From: Daniel P. Berrangé <berrange@redhat.com>

Of most importance is that this gives us a heads-up if anything
we rely on has been deprecated. The default python behaviour
only emits a warning if triggered from __main__ which is very
limited.

Setting the env variable further ensures that any python child
processes will also display warnings.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
(cherry picked from commit 9a494d83538680651197651031375c2b6fa2490b)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

diff --git a/tests/qemu-iotests/check b/tests/qemu-iotests/check
index 545f9ec7bd..d9b7c1d598 100755
--- a/tests/qemu-iotests/check
+++ b/tests/qemu-iotests/check
@@ -21,6 +21,7 @@ import sys
 import argparse
 import shutil
 from pathlib import Path
+import warnings
 
 from findtests import TestFinder
 from testenv import TestEnv
@@ -137,6 +138,9 @@ def make_argparser() -> argparse.ArgumentParser:
 
 
 if __name__ == '__main__':
+    warnings.simplefilter("default")
+    os.environ["PYTHONWARNINGS"] = "default"
+
     args = make_argparser().parse_args()
 
     env = TestEnv(source_dir=args.source_dir,
-- 
2.47.3