[Qemu-block] [RFC] iotests: Fix iotests 110 and 126

[Max Reitz]

A recent patch results in qemu-img reporting the backing file format of
vmdk images as vmdk.  This broke iotests 110 and 126.

Fixes: "vmdk: Set vmdk parent backing_format to vmdk"
Signed-off-by: Max Reitz <address@hidden>
---
RFC because:
(1) I'd prefer for this patch to be squashed into the patch mentioned
    above so we avoid broken iotests.
(2) Otherwise, I'd like for the "Fixes" line to contain a commit ID,
    which isn't stable yet, though.

I'd like to mention that these aren't the only broken iotests on
block-next; 059 (with vmdk) is broken, too.  I won't send a patch for
that, though, because to me the whole patch doesn't seem quite right
when compiling qemu with -m32.
---
 tests/qemu-iotests/110 | 10 +++++++---
 tests/qemu-iotests/126 | 10 +++++++---
 2 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/tests/qemu-iotests/110 b/tests/qemu-iotests/110
index fad672c1ae..33b169ffd4 100755
--- a/tests/qemu-iotests/110
+++ b/tests/qemu-iotests/110
@@ -53,8 +53,12 @@ TEST_IMG="$TEST_IMG.base" _make_test_img 64M
 _make_test_img -b "$TEST_IMG_REL.base" 64M
 # qemu should be able to reconstruct the filename, so relative backing names
 # should work
+# (We have to filter the backing file format because vmdk always
+# reports it (as vmdk), whereas other image formats would do so only
+# with the backing_fmt creation option, which neither vmdk nor qcow
+# support)
 
TEST_IMG="json:{'driver':'$IMGFMT','file':{'driver':'file','filename':'$TEST_IMG'}}"
 \
-    _img_info | _filter_img_info
+    _img_info | _filter_img_info | grep -v 'backing file format'
 
 echo
 echo '=== Non-reconstructable filename ==='
@@ -78,7 +82,7 @@ TEST_IMG="json:{
             }
         ]
     }
-}" _img_info | _filter_img_info
+}" _img_info | _filter_img_info | grep -v 'backing file format'
 
 echo
 echo '=== Backing name is always relative to the backed image ==='
@@ -110,7 +114,7 @@ TEST_IMG="json:{
             }
         ]
     }
-}" _img_info | _filter_img_info
+}" _img_info | _filter_img_info | grep -v 'backing file format'
 
 
 # success, all done
diff --git a/tests/qemu-iotests/126 b/tests/qemu-iotests/126
index 96dc048d59..e3ee65c606 100755
--- a/tests/qemu-iotests/126
+++ b/tests/qemu-iotests/126
@@ -62,8 +62,12 @@ TOP_IMG="$TEST_DIR/image:top.$IMGFMT"
 TEST_IMG=$BASE_IMG _make_test_img 64M
 TEST_IMG=$TOP_IMG _make_test_img -b ./image:base.$IMGFMT
 
-# The default cluster size depends on the image format
-TEST_IMG=$TOP_IMG _img_info | grep -v 'cluster_size'
+# (1) The default cluster size depends on the image format
+# (2) vmdk only supports vmdk backing files, so it always reports the
+#     format of its backing file as such (but neither it nor qcow
+#     support the backing_fmt creation option, so we cannot use that to
+#     harmonize the output across all image formats this test supports)
+TEST_IMG=$TOP_IMG _img_info | grep -ve 'cluster_size' -e 'backing file format'
 
 _rm_test_img "$BASE_IMG"
 _rm_test_img "$TOP_IMG"
@@ -79,7 +83,7 @@ TOP_IMG="file:image:top.$IMGFMT"
 TEST_IMG=$BASE_IMG _make_test_img 64M
 TEST_IMG=$TOP_IMG _make_test_img -b "$BASE_IMG"
 
-TEST_IMG=$TOP_IMG _img_info | grep -v 'cluster_size'
+TEST_IMG=$TOP_IMG _img_info | grep -ve 'cluster_size' -e 'backing file format'
 
 _rm_test_img "$BASE_IMG"
 _rm_test_img "image:top.$IMGFMT"
-- 
2.20.1