[PATCH] iotests: Skip test_stream_parallel in test 030 when doing "make check"

[Thomas Huth]

The test_stream_parallel test still occasionally fails in the CI.
Thus let's disable it during "make check" for now so that it does
not cause trouble during merge tests. We can enable it again once
the problem has been resolved.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 See e.g. these URLs for the failure:
  https://cirrus-ci.com/task/5449330930745344?command=main#L6482
  https://lists.gnu.org/archive/html/qemu-devel/2020-08/msg00136.html

 tests/check-block.sh   | 3 +++
 tests/qemu-iotests/030 | 4 ++++
 2 files changed, 7 insertions(+)

diff --git a/tests/check-block.sh b/tests/check-block.sh
index 8e29c868e5..a5a69060e1 100755
--- a/tests/check-block.sh
+++ b/tests/check-block.sh
@@ -55,6 +55,9 @@ fi
 
 cd tests/qemu-iotests
 
+# QEMU_CHECK_BLOCK_AUTO is used to disable some unstable sub-tests
+export QEMU_CHECK_BLOCK_AUTO=1
+
 ret=0
 for fmt in $format_list ; do
     ./check -makecheck -$fmt $group || ret=1
diff --git a/tests/qemu-iotests/030 b/tests/qemu-iotests/030
index 31c028306b..8c3af2f658 100755
--- a/tests/qemu-iotests/030
+++ b/tests/qemu-iotests/030
@@ -231,6 +231,10 @@ class TestParallelOps(iotests.QMPTestCase):
     def test_stream_parallel(self):
         self.assert_no_active_block_jobs()
 
+        # The test occasionally failed in the CI, so disable it for "make 
check":
+        if os.environ.get('QEMU_CHECK_BLOCK_AUTO'):
+            return
+
         # Check that the maps don't match before the streaming operations
         for i in range(2, self.num_imgs, 2):
             self.assertNotEqual(qemu_io('-f', iotests.imgfmt, '-rU', '-c', 
'map', self.imgs[i]),
-- 
2.18.2