
    exit 1
fi
