remove polling and improve update-check and auto-update. Fixes #695

src/rockstor/storageadmin/static/storageadmin/js/templates/update/version_info.jst

@@ -26,10 +26,10 @@
   <p>Rockstor is up-to-date. If you've updated recently, reload the browser<b>(Ctrl+Shift+R)</b> for latest UI changes.</p><br>
 
   <% if (autoUpdateEnabled) { %>
-  <p>Rockstor is configured to check for updates once a day and automatically update itself. If you so choose, you can disable auto update.</p>
+  <p>Rockstor is configured to check for package updates and automatically upgrade on a daily basis. This will keep your system up to date. While it's not recommended, you can disable this feature and only update when you want to.</p>
   <a id="disableAuto" class="btn btn-primary" title="Disable Auto Update">Disable auto update</a>
   <% } else { %>
-  <p>Rockstor can be configured to check for updates once a day and automatically update itself. We recommend you enable auto update.</p>
+  <p>Rockstor can be configured to check for package updates and automatically upgrade on a daily basis. We recommend you enable this feature to keep your system up to date without delay.</p>
   <a id="enableAuto" class="btn btn-primary" title="Enable Auto Update">Enable auto update</a>
   <% } %>
 <% } %>
@@ -39,7 +39,7 @@
     <div class="modal-content">
       <div class="modal-header">
         <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
-	<h4>RockStor is being updated to the latest version. Please wait... &nbsp;&nbsp; </h4>	
+	<h4>RockStor is being updated to the latest version. Please wait... &nbsp;&nbsp; </h4>
       </div>
       <div class="modal-body">
 	<div style="text-align: center">

src/rockstor/storageadmin/views/command.py

@@ -44,7 +44,7 @@
 from django.db import transaction
 from share_helpers import sftp_snap_toggle
 from oauth2_provider.ext.rest_framework import OAuth2Authentication
-from system.pkg_mgmt import install_pkg
+from system.pkg_mgmt import auto_update
 import logging
 logger = logging.getLogger(__name__)
 
@@ -217,27 +217,21 @@ def post(self, request, command):
 
         if (command == 'enable-auto-update'):
             try:
-                install_pkg('yum-cron')
-                systemctl('yum-cron', 'enable')
-                systemctl('yum-cron', 'start')
+                auto_update(enable=True)
+                return Response({'enabled': True, })
             except Exception, e:
-                msg = ('Failed to enable auto update due to a low level error')
-                logger.exception(e)
+                msg = ('Failed to enable auto update due to this exception: '
+                       '%s' % e.__str__())
                 handle_exception(Exception(msg), request)
-            finally:
-                return Response({'enabled': True, })
 
         if (command == 'disable-auto-update'):
             try:
-                systemctl('yum-cron', 'stop')
-                systemctl('yum-cron', 'disable')
+                auto_update(enable=False)
+                return Response({'enabled': False, })
             except Exception, e:
-                msg = ('Failed to disable auto update due to a low level '
-                       'error')
-                logger.exception(e)
+                msg = ('Failed to disable auto update due to this exception:  '
+                       '%s' % e.__str__())
                 handle_exception(Exception(msg), request)
-            finally:
-                return Response({'enabled': False, })
 
         if (command == 'refresh-pool-state'):
             for p in Pool.objects.all():

src/rockstor/system/pkg_mgmt.py

@@ -16,11 +16,42 @@
 along with this program. If not, see <http://www.gnu.org/licenses/>.
 """
 
+import os
+import re
+from tempfile import mkstemp
+from shutil import move
 from osi import run_command
-
+from services import systemctl
+import shutil
 
 YUM = '/usr/bin/yum'
 
 
 def install_pkg(name):
     return run_command([YUM, '--setopt=timeout=600', '-y', 'install', name])
+
+def auto_update(enable=True):
+    cfile = '/etc/yum/yum-cron.conf'
+    service = 'yum-cron'
+    fo, npath = mkstemp()
+    updated = False
+    with open(cfile) as ifo, open(npath, 'w') as tfo:
+        for line in ifo.readlines():
+            if (re.match('apply_updates = ', line) is not None):
+                if (enable):
+                    tfo.write('apply_updates = yes\n')
+                else:
+                    tfo.write('apply_updates = no\n')
+                updated = True
+            else:
+                tfo.write(line)
+    if (not updated):
+        raise Exception('apply_updates directive missing in %s, assuming its '
+                        'is corrupt. No change made.' % cfile)
+    shutil.move(npath, cfile)
+    if (enable):
+        systemctl(service, 'enable')
+        systemctl(service, 'start')
+    else:
+        systemctl(service, 'stop')
+        systemctl(service, 'disable')