t / t5100 / info0001on commit use strbuf_add_unique_abbrev() for adding short hashes (1eb47f1)
   1Author: A (zzz) U Thor (Comment)
   2Email: a.u.thor@example.com
   3Subject: a commit.
   4Date: Fri, 9 Jun 2006 00:44:16 -0700
   5