Added isSymlink logic to determine if Grav is symbolically linked or not.

admin.php

@@ -270,7 +270,8 @@ class AdminPlugin extends Plugin
                         "assets"      => $gpm->grav->getAssets(),
                         "version"     => GRAV_VERSION,
                         "available"   => $gpm->grav->getVersion(),
-                        "date"        => $gpm->grav->getDate()
+                        "date"        => $gpm->grav->getDate(),
+                        "isSymlink"   => $gpm->grav->isSymlink()
                     ];
 
                     echo json_encode([

classes/controller.php

@@ -4,6 +4,7 @@ namespace Grav\Plugin;
 use Grav\Common\Cache;
 use Grav\Common\Config\Config;
 use Grav\Common\Filesystem\Folder;
+use Grav\Common\GPM\Installer;
 use Grav\Common\Grav;
 use Grav\Common\Themes;
 use Grav\Common\Uri;
@@ -705,17 +706,12 @@ class AdminController
             return;
         }
 
-        if (is_link(ROOT_DIR . 'index.php')) {
-            $this->admin->json_response = ['status' => 'error', 'message' => 'Cannot upgrade: Grav is symlinked. Please upgrade manually'];
-            return false;
-        }
-
         $result = \Grav\Plugin\Admin\Gpm::selfupgrade();
 
         if ($result) {
             $this->admin->json_response = ['status' => 'success', 'message' => 'Grav was successfully updated to '];
         } else {
-            $this->admin->json_response = ['status' => 'error', 'message' => 'Grav update failed'];
+            $this->admin->json_response = ['status' => 'error', 'message' => 'Grav update failed <br>' . Installer::lastErrorMsg()];
         }
 
         return true;

classes/gpm.php

@@ -168,6 +168,16 @@ class Gpm
 
     public static function selfupgrade() {
         $upgrader = new Upgrader();
+
+        if (!Installer::isGravInstance(GRAV_ROOT)) {
+            return false;
+        }
+
+        if (is_link(GRAV_ROOT . DS . 'index.php')) {
+            Installer::setError(Installer::IS_LINK);
+            return false;
+        }
+
         $update = $upgrader->getAssets()['grav-update'];
         $tmp = CACHE_DIR . 'tmp/Grav-' . uniqid();
         $file = self::_downloadSelfupgrade($update, $tmp);

themes/grav/js/admin-all.js

@@ -10,6 +10,13 @@ var getState = function(){
     return loadValues.toString();
 };
 
+var bytesToSize = function(bytes) {
+    var sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
+    if (bytes == 0) return '0 Byte';
+    var i = parseInt(Math.floor(Math.log(bytes) / Math.log(1024)));
+    return Math.round(bytes / Math.pow(1024, i), 2) + ' ' + sizes[i];
+};
+
 $(function () {
     jQuery.substitute = function(str, sub) {
         return str.replace(/\{(.+?)\}/g, function($0, $1) {
@@ -239,13 +246,17 @@ $(function () {
                         content = 'Grav <b>v{available}</b> is now available! <span class="less">(Current: v{version})</span> ',
                         button  = '<button data-maintenance-update="' + GravAdmin.config.base_url_relative + '/update.json/task:updategrav" class="button button-small secondary" id="grav-update-button">Update Grav Now</button>';
 
+                    if (grav.isSymlink) {
+                        button = '<span class="hint--left" style="float: right;" data-hint="Grav is symbolically linked. Upgrade won\'t be available."><i class="fa fa-fw fa-link"></i></span>';
+                    }
+
                     content = jQuery.substitute(content, {available: grav.available, version: grav.version});
                     $('[data-gpm-grav]').addClass('grav').html('<p>' + icon + content + button + '</p>');
                     window.grav_available_version = grav.available;
                 }
 
                 $('#grav-update-button').on('click', function() {
-                    $(this).html('Updating... please wait, downloading 2MB+..');
+                    $(this).html('Updating... please wait, downloading ' + bytesToSize(grav.assets['grav-update'].size) + '..');
                 });
 
                 // dashboard