text: #!/usr/bin/env bash
  #
  # test of qemu-img convert -n - convert without creation
  #
  # Copyright (C) 2009 Red Hat, Inc.
  # Copyright (C) 2013 Alex Bligh (alex@alex.org.uk)
  #
  # This program is free software; you can redistribute it and/or modify
  # it under the terms of the GNU General Public License as published by
  # the Free Software Foundation; either version 2 of the License, or
  # (at your option) any later version.
  #
  # This program 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 General Public License for more details.
  #
  # You should have received a copy of the GNU General Public License
  # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  #
  
  # creator
  owner=alex@alex.org.uk
  
  seq=`basename $0`
  echo "QA output created by $seq"
  
  status=1	# failure is the default!
  
  _cleanup()
  {
      _cleanup_test_img
      for img in "$TEST_IMG".{orig,raw1,raw2,target}; do
          _rm_test_img "$img"
      done
  }
  trap "_cleanup; exit \$status" 0 1 2 3 15
  
  # get standard environment, filters and checks
  . ./common.rc
  . ./common.filter
  . ./common.pattern
  
  _supported_fmt qcow qcow2 vmdk qed raw
  _supported_proto file
  _unsupported_imgopts "subformat=monolithicFlat" \
                       "subformat=twoGbMaxExtentFlat" \
                       "subformat=twoGbMaxExtentSparse" \
                       "subformat=streamOptimized"
  
  _make_test_img 4M
  
  echo "== Testing conversion with -n fails with no target file =="
  if $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.orig" >/dev/null 2>&1; then
      exit 1
  fi
  
  echo "== Testing conversion with -n succeeds with a target file =="
  _rm_test_img "$TEST_IMG.orig"
  TEST_IMG="$TEST_IMG.orig" _make_test_img 4M
  if ! $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.orig" ; then
      exit 1
  fi
  
  echo "== Testing conversion to raw is the same after conversion with -n =="
  # compare the raw files
  if ! $QEMU_IMG convert -f $IMGFMT -O raw "$TEST_IMG" "$TEST_IMG.raw1" ; then
      exit 1
  fi
  
  if ! $QEMU_IMG convert -f $IMGFMT -O raw "$TEST_IMG.orig" "$TEST_IMG.raw2" ; then
      exit 1
  fi
  
  if ! cmp "$TEST_IMG.raw1" "$TEST_IMG.raw2" ; then
      exit 1
  fi
  
  echo "== Testing conversion back to original format =="
  if ! $QEMU_IMG convert -f raw -O $IMGFMT -n "$TEST_IMG.raw2" "$TEST_IMG" ; then
      exit 1
  fi
  _check_test_img
  
  echo "== Testing conversion to a smaller file fails =="
  TEST_IMG="$TEST_IMG.target" _make_test_img 2M
  if $QEMU_IMG convert -f $IMGFMT -O $IMGFMT -n "$TEST_IMG" "$TEST_IMG.target" >/dev/null 2>&1; then
      exit 1
  fi
  
  echo "== Regression testing for copy offloading bug =="
  
  _make_test_img 1M
  TEST_IMG="$TEST_IMG.target" _make_test_img 1M
  $QEMU_IO -c 'write -P 1 0 512k' -c 'write -P 2 512k 512k' "$TEST_IMG" | _filter_qemu_io
  $QEMU_IO -c 'write -P 4 512k 512k' -c 'write -P 3 0 512k' "$TEST_IMG.target" | _filter_qemu_io
  $QEMU_IMG convert -n -O $IMGFMT "$TEST_IMG" "$TEST_IMG.target"
  $QEMU_IMG compare "$TEST_IMG" "$TEST_IMG.target"
  
  echo "*** done"
  rm -f $seq.full
  status=0
  exit 0
  