tasks/cephfs: add TestConfigCommands

Get some coverage on the otherwise rarely touched
injectargs and `config set` interfaces.

Fixes: #14365
Signed-off-by: John Spray <john.spray@redhat.com>

suites/fs/recovery/tasks/config-commands.yaml

@@ -0,0 +1,11 @@
+
+overrides:
+  ceph:
+    conf:
+      global:
+        lockdep: true
+
+tasks:
+  - cephfs_test_runner:
+      modules:
+        - tasks.cephfs.test_config_commands

tasks/cephfs/test_config_commands.py

@@ -0,0 +1,51 @@
+
+from unittest import case
+from tasks.cephfs.cephfs_test_case import CephFSTestCase
+from tasks.cephfs.fuse_mount import FuseMount
+
+
+class TestConfigCommands(CephFSTestCase):
+    """
+    Test that daemons and clients respond to the otherwise rarely-used
+    runtime config modification operations.
+    """
+
+    CLIENTS_REQUIRED = 1
+    MDSS_REQUIRED = 1
+
+    def test_client_config(self):
+        """
+        That I can successfully issue asok "config set" commands
+
+        :return:
+        """
+
+        if not isinstance(self.mount_a, FuseMount):
+            raise case.SkipTest("Test only applies to FUSE clients")
+
+        test_key = "client_cache_size"
+        test_val = "123"
+        self.mount_a.admin_socket(['config', 'set', test_key, test_val])
+        out = self.mount_a.admin_socket(['config', 'get', test_key])
+        self.assertEqual(out[test_key], test_val)
+
+        self.mount_a.umount_wait()
+
+    def test_mds_config_asok(self):
+        test_key = "mds_max_purge_ops"
+        test_val = "123"
+        self.fs.mds_asok(['config', 'set', test_key, test_val])
+        out = self.fs.mds_asok(['config', 'get', test_key])
+        self.assertEqual(out[test_key], test_val)
+
+    def test_mds_config_tell(self):
+        test_key = "mds_max_purge_ops"
+        test_val = "123"
+
+        mds_id = self.fs.get_lone_mds_id()
+        self.fs.mon_manager.raw_cluster_cmd("tell", "mds.{0}".format(mds_id), "injectargs",
+                                            "--{0}={1}".format(test_key, test_val))
+
+        # Read it back with asok because there is no `tell` equivalent
+        out = self.fs.mds_asok(['config', 'get', test_key])
+        self.assertEqual(out[test_key], test_val)