mail: fix rebuild

also fixes dangerous code that downloads mail backup if infra version is 'none'

src/cloudron.js

@@ -10,6 +10,7 @@ exports = module.exports = {
     isRebootRequired,
 
     onActivated,
+    onRestored,
 
     setupDnsAndCert,
 
@@ -27,6 +28,7 @@ const apps = require('./apps.js'),
     assert = require('assert'),
     AuditSource = require('./auditsource.js'),
     backups = require('./backups.js'),
+    backuptask = require('./backuptask.js'),
     BoxError = require('./boxerror.js'),
     branding = require('./branding.js'),
     constants = require('./constants.js'),
@@ -83,6 +85,24 @@ async function onActivated(options) {
     await reverseProxy.writeDefaultConfig({ activated :true });
 }
 
+async function onRestored(options) {
+    assert.strictEqual(typeof options, 'object');
+
+    debug('onRestored: downloading mail');
+
+    const [error, results] = await safe(backups.getByIdentifierAndStatePaged(backups.BACKUP_IDENTIFIER_MAIL, backups.BACKUP_STATE_NORMAL, 1, 1));
+    if (error || results.length == 0) {
+        debug('startMail: could not find backup to restore', error, results);
+    } else {
+        debug(`startMail: downloading backup ${results[0].id}`);
+        const restoreConfig = { backupId: results[0].id, backupFormat: results[0].format };
+        // have to wait for download before starting mail container because we download as non-root user
+        await backuptask.downloadMail(restoreConfig, (progress) => debug(`startMail: ${progress.message}`));
+    }
+
+    await onActivated(options);
+}
+
 async function notifyUpdate() {
     const version = safe.fs.readFileSync(paths.VERSION_FILE, 'utf8');
     if (version === constants.VERSION) return;