CrossRelay stage 2: Codex /v1/responses relay, config.toml manager, Codex page

internal/claudecfg/claudecfg.go

@@ -136,15 +136,28 @@ func (m *Manager) Restore() (string, error) {
 	if len(backups) == 0 {
 		return "", fmt.Errorf("no backup found in %s", m.backupDir)
 	}
-	newest := backups[0]
-	data, err := os.ReadFile(filepath.Join(m.backupDir, newest.Name))
+	return m.restoreFromLocked(backups[0].Name)
+}
+
+// RestoreFrom copies the named backup over settings.json.
+func (m *Manager) RestoreFrom(name string) (string, error) {
+	m.mu.Lock()
+	defer m.mu.Unlock()
+	if !strings.HasSuffix(name, ".json") || strings.ContainsAny(name, `/\`) {
+		return "", fmt.Errorf("invalid backup name %q", name)
+	}
+	return m.restoreFromLocked(name)
+}
+
+func (m *Manager) restoreFromLocked(name string) (string, error) {
+	data, err := os.ReadFile(filepath.Join(m.backupDir, name))
 	if err != nil {
 		return "", err
 	}
 	if err := m.writeFile(data); err != nil {
 		return "", err
 	}
-	return newest.Name, nil
+	return name, nil
 }
 
 // BackupInfo describes one backup file.