storage: Add object type hint parameter to ObjectStorage.Get. (#69)

Some storage backends can optimize object lookup if they get
the object type that is expected. So we the signature of the Get
method is now Get(Hash, ObjectType).

Added generic tests for storage backends.

1 files changed, 2 insertions, 2 deletions

diff --git a/tree.go b/tree.go
index 3058231..de9765b 100644
--- a/tree.go
+++ b/tree.go
@@ -47,7 +47,7 @@ func (t *Tree) File(path string) (*File, error) {
 		return nil, ErrFileNotFound
 	}
 
-	obj, err := t.r.s.ObjectStorage().Get(e.Hash)
+	obj, err := t.r.s.ObjectStorage().Get(e.Hash, core.BlobObject)
 	if err != nil {
 		if err == core.ErrObjectNotFound {
 			return nil, ErrFileNotFound // a git submodule
@@ -87,7 +87,7 @@ func (t *Tree) dir(baseName string) (*Tree, error) {
 		return nil, errDirNotFound
 	}
 
-	obj, err := t.r.s.ObjectStorage().Get(entry.Hash)
+	obj, err := t.r.s.ObjectStorage().Get(entry.Hash, core.TreeObject)
 	if err != nil {
 		if err == core.ErrObjectNotFound { // git submodule
 			return nil, errDirNotFound