#!/usr/bin/env bash
# nbdkit
# Copyright Red Hat
#
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#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
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# SUCH DAMAGE.

# Regression test for an earlier bug seen in checkwrite filter.
# https://listman.redhat.com/archives/libguestfs/2022-July/029496.html

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

requires_run
requires_filter checkwrite
requires nbdsh --version
requires_nbdsh_uri
requires dd iflag=count_bytes </dev/null

define plugin <<'EOF'
case "$1" in
  get_size) echo 1048576 ;;
  pread) dd if=/dev/zero count=$3 iflag=count_bytes ;;
  can_extents) exit 0 ;;
  extents)
    echo 0 262144 3
    echo 262144 131072 0
    echo 393216 655360 3
  ;;
  *) exit 2 ;;
esac
EOF

nbdkit sh - <<<"$plugin" --filter=checkwrite \
       --run 'nbdsh -u "$uri" -c "h.zero (655360, 262144, 0)"'
