[PATCH v2 06/12] tests/qemu-iotests: add QEMU_IOTESTS_REGEN=1 to update reference file

["Daniel P. Berrangé" <berrange@redhat.com>]

When developing an I/O test it is typical to add some logic to the
test script, run it to view the output diff, and then apply the
output diff to the reference file. This can be drastically simplified
by letting the test runner update the reference file in place.

By setting 'QEMU_IOTESTS_REGEN=1', the test runner will report the
failure and show the diff, but at the same time update the reference
file. So next time the I/O test is run it will succeed.

Continuing to display the diff when updating the reference gives the
developer a chance to review what was changed.

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 tests/qemu-iotests/testrunner.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tests/qemu-iotests/testrunner.py b/tests/qemu-iotests/testrunner.py
index 9a94273975..8a82696a6b 100644
--- a/tests/qemu-iotests/testrunner.py
+++ b/tests/qemu-iotests/testrunner.py
@@ -25,6 +25,7 @@
 import contextlib
 import json
 import termios
+import shutil
 import sys
 from multiprocessing import Pool
 from contextlib import contextmanager
@@ -320,6 +321,11 @@ def do_run_test(self, test: str, mp: bool) -> TestResult:
 
         diff = file_diff(str(f_reference), str(f_bad))
         if diff:
+            if os.environ.get("QEMU_IOTESTS_REGEN", None) is not None:
+                shutil.copyfile(str(f_bad), str(f_reference))
+                print("########################################")
+                print("#####    REFERENCE FILE UPDATED    #####")
+                print("########################################")
             return TestResult(status='fail', elapsed=elapsed,
                               description=f'output mismatch (see {f_bad})',
                               diff=diff, casenotrun=casenotrun)
-- 
2.34.1