iotests: add test for QCOW2 header dump

The simple script creates a QCOW2 image and fills it with some data.
Two bitmaps are created as well. Then the script reads the image header
with extensions from the disk by running the script qcow2.py and dumps
the information to the output. Other entities, such as snapshots, may
be added to the test later.

Suggested-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <1596742557-320265-2-git-send-email-andrey.shinkevich@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/qemu-iotests/303 b/tests/qemu-iotests/303
new file mode 100755
index 0000000000..e9accdc7bc
--- /dev/null
+++ b/tests/qemu-iotests/303
@@ -0,0 +1,60 @@
+#!/usr/bin/env python3
+#
+# Test for dumping of qcow2 image metadata
+#
+# Copyright (c) 2020 Virtuozzo International GmbH
+#
+# 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/>.
+#
+
+import iotests
+import subprocess
+from iotests import qemu_img_create, qemu_io, file_path, log, filter_qemu_io
+
+iotests.script_initialize(supported_fmts=['qcow2'])
+
+disk = file_path('disk')
+chunk = 1024 * 1024
+
+
+def create_bitmap(bitmap_number, disabled):
+    granularity = 1 << (14 + bitmap_number)
+    bitmap_name = 'bitmap-' + str(bitmap_number)
+    args = ['bitmap', '--add', '-g', f'{granularity}', '-f', iotests.imgfmt,
+            disk, bitmap_name]
+    if disabled:
+        args.append('--disable')
+
+    iotests.qemu_img_pipe(*args)
+
+
+def write_to_disk(offset, size):
+    write = f'write {offset} {size}'
+    log(qemu_io('-c', write, disk), filters=[filter_qemu_io])
+
+
+def add_bitmap(num, begin, end, disabled):
+    log(f'Add bitmap {num}')
+    create_bitmap(num, disabled)
+    for i in range(begin, end):
+        write_to_disk((i) * chunk, chunk)
+    log('')
+
+
+qemu_img_create('-f', iotests.imgfmt, disk, '10M')
+
+add_bitmap(1, 0, 6, False)
+add_bitmap(2, 6, 8, True)
+dump = ['qcow2.py', disk, 'dump-header']
+subprocess.run(dump)