Restrict VirtualMachines node pool manual profile vm_sizes field to support single sku size

src/aks-preview/HISTORY.rst

@@ -15,6 +15,7 @@ Pending
 14.0.0b5
 ++++++++
 * Re-generate the SDK for API version 2025-02-02-preview with @autorest/[email protected] to fix `\#31345 <https://github.com/Azure/azure-cli/issues/31345>`_.
+* [BREAKING CHANGE] Change `--vm-sizes` for VirtualMachines manual profile to awalys support single SKU size.
 
 14.0.0b4
 ++++++++

src/aks-preview/azext_aks_preview/agentpool_decorator.py

@@ -982,12 +982,14 @@ def set_up_virtual_machines_profile(self, agentpool: AgentPool) -> AgentPool:
             return agentpool
 
         sizes = self.context.get_vm_sizes()
+        if len(sizes) != 1:
+            raise InvalidArgumentValueError(f"We only accept single sku size for manual profile. {sizes} is invalid.")
         count, _, _, _ = self.context.get_node_count_and_enable_cluster_autoscaler_min_max_count()
         agentpool.virtual_machines_profile = self.models.VirtualMachinesProfile(
             scale=self.models.ScaleProfile(
                 manual=[
                     self.models.ManualScaleProfile(
-                        sizes=sizes,
+                        size=sizes[0],
                         count=count,
                     )
                 ]

src/aks-preview/azext_aks_preview/custom.py

@@ -1680,7 +1680,9 @@ def aks_agentpool_manual_scale_add(cmd,
         operation_group="managed_clusters",
     )
     sizes = [x.strip() for x in vm_sizes.split(",")]
-    new_manual_scale_profile = ManualScaleProfile(sizes=sizes, count=int(node_count))
+    if len(sizes) != 1:
+        raise ClientRequestError("We only accept single sku size for manual profile.")
+    new_manual_scale_profile = ManualScaleProfile(size=sizes[0], count=int(node_count))
     instance.virtual_machines_profile.scale.manual.append(new_manual_scale_profile)
 
     return sdk_no_wait(
@@ -1710,19 +1712,25 @@ def aks_agentpool_manual_scale_update(cmd,    # pylint: disable=unused-argument
         raise ClientRequestError("Cannot update manual in a non-virtualmachines node pool.")
 
     _current_vm_sizes = [x.strip() for x in current_vm_sizes.split(",")]
+    if len(_current_vm_sizes) != 1:
+        raise InvalidArgumentValueError(
+            f"We only accept single sku size for manual profile. {current_vm_sizes} is invalid."
+        )
     _vm_sizes = [x.strip() for x in vm_sizes.split(",")] if vm_sizes else []
+    if len(_vm_sizes) != 1:
+        raise InvalidArgumentValueError(f"We only accept single sku size for manual profile. {vm_sizes} is invalid.")
     manual_exists = False
     for m in instance.virtual_machines_profile.scale.manual:
-        if m.sizes == _current_vm_sizes:
+        if m.size == _current_vm_sizes[0]:
             manual_exists = True
             if vm_sizes:
-                m.sizes = _vm_sizes
+                m.size = _vm_sizes[0]
             if node_count:
                 m.count = int(node_count)
             break
     if not manual_exists:
         raise InvalidArgumentValueError(
-            f"Manual with sizes {current_vm_sizes} doesn't exist in node pool {nodepool_name}"
+            f"Manual with size {current_vm_sizes[0]} doesn't exist in node pool {nodepool_name}"
         )
 
     return sdk_no_wait(
@@ -1746,15 +1754,19 @@ def aks_agentpool_manual_scale_delete(cmd,    # pylint: disable=unused-argument
     if instance.type_properties_type != CONST_VIRTUAL_MACHINES:
         raise CLIError("Cannot delete manual in a non-virtualmachines node pool.")
     _current_vm_sizes = [x.strip() for x in current_vm_sizes.split(",")]
+    if len(_current_vm_sizes) != 1:
+        raise InvalidArgumentValueError(
+            f"We only accept single sku size for manual profile. {current_vm_sizes} is invalid."
+        )
     manual_exists = False
     for m in instance.virtual_machines_profile.scale.manual:
-        if m.sizes == _current_vm_sizes:
+        if m.size == _current_vm_sizes[0]:
             manual_exists = True
             instance.virtual_machines_profile.scale.manual.remove(m)
             break
     if not manual_exists:
         raise InvalidArgumentValueError(
-            f"Manual with sizes {current_vm_sizes} doesn't exist in node pool {nodepool_name}"
+            f"Manual with size {current_vm_sizes[0]} doesn't exist in node pool {nodepool_name}"
         )
 
     return sdk_no_wait(