From 04e49924fb5165862973e3b61650abfb83f54970 Mon Sep 17 00:00:00 2001
From: Michael Eischer <michael.eischer@fau.de>
Date: Sun, 1 May 2022 14:43:26 +0200
Subject: [PATCH] checker: Fix S3 legacy layout detection

---
 internal/checker/checker.go | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/internal/checker/checker.go b/internal/checker/checker.go
index 0c4d84f94..0e4310c95 100644
--- a/internal/checker/checker.go
+++ b/internal/checker/checker.go
@@ -14,6 +14,7 @@ import (
 	"github.com/minio/sha256-simd"
 	"github.com/restic/restic/internal/backend"
 	"github.com/restic/restic/internal/backend/s3"
+	"github.com/restic/restic/internal/cache"
 	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/hashing"
@@ -193,6 +194,11 @@ func IsOrphanedPack(err error) bool {
 }
 
 func isS3Legacy(b restic.Backend) bool {
+	// unwrap cache
+	if be, ok := b.(*cache.Backend); ok {
+		b = be.Backend
+	}
+
 	be, ok := b.(*s3.Backend)
 	if !ok {
 		return false