vm: add redeploy operation

Closes #262

circle/dashboard/forms.py

@@ -770,6 +770,17 @@ class VmStateChangeForm(forms.Form):
         return helper
 
 
+class RedeployForm(forms.Form):
+    with_emergency_change_state = forms.BooleanField(
+        required=False, initial=True, label=_("use emergency state change"))
+
+    @property
+    def helper(self):
+        helper = FormHelper(self)
+        helper.form_tag = False
+        return helper
+
+
 class VmCreateDiskForm(forms.Form):
     name = forms.CharField(max_length=100, label=_("Name"))
     size = forms.CharField(

circle/dashboard/views/vm.py

@@ -58,7 +58,7 @@ from ..forms import (
     AclUserOrGroupAddForm, VmResourcesForm, TraitsForm, RawDataForm,
     VmAddInterfaceForm, VmCreateDiskForm, VmDownloadDiskForm, VmSaveForm,
     VmRenewForm, VmStateChangeForm, VmListSearchForm, VmCustomizeForm,
-    TransferOwnershipForm, VmDiskResizeForm,
+    TransferOwnershipForm, VmDiskResizeForm, RedeployForm,
 )
 from ..models import Favourite, Profile
 
@@ -599,6 +599,15 @@ class VmStateChangeView(FormOperationMixin, VmOperationView):
         return val
 
 
+class RedeployView(FormOperationMixin, VmOperationView):
+    op = 'redeploy'
+    icon = 'stethoscope'
+    effect = 'danger'
+    show_in_toolbar = True
+    form_class = RedeployForm
+    wait_for_result = 0.5
+
+
 vm_ops = OrderedDict([
     ('deploy', VmOperationView.factory(
         op='deploy', icon='play', effect='success')),
@@ -620,6 +629,7 @@ vm_ops = OrderedDict([
     ('recover', VmOperationView.factory(
         op='recover', icon='medkit', effect='warning')),
     ('nostate', VmStateChangeView),
+    ('redeploy', RedeployView),
     ('destroy', VmOperationView.factory(
         extra_bases=[TokenOperationView],
         op='destroy', icon='times', effect='danger')),

circle/vm/models/instance.py

@@ -275,6 +275,7 @@ class Instance(AclBase, VirtualMachineDescModel, StatusModel, OperatedMixin,
             ('change_resources', _('Can change resources of a running VM.')),
             ('set_resources', _('Can change resources of a new VM.')),
             ('create_vm', _('Can create a new VM.')),
+            ('redeploy', _('Can redeploy a VM.')),
             ('config_ports', _('Can configure port forwards.')),
             ('recover', _('Can recover a destroyed VM.')),
             ('emergency_change_state', _('Can change VM state to NOSTATE.')),

circle/vm/operations.py

@@ -827,6 +827,33 @@ class ChangeStateOperation(InstanceOperation):
             self.instance.save()
 
 
+@register_operation
+class RedeployOperation(InstanceOperation):
+    activity_code_suffix = 'redeploy'
+    id = 'redeploy'
+    name = _("redeploy")
+    description = _("Change the virtual machine state to NOSTATE "
+                    "and redeploy the VM. This operation allows starting "
+                    "machines formerly running on a failed node.")
+    acl_level = "owner"
+    required_perms = ('vm.redeploy', )
+    concurrency_check = False
+
+    def _operation(self, user, activity, with_emergency_change_state=True):
+        if with_emergency_change_state:
+            ChangeStateOperation(self.instance).call(
+                parent_activity=activity, user=user,
+                new_state='NOSTATE', interrupt=False, reset_node=True)
+        else:
+            ShutOffOperation(self.instance).call(
+                parent_activity=activity, user=user)
+
+        self.instance._update_status()
+
+        DeployOperation(self.instance).call(
+            parent_activity=activity, user=user)
+
+
 class NodeOperation(Operation):
     async_operation = abortable_async_node_operation
     host_cls = Node