[PATCH v4 5/6] iotests: Skip Python-based tests if QEMU does not support virtio-blk

[Thomas Huth <thuth@redhat.com>]

We are going to enable some of the python-based tests in the "auto" group,
and these tests require virtio-blk to work properly. Running iotests
without virtio-blk likely does not make too much sense anyway, so instead
of adding a check for the availability of virtio-blk to each and every
test (which does not sound very appealing), let's rather add a check for
this a central spot in the "check" script instead (so that it is still
possible to run "make check" for qemu-system-tricore for example).

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 tests/qemu-iotests/check | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index 90970b0549..bce3035d5a 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -642,7 +642,11 @@ fi
 python_usable=false
 if $PYTHON -c 'import sys; sys.exit(0 if sys.version_info >= (3,6) else 1)'
 then
-    python_usable=true
+    # Our python framework also requires virtio-blk
+    if "$QEMU_PROG" -M none -device help | grep -q virtio-blk >/dev/null 2>&1
+    then
+        python_usable=true
+    fi
 fi
 
 default_machine=$($QEMU_PROG -machine help | sed -n '/(default)/ s/ .*//p')
@@ -830,7 +834,7 @@ do
                 run_command="$PYTHON $seq"
             else
                 run_command="false"
-                echo "Unsupported Python version" > $seq.notrun
+                echo "Unsupported Python version or missing virtio-blk" > $seq.notrun
             fi
         else
             run_command="./$seq"
-- 
2.18.1