t / t4013 / diff.diff_--no-index_--raw_--abbrev=4_dir2_diron commit sha1_file: convert check_sha1_signature to struct object_id (17e6545)
   1$ git diff --no-index --raw --abbrev=4 dir2 dir
   2:000000 100644 0000... 0000... A        dir/sub
   3$