Fix so update.sh script warns about changed defaults (#7011)

CHANGELOG

@@ -8,6 +8,7 @@ CHANGELOG Roundcube Webmail
 - Fix invalid Signature button state after escaping Mailvelope mode (#7015)
 - Fix so 401 error is returned only on failed logon requests (#7010)
 - Fix db_prefix handling in queries with `TRUNCATE TABLE <name>` and `UNIQUE <name>` (#7013)
+- Fix so update.sh script warns about changed defaults (#7011)
 
 RELEASE 1.4.0
 -------------

bin/update.sh

@@ -43,7 +43,7 @@ $RCI->load_config();
 if ($RCI->configured) {
     $success = true;
 
-    if (($messages = $RCI->check_config()) || $RCI->legacy_config) {
+    if (($messages = $RCI->check_config($opts['version'])) || $RCI->legacy_config) {
         $success = false;
         $err = 0;
 
@@ -56,8 +56,6 @@ if ($RCI->configured) {
                 echo "- '" . $msg['prop'] . "' was replaced by '" . $msg['replacement'] . "'\n";
                 $err++;
             }
-
-            echo "\n";
         }
 
         // list obsolete config options (just a notice)
@@ -70,8 +68,6 @@ if ($RCI->configured) {
                 echo "- '" . $msg['prop'] . ($msg['name'] ? "': " . $msg['name'] : "'") . "\n";
                 $err++;
             }
-
-            echo "\n";
         }
 
         if (!$err && $RCI->legacy_config) {
@@ -137,6 +133,15 @@ if ($RCI->configured) {
             }
         }
 
+        // list of config options with changed default (just a notice)
+        if (!empty($messages['defaults'])) {
+            echo "WARNING: Changed defaults (These config options have new default values):\n";
+
+            foreach ($messages['defaults'] as $opt) {
+                echo "- '{$opt}'\n";
+            }
+        }
+
         // check dependencies based on the current configuration
         if (is_array($messages['dependencies'])) {
             echo "WARNING: Dependency check failed!\n";

program/include/rcmail_install.php

@@ -61,6 +61,10 @@ class rcmail_install
         'Oracle'              => 'oci8',
     );
 
+    /** @var array List of config options with default value change per-release */
+    public $defaults_changes = array(
+        '1.4.0' => array('skin', 'smtp_port', 'smto_user', 'smtp_pass'),
+    );
 
     /**
      * Constructor
@@ -298,9 +302,11 @@ class rcmail_install
      * Check the current configuration for missing properties
      * and deprecated or obsolete settings
      *
+     * @param string $version Previous version on upgrade
+     *
      * @return array List with problems detected
      */
-    public function check_config()
+    public function check_config($version = null)
     {
         $this->load_config();
 
@@ -379,6 +385,18 @@ class rcmail_install
             }
         }
 
+        if ($version) {
+            $out['defaults'] = array();
+
+            foreach ($this->defaults_changes as $v => $opts) {
+                if (version_compare($v, $version, '>')) {
+                    $out['defaults'] = array_merge($out['defaults'], $opts);
+                }
+            }
+
+            $out['defaults'] = array_unique($out['defaults']);
+        }
+
         return $out;
     }