[PATCH 08/14] iotests/common.rc: _make_test_img(): smarter compressiont_type handling

[Vladimir Sementsov-Ogievskiy]

Like it is done in iotests.py in qemu_img_create_prepare_args(), let's
not follow compression_type=zstd of IMGOPTS if test creates image in
old format.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
---
 tests/qemu-iotests/common.rc | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index cbbf6d7c7f..4cae5b2d70 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -438,6 +438,14 @@ _make_test_img()
             backing_file=$param
             continue
         elif $opts_param; then
+            if [[ "$param" == *"compat=0"* ]]; then
+                # If user specified zstd compression type in IMGOPTS, this will
+                # just not work. So, let's imply forcing zlib compression when
+                # test creates image in old version of the format.
+                # Similarly works qemu_img_create_prepare_args() in iotests.py
+                optstr=$(echo "$optstr" | $SED -e 's/compression_type=\w\+//')
+                optstr=$(_optstr_add "$optstr" "compression_type=zlib")
+            fi
             optstr=$(_optstr_add "$optstr" "$param")
             opts_param=false
             continue
-- 
2.29.2