backups: move mount status to separate route

src/backups.js

@@ -27,6 +27,7 @@ exports = module.exports = {
     testProviderConfig,
 
     remount,
+    getMountStatus,
 
     BACKUP_IDENTIFIER_BOX: 'box',
     BACKUP_IDENTIFIER_MAIL: 'mail',
@@ -50,6 +51,7 @@ const assert = require('assert'),
     eventlog = require('./eventlog.js'),
     hat = require('./hat.js'),
     locker = require('./locker.js'),
+    mounts = require('./mounts.js'),
     path = require('path'),
     paths = require('./paths.js'),
     safe = require('safetydance'),
@@ -361,3 +363,18 @@ async function remount(auditSource) {
 
     await storage.api(backupConfig.provider).remount(backupConfig);
 }
+
+async function getMountStatus() {
+    const backupConfig = await settings.getBackupConfig();
+
+    let hostPath;
+    if (mounts.isManagedProvider(backupConfig.provider)) {
+        hostPath = paths.MANAGED_BACKUP_MOUNT_DIR;
+    } else if (backupConfig.provider === 'mountpoint') {
+        hostPath = backupConfig.mountPoint;
+    } else if (backupConfig.provider === 'filesystem') {
+        hostPath = backupConfig.backupFolder;
+    }
+
+    return await mounts.getStatus(backupConfig.provider, hostPath); // { state, message }
+}