git/githistory: only update local refs

git/githistory/rewriter.go

@@ -410,10 +410,29 @@ func (r *Rewriter) commitsToMigrate(opt *RewriteOptions) ([][]byte, error) {
 // refsToMigrate returns a list of references to migrate, or an error if loading
 // those references failed.
 func (r *Rewriter) refsToMigrate() ([]*git.Ref, error) {
+	var refs []*git.Ref
+	var err error
+
 	if root, ok := r.db.Root(); ok {
-		return git.AllRefsIn(root)
+		refs, err = git.AllRefsIn(root)
+	} else {
+		refs, err = git.AllRefs()
 	}
-	return git.AllRefs()
+
+	if err != nil {
+		return nil, err
+	}
+
+	var local []*git.Ref
+	for _, ref := range refs {
+		if ref.Type == git.RefTypeRemoteBranch || ref.Type == git.RefTypeRemoteTag {
+			continue
+		}
+
+		local = append(local, ref)
+	}
+
+	return local, nil
 }
 
 // scannerOpts returns a *git.ScanRefsOptions instance to be given to the