[RDBMS] az postgres flexible-server upgrade: Add server capability API check to the --version parameter and allow user to upgrade to PG17 when it is available

src/azure-cli/azure/cli/command_modules/rdbms/_flexible_server_location_capabilities_util.py

@@ -7,6 +7,7 @@
 from azure.cli.core.azclierror import InvalidArgumentValueError
 from azure.core.paging import ItemPaged
 from ._client_factory import cf_postgres_flexible_location_capabilities, cf_postgres_flexible_server_capabilities
+from collections import defaultdict
 
 
 def get_postgres_location_capability_info(cmd, location):
@@ -99,12 +100,17 @@ def _postgres_parse_list_capability(result):
     for version in result[0].supported_server_versions:
         versions.add(version.name)
 
+    supported_server_versions = defaultdict(list)
+    for version in result[0].supported_server_versions:
+        supported_server_versions[version.name] = version.supported_versions_to_upgrade
+
     return {
         'sku_info': tiers_dict,
         'single_az': single_az,
         'geo_backup_supported': geo_backup_supported,
         'zones': zones,
         'server_versions': versions,
+        'supported_server_versions': supported_server_versions,
         'index_tuning_supported': index_tuning_supported
     }
 

src/azure-cli/azure/cli/command_modules/rdbms/_helptext_pg.py

@@ -909,8 +909,8 @@
 type: command
 short-summary: Upgrade the major version of a flexible server.
 examples:
-  - name: Upgrade server 'testsvr' to PostgreSQL major version 16.
-    text: az postgres flexible-server upgrade -g testgroup -n testsvr -v 16
+  - name: Upgrade server 'testsvr' to PostgreSQL major version 17.
+    text: az postgres flexible-server upgrade -g testgroup -n testsvr -v 17
 """
 
 helps['postgres flexible-server identity'] = """

src/azure-cli/azure/cli/command_modules/rdbms/_params.py

@@ -459,7 +459,7 @@ def _flexible_server_params(command_group):
         )
 
         pg_version_upgrade_arg_type = CLIArgumentType(
-            arg_type=get_enum_type(['12', '13', '14', '15', '16']),
+            arg_type=get_enum_type(['12', '13', '14', '15', '16', '17']),
             options_list=['--version', '-v'],
             help='Server major version.'
         )

src/azure-cli/azure/cli/command_modules/rdbms/flexible_server_custom_common.py

@@ -16,6 +16,7 @@
 from ._client_factory import cf_postgres_flexible_replica
 from ._flexible_server_util import run_subprocess, \
     fill_action_template, get_git_root_dir, resolve_poller, GITHUB_ACTION_PATH
+from ._flexible_server_location_capabilities_util import get_postgres_server_capability_info
 from .validators import validate_public_access_server, validate_resource_group, check_resource_group, validate_citus_cluster
 
 logger = get_logger(__name__)
@@ -304,6 +305,19 @@ def flexible_server_version_upgrade(cmd, client, resource_group_name, server_nam
                        "We recommend selecting PostgreSQL 13 or a later version for "
                        "all future operations.")
 
+    list_server_capability_info = get_postgres_server_capability_info(cmd, resource_group_name, server_name)
+    eligible_versions = list_server_capability_info['supported_server_versions'][str(current_version)]
+
+    if version not in eligible_versions:
+        # version not supported
+        error_message = ""
+        if len(eligible_versions) > 0:
+            error_message = "Server is running version {}. It can only be upgraded to the following versions: {} ".format(str(current_version), eligible_versions)
+        else:
+            error_message = "Server is running version {}. It cannot be upgraded to any higher version. ".format(str(current_version))
+
+        raise CLIError(error_message)
+
     replica_operations_client = cf_postgres_flexible_replica(cmd.cli_ctx, '_')
     version_mapped = version