Allow control of whether a user can specify a volume mount point.

Since some hypervisors don't support this feature, it makes the
field in the attach form extremely misleading.

Change-Id: I875c63d35b22b6b73314e001dbc1fbdce4363e25

horizon/dashboards/nova/volumes/forms.py

@@ -7,6 +7,7 @@
 Views for managing Nova volumes.
 """
 
+from django.conf import settings
 from django.core.urlresolvers import reverse
 from django.forms import ValidationError
 from django.utils.translation import ugettext_lazy as _
@@ -126,6 +127,15 @@ class AttachForm(forms.SelfHandlingForm):
 
     def __init__(self, *args, **kwargs):
         super(AttachForm, self).__init__(*args, **kwargs)
+
+        # Hide the device field if the hypervisor doesn't support it.
+        hypervisor_features = getattr(settings,
+                                      "OPENSTACK_HYPERVISOR_FEATURES",
+                                      {})
+        can_set_mount_point = hypervisor_features.get("can_set_mount_point",
+                                                      True)
+        if not can_set_mount_point:
+            self.fields['device'].widget = forms.widgets.HiddenInput()
         # populate volume_id
         volume = kwargs.get('initial', {}).get("volume", None)
         if volume:

horizon/dashboards/nova/volumes/tests.py

@@ -19,7 +19,9 @@
 #    under the License.
 
 from django import http
+from django.conf import settings
 from django.core.urlresolvers import reverse
+from django.forms import widgets
 from mox import IsA
 
 from horizon import api
@@ -183,20 +185,40 @@ class VolumeViewTests(test.TestCase):
         volume = self.volumes.first()
         servers = self.servers.list()
 
-        api.volume_get(IsA(http.HttpRequest), volume.id) \
-                       .AndReturn(volume)
+        api.volume_get(IsA(http.HttpRequest), volume.id).AndReturn(volume)
         api.nova.server_list(IsA(http.HttpRequest)).AndReturn(servers)
-
         self.mox.ReplayAll()
 
-        url = reverse('horizon:nova:volumes:attach',
-                      args=[volume.id])
+        url = reverse('horizon:nova:volumes:attach', args=[volume.id])
         res = self.client.get(url)
         # Asserting length of 2 accounts for the one instance option,
         # and the one 'Choose Instance' option.
-        self.assertEqual(len(res.context['form'].fields['instance']._choices),
+        form = res.context['form']
+        self.assertEqual(len(form.fields['instance']._choices),
                          2)
         self.assertEqual(res.status_code, 200)
+        self.assertTrue(isinstance(form.fields['device'].widget,
+                                   widgets.TextInput))
+
+    @test.create_stubs({api: ('volume_get',), api.nova: ('server_list',)})
+    def test_edit_attachments_cannot_set_mount_point(self):
+        PREV = settings.OPENSTACK_HYPERVISOR_FEATURES['can_set_mount_point']
+        settings.OPENSTACK_HYPERVISOR_FEATURES['can_set_mount_point'] = False
+
+        volume = self.volumes.first()
+        servers = self.servers.list()
+
+        api.volume_get(IsA(http.HttpRequest), volume.id).AndReturn(volume)
+        api.nova.server_list(IsA(http.HttpRequest)).AndReturn(servers)
+        self.mox.ReplayAll()
+
+        url = reverse('horizon:nova:volumes:attach', args=[volume.id])
+        res = self.client.get(url)
+        # Assert the device field is hidden.
+        form = res.context['form']
+        self.assertTrue(isinstance(form.fields['device'].widget,
+                                   widgets.HiddenInput))
+        settings.OPENSTACK_HYPERVISOR_FEATURES['can_set_mount_point'] = PREV
 
     @test.create_stubs({api: ('volume_get',),
                         api.nova: ('server_get', 'server_list',)})

horizon/tests/testsettings.py

@@ -141,6 +141,10 @@ OPENSTACK_KEYSTONE_BACKEND = {
     'can_edit_user': True
 }
 
+OPENSTACK_HYPERVISOR_FEATURES = {
+    'can_set_mount_point': True
+}
+
 LOGGING = {
     'version': 1,
     'disable_existing_loggers': False,

openstack_dashboard/local/local_settings.py.example

@@ -74,6 +74,10 @@ OPENSTACK_KEYSTONE_BACKEND = {
     'can_edit_user': True
 }
 
+OPENSTACK_HYPERVISOR_FEATURES = {
+    'can_set_mount_point': True
+}
+
 # OPENSTACK_ENDPOINT_TYPE specifies the endpoint type to use for the endpoints
 # in the Keystone service catalog. Use this setting when Horizon is running
 # external to the OpenStack environment. The default is 'internalURL'.