From 45962a179c0c26a939578dee2123e480fe873b00 Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Sat, 10 Mar 2012 09:40:42 +0100
Subject: [PATCH 1/2] MDL-31595 do not show enrolee link to guest account

---
 lib/enrollib.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/enrollib.php b/lib/enrollib.php
index 62e791ae2e5..4072905eab1 100644
--- a/lib/enrollib.php
+++ b/lib/enrollib.php
@@ -477,7 +477,9 @@ function enrol_add_course_navigation(navigation_node $coursenode, $course) {
 
     if ($course->id != SITEID) {
         // Unenrol link
-        if (is_enrolled($coursecontext)) {
+        if (isguestuser() or !isloggedin()) {
+            // guest account can not be enrolled
+        } else if (is_enrolled($coursecontext)) {
             foreach ($instances as $instance) {
                 if (!isset($plugins[$instance->enrol])) {
                     continue;

From 1b75985a391d9acee2aa2554923ed1daf0a14c22 Mon Sep 17 00:00:00 2001
From: Petr Skoda <commits@skodak.org>
Date: Mon, 12 Mar 2012 16:47:28 +0100
Subject: [PATCH 2/2] MDL-31595 improve enrol link comments

---
 lib/enrollib.php | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/enrollib.php b/lib/enrollib.php
index 4072905eab1..7fd29e68f08 100644
--- a/lib/enrollib.php
+++ b/lib/enrollib.php
@@ -476,10 +476,10 @@ function enrol_add_course_navigation(navigation_node $coursenode, $course) {
     $usersnode->trim_if_empty();
 
     if ($course->id != SITEID) {
-        // Unenrol link
         if (isguestuser() or !isloggedin()) {
-            // guest account can not be enrolled
+            // guest account can not be enrolled - no links for them
         } else if (is_enrolled($coursecontext)) {
+            // unenrol link if possible
             foreach ($instances as $instance) {
                 if (!isset($plugins[$instance->enrol])) {
                     continue;
@@ -493,6 +493,7 @@ function enrol_add_course_navigation(navigation_node $coursenode, $course) {
                 }
             }
         } else {
+            // enrol link if possible
             if (is_viewing($coursecontext)) {
                 // better not show any enrol link, this is intended for managers and inspectors
             } else {