format-patch: check that header line has expected format

diff --git a/sha1_file.c b/sha1_file.c
index 3d56746a9be12e78c2b5262948bd411acf3230a2..a54deb0558f0809e0ee98d96c9b4e1797b698fd0 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -36,6 +36,7 @@
 static inline uintmax_t sz_fmt(size_t s) { return s; }
 
 const unsigned char null_sha1[20];
+const struct object_id null_oid;
 
 /*
  * This is meant to hold a *small* number of objects that you would
@@ -3216,6 +3217,11 @@ int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
        return find_pack_entry(sha1, &e);
 }
 
+int has_object_file(const struct object_id *oid)
+{
+       return has_sha1_file(oid->hash);
+}
+
 static void check_tree(const void *buf, size_t size)
 {
        struct tree_desc desc;