manifest code calls TarLayer() and gets archive. This archive needs to
be closed once caller is done using it to release the resrouces held
by archive. For the devicemapper graphdriver, archive keeps a device
mounted (device which is backing the layer). If archive.Close() is not
called, that device remains mounted and later deletion of device fails
leading to various other issues.
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Before the V2 registry changes, images with no config could be pushed.
This change fixes a regression that made those images not able to be
pushed to a registry.
Signed-off-by: Euan Kemp <euank@euank.com>
