Pass over a notes ref that names no tree

A pusher can point refs/notes/commits or a signature notes ref at any
object, and git dies loading one that is no tree, which ended every page
of the repository, the dumb transport included. Such a ref now counts
as absent.

1 file changed, 9 insertions, 0 deletions

diff --git a/source/shared.c b/source/shared.cindex 0bd9fe3..a20773b 100644--- a/source/shared.c+++ b/source/shared.c@@ -756,3 +756,12 @@ int cgit_readme_is_tracked(const char *readme)  	return colon && colon[1]; }++int cgit_notes_ref_usable(const char *notes_ref)+{+	struct object_id oid;++	if (repo_get_oid_treeish(the_repository, notes_ref, &oid))+		return 0;+	return !!parse_tree_indirect(&oid);+}
diff --git a/source/shared.c b/source/shared.c
index 0bd9fe3..a20773b 100644
--- a/source/shared.c
+++ b/source/shared.c
@@ -756,3 +756,12 @@ int cgit_readme_is_tracked(const char *readme)
 
 	return colon && colon[1];
 }
+
+int cgit_notes_ref_usable(const char *notes_ref)
+{
+	struct object_id oid;
+
+	if (repo_get_oid_treeish(the_repository, notes_ref, &oid))
+		return 0;
+	return !!parse_tree_indirect(&oid);
+}