Move directory SQL patch construction to abstract base class

Summary:
Ref T6238. I'm building the instance management application now, but not putting it in the upstream -- I think the only use case for it is to build SAAS. If someone comes up with a use case (maybe a college course that wants to create an instance per-class or something?) we could open it up eventually, but it seems cleaner to keep it out of the upstream until we have such a use case.

I need to add schema patches. Make it easier for a subclass to just "add all the patches in this directory", like "autopatches/" works.

Test Plan:
  - Ran `bin/storage status`, saw all normal patches still valid.
  - In some future diff, the instances application will use this to apply patches.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T6238

Differential Revision: https://secure.phabricator.com/D10848

src/applications/base/controller/PhabricatorController.php

@@ -527,7 +527,7 @@ abstract class PhabricatorController extends AphrontController {
   }
 
   protected function buildTransactionTimeline(
-    PhabricatorLiskDAO $object,
+    PhabricatorApplicationTransactionInterface $object,
     PhabricatorApplicationTransactionQuery $query,
     PhabricatorMarkupEngine $engine = null) {
 

src/infrastructure/storage/patch/PhabricatorBuiltinPatchList.php

@@ -39,24 +39,7 @@ final class PhabricatorBuiltinPatchList extends PhabricatorSQLPatchList {
 
     $root = dirname(phutil_get_library_root('phabricator'));
     $auto_root = $root.'/resources/sql/autopatches/';
-    $auto_list = Filesystem::listDirectory($auto_root, $include_hidden = false);
-    sort($auto_list);
-
-    foreach ($auto_list as $auto_patch) {
-      $matches = null;
-      if (!preg_match('/\.(sql|php)$/', $auto_patch, $matches)) {
-        throw new Exception(
-          pht(
-            'Unknown patch "%s" in "%s", expected ".php" or ".sql" suffix.',
-            $auto_patch,
-            $auto_root));
-      }
-
-      $patches[$auto_patch] = array(
-        'type' => $matches[1],
-        'name' => $auto_root.$auto_patch,
-      );
-    }
+    $patches += $this->buildPatchesFromDirectory($auto_root);
 
     return $patches;
   }

src/infrastructure/storage/patch/PhabricatorSQLPatchList.php

@@ -5,6 +5,37 @@ abstract class PhabricatorSQLPatchList {
   abstract function getNamespace();
   abstract function getPatches();
 
+  /**
+   * Examine a directory for `.php` and `.sql` files and build patch
+   * specifications for them.
+   */
+  protected function buildPatchesFromDirectory($directory) {
+    $patch_list = Filesystem::listDirectory(
+      $directory,
+      $include_hidden = false);
+
+    sort($patch_list);
+    $patches = array();
+
+    foreach ($patch_list as $patch) {
+      $matches = null;
+      if (!preg_match('/\.(sql|php)$/', $patch, $matches)) {
+        throw new Exception(
+          pht(
+            'Unknown patch "%s" in "%s", expected ".php" or ".sql" suffix.',
+            $patch,
+            $directory));
+      }
+
+      $patches[$patch] = array(
+        'type' => $matches[1],
+        'name' => rtrim($directory, '/').'/'.$patch,
+      );
+    }
+
+    return $patches;
+  }
+
   final public static function buildAllPatches() {
     $patch_lists = id(new PhutilSymbolLoader())
       ->setAncestorClass('PhabricatorSQLPatchList')