[PATCH] iotests/279: Fix for non-qcow2 formats

[Max Reitz <mreitz@redhat.com>]

First, driver=qcow2 will not work so well with non-qcow2 formats (and
this test claims to support qcow, qed, and vmdk).

Second, vmdk will always report the backing file format to be vmdk.
Filter that out so the output looks like for all other formats.

Third, the flat vmdk subformats do not support backing files, so they
will not work with this test.

Signed-off-by: Max Reitz <mreitz@redhat.com>
---
 tests/qemu-iotests/279 | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/279 b/tests/qemu-iotests/279
index 6682376808..30d29b1cb2 100755
--- a/tests/qemu-iotests/279
+++ b/tests/qemu-iotests/279
@@ -38,6 +38,8 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 _supported_fmt qcow qcow2 vmdk qed
 _supported_proto file
 _supported_os Linux
+_unsupported_imgopts "subformat=monolithicFlat" \
+                     "subformat=twoGbMaxExtentFlat" \
 
 TEST_IMG="$TEST_IMG.base" _make_test_img 64M
 TEST_IMG="$TEST_IMG.mid" _make_test_img -b "$TEST_IMG.base"
@@ -45,11 +47,12 @@ _make_test_img -b "$TEST_IMG.mid"
 
 echo
 echo '== qemu-img info --backing-chain =='
-_img_info --backing-chain | _filter_img_info
+_img_info --backing-chain | _filter_img_info | grep -v 'backing file format'
 
 echo
 echo '== qemu-img info --backing-chain --image-opts =='
-TEST_IMG="driver=qcow2,file.driver=file,file.filename=$TEST_IMG" _img_info --backing-chain --image-opts | _filter_img_info
+TEST_IMG="driver=$IMGFMT,file.driver=file,file.filename=$TEST_IMG" _img_info --backing-chain --image-opts \
+    | _filter_img_info | grep -v 'backing file format'
 
 # success, all done
 echo "*** done"
-- 
2.23.0