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diff --git a/src/applications/repository/engine/PhabricatorRepositoryMirrorEngine.php b/src/applications/repository/engine/PhabricatorRepositoryMirrorEngine.php
--- a/src/applications/repository/engine/PhabricatorRepositoryMirrorEngine.php
+++ b/src/applications/repository/engine/PhabricatorRepositoryMirrorEngine.php
@@ -76,6 +76,20 @@
PhabricatorRepository $repository,
PhabricatorRepositoryURI $mirror_uri) {
+ // See T5965. Test if we have any refs to mirror. If we have nothing, git
+ // will exit with an error ("No refs in common and none specified; ...")
+ // when we run "git push --mirror".
+
+ // If we don't have any refs, we just bail out. (This is arguably sort of
+ // the wrong behavior: to mirror an empty repository faithfully we should
+ // delete everything in the remote.)
+
+ list($stdout) = $repository->execxLocalCommand(
+ 'for-each-ref --count 1 --');
+ if (!strlen($stdout)) {
+ return;
+ }
+
$argv = array(
'push --verbose --mirror -- %P',
$mirror_uri->getURIEnvelope(),
diff --git a/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php b/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
--- a/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
+++ b/src/applications/repository/engine/PhabricatorRepositoryPullEngine.php
@@ -399,6 +399,11 @@
'ls-remote %P',
$remote_envelope);
+ // Empty repositories don't have any refs.
+ if (!strlen(rtrim($stdout))) {
+ return array();
+ }
+
$map = array();
$lines = phutil_split_lines($stdout, false);
foreach ($lines as $line) {

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