iotests: Add test for image creation fallback

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200122164532.178040-6-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
[mreitz: Added a note that NBD does not support resizing, which is why
         the second case is expected to fail]
Signed-off-by: Max Reitz <mreitz@redhat.com>

tests/qemu-iotests/259

@@ -0,0 +1,62 @@
+#!/usr/bin/env bash
+#
+# Test generic image creation fallback (by using NBD)
+#
+# Copyright (C) 2019 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 $seq"
+
+status=1	# failure is the default!
+
+_cleanup()
+{
+    _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt raw
+_supported_proto nbd
+_supported_os Linux
+
+
+_make_test_img 64M
+
+echo
+echo '--- Testing creation ---'
+
+$QEMU_IMG create -f qcow2 "$TEST_IMG" 64M | _filter_img_create
+$QEMU_IMG info "$TEST_IMG" | _filter_img_info
+
+echo
+echo '--- Testing creation for which the node would need to grow ---'
+
+# NBD does not support resizing, so this will fail
+$QEMU_IMG create -f qcow2 -o preallocation=metadata "$TEST_IMG" 64M 2>&1 \
+    | _filter_img_create
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0

tests/qemu-iotests/259.out

@@ -0,0 +1,14 @@
+QA output created by 259
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+
+--- Testing creation ---
+Formatting 'TEST_DIR/t.IMGFMT', fmt=qcow2 size=67108864
+image: TEST_DIR/t.IMGFMT
+file format: qcow2
+virtual size: 64 MiB (67108864 bytes)
+disk size: unavailable
+
+--- Testing creation for which the node would need to grow ---
+qemu-img: TEST_DIR/t.IMGFMT: Could not resize image: Image format driver does not support resize
+Formatting 'TEST_DIR/t.IMGFMT', fmt=qcow2 size=67108864 preallocation=metadata
+*** done

tests/qemu-iotests/group

@@ -273,6 +273,7 @@
 256 rw auto quick
 257 rw
 258 rw quick
+259 rw auto quick
 260 rw quick
 261 rw
 262 rw quick migration