#!/bin/bash
#
# Test image locking
#
# Copyright 2016, 2017 Red Hat, Inc.
#
# 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=famz@redhat.com

seq="$(basename $0)"
echo "QA output created by $seq"

here="$PWD"
tmp=/tmp/$$
status=1	# failure is the default!

_cleanup()
{
    _cleanup_test_img
    rm -f "${TEST_IMG}.base"
    rm -f "${TEST_IMG}.overlay"
    rm -f "${TEST_IMG}.convert"
    rm -f "${TEST_IMG}.a"
    rm -f "${TEST_IMG}.b"
    rm -f "${TEST_IMG}.c"
    rm -f "${TEST_IMG}.lnk"
}
trap "_cleanup; exit \$status" 0 1 2 3 15

# get standard environment, filters and checks
. ./common.rc
. ./common.filter
. ./common.qemu

size=32M

_check_ofd()
{
    _make_test_img $size >/dev/null
    if $QEMU_IMG_PROG info --image-opts "driver=file,locking=on,filename=$TEST_IMG" 2>&1 |
        grep -q 'falling back to POSIX file'; then
        return 1
    else
        return 0
    fi
}

_check_ofd || _notrun "OFD lock not available"

_supported_fmt qcow2
_supported_proto file
_supported_os Linux

_run_cmd()
{
    echo
    (echo "$@"; "$@" 2>&1 1>/dev/null) | _filter_testdir
}

function _do_run_qemu()
{
    (
        if ! test -t 0; then
            while read cmd; do
                echo $cmd
            done
        fi
        echo quit
    ) | $QEMU -nographic -monitor stdio -serial none "$@" 1>/dev/null
}

function _run_qemu_with_images()
{
    _do_run_qemu \
        $(for i in $@; do echo "-drive if=none,file=$i"; done) 2>&1 \
        | _filter_testdir | _filter_qemu
}

echo "== readonly=off,force-share=on should be rejected =="
_run_qemu_with_images null-co://,readonly=off,force-share=on

for opts1 in "" "read-only=on" "read-only=on,force-share=on"; do
    echo
    echo "== Creating base image =="
    TEST_IMG="${TEST_IMG}.base" _make_test_img $size

    echo
    echo "== Creating test image =="
    $QEMU_IMG create -f $IMGFMT "${TEST_IMG}" -b ${TEST_IMG}.base | _filter_img_create

    echo
    echo "== Launching QEMU, opts: '$opts1' =="
    _launch_qemu -drive file="${TEST_IMG}",if=none,$opts1
    h=$QEMU_HANDLE

    for opts2 in "" "read-only=on" "read-only=on,force-share=on"; do
        echo
        echo "== Launching another QEMU, opts: '$opts2' =="
        echo "quit" | \
            $QEMU -nographic -monitor stdio \
            -drive file="${TEST_IMG}",if=none,$opts2 2>&1 1>/dev/null | \
            _filter_testdir | _filter_qemu
    done

    for L in "" "-U"; do

        echo
        echo "== Running utility commands $L =="
        _run_cmd $QEMU_IO $L -c "read 0 512" "${TEST_IMG}"
        _run_cmd $QEMU_IO $L -r -c "read 0 512" "${TEST_IMG}"
        _run_cmd $QEMU_IO -c "open $L ${TEST_IMG}" -c "read 0 512"
        _run_cmd $QEMU_IO -c "open -r $L ${TEST_IMG}" -c "read 0 512"
        _run_cmd $QEMU_IMG info        $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG check       $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG compare     $L "${TEST_IMG}" "${TEST_IMG}"
        _run_cmd $QEMU_IMG map         $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG amend -o "" $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG commit      $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG resize      $L "${TEST_IMG}" $size
        _run_cmd $QEMU_IMG rebase      $L "${TEST_IMG}" -b "${TEST_IMG}.base"
        _run_cmd $QEMU_IMG snapshot -l $L "${TEST_IMG}"
        _run_cmd $QEMU_IMG convert     $L "${TEST_IMG}" "${TEST_IMG}.convert"
        _run_cmd $QEMU_IMG dd          $L if="${TEST_IMG}" of="${TEST_IMG}.convert" bs=512 count=1
        _run_cmd $QEMU_IMG bench       $L -c 1 "${TEST_IMG}"
        _run_cmd $QEMU_IMG bench       $L -w -c 1 "${TEST_IMG}"

