Merge pull request #48 from Microsoft/PendingUpdates

Fixed PendingUpdates call with correct query

container.go

@@ -18,6 +18,8 @@ var (
  ErrTimeout = errors.New("hcsshim: timeout waiting for notification")
 )
 
+const pendingUpdatesQuery = `{ "PropertyTypes" : ["PendingUpdates"]}`
+
 type ContainerError struct {
  Container *container
  Operation string
@@ -273,12 +275,12 @@ func (container *container) hcsWait(timeout uint32) (bool, error) {
  return waitForSingleObject(exitEvent, timeout)
 }
 
-func (container *container) properties() (*containerProperties, error) {
+func (container *container) properties(query string) (*containerProperties, error) {
  var (
  resultp *uint16
  propertiesp *uint16
  )
- err := hcsGetComputeSystemProperties(container.handle, "", &propertiesp, &resultp)
+ err := hcsGetComputeSystemProperties(container.handle, query, &propertiesp, &resultp)
  err = processHcsResult(err, resultp)
  if err != nil {
  return nil, err
@@ -302,7 +304,7 @@ func (container *container) HasPendingUpdates() (bool, error) {
  operation := "HasPendingUpdates"
  title := "HCSShim::Container::" + operation
  logrus.Debugf(title+" id=%s", container.id)
- properties, err := container.properties()
+ properties, err := container.properties(pendingUpdatesQuery)
  if err != nil {
  err := &ContainerError{Container: container, Operation: operation, Err: err}
  logrus.Error(err)