"log", "-n1", "--format=%H").CombinedOutput()
c.Logf("git-log in workdir: %q", string(sha1))
c.Assert(err, check.Equals, nil)
c.Assert(len(sha1), check.Equals, 41)
"log", "-n1", "--format=%H").CombinedOutput()
c.Logf("git-log in workdir: %q", string(sha1))
c.Assert(err, check.Equals, nil)
c.Assert(len(sha1), check.Equals, 41)