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diff --git a/src/applications/project/query/PhabricatorProjectQuery.php b/src/applications/project/query/PhabricatorProjectQuery.php
--- a/src/applications/project/query/PhabricatorProjectQuery.php
+++ b/src/applications/project/query/PhabricatorProjectQuery.php
@@ -271,6 +271,25 @@
$all_graph = $this->getAllReachableAncestors($projects);
+ // See T13484. If the graph is damaged (and contains a cycle or an edge
+ // pointing at a project which has been destroyed), some of the nodes we
+ // started with may be filtered out by reachability tests. If any of the
+ // projects we are linking up don't have available ancestors, filter them
+ // out.
+
+ foreach ($projects as $key => $project) {
+ $project_phid = $project->getPHID();
+ if (!isset($all_graph[$project_phid])) {
+ $this->didRejectResult($project);
+ unset($projects[$key]);
+ continue;
+ }
+ }
+
+ if (!$projects) {
+ return array();
+ }
+
// NOTE: Although we may not need much information about ancestors, we
// always need to test if the viewer is a member, because we will return
// ancestor projects to the policy filter via ExtendedPolicy calls. If
diff --git a/src/infrastructure/edges/query/PhabricatorEdgeQuery.php b/src/infrastructure/edges/query/PhabricatorEdgeQuery.php
--- a/src/infrastructure/edges/query/PhabricatorEdgeQuery.php
+++ b/src/infrastructure/edges/query/PhabricatorEdgeQuery.php
@@ -46,6 +46,13 @@
* @task config
*/
public function withSourcePHIDs(array $source_phids) {
+ if (!$source_phids) {
+ throw new Exception(
+ pht(
+ 'Edge list passed to "withSourcePHIDs(...)" is empty, but it must '.
+ 'be nonempty.'));
+ }
+
$this->sourcePHIDs = $source_phids;
return $this;
}
@@ -158,11 +165,10 @@
* @task exec
*/
public function execute() {
- if (!$this->sourcePHIDs) {
+ if ($this->sourcePHIDs === null) {
throw new Exception(
pht(
- 'You must use %s to query edges.',
- 'withSourcePHIDs()'));
+ 'You must use "withSourcePHIDs()" to query edges.'));
}
$sources = phid_group_by_type($this->sourcePHIDs);

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