1 files changed, 9 insertions, 9 deletions
diff --git a/tests/qemu-iotests/114 b/tests/qemu-iotests/114
index 43cb0bc6c3..de6fd327ee 100755
--- a/tests/qemu-iotests/114
+++ b/tests/qemu-iotests/114
@@ -44,16 +44,16 @@ _supported_os Linux
 # qcow2.py does not work too well with external data files
 _unsupported_imgopts data_file
 
-# Intentionally specify backing file without backing format; demonstrate
-# the difference in warning messages when backing file could be probed.
-# Note that only a non-raw probe result will affect the resulting image.
+# Older qemu-img could set up backing file without backing format; modern
+# qemu can't but we can use qcow2.py to simulate older files.
 truncate -s $((64 * 1024 * 1024)) "$TEST_IMG.orig"
-_make_test_img -b "$TEST_IMG.orig" 64M
+_make_test_img -b "$TEST_IMG.orig" -F raw 64M
+$PYTHON qcow2.py "$TEST_IMG" del-header-ext 0xE2792ACA
 
 TEST_IMG="$TEST_IMG.base" _make_test_img 64M
 $QEMU_IMG convert -O qcow2 -B "$TEST_IMG.orig" "$TEST_IMG.orig" "$TEST_IMG"
-_make_test_img -b "$TEST_IMG.base" 64M
-_make_test_img -u -b "$TEST_IMG.base" 64M
+_make_test_img -b "$TEST_IMG.base" -F $IMGFMT 64M
+_make_test_img -u -b "$TEST_IMG.base" -F $IMGFMT 64M
 
 # Set an invalid backing file format
 $PYTHON qcow2.py "$TEST_IMG" add-header-ext 0xE2792ACA "foo"
@@ -64,9 +64,9 @@ _img_info
 $QEMU_IO -c "open $TEST_IMG" -c "read 0 4k" 2>&1 | _filter_qemu_io | _filter_testdir
 $QEMU_IO -c "open -o backing.driver=$IMGFMT $TEST_IMG" -c "read 0 4k" | _filter_qemu_io
 
-# Rebase the image, to show that omitting backing format triggers a warning,
-# but probing now lets us use the backing file.
-$QEMU_IMG rebase -u -b "$TEST_IMG.base" "$TEST_IMG"
+# Rebase the image, to show that backing format is required.
+($QEMU_IMG rebase -u -b "$TEST_IMG.base" "$TEST_IMG" 2>&1 && echo "unexpected pass") | _filter_testdir
+$QEMU_IMG rebase -u -b "$TEST_IMG.base" -F $IMGFMT "$TEST_IMG"
 $QEMU_IO -c "open $TEST_IMG" -c "read 0 4k" 2>&1 | _filter_qemu_io | _filter_testdir
 
 # success, all done