3 files changed, 43 insertions, 0 deletions
diff --git a/plumbing/storer/object.go b/plumbing/storer/object.go
index e793211..f1d19ef 100644
--- a/plumbing/storer/object.go
+++ b/plumbing/storer/object.go
@@ -3,6 +3,7 @@ package storer
 import (
 	"errors"
 	"io"
+	"time"
 
 	"gopkg.in/src-d/go-git.v4/plumbing"
 )
@@ -36,6 +37,9 @@ type EncodedObjectStorer interface {
 	//
 	// Valid plumbing.ObjectType values are CommitObject, BlobObject, TagObject,
 	IterEncodedObjects(plumbing.ObjectType) (EncodedObjectIter, error)
+	// HasEncodedObject returns ErrObjNotFound if the object doesn't
+	// exist.  If the object does exist, it returns nil.
+	HasEncodedObject(plumbing.Hash) error
 }
 
 // DeltaObjectStorer is an EncodedObjectStorer that can return delta
@@ -53,6 +57,34 @@ type Transactioner interface {
 	Begin() Transaction
 }
 
+// LooseObjectStorer is an optional interface for managing "loose"
+// objects, i.e. those not in packfiles.
+type LooseObjectStorer interface {
+	// ForEachObjectHash iterates over all the (loose) object hashes
+	// in the repository without necessarily having to read those objects.
+	// Objects only inside pack files may be omitted.
+	// If ErrStop is sent the iteration is stop but no error is returned.
+	ForEachObjectHash(func(plumbing.Hash) error) error
+	// LooseObjectTime looks up the (m)time associated with the
+	// loose object (that is not in a pack file). Some
+	// implementations (e.g. without loose objects)
+	// always return an error.
+	LooseObjectTime(plumbing.Hash) (time.Time, error)
+	// DeleteLooseObject deletes a loose object if it exists.
+	DeleteLooseObject(plumbing.Hash) error
+}
+
+// PackedObjectStorer is an optional interface for managing objects in
+// packfiles.
+type PackedObjectStorer interface {
+	// ObjectPacks returns hashes of object packs if the underlying
+	// implementation has pack files.
+	ObjectPacks() ([]plumbing.Hash, error)
+	// DeleteOldObjectPackAndIndex deletes an object pack and the corresponding index file if they exist.
+	// Deletion is only performed if the pack is older than the supplied time (or the time is zero).
+	DeleteOldObjectPackAndIndex(plumbing.Hash, time.Time) error
+}
+
 // PackfileWriter is a optional method for ObjectStorer, it enable direct write
 // of packfile to the storage
 type PackfileWriter interface {
diff --git a/plumbing/storer/object_test.go b/plumbing/storer/object_test.go
index 6bdd25c..6b4fe0f 100644
--- a/plumbing/storer/object_test.go
+++ b/plumbing/storer/object_test.go
@@ -132,6 +132,15 @@ func (o *MockObjectStorage) SetEncodedObject(obj plumbing.EncodedObject) (plumbi
 	return plumbing.ZeroHash, nil
 }
 
+func (o *MockObjectStorage) HasEncodedObject(h plumbing.Hash) error {
+	for _, o := range o.db {
+		if o.Hash() == h {
+			return nil
+		}
+	}
+	return plumbing.ErrObjectNotFound
+}
+
 func (o *MockObjectStorage) EncodedObject(t plumbing.ObjectType, h plumbing.Hash) (plumbing.EncodedObject, error) {
 	for _, o := range o.db {
 		if o.Hash() == h {
diff --git a/plumbing/storer/reference.go b/plumbing/storer/reference.go
index ae80a39..5e85a3b 100644
--- a/plumbing/storer/reference.go
+++ b/plumbing/storer/reference.go
@@ -24,6 +24,8 @@ type ReferenceStorer interface {
 	Reference(plumbing.ReferenceName) (*plumbing.Reference, error)
 	IterReferences() (ReferenceIter, error)
 	RemoveReference(plumbing.ReferenceName) error
+	CountLooseRefs() (int, error)
+	PackRefs() error
 }
 
 // ReferenceIter is a generic closable interface for iterating over references.