pool: get the exact deviceClass name instead of crushroot+deviceClass

this lead to creation of 2 crush rules because of difference in
deviceClass names:
eg:
creating a new crush rule for changed deviceClass
("default~hdd"-->"hdd") on crush rule "test-crush-bug-az-ab-4"

Signed-off-by: Deepika Upadhyay <deepikaupadhyay01@gmail.com>
(cherry picked from commit 41116be919)

pkg/daemon/ceph/client/pool.go

@@ -529,7 +529,15 @@ func extractPoolDetails(rule ruleSpec) (string, string) {
 			failureDomain = step.Type
 		}
 		if step.ItemName != "" {
-			deviceClass = step.ItemName
+			// we are not using crushRoot currently, remove it
+			// from crush rule
+			if strings.Contains(step.ItemName, "~") {
+				crushRootAndDeviceClass := step.ItemName
+				parts := strings.SplitN(crushRootAndDeviceClass, "~", 2)
+				deviceClass = parts[1]
+			} else {
+				deviceClass = step.ItemName
+			}
 		}
 		// We expect the rule to be found by the second step, or else it is a more
 		// complex rule that would not be supported for updating the failure domain

pkg/daemon/ceph/client/pool_test.go

@@ -339,6 +339,16 @@ func TestExtractPoolDetails(t *testing.T) {
 		assert.Equal(t, "zone", failureDomain)
 		assert.Equal(t, "ssd", deviceClass)
 	})
+
+	t.Run("valid crush rule with crushroot combined", func(t *testing.T) {
+		rule := ruleSpec{Steps: []stepSpec{
+			{Type: ""},
+			{Type: "zone", ItemName: "default~ssd"},
+		}}
+		failureDomain, deviceClass := extractPoolDetails(rule)
+		assert.Equal(t, "zone", failureDomain)
+		assert.Equal(t, "ssd", deviceClass)
+	})
 }
 
 func TestGetPoolStatistics(t *testing.T) {