[v2,3/3] qemu-iotests: test backup compression in 055

diff --git a/tests/qemu-iotests/055 b/tests/qemu-iotests/055
index c8e3578..3ac6894 100755
--- a/tests/qemu-iotests/055
+++ b/tests/qemu-iotests/055
@@ -451,5 +451,102 @@  class TestSingleTransaction(iotests.QMPTestCase):
         self.assert_qmp(result, 'error/class', 'GenericError')
         self.assert_no_active_block_jobs()
 
+
+class TestDriveCompression(iotests.QMPTestCase):
+    image_len = 64 * 1024 * 1024 # MB
+    outfmt = 'qcow2'
+
+    def setUp(self):
+        # Write data to the image so we can compare later
+        qemu_img('create', '-f', iotests.imgfmt, test_img, str(TestDriveCompression.image_len))
+        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x11 0 64k', test_img)
+        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x00 64k 128k', test_img)
+        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x22 162k 32k', test_img)
+        qemu_io('-f', iotests.imgfmt, '-c', 'write -P0x33 67043328 64k', test_img)
+
+        qemu_img('create', '-f', TestDriveCompression.outfmt, blockdev_target_img,
+                 str(TestDriveCompression.image_len))
+        self.vm = iotests.VM().add_drive(test_img).add_drive(blockdev_target_img,
+                                                             format=TestDriveCompression.outfmt)
+        self.vm.launch()
+
+    def tearDown(self):
+        self.vm.shutdown()
+        os.remove(test_img)
+        os.remove(blockdev_target_img)
+        try:
+            os.remove(target_img)
+        except OSError:
+            pass
+
+    def do_test_compress_complete(self, cmd, **args):
+        self.assert_no_active_block_jobs()
+
+        result = self.vm.qmp(cmd, device='drive0', sync='full', compress=True, **args)
+        self.assert_qmp(result, 'return', {})
+
+        self.wait_until_completed()
+
+        self.vm.shutdown()
+        self.assertTrue(iotests.compare_images(test_img, blockdev_target_img,
+                                               iotests.imgfmt, TestDriveCompression.outfmt),
+                        'target image does not match source after backup')
+
+    def test_complete_compress_drive_bakup(self):
+        self.do_test_compress_complete('drive-backup', target=blockdev_target_img, mode='existing')
+
+    def test_complete_compress_blockdev_backup(self):
+        self.do_test_compress_complete('blockdev-backup', target='drive1')
+
+    def do_test_compress_cancel(self, cmd, **args):
+        self.assert_no_active_block_jobs()
+
+        result = self.vm.qmp(cmd, device='drive0', sync='full', compress=True, **args)
+        self.assert_qmp(result, 'return', {})
+
+        event = self.cancel_and_wait()
+        self.assert_qmp(event, 'data/type', 'backup')
+
+    def test_compress_cancel_drive_bakup(self):
+        self.do_test_compress_cancel('drive-backup', target=blockdev_target_img, mode='existing')
+
+    def test_compress_cancel_blockdev_backup(self):
+        self.do_test_compress_cancel('blockdev-backup', target='drive1')
+
+    def do_test_compress_pause(self, cmd, **args):
+        self.assert_no_active_block_jobs()
+
+        self.vm.pause_drive('drive0')
+        result = self.vm.qmp(cmd, device='drive0', sync='full', compress=True, **args)
+        self.assert_qmp(result, 'return', {})
+
+        result = self.vm.qmp('block-job-pause', device='drive0')
+        self.assert_qmp(result, 'return', {})
+
+        self.vm.resume_drive('drive0')
+        time.sleep(1)
+        result = self.vm.qmp('query-block-jobs')
+        offset = self.dictpath(result, 'return[0]/offset')
+
+        time.sleep(1)
+        result = self.vm.qmp('query-block-jobs')
+        self.assert_qmp(result, 'return[0]/offset', offset)
+
+        result = self.vm.qmp('block-job-resume', device='drive0')
+        self.assert_qmp(result, 'return', {})
+
+        self.wait_until_completed()
+
+        self.vm.shutdown()
+        self.assertTrue(iotests.compare_images(test_img, blockdev_target_img,
+                                               iotests.imgfmt, TestDriveCompression.outfmt),
+                        'target image does not match source after backup')
+
+    def test_compress_pause_drive_bakup(self):
+        self.do_test_compress_pause('drive-backup', target=blockdev_target_img, mode='existing')
+
+    def test_compress_pause_blockdev_backup(self):
+        self.do_test_compress_pause('blockdev-backup', target='drive1')
+
 if __name__ == '__main__':
     iotests.main(supported_fmts=['raw', 'qcow2'])
diff --git a/tests/qemu-iotests/055.out b/tests/qemu-iotests/055.out
index 42314e9..5ce2f9a 100644
--- a/tests/qemu-iotests/055.out
+++ b/tests/qemu-iotests/055.out
@@ -1,5 +1,5 @@ 
-........................
+..............................
 ----------------------------------------------------------------------
-Ran 24 tests
+Ran 30 tests
 
 OK
diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 56f988a..382771c 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -89,10 +89,10 @@  def qemu_io(*args):
         sys.stderr.write('qemu-io received signal %i: %s\n' % (-exitcode, ' '.join(args)))
     return subp.communicate()[0]
 
-def compare_images(img1, img2):
+def compare_images(img1, img2, fmt1=imgfmt, fmt2=imgfmt):
     '''Return True if two image files are identical'''
-    return qemu_img('compare', '-f', imgfmt,
-                    '-F', imgfmt, img1, img2) == 0
+    return qemu_img('compare', '-f', fmt1,
+                    '-F', fmt2, img1, img2) == 0
 
 def create_image(name, size):
     '''Create a fully-allocated raw image with sector markers'''
@@ -175,14 +175,14 @@  class VM(object):
         self._args.append(opts)
         return self
 
-    def add_drive(self, path, opts='', interface='virtio'):
+    def add_drive(self, path, opts='', interface='virtio', format=imgfmt):
         '''Add a virtio-blk drive to the VM'''
         options = ['if=%s' % interface,
                    'id=drive%d' % self._num_drives]
 
         if path is not None:
             options.append('file=%s' % path)
-            options.append('format=%s' % imgfmt)
+            options.append('format=%s' % format)
             options.append('cache=%s' % cachemode)
 
         if opts: