Only load refs that are actual commits

Summary: Fix T11301. Git is git.

Test Plan: tagged a file! run discover. no crash.

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin

Maniphest Tasks: T11301

Differential Revision: https://secure.phabricator.com/D16261

src/applications/repository/engine/PhabricatorRepositoryDiscoveryEngine.php

@@ -174,12 +174,13 @@ final class PhabricatorRepositoryDiscoveryEngine
         continue;
       }
 
-      // In Git, it's possible to tag a tag. We just skip these, we'll discover
+      // In Git, it's possible to tag anything. We just skip tags that don't
-      // them when we process the target tag. See T11180.
+      // point to a commit. See T11301.
       $fields = $ref->getRawFields();
+      $ref_type = idx($fields, 'objecttype');
       $tag_type = idx($fields, '*objecttype');
-      if ($tag_type == 'tag') {
+      if ($ref_type != 'commit' && $tag_type != 'commit') {
-        $this->log(pht('Skipping, this is a tag of a tag.'));
+        $this->log(pht('Skipping, this is not a commit.'));
         continue;
       }
 

src/applications/repository/engine/__tests__/PhabricatorWorkingCopyDiscoveryTestCase.php

@@ -30,6 +30,7 @@ final class PhabricatorWorkingCopyDiscoveryTestCase
     $this->assertEqual(
       array(
         '763d4ab372445551c95fb5cccd1a7a223f5b2ac8',
+        '41fa35914aa19c1aa6e57004d9745c05929c3563',
       ),
       mpull($refs, 'getIdentifier'));
   }