fix podman container exists and diff for storage containers

Current these commands only check if a container exists in libpod. With
this fix, the commands will also check if they are in containers/storage.

This allows users to look at differences within a buildah or CRI-O container.

Currently buildah diff does not exists, so this helps out in that situation
as well as in CRI-O since the cri does not implement a diff command.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/libpod/runtime_cstorage.go b/libpod/runtime_cstorage.go
index 03eebeefc..61fdd42d3 100644
--- a/libpod/runtime_cstorage.go
+++ b/libpod/runtime_cstorage.go
@@ -52,6 +52,10 @@ func (r *Runtime) ListStorageContainers() ([]*StorageContainer, error) {
 	return finalCtrs, nil
 }
 
+func (r *Runtime) StorageContainer(idOrName string) (*storage.Container, error) {
+	return r.store.Container(idOrName)
+}
+
 // RemoveStorageContainer removes a container from c/storage.
 // The container WILL NOT be removed if it exists in libpod.
 // Accepts ID or full name of container.