feat(xo-server/backupNg): support restoring directories (#3300)

See #1924

packages/xo-server/src/xo-mixins/file-restore-ng.js

@@ -34,12 +34,30 @@ const PARTITION_TYPE_NAMES = {
 
 const RE_VHDI = /^vhdi(\d+)$/
 
+async function addDirectory (zip, realPath, metadataPath) {
+  try {
+    const files = await readdir(realPath)
+    await Promise.all(
+      files.map(file =>
+        addDirectory(zip, realPath + '/' + file, metadataPath + '/' + file)
+      )
+    )
+  } catch (error) {
+    if (error == null || error.code !== 'ENOTDIR') {
+      throw error
+    }
+    zip.addFile(realPath, metadataPath)
+  }
+}
+
 const parsePartxLine = createPairsParser({
   keyTransform: key => (key === 'UUID' ? 'id' : key.toLowerCase()),
   valueTransform: (value, key) =>
     key === 'start' || key === 'size'
       ? +value
-      : key === 'type' ? PARTITION_TYPE_NAMES[+value] || value : value,
+      : key === 'type'
+        ? PARTITION_TYPE_NAMES[+value] || value
+        : value,
 })
 
 const listLvmLogicalVolumes = defer(
@@ -163,7 +181,11 @@ export default class BackupNgFileRestore {
 
     const zip = new ZipFile()
     paths.forEach(file => {
-      zip.addFile(resolveSubpath(partition.path, file), normalize('./' + file))
+      addDirectory(
+        zip,
+        resolveSubpath(partition.path, file),
+        normalize('./' + file)
+      )
     })
     zip.end()
     return zip.outputStream.on('end', () =>