overlay datastore

circle/dashboard/templates/dashboard/template-edit.html

@@ -69,6 +69,7 @@
         {{ form.lease|as_crispy_field }}
 
         {{ form.tags|as_crispy_field }}
+        {{ form.overlay_path|as_crispy_field }}
         </fieldset>
 
         <input type="submit" value="{% trans "Save changes" %}" class="btn btn-primary">

circle/storage/models.py

@@ -319,7 +319,7 @@ class Disk(TimeStampedModel):
         except ObjectDoesNotExist:
             return None
 
-    def get_exclusive(self):
+    def get_exclusive(self, datastore=None):
         """Get an instance of the disk for exclusive usage.
 
         This method manipulates the database only.
@@ -335,7 +335,7 @@ class Disk(TimeStampedModel):
 
         new_type = type_mapping[self.type]
 
-        return Disk.create(base=self, datastore=self.datastore,
+        return Disk.create(base=self, datastore=self.datastore if datastore is None else datastore,
                            name=self.name, size=self.size,
                            type=new_type, dev_num=self.dev_num)
 

circle/vm/migrations/0018_instancetemplate_overlay_path.py

+# Generated by Django 3.2.3 on 2023-09-14 15:29
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('vm', '0017_auto_20221231_1011'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='instancetemplate',
+            name='overlay_path',
+            field=models.CharField(default='', help_text='Overlay images destination path. If empty, the location of the base image.', max_length=500, verbose_name='overlay_path'),
+        ),
+    ]

circle/vm/migrations/0019_alter_instancetemplate_overlay_path.py

+# Generated by Django 3.2.3 on 2023-09-18 08:53
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('storage', '0007_disk_cache_size'),
+        ('vm', '0018_instancetemplate_overlay_path'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='instancetemplate',
+            name='overlay_path',
+            field=models.ForeignKey(blank=True, help_text='Overlay images destination path. If empty, the location of the base image.', null=True, on_delete=django.db.models.deletion.CASCADE, to='storage.datastore', verbose_name='overlay destination'),
+        ),
+    ]

circle/vm/models/instance.py

@@ -209,6 +209,8 @@ class InstanceTemplate(AclBase, VirtualMachineDescModel, TimeStampedModel):
                             related_name='template_set',
                             help_text=_('Disks which are to be mounted.'))
     owner = ForeignKey(User, on_delete=models.CASCADE)
+    overlay_path = ForeignKey('storage.DataStore', verbose_name=_("overlay destination"),  null=True, blank=True,
+                           help_text=_("Overlay images destination path. If empty, the location of the base image."), on_delete=models.CASCADE)
 
     class Meta:
         app_label = 'vm'
@@ -547,6 +549,7 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
                 raise PermissionDenied()
             
         # create instance and do additional setup
+        datastore = params.pop("overlay_path", None)
         inst = cls(**params)
         #if not params["num_cores_max"]:
         #inst.num_cores_max = inst.num_cores
@@ -562,7 +565,8 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
                            readable_name=ugettext_noop("create instance"),
                            on_commit=__on_commit, user=inst.owner) as act:
             # create related entities
-            inst.disks.add(*[disk.get_exclusive() for disk in disks])
+            inst.disks.add(*[disk.get_exclusive(datastore=None if datastore == "" 
+                                    else datastore) for disk in disks])
 
             for net in networks:
                 Interface.create(instance=inst, vlan=net.vlan,
@@ -610,7 +614,7 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
         common_fields = ['name', 'description', 'num_cores', 'num_cores_max','ram_size',
                          'max_ram_size', 'arch', 'priority', 'boot_menu',
                          'raw_data', 'lease', 'access_method', 'system',
-                         'cloud_init', 'ci_meta_data', 'ci_user_data', 'ci_network_config', 'has_agent']
+                         'cloud_init', 'ci_meta_data', 'ci_user_data', 'ci_network_config', 'has_agent', 'overlay_path']
         params = dict(template=template, owner=owner, pw=pwgen())
         params.update([(f, getattr(template, f)) for f in common_fields])
         params.update(kwargs)  # override defaults w/ user supplied values