add custom refdb backend support

refdb.go

@@ -0,0 +1,50 @@
+package git
+
+/*
+#include <git2.h>
+#include <git2/errors.h>
+
+extern void _go_git_refdb_backend_free(git_refdb_backend *backend);
+*/
+import "C"
+import (
+	"runtime"
+)
+
+type Refdb struct {
+	ptr *C.git_refdb
+}
+
+type RefdbBackend struct {
+	ptr *C.git_refdb_backend
+}
+
+func (v *Repository) NewRefdb() (refdb *Refdb, err error) {
+	refdb = new(Refdb)
+
+	ret := C.git_refdb_new(&refdb.ptr, v.ptr)
+	if ret < 0 {
+		return nil, LastError()
+	}
+
+	runtime.SetFinalizer(refdb, (*Refdb).Free)
+	return
+}
+
+func NewRefdbBackendFromC(ptr *C.git_refdb_backend) (backend *RefdbBackend) {
+	backend = &RefdbBackend{ptr}
+	return
+}
+
+func (v *Refdb) SetBackend(backend *RefdbBackend) (err error) {
+	ret := C.git_refdb_set_backend(v.ptr, backend.ptr)
+	if ret < 0 {
+		backend.Free()
+		err = LastError()
+	}
+	return
+}
+
+func (v *RefdbBackend) Free() {
+	C._go_git_refdb_backend_free(v.ptr)
+}

repository.go

@@ -15,6 +15,10 @@ type Repository struct {
 	ptr *C.git_repository
 }
 
+func (v *Repository) Pointer() *C.git_repository {
+	return v.ptr
+}
+
 func OpenRepository(path string) (*Repository, error) {
 	repo := new(Repository)
 
@@ -63,6 +67,11 @@ func NewRepositoryWrapOdb(odb *Odb) (repo *Repository, err error) {
 	return
 }
 
+func (v *Repository) SetRefdb(refdb *Refdb) {
+	C.git_repository_set_refdb(v.ptr, refdb.ptr)
+	return
+}
+
 func (v *Repository) Free() {
 	runtime.SetFinalizer(v, nil)
 	C.git_repository_free(v.ptr)
@@ -269,6 +278,11 @@ func (v *Odb) Free() {
 	C.git_odb_free(v.ptr)
 }
 
+func (v *Refdb) Free() {
+	runtime.SetFinalizer(v, nil)
+	C.git_refdb_free(v.ptr)
+}
+
 func (v *Repository) Odb() (odb *Odb, err error) {
 	odb = new(Odb)
 

wrapper.c

@@ -1,6 +1,7 @@
 #include "_cgo_export.h"
 #include "git2.h"
 #include "git2/sys/odb_backend.h"
+#include "git2/sys/refdb_backend.h"
 #include "git2/submodule.h"
 #include "git2/pack.h"
 
@@ -33,4 +34,12 @@ void _go_git_odb_backend_free(git_odb_backend *backend)
 
     return;
 }
+
+void _go_git_refdb_backend_free(git_refdb_backend *backend)
+{
+    if (backend->free)
+      backend->free(backend);
+
+    return;
+}
 /* EOF */