From e7d447e39acb3dfa760a1ff1aaa211f7c76c30a9 Mon Sep 17 00:00:00 2001
From: Adrian Sutton <adrian@oplabs.co>
Date: Sun, 2 Jun 2024 00:15:26 +1000
Subject: [PATCH] external-geth: Fix lint error by checking error (#10713)

---
 op-e2e/external_geth/main.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/op-e2e/external_geth/main.go b/op-e2e/external_geth/main.go
index dc965131f94e..f68fbd073be2 100644
--- a/op-e2e/external_geth/main.go
+++ b/op-e2e/external_geth/main.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"os/signal"
@@ -176,7 +177,9 @@ func execute(binPath string, config external.Config) (*gethSession, error) {
 		}
 		var authString string
 		var port int
-		fmt.Fscanf(sess.Err, "%d %s", &port, &authString)
+		if _, err := fmt.Fscanf(sess.Err, "%d %s", &port, &authString); err != nil && !errors.Is(err, io.EOF) {
+			return nil, fmt.Errorf("error while reading auth string: %w", err)
+		}
 		switch authString {
 		case "auth=true":
 			enginePort = port