Allow for a default in reflog messages

We don't have a way to represent a NULL string, so if the user passes an
empty string, let's pass NULL down so we tell libgit2 to use the default.

1 files changed, 14 insertions, 4 deletions

diff --git a/repository.go b/repository.go
index 48c2b46..e4eaaed 100644
--- a/repository.go
+++ b/repository.go
@@ -153,8 +153,13 @@ func (v *Repository) CreateReference(name string, oid *Oid, force bool, sig *Sig
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	var ptr *C.git_reference
 
@@ -179,8 +184,13 @@ func (v *Repository) CreateSymbolicReference(name, target string, force bool, si
 	csig := sig.toC()
 	defer C.free(unsafe.Pointer(csig))
 
-	cmsg := C.CString(msg)
-	defer C.free(unsafe.Pointer(cmsg))
+	var cmsg *C.char
+	if msg == "" {
+		cmsg = nil
+	} else {
+		cmsg = C.CString(msg)
+		defer C.free(unsafe.Pointer(cmsg))
+	}
 
 	var ptr *C.git_reference