fix(S3): handle empty directory

@xen-orchestra/fs/src/s3.js

@@ -77,9 +77,7 @@ export default class S3Handler extends RemoteHandlerAbstract {
     })
 
     // Workaround for https://github.com/aws/aws-sdk-js-v3/issues/2673
-    this._s3.middlewareStack.use(
-      getApplyMd5BodyChecksumPlugin(this._s3.config)
-    )
+    this._s3.middlewareStack.use(getApplyMd5BodyChecksumPlugin(this._s3.config))
 
     const parts = split(path)
     this._bucket = parts.shift()
@@ -99,7 +97,12 @@ export default class S3Handler extends RemoteHandlerAbstract {
   }
 
   _makePrefix(dir) {
-    return join(this._dir, dir, '/')
+    const prefix = join(this._dir, dir, '/')
+
+    // no prefix for root
+    if (prefix !== './') {
+      return prefix
+    }
   }
 
   _createParams(file) {

CHANGELOG.unreleased.md

@@ -11,6 +11,8 @@
 
 > Users must be able to say: “I had this issue, happy to know it's fixed”
 
+- [S3] Fix S3 remote with empty directory not showing anything to restore (PR [#6218](https://github.com/vatesfr/xen-orchestra/pull/6218))
+
 ### Packages to release
 
 > Packages will be released in the order they are here, therefore, they should
@@ -33,5 +35,11 @@
 
 <!--packages-start-->
 
+- @xen-orchestra/fs patch
+- vhd-cli patch
+- @xen-orchestra/backups patch
+- xo-server patch
+- @xen-orchestra/backups-cli patch
+- @xen-orchestra/proxy patch
 
 <!--packages-end-->