        # qemu-img create does not support -U
        if [ -z "$L" ]; then
            _run_cmd $QEMU_IMG create -f $IMGFMT "${TEST_IMG}" \
                                      -b ${TEST_IMG}.base
            # Read the file format.  It used to be the case that
            # file-posix simply truncated the file, but the qcow2
            # driver then failed to format it because it was unable
            # to acquire the necessary WRITE permission.  However, the
            # truncation was already wrong, and the whole process
            # resulted in the file being completely empty and thus its
            # format would be detected to be raw.
            # So we read it here to see that creation either completed
            # successfully (thus the format is qcow2) or it aborted
            # before the file was changed at all (thus the format stays
            # qcow2).
            _img_info -U | grep 'file format'
        fi
    done
    _send_qemu_cmd $h "{ 'execute': 'quit', }" ""
    echo
    echo "Round done"
    _cleanup_qemu
done

test_opts="read-only=off read-only=on read-only=on,force-share=on"
for opt1 in $test_opts; do
    for opt2 in $test_opts; do
        echo
        echo "== Two devices with the same image ($opt1 - $opt2) =="
        _run_qemu_with_images "${TEST_IMG},$opt1" "${TEST_IMG},$opt2"
    done
done

echo
echo "== Creating ${TEST_IMG}.[abc] ==" | _filter_testdir
(
    $QEMU_IMG create -f qcow2 "${TEST_IMG}.a" -b "${TEST_IMG}"
    $QEMU_IMG create -f qcow2 "${TEST_IMG}.b" -b "${TEST_IMG}"
    $QEMU_IMG create -f qcow2 "${TEST_IMG}.c" -b "${TEST_IMG}.b"
) | _filter_img_create

echo
echo "== Two devices sharing the same file in backing chain =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}.b"
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}.c"

echo
echo "== Backing image also as an active device =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG}"

echo
echo "== Backing image also as an active device (ro) =="
_run_qemu_with_images "${TEST_IMG}.a" "${TEST_IMG},readonly=on"

echo
echo "== Symbolic link =="
rm -f "${TEST_IMG}.lnk" &>/dev/null
ln -s ${TEST_IMG} "${TEST_IMG}.lnk" || echo "Failed to create link"
_run_qemu_with_images "${TEST_IMG}.lnk" "${TEST_IMG}"

echo
echo "== Active commit to intermediate layer should work when base in use =="
_launch_qemu -drive format=$IMGFMT,file="${TEST_IMG}.a",id=drive0,if=none \
             -device virtio-blk,drive=drive0

_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'qmp_capabilities' }" \
    'return'
_run_cmd $QEMU_IMG commit -b "${TEST_IMG}.b" "${TEST_IMG}.c"

_cleanup_qemu

_launch_qemu

_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'qmp_capabilities' }" \
    'return'

echo "Adding drive"
_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'human-monitor-command',
       'arguments': { 'command-line': 'drive_add 0 if=none,id=d0,file=${TEST_IMG}' } }" \
    ""

_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'

echo "Creating overlay with qemu-img when the guest is running should be allowed"
_run_cmd $QEMU_IMG create -f $IMGFMT -b "${TEST_IMG}" "${TEST_IMG}.overlay"

echo "== Closing an image should unlock it =="
_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'human-monitor-command',
       'arguments': { 'command-line': 'drive_del d0' } }" \
    ""

_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'

echo "Adding two and closing one"
for d in d0 d1; do
    _send_qemu_cmd $QEMU_HANDLE \
        "{ 'execute': 'human-monitor-command',
           'arguments': { 'command-line': 'drive_add 0 if=none,id=$d,file=${TEST_IMG},readonly=on' } }" \
        ""
done

_run_cmd $QEMU_IMG info "${TEST_IMG}"

_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'human-monitor-command',
       'arguments': { 'command-line': 'drive_del d0' } }" \
    ""

_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'

echo "Closing the other"
_send_qemu_cmd $QEMU_HANDLE \
    "{ 'execute': 'human-monitor-command',
       'arguments': { 'command-line': 'drive_del d1' } }" \
    ""

_run_cmd $QEMU_IO "${TEST_IMG}" -c 'write 0 512'

_cleanup_qemu

echo
echo "== Detecting -U and force-share conflicts =="

echo
echo 'No conflict:'
$QEMU_IMG info -U --image-opts driver=null-co,force-share=on
echo
echo 'Conflict:'
$QEMU_IMG info -U --image-opts driver=null-co,force-share=off

echo
echo 'No conflict:'
$QEMU_IO -c 'open -r -U -o driver=null-co,force-share=on'
echo
echo 'Conflict:'
$QEMU_IO -c 'open -r -U -o driver=null-co,force-share=off'

# success, all done
echo "*** done"
rm -f $seq.full
status=0