MDL-35238 Be more verbose if the tilde character is used in TYPE_PATH…

… script options

The tilde character is not generally supported in Moodle. Previously it
was just removed silently and it was difficult to realize what was going
on.

mdeploy.php

@@ -258,6 +258,9 @@ public function cast_value($raw, $type) {
                 return (int)$raw;
 
             case input_manager::TYPE_PATH:
+                if (strpos($raw, '~') !== false) {
+                    throw new invalid_option_exception('Using the tilde (~) character in paths is not supported');
+                }
                 $raw = str_replace('\\', '/', $raw);
                 $raw = preg_replace('~[[:cntrl:]]|[&<>"`\|\':]~u', '', $raw);
                 $raw = preg_replace('~\.\.+~', '', $raw);

mdeploytest.php

@@ -174,6 +174,15 @@ public function test_cast_invalid_md5_value() {
         $input->cast_value($invalid, input_manager::TYPE_MD5); // must throw exception
     }
 
+    /**
+     * @expectedException invalid_option_exception
+     */
+    public function test_cast_tilde_in_path() {
+        $input = testable_input_manager::instance();
+        $invalid = '~/public_html/moodle_dev';
+        $input->cast_value($invalid, input_manager::TYPE_PATH); // must throw exception
+    }
+
     public function test_has_option() {
         $provider = input_fake_provider::instance();