$ git clone -n https://src.fedoraproject.org/rpms/elixir.git /var/lib/mock/f41-build-1190191-22180/root/chroot_tmpdir/scmroot/elixir
Cloning into '/var/lib/mock/f41-build-1190191-22180/root/chroot_tmpdir/scmroot/elixir'...
$ git fetch origin 4e31d75c02829cdf52bab60b8daf8dcd027b69da:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/elixir
 * [new ref]         4e31d75c02829cdf52bab60b8daf8dcd027b69da -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4e31d75 Add minimal README mentioning update policy