Sort cloud regions in a stable way

* All comes first
* Then US regions
* Then all other regions alphabetically

awx/main/models/inventory.py

@@ -38,7 +38,7 @@ from awx.main.models.notifications import (
     NotificationTemplate,
     JobNotificationMixin,
 )
-from awx.main.utils import _inventory_updates, get_ansible_version
+from awx.main.utils import _inventory_updates, get_ansible_version, region_sorting
 
 
 __all__ = ['Inventory', 'Host', 'Group', 'InventorySource', 'InventoryUpdate',
@@ -1136,7 +1136,7 @@ class InventorySourceOptions(BaseModel):
                     label_parts.append(part)
                 label = ' '.join(label_parts)
             regions.append((region.name, label))
-        return regions
+        return sorted(regions, key=region_sorting)
 
     @classmethod
     def get_ec2_group_by_choices(cls):
@@ -1165,7 +1165,7 @@ class InventorySourceOptions(BaseModel):
         # authenticating first.  Therefore, use a list from settings.
         regions = list(getattr(settings, 'GCE_REGION_CHOICES', []))
         regions.insert(0, ('all', 'All'))
-        return regions
+        return sorted(regions, key=region_sorting)
 
     @classmethod
     def get_azure_rm_region_choices(self):
@@ -1178,7 +1178,7 @@ class InventorySourceOptions(BaseModel):
         # settings.
         regions = list(getattr(settings, 'AZURE_RM_REGION_CHOICES', []))
         regions.insert(0, ('all', 'All'))
-        return regions
+        return sorted(regions, key=region_sorting)
 
     @classmethod
     def get_vmware_region_choices(self):

awx/main/tests/unit/utils/test_common.py

@@ -174,3 +174,11 @@ def test_get_custom_venv_choices():
     with TemporaryDirectory(dir=settings.BASE_VENV_PATH) as temp_dir:
         os.makedirs(os.path.join(temp_dir, 'bin', 'activate'))
         assert common.get_custom_venv_choices() == [os.path.join(temp_dir, '')]
+
+
+def test_region_sorting():
+    s = [('Huey', 'China1'),
+         ('Dewey', 'UK1'),
+         ('Lewie', 'US1'),
+         ('All', 'All')]
+    assert [x[1] for x in sorted(s, key=common.region_sorting)] == ['All', 'US1', 'China1', 'UK1']

awx/main/utils/common.py

@@ -44,7 +44,7 @@ logger = logging.getLogger('awx.main.utils')
 
 __all__ = ['get_object_or_400', 'get_object_or_403', 'camelcase_to_underscore', 'memoize', 'memoize_delete',
            'get_ansible_version', 'get_ssh_version', 'get_licenser', 'get_awx_version', 'update_scm_url',
-           'get_type_for_model', 'get_model_for_type', 'copy_model_by_class',
+           'get_type_for_model', 'get_model_for_type', 'copy_model_by_class', 'region_sorting',
            'copy_m2m_relationships', 'prefetch_page_capabilities', 'to_python_boolean',
            'ignore_inventory_computed_fields', 'ignore_inventory_group_removal',
            '_inventory_updates', 'get_pk_from_dict', 'getattrd', 'NoDefaultProvided',
@@ -97,6 +97,14 @@ def to_python_boolean(value, allow_none=False):
         raise ValueError(_(u'Unable to convert "%s" to boolean') % six.text_type(value))
 
 
+def region_sorting(region):
+        if region[1].lower() == 'all':
+            return -1
+        elif region[1].lower().startswith('us'):
+            return 0
+        return region[1]
+
+
 def camelcase_to_underscore(s):
     '''
     Convert CamelCase names to lowercase_with_underscore.