Read default values of custom config options

Summary: Because the Default configuration provider is loaded before custom libraries, any config options specified in them don't get a default values.

Test Plan: Looked at /config/

Reviewers: epriestley, codeblock, btrahan

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4532

src/applications/config/option/PhabricatorApplicationConfigOptions.php

@@ -132,7 +132,7 @@ abstract class PhabricatorApplicationConfigOptions extends Phobject {
       ->setGroup($this);
   }
 
-  final public static function loadAll() {
+  final public static function loadAll($external_only = false) {
     $symbols = id(new PhutilSymbolLoader())
       ->setAncestorClass('PhabricatorApplicationConfigOptions')
       ->setConcreteOnly(true)
@@ -140,6 +140,10 @@ abstract class PhabricatorApplicationConfigOptions extends Phobject {
 
     $groups = array();
     foreach ($symbols as $symbol) {
+      if ($external_only && $symbol['library'] == 'phabricator') {
+        continue;
+      }
+
       $obj = newv($symbol['name'], array());
       $key = $obj->getKey();
       if (isset($groups[$key])) {
@@ -156,8 +160,8 @@ abstract class PhabricatorApplicationConfigOptions extends Phobject {
     return $groups;
   }
 
-  final public static function loadAllOptions() {
-    $groups = self::loadAll();
+  final public static function loadAllOptions($external_only = false) {
+    $groups = self::loadAll($external_only);
 
     $options = array();
     foreach ($groups as $group) {

src/infrastructure/env/PhabricatorConfigDefaultSource.php

@@ -13,4 +13,10 @@ final class PhabricatorConfigDefaultSource
     $this->setSource(new PhabricatorConfigDictionarySource($options));
   }
 
+  public function loadExternalOptions() {
+    $options = PhabricatorApplicationConfigOptions::loadAllOptions(true);
+    $options = mpull($options, 'getDefault');
+    $this->setKeys($options);
+  }
+
 }

src/infrastructure/env/PhabricatorEnv.php

@@ -132,9 +132,9 @@ final class PhabricatorEnv {
     $stack = new PhabricatorConfigStackSource();
     self::$sourceStack = $stack;
 
-    $stack->pushSource(
-      id(new PhabricatorConfigDefaultSource())
-        ->setName(pht('Global Default')));
+    $defaultSource = id(new PhabricatorConfigDefaultSource())
+      ->setName(pht('Global Default'));
+    $stack->pushSource($defaultSource);
 
     $env = self::getSelectedEnvironmentName();
     $stack->pushSource(
@@ -152,6 +152,11 @@ final class PhabricatorEnv {
       phutil_load_library($library);
     }
 
+    // If custom libraries specify config options, they won't get default
+    // values as the Default source has already been loaded, so we get it to
+    // pull in all options from non-phabricator libraries now they are loaded.
+    $defaultSource->loadExternalOptions();
+
     try {
       $stack->pushSource(
         id(new PhabricatorConfigDatabaseSource('default'))