1 files changed, 5 insertions, 0 deletions
diff --git a/config.go b/config.go
index f110ace..9e10d20 100644
--- a/config.go
+++ b/config.go
@@ -19,6 +19,11 @@ func (all *Repos) ConfigSave(fname string) error {
 		return errors.New("gitpb.ConfigSave() repos == nil")
 	}
 
+	if _, s := filepath.Split(fname); s != "repos.pb" {
+		log.Infof("ConfigSave() filename '%s' invalid\n", fname)
+		return log.Errorf("ConfigSave() filename '%s' invalid\n", fname)
+	}
+
 	data, err := all.Marshal()
 	if err != nil {
 		log.Info("gitpb proto.Marshal() failed len", len(data), err)