iotests/163: Fix broken qemu-io invocation

The 'read' commands to qemu-io were malformed, and this invocation only
worked by coincidence because the error messages were identical. Oops.

There's no point in checking the patterning of the reference image, so
just check the empty image by itself instead.

(Note: as of this commit, nothing actually enforces that this command
completes successfully, but a forthcoming commit in this series will
enforce that qemu_io() must have a zero status code.)

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220418211504.943969-3-jsnow@redhat.com>
Signed-off-by: Hanna Reitz <hreitz@redhat.com>

diff --git a/tests/qemu-iotests/163 b/tests/qemu-iotests/163
index e4cd4b230f37bb15caff56e19de558fa2dd7881c..c94ad16f4a7be0945668cc839b00bab6a5452b11 100755 (executable)
--- a/tests/qemu-iotests/163
+++ b/tests/qemu-iotests/163
@@ -113,10 +113,7 @@ class ShrinkBaseClass(iotests.QMPTestCase):
         qemu_img('resize',  '-f', iotests.imgfmt, '--shrink', test_img,
                  self.shrink_size)
 
-        self.assertEqual(
-            qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, test_img),
-            qemu_io('-c', 'read -P 0x00 %s'%self.shrink_size, check_img),
-            "Verifying image content")
+        qemu_io('-c', f"read -P 0x00 0 {self.shrink_size}", test_img)
 
         self.image_verify()