lfsutil: add `Storager` interface and local storage (#6083)

* Add Storager interface

* Add tests

* Add back note

* Add tests for basic protocol routes

* Fix lint errors

1 files changed, 4 insertions, 0 deletions

diff --git a/internal/lfsutil/oid.go b/internal/lfsutil/oid.go
index 16d0ad3d..ad19bd5b 100644
--- a/internal/lfsutil/oid.go
+++ b/internal/lfsutil/oid.go
@@ -5,6 +5,8 @@
 package lfsutil
 
 import (
+	"github.com/pkg/errors"
+
 	"gogs.io/gogs/internal/lazyregexp"
 )
 
@@ -15,6 +17,8 @@ type OID string
 // Spec: https://github.com/git-lfs/git-lfs/blob/master/docs/spec.md
 var oidRe = lazyregexp.New("^[a-f0-9]{64}$")
 
+var ErrInvalidOID = errors.New("OID is not valid")
+
 // ValidOID returns true if given oid is valid.
 func ValidOID(oid OID) bool {
 	return oidRe.MatchString(string(oid))