test_cephfs_shell: initialize stderr for run_cephfs_shell_cmd()

Since teuthology initializes stderr to None by default, absence of this
breaks the tests accessing stderr of commands executed within the test
when the execution is using teuthology.

Fixes: https://tracker.ceph.com/issues/42806
Signed-off-by: Rishabh Dave <ridave@redhat.com>

diff --git a/qa/tasks/cephfs/test_cephfs_shell.py b/qa/tasks/cephfs/test_cephfs_shell.py
index 5882c1bb6bd513361b905f06fb96ca7790219f1f..151a1117edefaf9c354116f869165f5aed9d8cac 100644 (file)
--- a/qa/tasks/cephfs/test_cephfs_shell.py
+++ b/qa/tasks/cephfs/test_cephfs_shell.py
@@ -46,7 +46,7 @@ class TestCephFSShell(CephFSTestCase):
 
         log.info("Running command: {}".format(" ".join(args)))
         return mount_x.client_remote.run(args=args, stdout=StringIO(),
-                                           stdin=stdin)
+                                         stderr=StringIO(), stdin=stdin)
 
     def get_cephfs_shell_cmd_output(self, cmd, mount_x=None, opts=None,
                                     stdin=None):