Config - improve lock message for option phabricator.uninstalled-applications

Summary: Fixes T6175. This particular option is only editable via the Applications application so let the user know that.

Test Plan: saw error message and clicked through to applications app. tried another locked option and saw old message

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T6175

Differential Revision: https://secure.phabricator.com/D10841

src/applications/config/controller/PhabricatorConfigEditController.php

@@ -120,10 +120,8 @@ final class PhabricatorConfigEditController
         ->setSeverity(AphrontErrorView::SEVERITY_WARNING)
         ->appendChild(phutil_tag('p', array(), $msg));
     } else if ($option->getLocked()) {
-      $msg = pht(
-        'This configuration is locked and can not be edited from the web '.
-        'interface. Use `./bin/config` in `phabricator/` to edit it.');
 
+      $msg = $option->getLockedMessage();
       $error_view = id(new AphrontErrorView())
         ->setTitle(pht('Configuration Locked'))
         ->setSeverity(AphrontErrorView::SEVERITY_NOTICE)

src/applications/config/option/PhabricatorConfigOption.php

@@ -14,6 +14,7 @@ final class PhabricatorConfigOption
   private $group;
   private $examples;
   private $locked;
+  private $lockedMessage;
   private $hidden;
   private $masked;
   private $baseClass;
@@ -85,6 +86,20 @@ final class PhabricatorConfigOption
       false);
   }
 
+  public function setLockedMessage($message) {
+    $this->lockedMessage = $message;
+    return $this;
+  }
+
+  public function getLockedMessage() {
+    if ($this->lockedMessage !== null) {
+      return $this->lockedMessage;
+    }
+    return pht(
+      'This configuration is locked and can not be edited from the web '.
+      'interface. Use `./bin/config` in `phabricator/` to edit it.');
+  }
+
   public function addExample($value, $description) {
     $this->examples[] = array($value, $description);
     return $this;

src/applications/config/option/PhabricatorCoreConfigOptions.php

@@ -27,6 +27,7 @@ final class PhabricatorCoreConfigOptions
     $proto_doc_href = PhabricatorEnv::getDoclink(
       'User Guide: Prototype Applications');
     $proto_doc_name = pht('User Guide: Prototype Applications');
+    $applications_app_href = '/applications/';
 
     return array(
       $this->newOption('phabricator.base-uri', 'string', null)
@@ -183,6 +184,14 @@ final class PhabricatorCoreConfigOptions
         ->setDescription(pht('Unit test value.')),
       $this->newOption('phabricator.uninstalled-applications', 'set', array())
         ->setLocked(true)
+        ->setLockedMessage(pht(
+          'Use the %s to manage installed applications.',
+          phutil_tag(
+            'a',
+            array(
+              'href' => $applications_app_href,
+            ),
+            pht('Applications application'))))
         ->setDescription(
           pht('Array containing list of Uninstalled applications.')),
       $this->newOption('phabricator.application-settings', 'wild', array())