scheduler: suspend/resume jobs when apptask is active

the cron job container was holding on to the volume any container changes.

src/apptaskmanager.js

@@ -1,7 +1,7 @@
 'use strict';
 
 exports = module.exports = {
-    scheduleTask: scheduleTask
+    scheduleTask
 };
 
 let assert = require('assert'),
@@ -12,6 +12,7 @@ let assert = require('assert'),
     safe = require('safetydance'),
     path = require('path'),
     paths = require('./paths.js'),
+    scheduler = require('./scheduler.js'),
     sftp = require('./sftp.js'),
     tasks = require('./tasks.js');
 
@@ -69,6 +70,8 @@ function scheduleTask(appId, taskId, callback) {
 
     if (!fs.existsSync(path.dirname(logFile))) safe.fs.mkdirSync(path.dirname(logFile)); // ensure directory
 
+    scheduler.suspendJobs(appId);
+
     // TODO: set memory limit for app backup task
     tasks.startTask(taskId, { logFile, timeout: 20 * 60 * 60 * 1000 /* 20 hours */, nice: 15 }, function (error, result) {
         callback(error, result);
@@ -77,9 +80,8 @@ function scheduleTask(appId, taskId, callback) {
         locker.unlock(locker.OP_APPTASK); // unlock event will trigger next task
 
         // post app task hooks
-        sftp.rebuild(function (error) {
-            if (error) debug('Unable to rebuild sftp:', error);
-        });
+        sftp.rebuild(error => { if (error) debug('Unable to rebuild sftp:', error); });
+        scheduler.resumeJobs(appId);
     });
 }