vm size idempotence (#45108)

lib/ansible/modules/cloud/azure/azure_rm_virtualmachine.py

@@ -901,6 +901,13 @@ class AzureRMVirtualMachine(AzureRMModuleBase):
                     changed = True
                     vm_dict['properties']['storageProfile']['osDisk']['diskSizeGB'] = self.os_disk_size_gb
 
+                if self.vm_size and \
+                   self.vm_size != vm_dict['properties']['hardwareProfile']['vmSize']:
+                    self.log('CHANGED: virtual machine {0} - size '.format(self.name))
+                    differences.append('VM size')
+                    changed = True
+                    vm_dict['properties']['hardwareProfile']['vmSize'] = self.vm_size
+
                 update_tags, vm_dict['tags'] = self.update_tags(vm_dict.get('tags', dict()))
                 if update_tags:
                     differences.append('Tags')

test/integration/targets/azure_rm_virtualmachine/tasks/virtualmachine.yml

@@ -192,6 +192,31 @@
 - assert:
       that: not output.changed
 
+- name: Resize VM
+  azure_rm_virtualmachine:
+      resource_group: "{{ resource_group }}"
+      name: "{{ vm_name1 }}"
+      vm_size: Standard_A1
+      storage_account: "{{ storage_account }}"
+      storage_container: "{{ vm_name1 }}"
+      storage_blob: "{{ vm_name1 }}.vhd"
+      admin_username: adminuser
+      admin_password: Password123!
+      short_hostname: testvm
+      os_type: Linux
+      network_interfaces: "{{ vm_name1 }}"
+      image:
+        offer: UbuntuServer
+        publisher: Canonical
+        sku: 16.04-LTS
+        version: latest
+  register: output
+
+- assert:
+      that:
+        - output.changed
+        - output.ansible_facts.azure_vm.properties.hardwareProfile.vmSize == "Standard_A1"
+
 - name: Delete VM
   azure_rm_virtualmachine:
       resource_group: "{{ resource_group }}"