iotests: Add test for a nonexistent NBD export

Trying to connect to a nonexistent NBD export should not crash the
server.
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NEric Blake <eblake@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/143

+#!/bin/bash
+#
+# Test case for connecting to a non-existing NBD export name
+#
+# Copyright (C) 2016 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=mreitz@redhat.com
+
+seq="$(basename $0)"
+echo "QA output created by $seq"
+
+here="$PWD"
+tmp=/tmp/$$
+status=1	# failure is the default!
+
+_cleanup()
+{
+    rm -f "$TEST_DIR/nbd"
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+. ./common.qemu
+
+_supported_fmt generic
+_supported_proto generic
+_supported_os Linux
+
+keep_stderr=y \
+_launch_qemu 2> >(_filter_nbd)
+
+_send_qemu_cmd $QEMU_HANDLE \
+    "{ 'execute': 'qmp_capabilities' }" \
+    'return'
+
+_send_qemu_cmd $QEMU_HANDLE \
+    "{ 'execute': 'nbd-server-start',
+       'arguments': { 'addr': { 'type': 'unix',
+                                'data': { 'path': '$TEST_DIR/nbd' }}}}" \
+    'return'
+
+# This should just result in a client error, not in the server crashing
+$QEMU_IO_PROG -f raw -c quit \
+    "nbd+unix:///no_such_export?socket=$TEST_DIR/nbd" 2>&1 \
+    | _filter_qemu_io | _filter_nbd
+
+_send_qemu_cmd $QEMU_HANDLE \
+    "{ 'execute': 'quit' }" \
+    'return'
+
+wait=1 _cleanup_qemu
+
+# success, all done
+echo '*** done'
+rm -f $seq.full
+status=0

tests/qemu-iotests/143.out

+QA output created by 143
+{"return": {}}
+{"return": {}}
+can't open device nbd+unix:///no_such_export?socket=TEST_DIR/nbd: Failed to read export length
+{"return": {}}
+{"timestamp": {"seconds":  TIMESTAMP, "microseconds":  TIMESTAMP}, "event": "SHUTDOWN"}
+*** done

tests/qemu-iotests/group

@@ -142,3 +142,4 @@
 138 rw auto quick
 139 rw auto quick
 142 auto
+143 auto quick