PowerMax Driver - Allow for case mismatch in SGs

When checking if a storage group is a child of a parent storage
group the check is currently case sensitive. We should allow for
a pattern match that is not case sensitive. For example,
myStorageGroup should equal MYSTORAGEGROUP or mystoragegroup.

Closes-Bug: #1929429
Change-Id: I8dd114fedece8e9d8f85c1ed237c31aede907d67

cinder/tests/unit/volume/drivers/dell_emc/powermax/test_powermax_rest.py

@@ -628,6 +628,22 @@ class PowerMaxRestTest(test.TestCase):
         self.assertTrue(is_child1)
         self.assertFalse(is_child2)
 
+    def test_is_child_sg_in_parent_sg_case_not_matching(self):
+        lower_case_host = 'OS-hostx-SRP_1-DiamondDSS-os-fibre-PG'
+
+        is_child1 = self.rest.is_child_sg_in_parent_sg(
+            self.data.array, lower_case_host,
+            self.data.parent_sg_f)
+        self.assertTrue(is_child1)
+
+    def test_is_child_sg_in_parent_sg_spelling_mistake(self):
+        lower_case_host = 'OS-hosty-SRP_1-DiamondDSS-os-fiber-PG'
+
+        is_child1 = self.rest.is_child_sg_in_parent_sg(
+            self.data.array, lower_case_host,
+            self.data.parent_sg_f)
+        self.assertFalse(is_child1)
+
     def test_add_child_sg_to_parent_sg(self):
         payload = {'editStorageGroupActionParam': {
             'expandStorageGroupParam': {

cinder/volume/drivers/dell_emc/powermax/rest.py

@@ -925,7 +925,8 @@ class PowerMaxRest(object):
         parent_sg = self.get_storage_group(array, parent_name)
         if parent_sg and parent_sg.get('child_storage_group'):
             child_sg_list = parent_sg['child_storage_group']
-            if child_name in child_sg_list:
+            if child_name.lower() in (
+                    child.lower() for child in child_sg_list):
                 return True
         return False
 

releasenotes/notes/bug1929429-e749f5e5a242a599.yaml

@@ -0,0 +1,8 @@
+---
+fixes:
+  - |
+    PowerMax driver `bug #1929429
+    <https://bugs.launchpad.net/cinder/+bug/1929429>`_: Fixes
+    child/parent storage group check so that a pattern match
+    is not case sensitive. For example, myStorageGroup should
+    equal MYSTORAGEGROUP and mystoragegroup.