Add remount route for mountlike backup storages

src/storage/filesystem.js

@@ -15,6 +15,8 @@ exports = module.exports = {
     remove,
     removeDir,
 
+    remount,
+
     testConfig,
     removePrivateFields,
     injectPrivateFields
@@ -35,6 +37,7 @@ const assert = require('assert'),
     df = require('@sindresorhus/df'),
     EventEmitter = require('events'),
     fs = require('fs'),
+    mounts = require('../mounts.js'),
     path = require('path'),
     paths = require('../paths.js'),
     prettyBytes = require('pretty-bytes'),
@@ -281,6 +284,14 @@ function validateBackupTarget(folder) {
     return null;
 }
 
+async function remount(apiConfig) {
+    assert.strictEqual(typeof apiConfig, 'object');
+
+    if (apiConfig.provider === PROVIDER_FILESYSTEM || apiConfig.provider === PROVIDER_MOUNTPOINT) throw new BoxError(BoxError.NOT_SUPPORTED);
+
+    await mounts.remount(mounts.mountObjectFromBackupConfig(apiConfig));
+}
+
 function testConfig(apiConfig, callback) {
     assert.strictEqual(typeof apiConfig, 'object');
     assert.strictEqual(typeof callback, 'function');