From cb0dac6448bbc337cd015ad4b4b3d1da3f14a561 Mon Sep 17 00:00:00 2001
From: Mateusz Poliwczak <mpoliwczak34@gmail.com>
Date: Thu, 11 May 2023 09:33:24 +0200
Subject: [PATCH] clean cache on fs.ErrNotExist and  fs.ErrPermission

---
 src/net/hosts.go | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/src/net/hosts.go b/src/net/hosts.go
index 0e5a30bb47..56e6674144 100644
--- a/src/net/hosts.go
+++ b/src/net/hosts.go
@@ -7,6 +7,7 @@ package net
 import (
 	"errors"
 	"internal/bytealg"
+	"io/fs"
 	"net/netip"
 	"sync"
 	"time"
@@ -66,10 +67,7 @@ func readHosts() {
 
 	file, err := open(hp)
 	if err != nil {
-		// Return only on temporary errors (EMFILE, ENFILE), so that
-		// the hosts cache gets cleaned up on errors like: access, file not exist.
-		var temporary interface{ Temporary() bool }
-		if errors.As(err, &temporary) && temporary.Temporary() {
+		if !errors.Is(err, fs.ErrNotExist) && !errors.Is(err, fs.ErrPermission) {
 			return
 		}
 	}