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diff --git a/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php b/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
--- a/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
+++ b/src/applications/diffusion/conduit/DiffusionBrowseQueryConduitAPIMethod.php
@@ -52,6 +52,36 @@
$commit,
$path);
} catch (CommandException $e) {
+ // The "cat-file" command may fail if the path legitimately does not
+ // exist, but it may also fail if the path is a submodule. This can
+ // produce either "Not a valid object name" or "could not get object
+ // info".
+
+ // To detect if we have a submodule, use `git ls-tree`. If the path
+ // is a submodule, we'll get a "160000" mode mask with type "commit".
+
+ list($sub_err, $sub_stdout) = $repository->execLocalCommand(
+ 'ls-tree %s -- %s',
+ $commit,
+ $path);
+ if (!$sub_err) {
+ // If the path failed "cat-file" but "ls-tree" worked, we assume it
+ // must be a submodule. If it is, the output will look something
+ // like this:
+ //
+ // 160000 commit <hash> <path>
+ //
+ // We make sure it has the 160000 mode mask to confirm that it's
+ // definitely a submodule.
+ $mode = (int)$sub_stdout;
+ if ($mode & 160000) {
+ $submodule_reason = DiffusionBrowseResultSet::REASON_IS_SUBMODULE;
+ $result
+ ->setReasonForEmptyResultSet($submodule_reason);
+ return $result;
+ }
+ }
+
$stderr = $e->getStderr();
if (preg_match('/^fatal: Not a valid object name/', $stderr)) {
// Grab two logs, since the first one is when the object was deleted.
diff --git a/src/applications/diffusion/data/DiffusionBrowseResultSet.php b/src/applications/diffusion/data/DiffusionBrowseResultSet.php
--- a/src/applications/diffusion/data/DiffusionBrowseResultSet.php
+++ b/src/applications/diffusion/data/DiffusionBrowseResultSet.php
@@ -3,6 +3,7 @@
final class DiffusionBrowseResultSet extends Phobject {
const REASON_IS_FILE = 'is-file';
+ const REASON_IS_SUBMODULE = 'is-submodule';
const REASON_IS_DELETED = 'is-deleted';
const REASON_IS_NONEXISTENT = 'nonexistent';
const REASON_BAD_COMMIT = 'bad-commit';
diff --git a/src/applications/diffusion/view/DiffusionEmptyResultView.php b/src/applications/diffusion/view/DiffusionEmptyResultView.php
--- a/src/applications/diffusion/view/DiffusionEmptyResultView.php
+++ b/src/applications/diffusion/view/DiffusionEmptyResultView.php
@@ -40,6 +40,13 @@
$body = pht('This path was an empty directory at %s.', $commit);
$severity = PHUIInfoView::SEVERITY_NOTICE;
break;
+ case DiffusionBrowseResultSet::REASON_IS_SUBMODULE:
+ $title = pht('Submodule');
+ // TODO: We could improve this, but it is normally difficult to
+ // reach this page for a submodule.
+ $body = pht('This path was a submodule at %s.', $commit);
+ $severity = PHUIInfoView::SEVERITY_NOTICE;
+ break;
case DiffusionBrowseResultSet::REASON_IS_DELETED:
$deleted = $this->browseResultSet->getDeletedAtCommit();
$existed = $this->browseResultSet->getExistedAtCommit();

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