Add ephemeral OS disk for azure_rm_virtualmachine

plugins/modules/azure_rm_virtualmachine.py

@@ -175,6 +175,12 @@
             - Windows
             - Linux
         default: Linux
+    ephemeral_os_disk:
+        description:
+            - Parameters of ephemeral disk settings that can be specified for operating system disk.
+            - Ephemeral OS disk is only supported for VMS Instances using Managed Disk.
+        type: bool
+        default: False
     data_disks:
         description:
             - Describes list of data disks.
@@ -847,6 +853,7 @@ def __init__(self):
             vm_identity=dict(type='str', choices=['SystemAssigned']),
             winrm=dict(type='list'),
             boot_diagnostics=dict(type='dict'),
+            ephemeral_os_disk=dict(type='bool'),
         )
 
         self.resource_group = None
@@ -891,6 +898,7 @@ def __init__(self):
         self.license_type = None
         self.vm_identity = None
         self.boot_diagnostics = None
+        self.ephemeral_os_disk = None
 
         self.results = dict(
             changed=False,
@@ -1054,6 +1062,13 @@ def exec_module(self, **kwargs):
                 differences = []
                 current_nics = []
                 results = vm_dict
+                current_osdisk = vm_dict['properties']['storageProfile']['osDisk']
+                current_ephemeral = current_osdisk.get('diffDiskSettings', None)
+
+                if self.ephemeral_os_disk and current_ephemeral is None:
+                    self.fail('Ephemeral OS disk not updatable: virtual machine ephemeral OS disk is {0}'.format(self.ephemeral_os_disk))
+                elif not self.ephemeral_os_disk and current_ephemeral is not None:
+                    self.fail('Ephemeral OS disk not updatable: virtual machine ephemeral OS disk is {0}'.format(self.ephemeral_os_disk))
 
                 # Try to determine if the VM needs to be updated
                 if self.network_interface_names:
@@ -1294,7 +1309,8 @@ def exec_module(self, **kwargs):
                                 managed_disk=managed_disk,
                                 create_option=self.compute_models.DiskCreateOptionTypes.from_image,
                                 caching=self.os_disk_caching,
-                                disk_size_gb=self.os_disk_size_gb
+                                disk_size_gb=self.os_disk_size_gb,
+                                diff_disk_settings=self.compute_models.DiffDiskSettings(option='Local') if self.ephemeral_os_disk else None
                             ),
                             image_reference=image_reference,
                         ),

tests/integration/targets/azure_rm_virtualmachine/tasks/azure_test_ephemeral_os.yml

@@ -0,0 +1,101 @@
+- include_tasks: setup.yml
+
+- name: Create minimal VM with defaults
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}"
+    admin_username: "testuser"
+    admin_password: "Pass123$$$abx!"
+    vm_size: Standard_DS2_v2
+    image:
+      offer: UbuntuServer
+      publisher: Canonical
+      sku: 16.04-LTS
+      version: latest
+  register: vm_output
+
+- name: Generalize VM
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}"
+    generalized: yes
+
+- name: Create an image from VM
+  azure_rm_image:
+    resource_group: "{{ resource_group }}"
+    source: "{{ vm_name }}"
+    name: testimage
+    os_type: Linux
+  register: output
+
+- assert:
+    that:
+      - output.changed
+
+- name: Create virtual machine ephmeral OS disk
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}-02"
+    admin_username: "testuser"
+    admin_password: "Pass123$$$abx!"
+    vm_size: Standard_DS2_v2
+    os_disk_caching: ReadOnly
+    ephemeral_os_disk: True
+    image: testimage
+  register: output
+
+- assert:
+    that:
+      - output.changed
+      - output.ansible_facts.azure_vm.properties.storageProfile.osDisk.diffDiskSettings.option == 'Local'
+
+- name: Check virtual machine ephmeral OS disk idempotent
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}-02"
+    admin_username: "testuser"
+    admin_password: "Pass123$$$abx!"
+    vm_size: Standard_DS2_v2
+    os_disk_caching: ReadOnly
+    ephemeral_os_disk: True
+    image: testimage
+  register: output
+
+- assert:
+    that:
+      - not output.changed
+
+- name: Check virtual machine ephmeral OS disk can't update
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}-02"
+    admin_username: "testuser"
+    admin_password: "Pass123$$$abx!"
+    vm_size: Standard_DS2_v2
+    os_disk_caching: ReadOnly
+    ephemeral_os_disk: False
+    image: testimage
+  ignore_errors: yes
+  register: ouput
+
+- assert:
+    that:
+      - not output.changed
+
+- name: Delete VM
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}"
+    state: absent
+
+- name: Delete VM
+  azure_rm_virtualmachine:
+    resource_group: "{{ resource_group }}"
+    name: "{{ vm_name }}-02"
+    state: absent
+
+- name: Create an image from VM
+  azure_rm_image:
+    resource_group: "{{ resource_group }}"
+    name: testimage
+    state: absent