fix

Author: wxiaoguang

Diff for: cmd/web_acme.go

@@ -54,8 +54,11 @@ func runACME(listenAddr string, m http.Handler) error {
 		altTLSALPNPort = p
 	}
 
-	magic := certmagic.NewDefault()
+	magic := &certmagic.Default
 	magic.Storage = &certmagic.FileStorage{Path: setting.AcmeLiveDirectory}
+	if magic.Storage != certmagic.Default.Storage {
+		return fmt.Errorf("failed to set certmagic storage")
+	}
 	// Try to use private CA root if provided, otherwise defaults to system's trust
 	var certPool *x509.CertPool
 	if setting.AcmeCARoot != "" {