move the reboot button, fix grammar, refactor check for DRY, add changelog entry

CHANGELOG.md

 CHANGELOG
 =========
 
+* When a reboot is required (due to Ubuntu security updates automatically installed), a Reboot Box button now appears.
+
 v0.17 (February 25, 2016)
 -------------------------
 

management/daemon.py

@@ -456,10 +456,12 @@ def do_updates():
 		"DEBIAN_FRONTEND": "noninteractive"
 	})
 
+
 @app.route('/system/reboot', methods=["GET"])
 @authorized_personnel_only
 def needs_reboot():
-	if os.path.isfile("/var/run/reboot-required"):
+	from status_checks import is_reboot_needed_due_to_package_installation
+	if is_reboot_needed_due_to_package_installation():
 		return json_response(True)
 	else:
 		return json_response(False)
@@ -467,10 +469,12 @@ def needs_reboot():
 @app.route('/system/reboot', methods=["POST"])
 @authorized_personnel_only
 def do_reboot():
-	if os.path.isfile("/var/run/reboot-required"):
+	# To keep the attack surface low, we don't allow a remote reboot if one isn't necessary.
+	from status_checks import is_reboot_needed_due_to_package_installation
+	if is_reboot_needed_due_to_package_installation():
 		return utils.shell("check_output", ["/sbin/shutdown", "-r", "now"], capture_stderr=True)
 	else:
-		return "No reboot is required"
+		return "No reboot is required, so it is not allowed."
 
 
 @app.route('/system/backup/status')

management/status_checks.py

@@ -185,10 +185,13 @@ def check_ssh_password(env, output):
 	else:
 		output.print_ok("SSH disallows password-based login.")
 
+def is_reboot_needed_due_to_package_installation():
+	return os.path.exists("/var/run/reboot-required")
+
 def check_software_updates(env, output):
 	# Check for any software package updates.
 	pkgs = list_apt_updates(apt_update=False)
-	if os.path.exists("/var/run/reboot-required"):
+	if is_reboot_needed_due_to_package_installation():
 		output.print_error("System updates have been installed and a reboot of the machine is required.")
 	elif len(pkgs) == 0:
 		output.print_ok("System software is up to date.")

management/templates/system-status.html

 <h2>System Status Checks</h2>
 
-<div id="system-reboot-required" style="display: none">
-  <button type="button" class="btn btn-danger" onclick="confirm_reboot(); return false;">Reboot required</button>
-</div>
-
 <style>
 #system-checks .heading td {
   font-weight: bold;
@@ -38,22 +34,24 @@
   font-family: monospace;
   white-space: pre-wrap;
 }
-#system-reboot-required {
-  max-width: 20em;
-  margin-bottom: 1em;
-}
-#system-privacy-setting {
-  float: right;
-  max-width: 20em;
-  margin-bottom: 1em;
-}
 </style>
 
+<div class="row">
+	<div class="col-md-push-9 col-md-3">
+
+<div id="system-reboot-required" style="display: none; margin-bottom: 1em;">
+	<button type="button" class="btn btn-danger" onclick="confirm_reboot(); return false;">Reboot Box</button>
+	<div>No reboot is necessary.</div>
+</div>
+
 <div id="system-privacy-setting" style="display: none">
 	<div><a onclick="return enable_privacy(!current_privacy_setting)" href="#"><span>Enable/Disable</span> New-Version Check</a></div>
 	<p style="line-height: 125%"><small>(When enabled, status checks phone-home to check for a new release of Mail-in-a-Box.)</small></p>
 </div>
 
+	</div> <!-- /col -->
+	<div class="col-md-pull-3 col-md-8">
+
 <table id="system-checks" class="table" style="max-width: 60em">
   <thead>
   </thead>
@@ -61,6 +59,9 @@
   </tbody>
 </table>
 
+	</div> <!-- /col -->
+</div> <!-- /row -->
+
 <script>
 function show_system_status() {
   $('#system-checks tbody').html("<tr><td colspan='2' class='text-muted'>Loading...</td></tr>")
@@ -81,7 +82,9 @@ function show_system_status() {
     "GET",
     { },
     function(r) {
-      $('#system-reboot-required').toggle(r);
+      $('#system-reboot-required').show(); // show when r becomes available
+      $('#system-reboot-required').find('button').toggle(r);
+      $('#system-reboot-required').find('div').toggle(!r);
     });
 
   api(
@@ -139,16 +142,18 @@ function enable_privacy(status) {
 
 function confirm_reboot() {
   show_modal_confirm(
-    "Reboot server",
-    $("<p>This will reboot your server, until the server is fully restarted your users will not be able to send and receive email. The reboot can't be cancelled</p>"),
-    "Reboot now",
+    "Reboot",
+    $("<p>This will reboot your Mail-in-a-Box <code>{{hostname}}</code>.</p> <p>Until the machine is fully restarted, your users will not be able to send and receive email, and you will not be able to connect to this control panel or with SSH. The reboot cannot be cancelled.</p>"),
+    "Reboot Now",
     function() {
       api(
         "/system/reboot",
         "POST",
         { },
         function(r) {
-          show_modal_error("Reboot", "Please refresh the page after a minute or so." + r);
+          var msg = "<p>Please reload this page after a minute or so.</p>";
+          if (r) msg = "<p>The reboot command said:</p> <pre>" + $("<pre/>").text(r).html() + "</pre>"; // successful reboots don't produce any output; the output must be HTML-escaped
+          show_modal_error("Reboot", msg);
         });
     });
 }