This patch is beginning of XenServer snapshots in nova. It adds:

1. A snapshot() method to the compute API
2. Snapshot to the compute drivers(), stubs for libvirt and fake, and an implementation for xenapi_conn.
3. A `glance` XenServer plugin (modeled after the current `objectstore` plugin).

To test functionally you will need to be running both the Glance API and the Glance Registry.

In order to use the cloudservers tool-chain (cloudservers command-line utility, openstack-api, etc), you will need create a project called 'openstack' or override FLAGS.default_project.

You can verify that snapshots work by using the cloudservers command-line utility to run:
    cloudservers image-create <instance-id> <my snapshot name>

The utility itself will generate an exception since we're not returning the appropriate metadata yet (that will be a future commit); however, you can confirm that the snapshot worked by checking the compute-service logs, and verifying the snapshot resides in the glance fs-store directory.

2 files changed, 8 insertions, 5 deletions

diff --git a/nova/api/openstack/auth.py b/nova/api/openstack/auth.py
index e24e58fd3..1dfdd5318 100644
--- a/nova/api/openstack/auth.py
+++ b/nova/api/openstack/auth.py
@@ -55,7 +55,8 @@ class AuthMiddleware(wsgi.Middleware):
         if not user:
             return faults.Fault(webob.exc.HTTPUnauthorized())
 
-        req.environ['nova.context'] = context.RequestContext(user, user)
+        project = self.auth.get_project(FLAGS.default_project)
+        req.environ['nova.context'] = context.RequestContext(user, project)
         return self.application
 
     def has_authentication(self, req):
diff --git a/nova/api/openstack/images.py b/nova/api/openstack/images.py
index ba35fbc78..867ee5a7e 100644
--- a/nova/api/openstack/images.py
+++ b/nova/api/openstack/images.py
@@ -25,7 +25,7 @@ import nova.image.service
 
 from nova.api.openstack import common
 from nova.api.openstack import faults
-
+from nova.compute import api as compute_api
 
 FLAGS = flags.FLAGS
 
@@ -127,9 +127,11 @@ class Controller(wsgi.Controller):
         raise faults.Fault(exc.HTTPNotFound())
 
     def create(self, req):
-        # Only public images are supported for now, so a request to
-        # make a backup of a server cannot be supproted.
-        raise faults.Fault(exc.HTTPNotFound())
+        context = req.environ['nova.context']
+        env = self._deserialize(req.body, req)
+        instance_id = env["image"]["serverId"]
+        name = env["image"]["name"]
+        return compute_api.ComputeAPI().snapshot(context, instance_id, name)
 
     def update(self, req, id):
         # Users may not modify public images, and that's all that