fix python-crontab issue

ee/core/cron.py

@@ -4,21 +4,22 @@ from ee.core.logging import Log
 
 """
 Set CRON on LINUX system.
-https://pypi.python.org/pypi/python-crontab
 """
 
 class EECron():
     def setcron_daily(self,cmd,comment='Cron set by EasyEngine',user='root',min=0,hour=12):
         if not EEShellExec.cmd_exec(self, "crontab -l | grep -q \'{0}\'".format(cmd)):
-            tab = CronTab(user=user)
-            cron_job = tab.new(cmd, comment=comment)
-            cron_job.minute.on(min)
-            cron_job.hour.on(hour)
-            #writes to crontab
-            tab.write()
-            Log.debug(self, "Cron is set:\n" + tab.render())
-        else:
-            Log.debug(self, "Cron already exist")
+            #0 12 * * * ee site update phpbreddddcamp.net --le=renew --min_expiry_limit 30 2> /dev/null # Renew letsencrypt SSL cert. Set by EasyEngine
+
+            EEShellExec.cmd_exec(self, "/bin/bash -c \"crontab -l "
+                                             "2> /dev/null | {{ cat; echo -e"
+                                             " \\\""
+                                             "\\n*/0 12 * * * "
+                                             "{0}".format(cmd) +
+                                             " # {0}".format(comment)+
+                                             "\\\"; }} | crontab -\"")
+            Log.debug(self, "Cron set")
+
 
 
     def remove_cron(self,cmd):