d643f1dc88
When client uses Pull action to pull image, it will limit the number of manifest as one. But Unpack action will call Manifest to traverse all the manifests including non-dowloaded one. If the platform has more than one manifest, the Pull with unpack action will fail. And also, there is no need to read non-best matched manifest. Therefore, the Manifest can do the sort earlier. Signed-off-by: Wei Fu <fuweid89@gmail.com>