From d2b004c405aa1f9a6a160b93a10b64cdf2ec821f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Michael=20Mur=C3=A9?= <batolettre@gmail.com>
Date: Wed, 6 Nov 2024 18:06:46 +0100
Subject: [PATCH] meta: prevent overwrite of values

---
 pkg/meta/meta.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/meta/meta.go b/pkg/meta/meta.go
index a51eec7..552612a 100644
--- a/pkg/meta/meta.go
+++ b/pkg/meta/meta.go
@@ -99,6 +99,9 @@ func (m *Meta) GetNode(key string) (ipld.Node, error) {
 // Accepted types for the value are: bool, string, int, int32, int64, []byte,
 // and ipld.Node.
 func (m *Meta) Add(key string, val any) error {
+	if _, ok := m.Values[key]; ok {
+		return fmt.Errorf("duplicate key %q", key)
+	}
 	switch val := val.(type) {
 	case bool:
 		m.Values[key] = basicnode.NewBool(val)