[RFC PATCH v2 07/11] qemu_iotests: extend the check script to support valgrind for python tests

[Emanuele Giuseppe Esposito <eesposit@redhat.com>]

Currently, the check script only parses the option and sets the
VALGRIND_QEMU environmental variable to "y".
Add another iotests python variable that prepares the command line,
identical to the one provided in the test scripts.

Because the python script does not know in advance the valgrind
PID to assign to the log file name, use the "%p" flag in valgrind
log file name that automatically puts the process PID at runtime.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
 tests/qemu-iotests/iotests.py | 11 +++++++++++
 tests/qemu-iotests/testenv.py |  1 +
 2 files changed, 12 insertions(+)

diff --git a/tests/qemu-iotests/iotests.py b/tests/qemu-iotests/iotests.py
index 8f6bb20af5..7c28f0cb74 100644
--- a/tests/qemu-iotests/iotests.py
+++ b/tests/qemu-iotests/iotests.py
@@ -96,6 +96,17 @@
     sys.stderr.write('Please run this test via the "check" script\n')
     sys.exit(os.EX_USAGE)
 
+qemu_valgrind = []
+if os.environ.get('VALGRIND_QEMU') == "y" and \
+    os.environ.get('NO_VALGRIND') != "y":
+    valgrind_logfile = "--log-file=" + test_dir.strip()
+    # %p allows to put the valgrind process PID, since
+    # we don't know it a priori (subprocess.Peopen is
+    # not yet invoked)
+    valgrind_logfile += "/%p.valgrind"
+
+    qemu_valgrind = ['valgrind', valgrind_logfile, '--error-exitcode=99']
+
 socket_scm_helper = os.environ.get('SOCKET_SCM_HELPER', 'socket_scm_helper')
 
 luks_default_secret_object = 'secret,id=keysec0,data=' + \
diff --git a/tests/qemu-iotests/testenv.py b/tests/qemu-iotests/testenv.py
index 669eb6b925..86798bf752 100644
--- a/tests/qemu-iotests/testenv.py
+++ b/tests/qemu-iotests/testenv.py
@@ -280,6 +280,7 @@ def print_env(self) -> None:
 SOCK_DIR      -- {SOCK_DIR}
 SOCKET_SCM_HELPER -- {SOCKET_SCM_HELPER}
 GDB_QEMU      -- "{GDB_QEMU}"
+VALGRIND_QEMU     -- "{VALGRIND_QEMU}"
 """
 
         args = collections.defaultdict(str, self.get_env())
-- 
2.30.2