fix

docs/source/reference/faq.rst

@@ -103,19 +103,19 @@ By default, SkyPilot supports most global regions on AWS and only supports the U
   version=$(python -c 'import sky; print(sky.clouds.service_catalog.constants.CATALOG_SCHEMA_VERSION)')
   mkdir -p ~/.sky/catalogs/${version}
   cd ~/.sky/catalogs/${version}
-  # Fetch the US region for GCP
+  # Fetch U.S. regions region for GCP
   python -m sky.clouds.service_catalog.data_fetchers.fetch_gcp
   # Fetch all regions for GCP
   pip install lxml
   python -m sky.clouds.service_catalog.data_fetchers.fetch_gcp --all-regions
 
-  # Fetch the US region for Azure
+  # Fetch U.S. regions region for Azure
   python -m sky.clouds.service_catalog.data_fetchers.fetch_azure
   # Fetch all regions for Azure
   python -m sky.clouds.service_catalog.data_fetchers.fetch_azure --all-regions
   # Fetch the specified regions for Azure
   python -m sky.clouds.service_catalog.data_fetchers.fetch_azure --regions japaneast australiaeast uksouth
-  # Exclude the specified regions for Azure
+  # Fetch U.S. regions for Azure, excluding the specified regions
   python -m sky.clouds.service_catalog.data_fetchers.fetch_azure --exclude centralus eastus
 
 To make your managed spot jobs potentially use all global regions, please log into the spot controller with ``ssh sky-spot-controller-<hash>`` 

sky/clouds/service_catalog/data_fetchers/fetch_azure.py

@@ -266,9 +266,12 @@ def get_additional_columns(row):
         region_filter = set(get_regions()) - EXCLUDED_REGIONS
     else:
         region_filter = US_REGIONS
-    region_filter = set(region_filter) - set(
+    region_filter = region_filter - set(
         args.exclude) if args.exclude else region_filter
 
+    if not region_filter:
+        raise ValueError('No regions to fetch. Please check your arguments.')
+
     instance_df = get_all_regions_instance_types_df(region_filter)
     os.makedirs('azure', exist_ok=True)
     instance_df.to_csv('azure/vms.csv', index=False)