[Qemu-devel] [PATCH v13 14/14] qemu-iotests: Image fleecing test case 081

[Fam Zheng <famz@redhat.com>]

This tests the workflow of creating a lightweight point-in-time snapshot
with blockdev-backup command and export it with built-in NBD server.

It's tested that after the snapshot it created, writing to the original
device doesn't change data that can be read from target with NBD.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 tests/qemu-iotests/081     | 99 ++++++++++++++++++++++++++++++++++++++++++++++
 tests/qemu-iotests/081.out |  5 +++
 tests/qemu-iotests/group   |  1 +
 3 files changed, 105 insertions(+)
 create mode 100755 tests/qemu-iotests/081
 create mode 100644 tests/qemu-iotests/081.out

diff --git a/tests/qemu-iotests/081 b/tests/qemu-iotests/081
new file mode 100755
index 0000000..8be32d7
--- /dev/null
+++ b/tests/qemu-iotests/081
@@ -0,0 +1,99 @@
+#!/usr/bin/env python
+#
+# Tests for image fleecing (point in time snapshot export to NBD)
+#
+# Copyright (C) 2014 Red Hat, Inc.
+#
+# Based on 055.
+#
+# 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 time
+import os
+import iotests
+from iotests import qemu_img, qemu_io
+
+test_img = os.path.join(iotests.test_dir, 'test.img')
+target_img = os.path.join(iotests.test_dir, 'target.img')
+nbd_sock = os.path.join(iotests.test_dir, 'nbd.sock')
+
+class TestImageFleecing(iotests.QMPTestCase):
+    image_len = 64 * 1024 * 1024 # MB
+
+    def setUp(self):
+        # Write data to the image so we can compare later
+        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestImageFleecing.image_len))
+        self.patterns = [
+                ("0x5d", "0", "64k"),
+                ("0xd5", "1M", "64k"),
+                ("0xdc", "32M", "64k"),
+                ("0xdc", "67043328", "64k")]
+
+        for p in self.patterns:
+            qemu_io('-c', 'write -P%s %s %s' % p, test_img)
+
+        qemu_img('create', '-f', iotests.imgfmt, target_img, str(TestImageFleecing.image_len))
+
+        self.vm = iotests.VM().add_drive(test_img)
+        self.vm.launch()
+
+        self.overwrite_patterns = [
+                ("0xa0", "0", "64k"),
+                ("0x0a", "1M", "64k"),
+                ("0x55", "32M", "64k"),
+                ("0x56", "67043328", "64k")]
+
+        self.nbd_uri = "nbd+unix:///drive1?socket=%s" % nbd_sock
+
+    def tearDown(self):
+        self.vm.shutdown()
+        os.remove(test_img)
+        os.remove(target_img)
+
+    def verify_patterns(self):
+        for p in self.patterns:
+            self.assertEqual(-1, qemu_io(self.nbd_uri, '-c', 'read -P%s %s %s' % p).find("verification failed"),
+                             "Failed to verify pattern: %s %s %s" % p)
+
+    def test_image_fleecing(self):
+        result = self.vm.qmp("blockdev-add", **{"options": {
+            "driver": "qcow2",
+            "id": "drive1",
+            "file": {
+                "driver": "file",
+                "filename": target_img,
+                },
+            "backing": "drive0",
+            }})
+        self.assert_qmp(result, 'return', {})
+        result = self.vm.qmp("nbd-server-start", **{"addr": { "type": "unix", "data": { "path": nbd_sock } } })
+        self.assert_qmp(result, 'return', {})
+        result = self.vm.qmp("blockdev-backup", device="drive0", target="drive1", sync="none")
+        self.assert_qmp(result, 'return', {})
+        result = self.vm.qmp("nbd-server-add", device="drive1")
+        self.assert_qmp(result, 'return', {})
+
+        self.verify_patterns()
+
+        for p in self.overwrite_patterns:
+            self.vm.hmp_qemu_io("drive0", "write -P%s %s %s" % p)
+
+        self.verify_patterns()
+
+        self.cancel_and_wait(resume=True)
+        self.assert_no_active_block_jobs()
+
+if __name__ == '__main__':
+    iotests.main(supported_fmts=['raw', 'qcow2'])
diff --git a/tests/qemu-iotests/081.out b/tests/qemu-iotests/081.out
new file mode 100644
index 0000000..ae1213e
--- /dev/null
+++ b/tests/qemu-iotests/081.out
@@ -0,0 +1,5 @@
+.
+----------------------------------------------------------------------
+Ran 1 tests
+
+OK
diff --git a/tests/qemu-iotests/group b/tests/qemu-iotests/group
index 03c762f..b27072d 100644
--- a/tests/qemu-iotests/group
+++ b/tests/qemu-iotests/group
@@ -82,3 +82,4 @@
 073 rw auto
 074 rw auto
 077 rw auto
+081 rw auto
-- 
1.8.5.3